Entries |
Document | Title | Date |
20080226091 | Plug, sound inputting and outputting apparatus, and noise cancel system - Herein disclosed a sound inputting and outputting apparatus for being connected to an external apparatus which includes a noise cancel signal production section, a storage section and a reproduction section, including: a first auricle mounting section; a second auricle mounting section; and a plug. | 09-18-2008 |
20080285767 | Method for the Estimation of a Useful Signal with the Aid of an Adaptive Process - Disclosed is an active noise detection system which is used in a room and utilizes at least one sensor unit for detecting the residual cumulative signal (e+g), one of the sensor units being used for detecting a useful signal (g). In order to make said useful signal (g) available at an improved quality, an additional adaptive process unit ( | 11-20-2008 |
20080304677 | SYSTEM AND METHOD FOR NOISE CANCELLATION WITH MOTION TRACKING CAPABILITY - A system and method for noise cancellation is disclosed herein generally having at least one microphone, a processor, and a speaker array. The processor may contain an adaptive filtering feature, to separate desirable sound from undesirable sound. The undesirable sound may be suppressed by the processor by creating a canceling waveform and transmitting the canceling waveform to the user's head via a speaker array. The desirable sound may be enhanced by increasing the amplitude of the waveform and transmitting the amplified waveform to the user's head via a speaker array. The sound transmitted to the user's head by the system may be localized using an image tracking subsystem and speaker array. The image tracking system may track the actual visible image or alternatively a heat (e.g. infrared) image of the user's head. | 12-11-2008 |
20090022332 | Enhanced Audio Recording For Smart Pen Computing Systems - In a pen-based computing system, a pair of microphones captures audio concurrently with a smart pen device capturing handwriting gestures. The audio captured by the pair of microphones is processed to produce an enhanced audio recording. Noise cancellation techniques may be applied to reduce noise generated by the smart pen device interacting with the writing surface to produce a higher quality audio recording. In addition, beam steering techniques may be applied to adjust the gain of portions of the audio signal from different directions and allow the user to focus between multiple audio sources. | 01-22-2009 |
20090034746 | CHASSIS WITH NOISE CANCELLATION FUNCTION, NOISE CANCELLATION METHOD, METHOD FOR PRODUCING NOISE CANCELLATION SOUND DATA, PROGRAM FOR PRODUCING NOISE CANCELLATION SOUND DATA, AND MEDIUM - A chassis with noise cancellation function which performs active noise cancellation in a first location for cancelling a noise generated in the chassis includes a sound receiving circuit receiving a surrounding sound in a second location, a memory circuit storing noise cancellation sound data and the surrounding sound that are associated with each other, a controller selecting the noise cancellation sound data corresponding to the surrounding sound received by the sound receiving circuit from the memory circuit and generating a noise cancellation signal based on the selected noise cancellation sound data and a sound output unit outputting a noise cancellation sound in said first location based on the noise cancellation signal to perform the active noise cancellation. | 02-05-2009 |
20090080669 | NOISE CANCEL METHOD, NOISE CANCEL TYPE AMPLIFYING CIRCUIT, AND RECEIVING CIRCUIT AND ELECTRONIC DEVICE INCLUDING NOISE CANCEL TYPE AMPLIFYING CIRCUIT - A noise cancel method includes: generating a cancel signal which cancels a noise signal based on the noise signal generated from a receiving unit for receiving a wireless signal; generating an amplification signal produced by amplifying a reception signal inputted to the receiving unit; and generating an addition signal produced by adding the amplification signal and the cancel signal. | 03-26-2009 |
20090086987 | Method and System for Removal of Clicks and Noise in a Redirected Audio Stream - There is provided a method of redirecting an audio stream from a first audio endpoint to a second audio endpoint in a computer operating system. The method includes directing the audio stream from a client application through a first audio resource stack to the first audio endpoint; creating an audio endpoint bridge to provide a path for the audio stream from the first audio resource stack through a second audio resource stack connected to the second audio endpoint; and redirecting the audio stream to the second audio endpoint using the audio endpoint bridge. The audio endpoint bridge can be created by forming a bridging application so as to activate the second audio stack. The bridging application can be hooked into a Windows audio engine in the second audio resource stack. The bridge can be used to intercept an audio stream and remove noise from it. Additionally, a specific type of noise with sporadic intermittent spikes has been observed in this audio framework with certain Bluetooth headsets. A system and method is described for removing this specific type of noise. | 04-02-2009 |
20090092261 | REDUCING ANNOYANCE BY MANAGING THE ACOUSTIC NOISE PRODUCED BY A DEVICE - One embodiment of the present invention provides a system that reduces annoyance by managing the acoustic noise produced by a device. During operation, the system receives a set of acoustic characteristics for noise-producing components within the device. The system then uses these acoustic characteristics to estimate the acoustic noise being generated by each of these noise-producing components. Next, the system aggregates this set of acoustic noise estimates to produce an aggregate estimate for the acoustic noise produced by the device. The system then analyzes this aggregate estimate using an acoustic annoyance model to determine the acoustic annoyance level. The system then adjusts a setting in the device to manage the acoustic annoyance level produced by the device. | 04-09-2009 |
20090092262 | MANAGING ACOUSTIC NOISE PRODUCED BY A DEVICE - One embodiment of the present invention provides a system that manages the acoustic noise produced by a device. During operation, the system receives a set of acoustic characteristics for the device. The system then uses these acoustic characteristics to estimate the acoustic noise being generated by the device. Next, the system uses the estimated acoustic noise to adjust a setting in the device to manage the acoustic noise produced by the device. | 04-09-2009 |
20090097668 | Method and apparatus for canceling non-uniform radiation patterns in array speaker system - An array speaker system canceling non-uniform radiation patterns and a method for implementing the same are provided. The method for canceling non-uniform radiation patterns includes predicting radiation patterns in an array speaker with respect to input signals, generating cancellation signals with respect to at least one region corresponding to non-uniform radiation patterns of the predicted radiation patterns, synthesizing the input signals and the cancellation signals, and outputting the synthesized signals to the array speaker. Sound signals from which non-uniform radiation patterns having distorted sound are cancelled such that a stable sound field having uniform radiation characteristics may be obtained and provided to a listener. | 04-16-2009 |
20090103744 | NOISE CANCELLATION CIRCUIT FOR ELECTRONIC DEVICE - A noise cancellation circuit for an electronic device includes a first input configured to receive an audio signal from a microphone included in the electronic device, and a second input configured to receive an accelerometer output signal from an accelerometer included in the electronic device. In addition, the noise cancellation circuit includes a comparison circuit for subtracting at least a part of the accelerometer output signal from the audio signal, and an output for outputting a result of the comparison circuit. | 04-23-2009 |
20090110208 | APPARATUS, MEDIUM AND METHOD TO ENCODE AND DECODE HIGH FREQUENCY SIGNAL - A method and apparatus to encoding or decoding an audio signal is provided. In the method and apparatus, a noise-floor level to use in encoding or decoding a high frequency signal is updated according to the degree of a voiced or unvoiced sound included in the signal. | 04-30-2009 |
20090116658 | ELECTRONIC DEVICE WITH MICROPHONE ARRAY CAPABLE OF SUPPRESSING NOISE - An electronic device includes a first acoustic opening, a first microphone, a second acoustic opening, a second microphone, two flexible boots, and two chambers. The first microphone receives sound through the first acoustic opening. The second microphone receives the sound through the second acoustic opening. The first and second acoustic openings are spaced at least about 8 cm. The first microphone and the second microphone are identical and disposed in the flexible boots. The flexible boots are identical and disposed in the chambers. The chambers are identical. | 05-07-2009 |
20090136052 | Active Noise Cancellation Using a Predictive Approach - A method for active noise cancellation in a volume generates a mathematical model of a noise process to be cancelled. Using the mathematical model, a noise signal in a next sample period is predicted from a measured noise signal. The predicted signal is inverted and applied to the volume. Destructive interference of the noise signal and the inverted signal cancels the noise in the volume. | 05-28-2009 |
20090136053 | NOISE CANCELLER, SOUND COLLECTOR HAVING THE NOISE CANCELLER, AND PORTABLE PHONE HAVING THE NOISE CANCELLER - A noise canceller configured to remove surrounding noise from a desirable sound collected by a first microphone, the noise canceller includes a second microphone arranged in a place separated from the first microphone and configured to collect the surrounding noise; a second amplifier circuit part configured to amplify an output signal of the second microphone and output the output signal; and a signal processing circuit part configured to remove the surrounding noise from a sound collected by the first microphone by using the output signal of the second amplifier circuit part. The second amplifier circuit part is provided in the vicinity of the second microphone. | 05-28-2009 |
20090154718 | Method and apparatus for suppressor backfill - In some communication applications, a near-end talker employs a cellular phone that either operates in a noisy environment and does not support artificial noise injection or injects noise but supports a simple, fixed noise injection. This may result in “blanking” of the background noise and result in repeated “are you still there?” questions or premature termination of a call. In order to prevent this feeling of “blanking,” a suppressor backfill module according to an example embodiment of the invention backfills those blank periods with noise, optionally in an inverse relationship with power of noise in a near-end signal, resulting in repairing sound quality degradation and giving a far end talker a feeling of call continuity. As a result, the near-end and far-end talker have a better experience during the call. | 06-18-2009 |
20090175461 | ACTIVE NOISE CONTROLLER - In an active noise reduction apparatus with an adaptive notch filter used, a triangle wave as a reference signal input into a first coefficient updater and a second coefficient updater reduces the number of execution times of product-sum operations in a reference signal generator to reduce the operation load. | 07-09-2009 |
20090175462 | Noise Reduction Systems and Methods for Voice Applications - Various embodiments reduce noise within a particular environment, while isolating and capturing speech in a manner that allows operation within an otherwise noisy environment. In one embodiment, an array of one or more microphones is used to selectively eliminate noise emanating from known, generally fixed locations, and pass signals from a pre-specified region or regions with reduced distortion. | 07-09-2009 |
20090190770 | Audio Privacy Apparatus And Method - Apparatus and Method for canceling or reducing voice sounds produced during a conversation by the user of a cellular telephone or other communication device such that other persons close to the user cannot hear the users voice and is not disturbed by the conversation. | 07-30-2009 |
20090214049 | Electrostatic Loudspeaker Array - A speaker system that includes an audio signal-receiving interface, a modulating circuit, a phase-control circuit, and a number of speaker units. The audio signal-receiving interface is configured to receive an audio signal, and the modulating circuit is coupled with the audio signal-receiving interface. The modulating circuit is configured to modulate a low frequency component of the audio signal and to generate a modulated signal. The phase-control circuit is coupled with the modulating circuit and the audio signal-receiving interface. The phase-control circuit is configured to receive the modulated signal and a high-frequency component of the audio signal and to control a phase of the modulated signal, a phase of the high-frequency component of the audio signal, or both. The speaker units are coupled with the phase-control circuit and configured to generate sound waves based on signals supplied by the phase-control circuit. | 08-27-2009 |
20090220101 | Method for the Active Reduction of Noise, and Device for Carrying Out Said Method - Disclosed in a method in which a digital system is used for actively reducing noise. According to the method, a digital user signal can be transmitted at a different sampling rate, the sampling rate being adjusted with the aid of adequate converters. | 09-03-2009 |
20090262951 | ACTIVE NOISE CONTROL APPARATUS - An active noise control apparatus that controls by a control sound a noise which is output from a noise source, includes: a control sound generating section which inputs a control signal, and produce the control sound; a residual noise detecting section which detects, as a residual noise signal, a noise remaining after the noise control by the control sound; a control signal generating section which inputs, as a reference signal, a signal concerning the noise or the generation state of the noise, and generates the control signal; and a controlling section which inputs the control signal and the residual noise signal, detects the components that cannot be identified in the control signal generating section, and controls the generation of the control signal in the control signal generating section. | 10-22-2009 |
20090279709 | SIGNAL PROCESSING DEVICE AND SIGNAL PROCESSING METHOD - A signal processing device includes: a filter processing unit configured to execute noise reduction operations by subjecting sound-collected signals from a sound-collecting unit to filtering processing based on preset filter properties and providing with signal properties for noise reduction; a noise-unreduced signal obtaining unit configured to obtain noise-unreduced signals obtained in a state where noise reduction operations by the filter processing unit are stopped; and a filter property selecting unit configured to obtain a difference between the noise-unreduced signals and noise-reduced signals obtained at the time of executing noise reduction operations with preset filter properties set to the filter processing unit as a candidate filter property, thereby obtaining a noise reduction effect indicator regarding the candidate filter property, and selecting filter properties to be set to the filter processing unit based on the noise reduction effect indicator. | 11-12-2009 |
20090304199 | Multiple Fan Acoustic Interaction Control - A fan control system includes a controller that is coupled to a plurality of fan couplers. A computer-readable medium is coupled to the controller and includes a first fan identification corresponding to a first fan, a second fan identification corresponding to a second fan, and at least one fan property associated with each of the first fan identification and the second fan identification. The controller is operable to monitor at least one operating parameter of each of the first fan and the second fan when the first fan and the second fan are coupled to a respective fan coupler. The controller is further operable to use the at least one fan property associated with each of the first fan identification and the second fan identification and the at least one operating parameter of each of the first fan and the second fan in order to adjust a speed of the second fan relative to a speed of the first fan. | 12-10-2009 |
20090310795 | Noise Reduction By Mobile Communication Devices In Non-Call Situations - In a preferred embodiment, the invention is a mobile communication device having a digital signal processor (DSP), a speaker output node, a local audio source, and an analog front-end (AFE), wherein: (1) the DSP receives a first audio signal corresponding to sound captured by a microphone near a user of the device, (2) if the device is operating in a call mode, the DSP derives a background noise signal from the first audio signal, for subtraction from the first audio signal before transmission to the AFE, and (3) if the device is operating in a non-call mode, then the DSP (i) generates a speaker output signal which substantially corresponds to the first audio signal subtracted from a local audio signal provided by the local audio source and (ii) provides the speaker output signal to a speaker via the speaker output node. | 12-17-2009 |
20090310796 | METHOD OF REDUCING RESIDUAL ACOUSTIC ECHO AFTER ECHO SUPPRESSION IN A "HANDS-FREE" DEVICE - The method comprises, in the time domain, echo cancellation processing ( | 12-17-2009 |
20090323975 | HEADPHONES WITH EMBEDDABLE ACCESSORIES INCLUDING A PERSONAL MEDIA PLAYER - A set of headphones is configured with an integrated accessory receiving space and a device connector that interface with a variety of different interchangeable accessories. The accessories can range from a personal media player that can render audio, such as MP3 (Moving Pictures Expert Group, MPEG-1, audio layer 3) content, to rechargeable battery packs, storage devices, and modules that can support wireless communication between the headphones and other devices such as media centers, game consoles, and personal computers (“PCs”). A user can pick an accessory and snap it into the receiving space of the headphones. When so installed, the accessory becomes physically and functionally embedded so that its functionality becomes seamlessly integrated with operation of the headphones. | 12-31-2009 |
20090323976 | NOISE REDUCTION AUDIO REPRODUCING DEVICE AND NOISE REDUCTION AUDIO REPRODUCING METHOD - A noise reduction audio reproducing method includes the steps of: generating, from an audio signal of collected and obtained noise, an audio signal for noise cancellation to cancel the noise by synthesizing the audio signal for noise cancellation and the noise in an acoustic manner, reproducing the audio signal for noise cancellation acoustically to synthesize this with the noise in an acoustic manner; emphasizing an audio component to be listened to, of collected audio; synthesizing an audio signal with the audio component to be listened to being emphasized, and the audio signal for noise cancellation to supply the synthesized signal thereof to an electro-acoustic converting unit; and controlling so as to supply an audio signal, with the audio component to be listened to having been emphasized, to a synthesizing unit, regarding only a section based on a control signal. | 12-31-2009 |
20100020980 | APPARATUS AND METHOD FOR REMOVING NOISE - Disclosed is a method of efficiently removing noise. The method includes: deciding a noise section by attenuating characteristics of a voice in a voice signal mixed with noise; determining the type of the noise in the decided noise section; and removing the noise from the noise-mixed voice signal by using noise information obtained through the determination. A clustering method or a similarity level measurement method is used to determine the type of the noise. Even in a voice signal that is mixed with various types of noise, noise can be precisely removed and thus distortion of a sound quality can be minimized. | 01-28-2010 |
20100046769 | NOISE-CANCELING SYSTEM - The noise canceling system includes: a microphone unit picking up ambient noise and outputting a noise signal; a cancel signal generator generating and outputting a cancel signal eliminating the noise, and having a filter circuit outputting a signal in a predetermined frequency band included in the noise signal, an inverting amplifier circuit inverting and amplifying the output signal of the filter circuit, an amplification degree being greater than zero and smaller than one, and an adding circuit outputting a signal obtained by adding the output signal of the inverting amplifier circuit to the noise signal; and a speaker unit outputting an audio signal and the cancel signal. | 02-25-2010 |
20100104109 | APPARATUS FOR PREVENTING LEAKAGE OF A WEAK SIGNAL FROM A SPEAKER - An apparatus for preventing leakage of a weak signal from a speaker is provided. The apparatus passes a normal speaker drive signal coming through speaker signal lines and blocks a weak signal generated by the sounds around the speaker, thereby preventing wiretapping the speaker. | 04-29-2010 |
20100128882 | AUDIO SIGNAL PROCESSING DEVICE AND AUDIO SIGNAL PROCESSING METHOD - In frequency signals obtained by converting input audio signals from time-domain signals to frequency-domain signals, a level control value setting unit | 05-27-2010 |
20100128883 | System And Method Of Calibrating An Echo Canceller Using Preemptive Tone Sequencing - A system for calibrating an echo canceller using a preemptive tone sequence is provided. The system includes a node and a tone sequence management unit operatively connected to the node. The node includes a speaker, a microphone, and the echo canceller operatively connected to the microphone. The tone sequence management unit transmits a digital tone sequence to the speaker. The speaker plays the digital tone sequence. The microphone records an output of the speaker, converts the output into a digital data segment, and transmits the digital data segment to the echo canceller. The echo canceller is calibrated based on the digital data segment. | 05-27-2010 |
20100135504 | Foldable wireless voice muffling device for mobile communications - A handheld foldable voice-muffling device using passive noise silencing materials to dampen noise and a microphonic transceiver to transmit a user's speech and receive incoming signals allowing him to wirelessly communicate with another person or other communication devices without causing a disturbance to others in his surrounding area. | 06-03-2010 |
20100150365 | SIGNAL PROCESSING DEVICE, ECHO CANCELLER, AND SIGNAL PROCESSING METHOD - If K=4N, wherein K is a number of subbands and N is a decimation ratio, an analysis filter process unit | 06-17-2010 |
20100150366 | APPARATUS AND METHOD FOR CANCELLING, REDUCING AND MODULATING NOISE SIGNAL AND FOR SIGNAL ENHANCING AND SIGNAL PROOFING - The embodiments herein provide an apparatus and method for cancelling signal noise. According to one embodiment, an apparatus for cancelling signal noise has a sensor or receiver to capture the undesirable signals. A transducer converts the energy of the captured signals and modulates the captured undesirable signals. A signal inverting circuit is connected to the transducer to generate the inverse of the captured undesirable signals by inverting the amplitude of the undesirable signal while maintain the frequency at the same level. The generated inverse of the undesirable signal transmitted by a transmitter is received by a receiver and output through a speaker so that the output inverse of the undesirable signal is combined with the undesirable signal to produce a desired signal environment. | 06-17-2010 |
20100166201 | Electromagnetically-countered speaker systems and methods - The present invention relates to electromagnetically-countered speaker systems for generating acoustic sounds according to dynamic signals supplied thereto while minimizing irradiation of harmful electromagnetic waves therefrom. More particularly, the present invention relates to various speaker systems which do not include speaker magnets but include driver members for generating the sounds while emitting such harmful waves and counter members for generating magnetic forces for providing such sound while emitting counter electromagnetic waves capable of canceling at least a substantial portion of the harmful waves based on their configurational and phase characteristics. The present invention also relates to various speaker systems which do not include speaker magnets but include various electric and/or magnetic shields in addition to such drive and counter members. The present invention also relates to various methods of minimizing irradiation of the harmful waves of the speaker systems by the counter members, various methods of shielding such harmful waves by the electric and/or magnetic shields, and the like. The present invention further relates to various processes for providing such systems, counter members thereof, and electric and/or magnetic shields therefor. | 07-01-2010 |
20100172509 | Electromagnetically-countered piezo speaker systems and methods - The present invention relates to an electromagnetically-countered system including at least one wave source irradiating harmful electromagnetic waves and at least one counter unit emitting counter electromagnetic waves by countering the harmful waves by such counter waves. More particularly, the present invention relates to generic counter units for electromagnetically-countered piezoelectric speaker systems and to various mechanisms for countering the harmful waves by such counter units by, e.g., matching configurations of the counter units with those of the wave sources, matching such counter waves with wavefronts of the harmful waves, and the like. The present invention relates to various methods of countering the harmful waves with the counter waves by such source matching or wave matching and various methods of providing the counter units as well as counter waves. The present invention further relates to various processes for providing such systems, such counter units thereof, and the like. The present invention relates to various electric shields and/or magnetic shields which may be used alone or in conjunction with the counter units to minimize irradiation of the harmful waves from the system. | 07-08-2010 |
20100215185 | ACOUSTIC ECHO CANCELLATION - An input signal is supplied to a loudspeaker-room-microphone system having a transfer function and that provides an output signal. An adaptive filter unit models the transfer function of the loudspeaker-room-microphone system and provides an approximated output signal, where the output signal and the approximated output signal are subtracted from each other to provide an error signal. The modeling of the transfer function of the loudspeaker-room-microphone system in the adaptive filter comprises transforming the input signal and the error signal from the time domain into the spectral domain; delaying of the input signal in the frequency domain to generate multiple differently delayed input signals in the frequency domain; adaptive filtering of each one of the multiple differently delayed input signals in the frequency domain according to the error signal in the spectral domain; summing up of the filtered differently delayed input signals in the frequency domain to generate the approximated output signal in the frequency domain; and transforming the approximated output signal from the spectral domain into the time domain. | 08-26-2010 |
20100226504 | SOUND SOURCE SEPARATING APPARATUS AND SOUND SOURCE SEPARATING METHOD - There is disclosed a sound source separating apparatus ( | 09-09-2010 |
20100232616 | NOISE ERROR AMPLITUDE REDUCTION | 09-16-2010 |
20100239101 | Digital speaker driving apparatus - A digital sound system suitable for a digital speaker device for directly converting analog sound by a circuit using a ΔΣ modulator and a mismatch shaping filter circuit to output a plurality of digital signals and a plurality of speakers driven by the plurality of digital signals. A digital speaker driving device includes a ΔΣ modulator, a post filter, s driving circuits, and a power supply circuit to supply power to the ΔΣ modulator, the post filter and the s driving elements and the s driving circuits are adapted to s digital signal terminals. | 09-23-2010 |
20100254541 | NOISE SUPPRESSING DEVICE, NOISE SUPPRESSING CONTROLLER, NOISE SUPPRESSING METHOD AND RECORDING MEDIUM - A noise suppressing device includes: a suppressing unit for suppressing noise by subtracting a noise component derived on the basis of a plurality of sound signals output by a sound receiving unit from the sound signals; a variation deriving unit for deriving a degree of variation by numerically quantizing the variation on the basis of a spectrum obtained by converting the plurality of sound signals to components on a frequency axis; a determining unit for determining that wind noise is occurring due to wind blowing against the sound receiving units when the degree of variation is equal to or greater than a value; and an adjusting unit for adjusting an amount of suppression according to the decision of the determining unit; wherein the suppressing unit suppresses noise by subtracting the noise component from the sound signals based on the amount of suppression adjusted by the adjusting unit. | 10-07-2010 |
20100260345 | SYSTEM FOR ACTIVE NOISE CONTROL BASED ON AUDIO SYSTEM OUTPUT - An active noise control (ANC) system is configured to generate at least one anti-noise signal configured to drive a speaker to generate sound waves to destructively interfere with an undesired sound present in a target space. The at least one anti-noise signal is adjusted based an output signal of an audio system. The at least one anti-noise signal may be adjusted based on at least one of a volume level of the audio system, a power level of at least one predetermined frequency or frequency range of the output signal of the audio system, frequency content of an output signal of the audio system. The ANC system receives an error signal to adjust generation of the at least one anti-noise signal. The error signal is adjusted to compensate for adjustment of the at least one anti-noise signal based on the output signal of the audio system. | 10-14-2010 |
20100260346 | Voice Input Device, Method of Producing the Same, and Information Processing System - A voice input device includes a first microphone ( | 10-14-2010 |
20100266134 | SYSTEM FOR ACTIVE NOISE CONTROL WITH AN INFINITE IMPULSE RESPONSE FILTER - An active noise control (ANC) system includes at least one infinite impulse response filter (IIR). The IIR filter generates an output signal based on an input signal representative of an undesired sound. The ANC system generates an anti-noise signal based on the output signal of the IIR filter. The anti-noise signal is used to drive a speaker to generate sound waves to destructively interfere with the undesired sound. The ANC system includes an update system to generate update coefficients. The update system determines the stability of the update coefficients. Coefficients of the IIR filter are replaced with the update coefficients. The update system generates a set of update coefficients for each sample of the input signal. | 10-21-2010 |
20100272274 | Methods and systems for robust approximations of impulse reponses in multichannel audio-communication systems - Proper estimation of impulse responses is an important and challenging aspect of multichannel echo control. Various embodiments of the present invention are directed to real-time, adaptive acoustic echo cancellation methods in multichannel audio-communication systems. In particular, embodiments of the present invention use a collection of a room's past impulse responses to determine an optimal lower dimensional impulse response space as the underlying search subspace for approximate impulse responses. As a result, embodiments of the present invention mitigate inherent instability of multichannel audio-communication systems and provide stable and accurate echo removal without distorting audio signals. | 10-28-2010 |
20100278352 | Wind Suppression/Replacement Component for use with Electronic Systems - Systems and methods to reduce the negative impact of wind on an electronic system include use of a first detector that receives a first signal and a second detector that receives a second signal. A voice activity detector (VAD) coupled to the first detector generates a VAD signal when the first signal corresponds to voiced speech. A wind detector coupled to the second detector correlates signals received at the second detector and derives from the correlation wind metrics that characterize wind noise that is acoustic disturbance corresponding to at least one of air flow and air pressure in the second detector. The wind detector controls a configuration of the second detector according to the wind metrics. The wind detector uses the wind metrics to dynamically control mixing of the first signal and the second signal to generate an output signal for transmission. | 11-04-2010 |
20100290635 | SYSTEM FOR ACTIVE NOISE CONTROL WITH ADAPTIVE SPEAKER SELECTION - An active noise control system generates an anti-noise signal to drive a first speaker group including at least one speaker to produce sound waves to destructively interfere with an undesired sound in at least one quiet zone. The active noise control system receives error signals representative of a combination of undesired sound and destructively interfering sound waves produced by the first speaker group. The active noise control system may select a second speaker group to replace the first speaker group based on the error signals. | 11-18-2010 |
20100296665 | NOISE SUPPRESSION APPARATUS AND PROGRAM - A In a noise suppression apparatus, an extractor extracts a noise component from an audio signal. A stationary noise estimator estimates stationary noise included in the noise component. A first noise suppressor removes a spectrum of the stationary noise from a spectrum of the audio signal to an extent determined by a subtraction factor. A non-stationary noise estimator estimates a spectrum of non-stationary noise by subtracting the spectrum of the stationary noise from the spectrum of the noise component. A factor setter generates a filtering factor for emphasizing a target sound component contained in the audio signal from the spectrum of the non-stationary noise. A second noise suppressor performs a filtering process using the filtering factor on the audio signal after processing of the first noise suppressor. An index calculator calculates a kurtosis change index representing an extent of change of kurtosis in a frequence distribution of magnitude of the audio signal between the kurtosis observed when processing of the first noise suppression part is performed and the kurtosis observed when processing of the second noise suppression part is performed. A factor adjuster variably controls the subtraction factor according to the kurtosis change index. | 11-25-2010 |
20100310083 | ELECTRONIC DEVICE WITH NOISE-SUPPRESSION SYSTEM - An electronic device with at least one ventilator unit and at least one housing part with at least one ventilation opening. The electronic device includes a noise-suppression system with at least one microphone for registering noise vibrations for the output of vibration signals. The noise-suppression system further includes at least one processor unit for the reception of the vibration signals, for the determination of control signals dependent upon the vibration signals and for the output of the control signals. The noise-suppression system furthermore includes at least one electro-mechanical converter for the reception of the control signals and for the application onto the housing part of forces corresponding to the control signals and for the targeted formation of the housing-part vibrations. | 12-09-2010 |
20100322432 | FREQUENCY CONTROL BASED ON DEVICE PROPERTIES - There is provided a method of controlling a noise cancellation system, the noise cancellation system being for use in a device comprising a speaker for receiving a wanted signal and generating a sound signal therefrom, and the noise cancellation system comprising: a digital filter, for generating a noise cancellation signal from an input signal representative of ambient noise; and an output for applying the noise cancellation signal to the speaker in addition to the wanted signal to generate a sound signal from which the ambient noise has been at least partially cancelled. The method comprises: determining a resonant frequency of the speaker; based on the determined resonant frequency, selecting a set of filter coefficients; and applying the selected set of filter coefficients to the digital filter. | 12-23-2010 |
20100329473 | Apparatus, method and computer program - An apparatus, method and computer program where the apparatus comprises: a filter configured to filter an electrical input signal and provide a filtered electrical input signal to an audio output device; an audio output device configured to convert the filtered electrical input signal to an acoustic output signal; a microphone configured to detect an acoustic signal and provide an electrical output signal corresponding to the detected acoustic signal; and a detector configured to receive the filtered electrical input signal provided to the audio output device as a first input and the electrical output signal provided by the microphone as a second input; wherein the detector is configured to detect a change in the signal power of the electrical output signal provided by the microphone relative to the filtered electrical input signal provided to the audio output device and, in response to the detection of the change in the signal power, provide a control signal to the filter to control the filter to compensate for the detected change in signal power. | 12-30-2010 |
20110007906 | Wind Noise Classifier - A special purpose machine measures and modulates communication signals that are parsed into frames. Frames of signals modulated and measured to have certain qualities are deemed to be the result of wind noise. Frames of wind noise are cancelled from further use within a communication system. | 01-13-2011 |
20110026722 | Vibration Sensor and Acoustic Voice Activity Detection System (VADS) for use with Electronic Systems - A voice activity detector (VAD) combines the use of an acoustic VAD and a vibration sensor VAD as appropriate to the conditions a host device is operated. The VAD includes a first detector receiving a first signal and a second detector receiving a second signal. The VAD includes a first VAD component coupled to the first and second detectors. The first VAD component determines that the first signal corresponds to voiced speech when energy resulting from at least one operation on the first signal exceeds a first threshold. The VAD includes a second VAD component coupled to the second detector. The second VAD component determines that the second signal corresponds to voiced speech when a ratio of a second parameter corresponding to the second signal and a first parameter corresponding to the first signal exceeds a second threshold. | 02-03-2011 |
20110051945 | Reduction of Clicking Sounds in Audio Data Stream - Disclosed is a method of reducing clicking sounds in an audio data stream. The samples of the audio data are delayed by a predetermined amount in a sliding window containing a predetermined number of samples. The presence of a clicking sound in the delayed data within said sliding window is detected and the corresponding audio data replaced by substitute data derived from the audio data stream. | 03-03-2011 |
20110075854 | ACTIVE NOISE CONTROLLER - On an active noise controller, an adjustment reference signal generator generates an adjustment reference signal Sra by reading the waveform data sequentially at a read location shifted by a given amount from a read location for a reference signal Sr with respect to the waveform data at a reference signal generator. A one-tap adaptive filter generates a control signal Scp by multiplying the adjustment reference signal Sra by a filter factor W. A gain controller outputs a compensation control signal Sca generated by multiplying the control signal Scp by gain G. A speaker outputs the compensation control signal Sca as a cancellation sound. | 03-31-2011 |
20110103603 | Noise Reduction System and Noise Reduction Method - A noise reduction system and a noise reduction method are provided. The noise reduction system comprises a uni-directional microphone, an omni-directional microphone and a signal processing module. The signal processing module comprises an adaptive noise control (ANC) unit, a main noise reduction unit and an optimizing unit. The uni-directional microphone senses a first audio source to output a first audio signal, and the omni-directional microphone senses a second audio source to output a second audio signal. The ANC unit executes an adaptive noise control to output an estimated signal according to the first audio signal and the second audio signal. The main noise reduction unit executes a main noise reduction process to output a de-noise speech signal according to the estimated signal and the second audio signal. The optimizing unit executes an optimizing process to output an optimized speech signal according to the de-noise speech signal. | 05-05-2011 |
20110103604 | GENERIC ELECTROMAGNETICALLY-COUNTERING PROCESSES - The present invention relates to an electromagnetically-countered system including at least one wave source irradiating harmful electromagnetic waves and at least one counter unit emitting counter electromagnetic waves for countering the harmful waves by such counter waves. More particularly, the present invention relates to generic counter units of electromagnetically-countered systems and to various mechanisms for countering the harmful waves by the counter units such as, e.g., by matching configurations of the counter units with those of the wave sources, matching shapes of such counter waves with shapes of the harmful waves, and the like. The present invention also relates to various methods of countering the harmful waves with the counter waves by such source matching or wave matching and various methods of providing the counter units as well as counter waves. The present invention further relates to various processes for providing such systems, such counter units thereof, and the like. The present invention relates to various electric and/or magnetic shields which may be used alone or in conjunction with such counter units to minimize irradiation of the harmful waves from the system. | 05-05-2011 |
20110116645 | ACTIVE NOISE CONTROL SYSTEM AND METHOD - An Active Noise Control (ANC) for controlling a noise produced by a noise source may include an acoustic sensor ( | 05-19-2011 |
20110142247 | MMethod for Adaptive Control and Equalization of Electroacoustic Channels - An electroacoustic channel soundfield is altered. An audio signal is applied by an electromechanical transducer to an acoustic space, causing air pressure changes therein. Another audio signal is obtained by a second electromechanical transducer, responsive to air pressure changes in the acoustic space. A transfer function estimate of the electroacoustic channel is established, responsive to the second audio signal and part of the first audio signal. The transfer function estimate is derived to be adaptive to temporal variations in the electroacoustic channel transfer function. Filters are obtained with transfer functions based on the transfer function estimate. Part of the first audio signal is filtered therewith. | 06-16-2011 |
20110158419 | ADAPTIVE DIGITAL NOISE CANCELLER - Systems and methods for adaptive feed-forward noise cancellation. The system includes a plurality of reference microphones, an error microphone, a secondary path module, an adaptation controller, and a canceller filter. A finite impulse response (“FIR”) based plant model is converted to an infinite impulse response (“IIR”) based plant model using balanced model reduction. Due to the inherent instability of the adaptive IIR filter, the Schur-Cohn stability test is applied to the denominator coefficients of the IIR filter transfer function to determine the stability of the noise cancellation system. A secondary path of the noise cancellation system is identified in an on-line manner in the secondary path module. If the energy level of the communication signal (e.g., a music signal) is strong, secondary path identification is performed. The adaptation controller controls the updating of the IIR transfer function based on the stability determination and the secondary path. An anti-noise signal is then generated and added to the communication signal. The anti-noise signal is generated within approximately 60 or fewer micro-seconds. | 06-30-2011 |
20110170699 | Loudspeaker and System for Active Noise Cancellation - A loudspeaker for active noise cancellation is disclosed in which a measurement microphone ( | 07-14-2011 |
20110182436 | Adaptive Noise Reduction Using Level Cues - An array of microphones utilizes two sets of two microphones for noise suppression. A primary microphone and secondary microphone of the three microphones may be positioned closely spaced to each other to provide acoustic signals used to achieve noise cancellation. A tertiary microphone may be spaced with respect to either the primary microphone or the secondary microphone in a spread-microphone configuration for deriving level cues from audio signals provided by tertiary and the primary or secondary microphone. Signals from two microphones may be used rather than three microphones. The level cues are expressed via an inter-microphone level difference (ILD) which is used to determine one or more cluster tracking control signals. The ILD based cluster tracking signals are used to control the adaptation of null-processing noise cancellation modules. A noise cancelled primary acoustic signal and ILD based cluster tracking control signals are used during post filtering to adaptively generate a mask to be applied against a speech estimate signal. | 07-28-2011 |
20110211707 | REALISATION OF CONTROLLER TRANSFER FUNCTION FOR ACTIVE NOISE CANCELLATION - An apparatus for realizing an active noise cancellation control law transfer function between a sensing microphone and a speaker. The apparatus includes a multiplicity of filters. Each filter is operable over a different frequency range. At least one filter has an adjustable parameter whereby the filter can be adjusted such that the filters cumulatively realize a required control law transfer function. The adjustable parameter may in one embodiment be the amplitude. In other embodiments, it may be other parameters. | 09-01-2011 |
20110222698 | NOISE REDUCTION DEVICE - A noise reduction device of the present invention comprises a control filter unit for generating a control sound signal to cancel out a noise, a control speaker for outputting a control sound according to the control sound signal from the control filter unit, an error microphone for detecting a residual sound by superimposing the noise upon the control sound output from the control speaker, and an obstacle detector for detecting an obstacle around the error microphone, wherein the control filter unit generates the control sound signal according to data from the error microphone and the obstacle detector. | 09-15-2011 |
20110268288 | NOISE GATE, SOUND COLLECTION DEVICE, AND NOISE REMOVING METHOD - A purpose of the invention is to provide a noise gate that can output an audio signal in which only a stationary noise is removed, without degrading an utterance voice of a speaking person. A sound collection device | 11-03-2011 |
20110274282 | Multi microphone sampling method and circuit with single ADC front end - The invention relates generally to means and methods of improving the Signal to Noise Ratio (SNR) in communication devices. In particular, means and methods of alternating microphone inputs are disclosed. Multiple microphones are used to increase the SNR in a communication device that is capable of storing the input from only one microphone at a time. By alternating the inputs from the microphones and storing the inputs, multi-channel noise reduction techniques are employed in a system similar to a single channel system. Existing sigma-delta analog to digital converters may be used to time the switching between the microphones alternately. The microphones may be switched by relays, flip-flops, transistors, or other means. As the SNR is improved, traffic in a communications network may be increased by increasing the number of users in response to the lower bandwidth required. | 11-10-2011 |
20110280410 | ACTIVE NOISE CONTROL APPARATUS - An active noise control apparatus includes a control frequency detector for determining a control frequency which is a frequency of a noise to be controlled, a sine-wave generator for generating a reference sine-wave signal having the determined control frequency, a cosine-wave generator for generating a reference cosine-wave signal having the determined control frequency, a first one-tap digital filter for outputting a first control signal obtained by multiplying the reference sine-wave signal by a first filter coefficient, a second one-tap digital filter for outputting a second control signal obtained by multiplying the reference cosine-wave signal by a second filter coefficient, an interference signal generator for generating an interference signal based on a noise control signal obtained by summing the first control signal and the second control signal, an error signal detector for detecting an error signal produced due to an interference between the interference signal and the noise, first and second coefficient updating units for updating the first and second filter coefficients according to the error signal, and a control frequency corrector for correcting the control frequency according to the first and second filter coefficients. This active noise control apparatus can reduce a noise effectively even if the control frequency shifts from the frequency of a noise actually generated. | 11-17-2011 |
20110286604 | MICROPHONE ARRAY DEVICE - A microphone array device includes a first sound reception unit configured to obtain a first sound signal that is input from a first microphone, a second sound reception unit configured to obtain a second sound signal that is input from a second microphone, a noise state evaluation unit configured to compare the first sound signal and the second sound signal and to obtain an evaluation parameter to evaluate an influence of a non-target sound included in the second sound signal on a target sound included in the first sound signal according to a result of the comparison, a subtraction adjustment unit configured to set a suppression amount for the second sound signal based on the evaluation parameter and to generate a third sound signal; and a subtraction unit configured to generate a signal to be output based on the third sound signal and the first sound signal. | 11-24-2011 |
20110286605 | NOISE SUPPRESSOR - A voice/noise section decision unit | 11-24-2011 |
20110286606 | METHOD AND SYSTEM FOR NOISE CANCELLATION - A noise cancellation signal is generated based on detected ambient noise, such that the noise cancellation signal and a wanted sound signal can be applied to a speaker. Gain control is applied to the wanted sound signal based on a comparison between the detected ambient noise level and the wanted sound signal level, for example such that the level of the wanted sound signal after the gain has been applied exceeds the level of a detected ambient noise signal by a certain threshold. Steps may also be taken such that the total level of the wanted sound signal after the gain has been applied and of the detected ambient noise signal do not exceed a second threshold, to avoid saturating the speaker to which they are applied. | 11-24-2011 |
20110305347 | ADAPTIVE NOISE CONTROL - Adaptive noise control for reducing power of an acoustic noise signal radiated from a noise source to a listening position comprises providing an electrical reference signal correlated with the acoustic noise signal; filtering the electrical reference signal with an adaptive filter to provide an electrical output signal; multiplying the electrical output signal of the adaptive filter by a gain factor to provide a first electrical compensation signal; filtering and multiplying the electrical output signal of the adaptive filter by the inverse of the gain factor to provide a second electrical compensation signal, the second gain factor being equal to 1 subtracted by the first gain factor; radiating the first electrical compensation signal to the listening position with an acoustic transducer; sensing a residual electrical error signal at the listening position; adding the second electrical compensation signal to the electrical error signal to provide a compensated error signal; and adapting filter coefficients of the adaptive filter as a function of the compensated error signal and the reference signal. | 12-15-2011 |
20110311067 | DIGITAL SOUND LEVELING DEVICE AND METHOD TO REDUCE THE RISK OF NOISE INDUCED HEARING LOSS - Devices and methods for digital sound leveling are disclosed. The subject devices and methods can be used to reduce the risk of noise induced hearing loss. According to an embodiment, an audio file can be parsed into frames that are filtered using an A-weighted digital filter and scaled to a desired power level. Accordingly, the dynamic range of an audio output at a particular volume level can be controlled. | 12-22-2011 |
20110311068 | System for Suppressing Passing Tire Hiss - A voice enhancement logic improves the perceptual quality of a processed voice. The voice enhancement system includes a passing tire hiss noise detector and a passing tire hiss noise attenuator. The passing tire hiss noise detector detects a passing tire hiss noise by modeling the passing tire hiss. The passing tire hiss noise attenuator dampens the passing tire hiss noise to improve the intelligibility of a speech signal. | 12-22-2011 |
20120014531 | Digital Data Transfer Via Audio Signal Conductors - An electro-acoustic transducer or a device into which an electro-acoustic transducer is incorporated has at least two audio signal conductors through which the electro-acoustic transducer or device may be coupled to another device to convey analog audio signals representing sounds at a time when the other device places a relatively low DC bias voltage across the at least two audio signal conductors, and to be operated as a digital serial bus to exchange pieces of digitally-encoded data concerning the electro-acoustic transducer at a time when the other device places a relatively high DC bias voltage across the at least two audio signal conductors. | 01-19-2012 |
20120020489 | NOISE CANCELLER AND NOISE CANCELLATION PROGRAM - A directivity control unit | 01-26-2012 |
20120020490 | Removing Noise From Audio - The subject matter of this specification can be embodied in, among other things, a computer-implemented method for removing noise from audio that includes building a sound model that represents noises which result from activations of input controls of a computer device. The method further includes receiving an audio signal produced from a microphone substantially near the computer device. The method further includes identifying, without using the microphone, an activation of at least one input control from among the input controls. The method further includes associating a portion of the audio signal as corresponding to the identified activation. The method further includes applying, from the audio model, a representation of a noise for the identified activation to the associated portion of the audio signal so as to cancel at least part of the noise from the audio signal. | 01-26-2012 |
20120027219 | FORMANT AIDED NOISE CANCELLATION USING MULTIPLE MICROPHONES - A noise cancellation device includes a plurality of first computation modules, a formant detection module, a direction of arrival module and a beamformer. The plurality of first computation modules receives raw audio data and generates a respective transformed signal as a function of formants. A first transformed signal relates to speech data and a second transformed signal relates to noise data. The formant detection module receives the first transformed signal and generates a frequency range data signal. The direction of arrival module receives the first and second transformed signals, determines a cross-correlation between the first and second transformed signals, and generates a spatial orientation data signal. The beamformer receives the first and second transformed signals, the frequency range data signal, and the spatial orientation data signal and generates modification data at selected formant ranges to eliminate a maximum amount of the noise data. | 02-02-2012 |
20120027220 | ACOUSTIC DEVICE, NOISE CONTROL METHOD, NOISE CONTROL PROGRAM, AND RECORDING MEDIUM - When the signal level of a signal AOD, to which a cancellation signal CND of ACD is added, is larger than the signal level of ACD, a rate of change calculation part 173 calculates the maximum value (=1) as a rate of change parameter for showing that the degree of noise cancellation should be made highest. When the signal level of AOD, to which CND of ACD is added, is smaller than the signal level of ACD, the rate of change calculation part | 02-02-2012 |
20120033821 | ACTIVE VIBRATION NOISE CONTROL DEVICE - An active vibration noise control device having a pair of speakers, including: a basic signal generating unit generating a basic signal based on a vibration noise frequency; an adaptive notch filter generating a first control signal provided to one speaker using a first filter coefficient and generating a second control signal provided to the other speaker using a second filter coefficient to cancel the generated vibration noise; a microphone detecting cancellation error between the vibration noise and the control sounds and outputting an error signal; a reference signal generating unit generating a reference signal based on a transfer function from the speakers to the microphone; a filter coefficient updating unit updating first and second filter coefficients, minimize the error signal; and a phase difference limiting unit limiting a phase difference between control sounds generated by different speakers. Therefore, it becomes possible to appropriately ensure a uniform and wide noise-cancelled area. | 02-09-2012 |
20120039480 | METHOD AND APPARATUS FOR IMPROVED DIRECTIVITY OF AN ACOUSTIC ANTENNA - The present invention provides a method of controlling an acoustic transducer array to generate a directional sound profile, the method including the steps of:
| 02-16-2012 |
20120045071 | METHOD AND DEVICE FOR REDUCING SNORE ANNOYANCES - The present invention relates to a method and a device for reducing snore annoyances, wherein a snore sound pattern of a snoring person is determined to predict an upcoming snore sound level and wherein a faked snore sound is played to flatten the resulting snore sound level. | 02-23-2012 |
20120057716 | Generating Acoustic Quiet Zone by Noise Injection Techniques - A quiet zone generation technique for acoustic/audio signals is proposed for mitigation of selected noise or interferences over limited areas in free space by injecting the very acoustic noise, interference, or audio feedback signals via iterative processing, generating quiet zones dynamically. This creates undesired noise-free quiet zones. Optimization loops operating iteratively to electronically process cancellation signals consist of three interconnected functional blocks: (1) an acoustic injection array, consisting of pick-up arrays to obtain the interference signals, beam forming networks for element weighting and/or re-positioning, and array elements for noise injections, (2) a diagnostic network with strategically located probes, and (3) an optimization processor with cost minimization algorithms to calculate element weights for updating. | 03-08-2012 |
20120063610 | SIGNAL ENHANCEMENT USING WIRELESS STREAMING - A method, device and system enhance an audio signal in a receiving device. The method comprises acoustically propagating a target signal from an acoustic source along an acoustic propagation path, providing a propagated acoustic signal at the receiving device; converting the received propagated acoustic signal to a propagated electric signal, the received propagated acoustic signal comprising the target signal, noise and possible other sounds from the environment as modified by the propagation path from the acoustic source to the receiving device; wirelessly transmitting a signal comprising the target audio signal to the receiving device; receiving the wirelessly transmitted signal in the receiving device; retrieving a streamed target audio signal from the wirelessly received signal comprising the target audio signal; and estimating the target signal from the propagated electric signal and the streamed target audio signal using an adaptive system. | 03-15-2012 |
20120121100 | Method and Apparatus For Wind Noise Detection and Suppression Using Multiple Microphones - Unlike sound based pressure waves that go everywhere, air turbulence caused by wind is usually a fairly local event. Therefore, in a system that utilizes two or more spatially separated microphones to pick up sound signals (e.g., speech), wind noise picked up by one of the microphones often will not be picked up (or at least not to the same extent) by the other microphone(s). Embodiments of methods and apparatuses that utilize this tact and others to effectively detect and suppress wind noise using multiple microphones that are spatially separated are described. | 05-17-2012 |
20120140940 | METHOD AND DEVICE FOR CANCELLING ACOUSTIC ECHO - An acoustic control device for generating a pseudo echo signal by filtering an input remote speaker signal by using a plurality of adaptive filters and controlling the adaptive filters to perform filtering based on filter coefficients generates an error signal by subtracting a pseudo echo signal from an input nearby speaker signal, determines a convergence state of the filter coefficient based on the error signal, and controls the width of data input to the adaptive filter when the filter coefficient is determined to be converged | 06-07-2012 |
20120148060 | AUTOMATIC POLARITY ADAPTATION FOR AMBIENT NOISE CANCELLATION - A sound reproducing device has a loudspeaker arranged to produce sound from an audio signal provided by an audio signal source. A microphone is positioned to pick up ambient noise and generate a microphone signal which comprises the noise. An ambient noise cancellation (ANC) system receives the microphone signal from the microphone and generates anti-noise corresponding to the ambient noise in the microphone signal. An automatic polarity adaptation (AAP) system monitors the ANC system and, when a decision criterion is fulfilled, causes a switch in polarity for the generated anti-noise. | 06-14-2012 |
20120163613 | NOISE REDUCTION APPARATUS AND METHOD, AND PROGRAM - A noise reduction apparatus includes a microphone that picks up a noise from surroundings of a casing, a cancellation signal generating section that generates a cancellation signal for reducing the noise from surroundings, by applying filtering to a signal picked up by the microphone, a predicted signal computing section that computes a predicted signal by predicting a noise from surroundings leaking into the casing, on a basis of the signal picked up by the microphone, an additional-signal control section that generates an additional signal for improving a listening feel of an actual residual noise, on a basis of a predicted residual noise obtained by adding the cancellation signal and the predicted signal, and an addition/output section that adds and outputs the additional signal and the cancellation signal. | 06-28-2012 |
20120163614 | SOUND SIGNAL OUTPUT DEVICE, SPEAKER DEVICE, SOUND OUTPUT DEVICE, AND SOUND SIGNAL OUTPUT METHOD - A sound signal output device includes a noise cancelling signal generation unit that generates a noise cancelling signal from a sound collecting signal using a microphone provided in a connected speaker device, and a sound signal output processing unit that synthesizes a main sound signal with the noise cancelling signal and amplifies a signal, performs an output limitation process for sound pressure limitation for the main sound signal, and does not perform the output limitation process for the noise cancelling signal, when an output sound signal for a connected speaker device is generated. | 06-28-2012 |
20120163615 | FILTER BANK OPTIMIZATION FOR ACOUSTIC ECHO CANCELLATION - A communications device is presented for providing bi-directional audio communications between a near-end user and a far-end user via a bidirectional communications channel. The communications device includes an adaptive echo canceller receiving a near-end audio signal and a far-end audio signal and providing an echo-canceled near-end audio signal for transmission to the far-end user via the communications channel. The adaptive echo canceller includes a first bank of analysis filters for filtering the near-end audio signal, a second bank of analysis filters for filtering the far-end audio signal, and a bank of synthesis filters for filtering sub-band echo-canceled signals generated within the adaptive echo canceller. The first and second filter banks have a frequency response optimized to reduce echo residual gain. | 06-28-2012 |
20120170763 | SYSTEM FOR ACTIVE NOISE CONTROL WITH AUDIO SIGNAL COMPENSATION - An active noise control system generates an anti-noise signal to drive a speaker to produce sound waves to destructively interfere with an undesired sound in a targeted space. The speaker is also driven to produce sound waves representative of a desired audio signal. Sound waves are detected in the target space and a representative signal is generated. The representative signal is combined with an audio compensation signal to remove a signal component representative of the sound waves based on the desired audio signal and generate an error signal. The active noise control adjusts the anti-noise signal based on the error signal. The active noise control system converts the sample rates of an input signal representative of the undesired sound, the desired audio signal, and the error signal. The active noise control system converts the sample rate of the anti-noise signal. | 07-05-2012 |
20120170764 | SYSTEM FOR ACTIVE NOISE CONTROL WITH AUDIO SIGNAL COMPENSATION - An active noise control system generates an anti-noise signal to drive a speaker to produce sound waves to destructively interfere with an undesired sound in a targeted space. The speaker is also driven to produce sound waves representative of a desired audio signal. Sound waves are detected in the target space and a representative signal is generated. The representative signal is combined with an audio compensation signal to remove a signal component representative of the sound waves based on the desired audio signal and generate an error signal. The active noise control adjusts the anti-noise signal based on the error signal. The active noise control system converts the sample rates of an input signal representative of the undesired sound, the desired audio signal, and the error signal. The active noise control system converts the sample rate of the anti-noise signal. | 07-05-2012 |
20120201396 | AUDIO SIGNAL COMPONENT COMPENSATION SYSTEM - A system and method for compensating audio signal components is disclosed. The method includes detecting, by a microphone, a sound signal. The sound signal comprises audio signal components resulting from reproducing an audio signal of an audio source and speech signal components corresponding to a speech signal from a person. The sound signal is filtered to whiten the sound signal. The audio signal components in the whitened sound signal are then compensated. The whitening of the compensated sound signal is removed. The filtering of the audio signal is performed using at least two filters in an alternating way, each filter using time-dependent filter coefficients. | 08-09-2012 |
20120207316 | Operation of a Noise Cancellation Device - A method for improving the performance of a noise cancellation device, the method includes determining whether one or more noise making objects (NMO) are near an audible range of the noise cancellation device and receiving a signal from the one or more NMOs indicative of a kind of noise the one or more NMOs is generating. The method also includes selecting a specific noise cancellation model to reduce an expected noise in response to the received kind of noise the one or more NMOs is generating. | 08-16-2012 |
20120237048 | APPARATUS AND METHOD FOR ECHO SUPPRESSION - An input signal from the input source is received. An attenuation of an echo canceller filter is calculated using at least the input signal. A spectral component of a frequency band of an echo suppressor is adjusted to perform enhanced suppression using the calculated attenuation. A comfort noise factor is calculated using at least the input signal and the calculated attenuation. The comfort noise to the output of the echo suppressor is adjusted to obtain a modified input signal. | 09-20-2012 |
20120237049 | WIDE AREA NOISE CANCELLATION SYSTEM AND METHOD - An open air, wide area noise cancellation system and method provides improved identification and characterization of noise sources then generating noise cancelling sound waves. | 09-20-2012 |
20120250872 | Method and System for Modeling External Volume Changes Within an Acoustic Echo Canceller - A method and system are provided in which a device, such as an acoustic echo canceller, may reduce the residual echo that may be heard at the far end of a conversation when an external speaker volume is changed. The device may compute a gain based on an echo estimate produced by a filter and on a near-end signal comprising audio information. The gain may be based on a correlation of the echo estimate and the near-end signal that tracks the changes in volume. Once computed, the gain may be validated to ensure that it is being applied when appropriate. The echo estimate may be adjusted by first applying the gain to an output of the filter and subsequently scaling a value of each of the coefficients of the filter based on the gain. The gain may be smoothed out over consecutive frames based on several adaptation schemes. | 10-04-2012 |
20120257762 | COMMUNICATION SYSTEM, RECEIVING APPARATUS AND COMMUNICATION METHOD - The present invention provides a communication system. When the audio signal in the wide band is input to a wireless microphone, the wireless microphone performs a balanced modulation processing to invert the frequency spectrum of the audio signal and transmits the audio signal with the inverted frequency. When a speaker apparatus receives the audio signal transmitted from the wireless microphone, the speaker apparatus cuts off a frequency component of the received audio signal in the frequency band of the infrared radiation noise produced by the external apparatus (infrared radiation noise band), performs a reverse balanced modulation processing to invert again the frequency spectrum of the audio signal having the frequency component in the infrared radiation noise band cut off, and outputs the audio signal with the frequency spectrum inverted again. | 10-11-2012 |
20120300954 | Noiseless Motor Apparatus and Denoise Driver - A motor apparatus includes a motor, a speaker for generating a denoise sound wave according to a speaker driving signal to offset a noise generated by the motor, and a driving device including a memory for storing a noise characteristic information of the motor, a control circuit for determining a rotation speed and a rotation angle of the motor to generate a rotation information and generating a noise simulation information according to the rotation information and the noise characteristic information, a motor driver for driving the motor according to the rotation information, and an active denoise circuit including a synthesizer for generating an inverted noise simulation signal according to the noise simulation information, and a speaker driver for generating the speaker driving signal according to the inverted noise simulation signal. | 11-29-2012 |
20120308021 | SPEAKER DAMAGE PREVENTION IN ADAPTIVE NOISE-CANCELING PERSONAL AUDIO DEVICES - A personal audio device, such as a wireless telephone, includes noise canceling circuit that adaptively generates an anti-noise signal from a reference microphone signal and injects the anti-noise signal into the speaker or other transducer output to cause cancellation of ambient audio sounds. A processing circuit monitors a level of the anti-noise signal, determines that the anti-noise signal may cause damage to the transducer and adjusts the generation of the anti-noise signal such that damage to the transducer is prevented. | 12-06-2012 |
20120308022 | SIGNAL PROCESSING DEVICE AND SIGNAL PROCESSING METHOD - There is provided a signal processing device s including a noise cancellation process clock generation unit configured to generate a noise cancellation process clock having a predetermined fixed frequency, a noise canceling unit configured to include a noise canceling filter operating based on the noise cancellation process clock and generating a noise canceling signal having a signal property of canceling an external noise component based on an input audio signal including the external noise component picked up by a microphone, and an addition unit superimposing the noise canceling signal generated by the filter on a digital audio signal, and a sampling rate conversion unit configured to rate-convert the input digital audio signal sampled at a clock in asynchrony with the noise cancellation process clock to a signal at a sampling frequency in synchrony with the noise cancellation process clock and to supply the rate-converted signal to the addition unit. | 12-06-2012 |
20120314880 | Stereo Headset Amplifier - A driver circuit includes a first driver amplifier that is configured to generate a first output in response to a first reference voltage input and a first audio input; a second driver amplifier that is configured to generate a second output in response to the first reference voltage and a second audio input; and a common mode (CM) amplifier, coupled to the first driver amplifier and the second driver amplifier. The CM amplifier is configured to generate an output in response to a second reference voltage input, the first reference voltage input being a divided version of the output. Gains of the first driver amplifier, second driver amplifier and the CM amplifier are equal. Noise at the output appears across a plurality of resistors coupled at the outputs of the first driver amplifier, second driver amplifier and the CM amplifier and cancels with respect to the output of the CM amplifier. | 12-13-2012 |
20120314881 | CONVERTIBLE FILTER - Apparatus and method for implementing a convertible filter in differing ones of its delay and weighting elements are powered through different power conductors, thereby enabling the convertible filter to be dynamically configured to be operable as different types of digital filter through selective provision of power to differing ones of the power conductors. | 12-13-2012 |
20130034236 | SIGNAL PROCESSING APPARATUS - A signal processing apparatus for generating a noise cancellation signal in accordance with a noise signal includes an inverting circuit and a selecting circuit. The inverting circuit is employed for inverting a first signal to generate an inverted first signal. The selecting circuit is coupled to the inverting circuit, and employed for selecting one of the first signal and the inverted first signal as an output signal. | 02-07-2013 |
20130039504 | METHODS AND APPARATUSES FOR ECHO CANCELATION WITH BEAMFORMING MICROPHONE ARRAYS - Embodiments include methods and apparatuses for sensing acoustic waves for a conferencing application. A conferencing apparatus includes a plurality of microphones oriented to cover a corresponding plurality of direction vectors and to develop a corresponding plurality of microphone signals. A processor is operably coupled to the plurality of microphones. The processor is configured to perform a beamforming operation to combine the plurality of microphone signals to a plurality of combined signals that is greater in number than one and less in number than the plurality of microphone signals. The processor is also configured perform an acoustic echo cancelation operation on the plurality of combined signals to generate a plurality of combined echo-canceled signals and select one of the plurality of combined echo-canceled signals for transmission. | 02-14-2013 |
20130039505 | AUDIO SIGNAL PROCESSING CIRCUIT - An audio-signal-processing circuit includes: a noise-detecting unit to detect presence or absence of noise in an audio signal generated based on an output from a tuner configured to receive a broadcast signal; a low-pass filter, having predetermined phase characteristics, to pass the audio signal having a band of frequencies lower than a predetermined frequency; a high-pass filter, having the predetermined phase characteristics, to pass the audio signal having a band of frequencies higher than the predetermined frequency; first- and second-output units to multiply the signals outputted from the low-pass and high-pass filters by first and second coefficients and output the multiplied signals, respectively; an adding unit to add the signals respectively outputted from the first and the second output units; and a coefficient control unit to, when the noise-detecting unit has detected the presence of noise, decrease the second coefficient below the first coefficient. | 02-14-2013 |
20130051574 | METHOD OF REMOVING MICROPHONE NOISE AND PORTABLE TERMINAL SUPPORTING THE SAME - A method of removing a microphone noise and a portable terminal supporting the same are provided. The portable terminal supporting removal of a microphone noise includes a microphone for collecting an audio signal, a controller for processing the audio signal collected by the microphone, a microphone signal line for transferring a microphone signal collected by the microphone to the controller, and a noise collecting circuit disposed at a neighboring region of the microphone signal line for collecting and providing a noise signal similar to a noise induced in the microphone signal line to the controller, wherein the controller controls such that the noise induced in the microphone signal line is removed based on the noise signal collected by the noise collecting circuit. | 02-28-2013 |
20130064382 | Pre-Configuration and Control of Radio Frequency Noise Cancellation - A noise-reduction system includes a noise-pattern predictor in communication with a noise-canceling module. In a more specific embodiment, the noise-reduction apparatus further includes an input collector in communication with the noise-pattern predictor. The input collector is coupled to a first module, such as a sensor, that provides information to the noise-pattern predictor to facilitate predicting noise in an accompanying signal environment and to provide a first signal in response thereto. In an illustrative embodiment, the first signal includes information indicating when an ignition system of a vehicle will turn on. The first signal further includes information indicating when a second signal transmitted from a cellular base station will affect noise in the signal environment. The second signal may include a burst in a cellular signal. | 03-14-2013 |
20130070935 | MULTI-SENSOR SIGNAL OPTIMIZATION FOR SPEECH COMMUNICATION - Systems, methods, and apparatus for facilitating multi-sensor signal optimization for speech communication are presented herein. A sensor component including acoustic sensors can be configured to detect sound and generate, based on the sound, first sound information associated with a first sensor of the acoustic sensors and second sound information associated with a second sensor of the acoustic sensors. Further, an audio processing component can be configured to generate filtered sound information based on the first sound information, the second sound information, and a spatial filter associated with the acoustic sensors; determine noise levels for the first sound information, the second sound information, and the filtered sound information; and generate output sound information based on a selection of one of the noise levels or a weighted combination of the noise levels. | 03-21-2013 |
20130077799 | ANTI-EAVESDROPPING DEVICE - An anti-eavesdropping device is described. The device comprises a receiving compartment for receiving an electronic device, a noise generator, and an EMI filter. The receiving compartment is sealable to minimize signal emissions from the interior to the exterior and from the exterior to the interior, and the noise generator is coupled with the receiving compartment and the EMI filter. The EMI filter is operatively coupled with the noise generator. | 03-28-2013 |
20130089211 | ACTIVE NOISE CONTROL DEVICE - The active noise control device for canceling out a target sound to be controlled in a target area for sound control includes: control sound output units each of which produces a control sound based on a wavefront control signal; and a wavefront control unit which provides the wavefront control signal to the corresponding one of the control sound output units, and the wavefront control unit generates the wavefront control signal to emit a synthesized sound from a virtual sound source toward the target area for sound control and cancel out the target sound in the target area for sound control, the synthesized sound being a sound synthesized from control sounds produced by the respective control sound output units, and the virtual sound source being located at a predetermined position | 04-11-2013 |
20130101129 | ACTIVE NOISE REDUCTION - A noise reducing sound reproduction system comprises a loudspeaker that is connected to a loudspeaker input path and that radiates noise reducing sound. A microphone is connected to a microphone output path and picks up the noise or a residual thereof An active noise reduction filter is connected between the microphone output path and the loudspeaker input path, and the active noise reduction filter comprises at least one shelving filter. | 04-25-2013 |
20130121499 | Frequency Domain Signal Processor For Close Talking Differential Microphone Array - A system and method for processing close talking differential microphone array (CTDMA) signals in which incoming microphone signals are transformed from time domain signals to frequency domain signals having separable magnitude and phase information. Processing of the frequency domain signals is performed using the magnitude information, following which phase information is reintroduced using phase information of one of the original frequency domain signals. As a result, high pass filtering effects of conventional differential signal processing of CTDMA signals are substantially avoided. | 05-16-2013 |
20130121500 | DRIVING OF PARAMETRIC LOUDSPEAKERS - A parametric loudspeaker system comprises a pre-compensator ( | 05-16-2013 |
20130129102 | ACOUSTIC ECHO CANCELLATION BASED ON ULTRASOUND MOTION DETECTION - A method includes receiving an ultrasound signal at an ultrasound receiver from an ultrasound transmitter. The method also includes detecting movement of at least one object based on the received ultrasound signal and at least one previously received ultrasound signal. The method further includes modifying a parameter of an acoustic echo canceller in response to the detected movement. | 05-23-2013 |
20130129103 | SPEAKER WITH MULTIPLE INDEPENDENT AUDIO STREAMS - The various embodiments relate generally to systems, devices, apparatuses, and methods for providing audio streams to multiple listeners, and more specifically, to a system, a device, and a method for providing independent listener-specific audio streams to multiple listeners using a common audio source, such as a set of loudspeakers, and, optionally, a shared audio stream. In some embodiments, a method includes identifying a first audio stream for reception at a first region to be canceled at a second region, and generating a cancellation signal that is projected in another audio stream destined for the second region. The cancellation signal and the first audio steam are combined at the second region. Further, a compensation signal to reduce the cancellation, signal at the first region can be generated. | 05-23-2013 |
20130156212 | METHOD AND ARRANGEMENT FOR NOISE REDUCTION - An object of the present invention is to improve the functionality of a noise reducer adapted to perform an active noise reduction process. | 06-20-2013 |
20130163771 | COMMUNICATION METHOD, COMMUNICATION SYSTEM, AND MAGNETIC RESONANCE APPARATUS - A communication method is provided. The communication method includes generating a pseudo background sound signal based on a gradient pulse control signal, performing a computation of subtracting the pseudo background sound signal from an acoustic signal having a sound signal and a background sound signal including a gradient coil drive sound signal, the acoustic signal obtained by an input device configured to receive the voice of a subject, and outputting sound based on a result of the computation, wherein a parameter of generating the pseudo background sound signal is controlled to reduce the difference resulting from the subtraction. | 06-27-2013 |
20130163772 | SOUND MASKING DEVICE AND SOUND MASKING METHOD - A sound masking device includes: a sound pick-up unit which picks up a sound, and which produces a picked-up sound signal based on the sound, a masking sound signal producing unit which produces a masking sound signal from the picked-up sound signal a sound emitting unit which emits a masking sound based on the masking sound signal, and an echo cancelling unit which performs an echo cancelling process on the picked-up sound signal by performing an adaptive filtering process on the masking sound signal, and by subtracting the filtered masking sound signal from the picked-up sound signal. The masking sound signal producing unit produces a masking sound signal having a level corresponding to an amplitude level of the picked-up sound signal which has subjected to the echo cancelling process. | 06-27-2013 |
20130177163 | NOISE REDUCTION USING A SPEAKER AS A MICROPHONE - During sound recording by a microphone, a recording device and method locate characteristics of noise by using a speaker as a second microphone to simultaneously receive sound, and then use the characteristics of noise for noise reduction of the received sound by the microphone, thereby improving the quality of sound recording. By using the speaker as a microphone to establish a microphone array with the existing microphone for noise reduction, no costs of additional microphones is required. | 07-11-2013 |
20130188800 | NOISE REDUCTION APPARATUS - A noise reduction apparatus includes a noise reduction amount calculator. The noise reduction amount calculator includes a difference calculator that obtains a difference between a level of the noise detected by a first noise detecting microphone and a level of the noise detected by a second noise detecting microphone when control sound is not output, a storage unit that stores the difference, an estimated noise value calculator that estimates a noise level that is to be detected by the second noise detecting microphone when the control sound is output, based on the level of the noise detected by the first noise detecting microphone when the control sound is output and the difference, and a reduction amount calculator that calculates a noise reduction amount on the noise reduction target position, based on the estimated noise value and the level of the noise detected by the second noise detecting microphone when the control sound is output. | 07-25-2013 |
20130216058 | NOISE SUPPRESSION DEVICE - A correction spectrum calculation unit | 08-22-2013 |
20130223639 | SIGNAL PROCESSING DEVICE, SIGNAL PROCESSING METHOD AND SIGNAL PROCESSING PROGRAM - The present invention compensates output variability caused by the difference in the performance of and the individual difference between converter devices when processing the signals inputted by means of a converter device, and performs highly-accurate signal processing. | 08-29-2013 |
20130243212 | ACTIVE NOISE INTERFERENCE SYSTEM - Provided is an active noise interference system. The active noise interference system may comprise a first microphone, a controller, a speaker, and an electrical power unit. The first microphone may be mounted within a first cavity defined by a tire-wheel system. The speaker may be mounted within the first cavity. The electrical power unit may be engaged with a component set comprising the first microphone, or the controller, or the speaker, or a combination thereof. The electrical power unit may be adapted to provide electrical power to the component set. | 09-19-2013 |
20130243213 | SELECTIVE ADAPTIVE AUDIO CANCELLATION ALGORITHM CONFIGURATION - Audio processing devices and methods. An ambient microphone picks up ambient sound and a voice microphone picks up a speaker's voice. The voice microphone is located farther from the speaker's mouth when a device is held to one side of the speaker's face than when held to the other side. A signal indicates whether an expected position of the handheld body is a position on a left side or right side of a speaker's face. Ambient sound in the voice signal is reduced by applying a first algorithm configuration selected to process voice signals with lower signal-to-noise ratio when the expected position in on one side of the speaker's face, and by applying a second sound cancellation algorithm configuration selected to process higher signal-to-noise ratios when the expected position is on the other side of the speaker's face. | 09-19-2013 |
20130251170 | Jointly Optimizing Noise Reduction and Voice Quality in a Mono or Multi-Microphone System - The present technology provides adaptive noise reduction of an acoustic signal using a sophisticated level of control to balance the tradeoff between speech loss distortion and noise reduction. The energy level of a noise component in a sub-band signal of the acoustic signal is reduced based on an estimated signal-to-noise ratio of the sub-band signal, and further on an estimated threshold level of speech distortion in the sub-band signal. In various embodiments, the energy level of the noise component in the sub-band signal may be reduced to no less than a residual noise target level. Such a target level may be defined as a level at which the noise component ceases to be perceptible. | 09-26-2013 |
20130259248 | ACTIVE ACOUSTIC NOISE REDUCTION TECHNIQUE - An acoustical noise reduction system which comprises a primary acoustic to electric transducer, digital signal processor (DSP), an electric to acoustic transducer, and a secondary acoustic to electric transducer is disclosed in the present invention. The active noise reduction system is located close to the noise source with the sound being sensed by a primary transducer before the noise enters the active noise reduction area. The system functions to generate an anti-noise cancellation sound wave with an acoustic propagation speed of approximately 330 m/sec and an electromagnetic propagation speed of approximately 3×10̂8 m/sec. | 10-03-2013 |
20130287217 | NOISE HANDLING DURING AUDIO AND VIDEO RECORDING - The disclosure is directed to techniques for noise handling in audio or video recording. Sounds that may be generated during the audio recording, such as by activation of switches, may appear as undesired artifacts in the recording. Techniques and apparatus are described whereby, when an undesired sound is generated, an inverse of the sound is applied to the sound, thereby canceling the unwanted sound from the recording. Further, the techniques can be adapted to many kinds of portable electronic devices having many kinds of switches and many kinds of undesirable sounds. | 10-31-2013 |
20130294614 | System and Method for Performing Voice Activity Detection - A Voice Activity Detection (VAD) algorithm provides a simple binary signal indicating the presence or absence of speech in a microphone signal. The VAD algorithm includes a first step of noise suppression which both estimates and removes (i.e., filters) ambient noise from the microphone signal to create a filtered signal. The magnitude of the filtered signal is then compared to a threshold in order to produce a VAD output signal. The threshold is dynamic and may be derived either from the filtered signal itself, or from a noise spectrum estimate calculated by the noise suppression step. | 11-07-2013 |
20130294615 | POP-NOISE REMOVING METHOD - Provided is a pop-noise removing method. The pop-noise removing method analyzes an acoustic noise, occurring when receiving digital broadcasting under a weak electric field environment, and reduces a pop-noise on the basis of the analyzed result, for transferring digital broadcasting with a minimized pop-noise to consumers. Accordingly, an output of the pop-noise of digital broadcasting can be minimized | 11-07-2013 |
20130294616 | METHOD AND SYSTEM FOR SPEECH ENHANCEMENT IN A ROOM - A system for speech enhancement in a room, having: a microphone arrangement with at least two spaced apart microphones for capturing audio signals from a speaker's voice, an acoustic beamforming unit for processing the captured audio signals in a manner so as to impart one of a plurality of different directional patterns to the microphone arrangement; a feedback cancellation unit for applying a feedback cancellation algorithm to the processed audio signals and for providing a feedback status signal indicating how close an acoustic feedback loop of the system is to feedback; an amplifier for amplifying the processed audio signals; a loudspeaker arrangement to be located in the room for generating sound according to the amplified audio signals; and a control for selecting the directional pattern imparted to the microphone arrangement as a function of the feedback status signal. | 11-07-2013 |
20130301842 | NOISE BURST ADAPTATION OF SECONDARY PATH ADAPTIVE RESPONSE IN NOISE-CANCELING PERSONAL AUDIO DEVICES - A personal audio device, such as a wireless telephone, generates an anti-noise signal from an error microphone signal and injects the anti-noise signal into the speaker or other transducer output to cause cancellation of ambient audio sounds. The error microphone is also provided proximate the speaker to provide an error signal indicative of the effectiveness of the noise cancellation. A secondary path estimating adaptive filter is used to estimate the electro-acoustical path from the noise canceling circuit through the transducer so that source audio can be removed from the error signal. Noise bursts are injected intermittently and the adaptation of the secondary path estimating adaptive filter controlled, so that the secondary path estimate can be maintained irrespective of the presence and amplitude of the source audio. | 11-14-2013 |
20130301843 | SUPPRESSION DEVICE FOR OUTDOOR NOISE IN INDOOR SPACE - The suppression device for outdoor noises in indoor space solves the technical problems on realizing better sound insulation effect within the room space and creating a quiet atmosphere for people's living environment. The structure includes an anti-noise sound source synchronized to and invert with outdoor noises. The circuit structure of suppression device includes a directional reception and processing circuit for outdoor noises, a attenuation control circuit, a multi-channel digital amplifier circuit, and loudspeaker being installed at the inlet of indoor noises. The directional reception and processing circuit for outdoor noises processes the noise signals collected from the outdoor environment and generates the inverted-phase signals, and then transmits them to the input terminal of attenuation control circuit. After being processed with attenuation by attenuation control circuit, the reverse-phase signals are sent out to input terminal of multi-channel digital amplifier circuit, which then enables the loudspeaker to generate noise compensation signals inverted to outdoor noises. This invention can provide the whole system with noise suppression capability over 28 dB. | 11-14-2013 |
20130301844 | Voice Signals Improvements in Compressed Wireless Communications Systems - Improvements in voice signals transmitted within communication systems are obtained by use of adaptive filters, front and rear microphones, noise cancelling systems and other means and methods. Disclosed embodiments include the use of directional microphones, primary inputs, secondary inputs, adaptive weight generators, canceller outputs to improve signal to noise ratios and other communication attributes. | 11-14-2013 |
20130308785 | ACTIVE NOISE REDUCTION - A noise reducing comprises a first microphone that picks up noise signal at a first location and that is electrically coupled to a first microphone output path; a loudspeaker that is electrically coupled to a loudspeaker input path and that radiates noise reducing sound at a second location; a second microphone that picks up residual noise from the noise and the noise reducing sound at a third location and that is electrically coupled to a second microphone output path; a first active noise reducing filter that is connected between the first microphone output path and the loudspeaker input path; and a second active noise reducing filter that is connected between the second microphone output path and the loudspeaker input path; in which the first active noise reduction filter is a shelving or equalization filter or comprises at least one shelving or equalization filter or both. | 11-21-2013 |
20130315409 | ACTIVE NOISE CONTROL APPARATUS - An active noise control apparatus includes a first active noise controller for generating a first canceling signal for a first noise type, a second active noise controller for generating a second canceling signal for a second noise type that is different from the first noise type, a mixer for mixing the first canceling signal and the second canceling signal into a mixed canceling signal, a canceling sound output unit for outputting a canceling sound based on the mixed canceling signal, and an amplitude suppressor for suppressing the amplitude of the second canceling signal depending on the amplitude of the first canceling signal. | 11-28-2013 |
20130329901 | CIRCUIT ARRANGEMENT AND METHOD FOR ACTIVE NOISE CANCELLATION - In an embodiment, a circuit arrangement for active noise cancellation, comprises a first input (E | 12-12-2013 |
20130343555 | System and Apparatuses that remove clicks for Game controllers and keyboards - A system that may include a mechanical element that is movable by a user; a microphone that is arranged to receive sound signals that comprise (a) sound signals of interest and (b) a mechanical noise resulting from a movement of the mechanical element; a mechanical noise reduction module that is arranged to receive or to generate a noise indication that is indicative of an actual or an expected generation of the mechanical noise and to attenuate the mechanical noise in response to the noise indication to provide an attenuated mechanical noise; and a communication module that is arranged to transmit output signals that are representative of the sound signals of interest and the attenuated mechanical noise. | 12-26-2013 |
20130343556 | Apparatus Including Microphone Arrangements - An apparatus includes first and second microphone arrangements, arranged to output first and second signals respectively and is operable in a first mode and a second mode. In the first mode, an output signal is generated based on the second signal and a third signal, where the second signal and, optionally, the first signal, can be used to compensate for ambient noise, for example, for noise cancellation when a telephone call is relayed through a speaker. In the second mode, an output signal is generated based on the first and second signals. In this manner, the combination of the first and second microphone arrangements provides a directional sensitivity that can pick up sound from a remote source, for example, in an audio or video recording session. The apparatus may include a sensor to allow automatic switching between one or more of modes, directional sensitivity patterns and types of recording session. | 12-26-2013 |
20140010383 | ELECTRONIC COMMUNICATION DEVICES WITH INTEGRATED MICROPHONES - Modern electronic devices are becoming smaller while the need to critically locate acoustic sensors or transducers, e.g., microphones, is increasing in order to provide improved intelligibility in adverse environments. The acoustic transducers can be used in arrays with their outputs processed in beam forming and noise cancellation algorithms. The use and creation of features on the surface of a small package to deal with the problem of achieving high performance solutions in a limited space are disclosed herein. For example, embodiments of electronic communication devices ( | 01-09-2014 |
20140023199 | NOISE REDUCTION USING DIRECTION-OF-ARRIVAL INFORMATION - Systems and methods of improved noise reduction using direction of arrival information include: receiving an audio signal from two or more acoustic sensors; applying a beamformer module to employ a first noise cancellation algorithm to the audio signal; applying a noise reduction post-filter module to the audio signal, the application of which includes: estimating a current noise spectrum of the received audio signal after the application of the first noise cancellation algorithm; using spatial information derived from the audio signal received from the two or more acoustic sensors to determine a measured direction-of-arrival by estimating the current time-delay between the acoustic sensor inputs; comparing the measured direction-of-arrival to a target direction-of-arrival; applying a second noise reduction algorithm to the audio signal in proportion to the difference between the measured direction-of-arrival and the target direction-of-arrival; and outputting a single audio stream with reduced background noise. | 01-23-2014 |
20140029758 | ACOUSTIC SIGNAL PROCESSING DEVICE, ACOUSTIC SIGNAL PROCESSING METHOD, AND ACOUSTIC SIGNAL PROCESSING PROGRAM - An acoustic signal processing device includes a frequency domain transform unit configured to transform an acoustic signal to a frequency domain signal for each channel, a filter coefficient calculation unit configured to calculate at least two sets of filter coefficients of a filter for each section having a predefined number of frames with respect to a sampled signal obtained by sampling the frequency domain signal transformed by the frequency domain transform unit for each frame such that the magnitude of a residual calculated based on a filter compensating for the difference in transfer characteristics between the channels of the acoustic signal is minimized, and an output signal calculation unit configured to calculate an output signal of a frequency domain based on the frequency domain signal transformed by the frequency domain transform unit and at least two sets of filter coefficients calculated by the filter coefficient calculation unit. | 01-30-2014 |
20140064507 | METHOD FOR ADAPTIVE AUDIO SIGNAL SHAPING FOR IMPROVED PLAYBACK IN A NOISY ENVIRONMENT - Provided is a method for adaptively enhancing an end-user's perceived quality, or quality of experience (QoE), of speech and other audio under ambient noise conditions. The method comprises the steps of determining the ambient noise characteristics on a continuous basis to capture the time varying nature of ambient noises, and adaptively determining the most optimal signal shaping to be applied to the audio/speech signal to produce the most appropriate enhancement to compensate for the ambient noise impairment. The method also comprises a signal shaping technique by using an infinite impulse response (IIR) filter that performs the signal modification with a low delay; a multi-level automatic gain control (AGC); and a controlled amplitude clipping module that assures samples are below a certain limit; and outputs the modified signal for playback through a loudspeaker or the like. | 03-06-2014 |
20140072131 | COMMUNICATION METHOD, COMMUNICATION SYSTEM, AND MAGNETIC RESONANCE APPARATUS - A communication method is provided. The communication method includes generating a pseudo background sound signal based on a gradient pulse control signal, performing a computation of subtracting the pseudo background sound signal from an acoustic signal having a sound signal and a background sound signal including a gradient coil drive sound signal, the acoustic signal obtained by an input device configured to receive the voice of a subject, and outputting sound based on a result of the computation, wherein a parameter of generating the pseudo background sound signal is controlled to reduce the difference resulting from the subtraction. | 03-13-2014 |
20140072132 | METHOD AND SYSTEM FOR REDUCING IMPULSIVE NOISE DISTURBANCE - FM and AM receivers in car environments require a noise blanker circuit or method to reduce the audible disturbances generated by impulse noise, such as ignition noise, in the audio signal. The invention proposes a combination of time-domain and frequency-domain processing to reduce the audible distortion. The time-domain processing interpolates the signal during the impulse noise bursts, and the frequency-domain processing disperses the remaining signal distortion over time, or relocates it to positions in time where it is attenuated by a windowing technique. | 03-13-2014 |
20140112489 | SIGNAL CANCELLATION - Signal cancellation is contemplated. The signal cancellation may include canceling a signal from another signal in order to facilitate further processing of the another signal. The signal cancellation may be beneficial within environments where the signal being canceled is intentionally introduced or its contents/characteristics are otherwise known prior to being exposed to the signal from which it is to be canceled. | 04-24-2014 |
20140140524 | WIND SUPPRESSION/REPLACEMENT COMPONENT FOR USE WITH ELECTRONIC SYSTEMS - Systems and methods to reduce the negative impact of wind on an electronic system include use of a first detector that receives a first signal and a second detector that receives a second signal. A voice activity detector (VAD) coupled to the first detector generates a VAD signal when the first signal corresponds to voiced speech. A wind detector coupled to the second detector correlates signals received at the second detector correlates signals received at the second detector and derives from the correlation wind metrics that characterize wind noise that is acoustic disturbance corresponding to at least one of air flow and air pressure in the second detector. The wind detector controls a configuration of the second detector according to the wind metrics. The wind detector uses the wind metrics to dynamically control mixing of the first signal and the second signal to generate an output signal for transmission. | 05-22-2014 |
20140153731 | ASYMMETRIC TEMPERATURE COMPENSATION OF MICROPHONE SENSITIVITY AT AN ACTIVE NOISE REDUCTION SYSTEM - Provided are a method and apparatus comprising an active noise reduction system. The active noise reduction system comprises an input transducer for transducing acoustic noise to a noise signal. The input transducer has a first sensitivity at a threshold temperature. The active noise reduction system includes circuitry that receives the noise signal and, in response, compensates for an effect by an ambient temperature on a second sensitivity of the input transducer by preventing the second sensitivity from being greater than the first sensitivity in response to a temperature deviation from the threshold temperature. | 06-05-2014 |
20140153732 | SIGNAL PROCESSING - The electronic device and a corresponding signal processing method disclosed herein reduces electromagnetic noise. To that end, the electronic device includes a delay line, an oscillator, and a modulator. The delay line generates a spread spectrum clock signal from an input clock signal, where a timing jitter and a period of jitter of the spread spectrum clock signal are controlled at each period of the spread spectrum clock signal based on a digital code. The oscillator uses the spread spectrum clock signal to generate a processing signal. The modulator modulates the processing signal as a function of an audio signal. | 06-05-2014 |
20140169576 | SPATIAL INTERFERENCE SUPPRESSION USING DUAL-MICROPHONE ARRAYS - Systems, processes, devices, apparatuses, algorithms and computer readable medium for suppressing spatial interference using a dual microphone array for receiving, from a first microphone and a second microphone that are separated by a predefined distance, and that are configured to receive source signals, respective first and second microphone signals based on received source signals. A phase difference between the first and the second microphone signals is calculated based on the predefined distance. An angular distance between directions of arrival of the source signals and a desired capture direction is calculated based on the phase difference. Directional-filter coefficients are calculated based on the angular distance. Undesired source signals are filtered from an output based on the directional-filter coefficients. | 06-19-2014 |
20140169577 | DRIVE CIRCUIT - As one embodiment of the present invention, provided is a drive circuit to which a three-value signal including a value representing zero is input, and that outputs two two-value signals that drive two drive elements such that the difference between values representing the two two-value signals corresponds to a value representing the input three-value signal, the drive circuit being characterized by the combination of the output two two-value signals when the value of the input three-value signal represents zero being determined in accordance with the input history of the three-value signal. The drive circuit may also be provided with a memory that records a flag value that is reversed in accordance with the input history of the input three-value signal, and the combination of the output two two-value signals being determined in accordance with the flag. | 06-19-2014 |
20140177858 | ECHO SUPPRESSION - Method, user device and computer program product for suppressing echo. An audio signal is output from a speaker. A microphone receives an audio signal, wherein the received audio signal includes an echo resulting from said outputted audio signal. A Finite Impulse Response filter estimate ĥ(t) is dynamically adapted in the time domain based on the outputted audio signal and the received audio signal to model an echo path h(t) of the echo in the received audio signal. At least one power response is determined from the filter estimate ĥ(t) and used to estimate the echo power of the echo in the received audio signal. The estimated echo power is used to apply echo suppression to the received audio signal, thereby suppressing the echo in the received audio signal. | 06-26-2014 |
20140177859 | ECHO SUPPRESSION - Method, user device and computer program product for suppressing echo. An audio signal is outputted from a speaker. A microphone receives an audio signal which includes echo resulting from said outputted audio signal. An echo path of the echo is modelled using a plurality of models. A first of the models is a FIR based model and a second of the models is different to the first model. The first model is used to determine a first model estimate of the echo power of a first component of the echo. The second model is used to determine a second model estimate of the echo power of a second component of the echo. The first and second model estimates of the echo power are combined. The combined estimate of the echo power is used to apply echo suppression to the received audio signal, thereby suppressing the echo. | 06-26-2014 |
20140177860 | DUAL OMNIDIRECTIONAL MICROPHONE ARRAY (DOMA) - A dual omnidirectional microphone array noise suppression is described. Compared to conventional arrays and algorithms, which seek to reduce noise by nulling out noise sources, the array of an embodiment is used to form two distinct virtual directional microphones which are configured to have very similar noise responses and very dissimilar speech responses. The only null formed is one used to remove the speech of the user from V | 06-26-2014 |
20140233747 | IMMERSIVE SOUND SYSTEM - Sound control and audio output systems and methods for an entertainment venue are described. The venue includes immersive display and sound elements. Prevention of acoustic reflections and level of audio immersion are enhanced with the described systems and techniques. | 08-21-2014 |
20140247949 | SIGNAL PROCESSING METHOD, SIGNAL PROCESSING DEVICE, AND SIGNAL PROCESSING PROGRAM - A signal processing method operating to generate a target blocked signal in which a target signal is suppressed by processing a mixed signal with a first set of adaptive filters, the method including estimating a noise contained in the mixed signal to determine an estimated noise, detecting a target signal contained in the mixed signal using a value that corrected similarity with a reference signal and the mixed signal by the estimated noise to determine a value corresponding to a reliability in the detection, and adaptively controlling a degree of coefficient update for first and second sets of adaptive filters according to the value corresponding to the reliability. | 09-04-2014 |
20140270219 | METHOD, APPARATUS, AND MANUFACTURE FOR BEAMFORMING WITH FIXED WEIGHTS AND ADAPTIVE SELECTION OR RESYNTHESIS - A method, apparatus, and manufacture for beamforming is provided. Parameters based on sets of pre-determined beamforming weights are stored. Each of the sets of pre-determined beamforming weights has a corresponding integral index number. Each input microphone signal is transformed to the frequency domain to provide a corresponding transformed signal. Each of the transformed signals includes a plurality of subbands. Next, an index number is determined representing an optimal set of beamforming weights for the transformed signals. Then, a set of beamforming weights is applied to each subband of each of the transformed signals to provide a weighted signal. The set corresponds to the determined index number. A time domain signal is then provided by combining each of the weighted signals. | 09-18-2014 |
20140286499 | Active Reduction of Harmonic Noise from Multiple Rotating Devices - A system and method for reducing noise caused by two or more rotating devices by taking in input signals with frequencies that are related to the rotation rates of the rotating devices, and causing one or more loudspeakers to produce sounds that are at about the same frequencies as the noise and of substantially opposite phase. There is a noise canceller associated with each rotating device. Each noise canceller includes a harmonic frequency computer that computes a harmonic frequency and provides the harmonic frequency to a harmonic sine wave generator that generates an output sine wave. Each nose canceller also has an adaptive filter that uses a sine wave to create a noise reduction signal that is used to drive one or more transducers with their outputs directed to reduce noise caused by the rotating devices. There is an overlap detector that compares the harmonic frequencies and, based on their proximity, alters the operation of one or more adaptive filters. | 09-25-2014 |
20140301557 | GAMING SYSTEM AND METHOD FOR DYNAMIC NOISE SUPPRESSION - A gaming system includes a central server linked to user stations defining gaming zones each defined as comprising one or more of said user stations. The server analyzes ambient conditions and generates baseline audio files for the user stations. The stations each include a gaming terminal, and sound receiving and emitting devices. The user stations sample ambient sounds and generate a representative audio file for analysis by the central server. The stations further enable users to select external sounds for local sound suppression, and can direct the sound emitting devices to emit sound waves for locally suppressing the selected external sounds. The stations extract user station-specific sound signatures from a combination of the local audio file and the baseline audio file, and direct the sound emitting devices to locally amplify sounds associated with the extracted user station-specific sound signatures. | 10-09-2014 |
20140314241 | FREQUENCY DOMAIN ACTIVE NOISE CANCELLATION SYSTEM AND METHOD - A frequency domain active noise cancellation system and method are provided that achieves superior active reduction of offending noise sources. The frequency-domain active noise cancellation identifies and cancels one or more of the strongest relatively narrow frequency bands in the power spectra of the offending sound sources. | 10-23-2014 |
20140321658 | Wireless Audio System - A wireless audio system is provided which incorporates a main device and a holder, for use with a listening device and an audio output device. The main device is capable of connecting wirelessly to an audio output device and generally includes a chip for sound transmission, a series of controls to command audio output device and a port. The holder connects to and receives an audio transmission from the main device at port. The holder transmits the audio received to an external listening device via a second connector. | 10-30-2014 |
20140334631 | NOISE REDUCTION - A method of reducing noise in an acoustic system, the method comprising at a first user terminal: receiving an audio signal from at least one further user terminal over a network; executing a communication client on a processing unit, the client configured so as when executed to: supply the audio signal to an audio signal processing module of the first user terminal, wherein the processing module processes the audio signal, whereby a level of gain is applied to the audio signal, and outputs a processed audio signal to a speaker; estimate a noise level of the audio signal and the processed audio signal and estimate the gain applied by the processing module taking into account both the noise level estimates; selectively apply a system gain reduction step to at least one of the audio signal and an audio signal received via a microphone, based on at least the estimated gain. | 11-13-2014 |
20140334632 | POP-UP NOISE SUPPRESSION IN AUDIO - Systems and methods for suppressing pop-up noise in an audio signal are disclosed. The system includes a driver circuit shared by a pin interface and a complementary pin interface. A control unit is coupled to the pin interface and the complementary pin interface. To activate the pin interface, the control unit is configured to first activate the driver output at the complementary pin interface. Once the complementary pin interface achieves a preset voltage, the driver output is switched to the pin interface by the control unit. In addition, the driver circuit can be calibrated for a DC offset on the complementary pin interface by re-using calibration data calculated at the pin interface. Further, DC correction signals can be provided from a pre-biasing circuit based on the calibration data of the driver circuit. | 11-13-2014 |
20140341384 | SOUND EMITTING AND COLLECTING APPARATUS, SOUND SOURCE SEPARATING UNIT AND COMPUTER-READABLE MEDIUM HAVING SOUND SOURCE SEPARATION PROGRAM - The present invention relates to a sound emitting and collecting apparatus including a sound collecting portion that captures surrounding sound using two microphones, and a sound emitting portion that emits sound from at least one speaker. The apparatus includes a sound source separating portion that extracts a target sound from a sound source in a predetermined direction, based on an input sound signal obtained by capturing surrounding sound using the two microphones, and an emission non-target sound removing portion that removes a non-target sound that is emitted from the speaker and captured by each of the microphones, based on sound source data for the sound emitting portion. The emission non-target sound removing portion is provided on a path that reaches the sound source separating portion. The emission non-target sound removing portion has a structure similar to an acoustic echo canceller, for example. | 11-20-2014 |
20140355775 | WIRED AND WIRELESS MICROPHONE ARRAYS - An acoustic noise canceling microphone arrangement and processor that uses a principal microphone and other microphones that may be incidentally or deliberately located in the vicinity of the principal microphone in order to derive an audio signal of enhanced signal-to-background noise ratio. In one implementation, the principal and incidental microphones comprise the microphone built into a mobile phone and the microphone built into a Bluetooth headset. | 12-04-2014 |
20140363009 | ACTIVE NOISE CANCELLATION METHOD FOR MOTORCYCLES - A Noise Cancellation Process for a motorcycle comprising an input audio source. Input audio source is combined in a mixer. Noise analyzer analyzes output from the mixer for amplitude and harmonic content. A replicate wave that is identical to the input audio source is created. The phase of the replicate wave is changed by − | 12-11-2014 |
20140369514 | Portable Electronic Device Directed Audio Targeted Multiple User System and Method - A computationally implemented system and method that is designed to, but is not limited to: electronically modulating two or more acoustic ultrasonic signals according to output information to be transmitted as two or more acoustic ultrasonic signals from two or more portable electronic device emitters of a portable electronic device; and electronically projecting said two or more acoustic ultrasonic signals from said portable electronic device emitters to produce a first set of one or more acoustic audio signals from a first set of said two or more acoustic ultrasonic signals at a first location and to produce a second set of one or more second acoustic audio signals from of a second set of said two or more acoustic ultrasonic signals at a second location. In addition to the foregoing, other method aspects are described in the claims, drawings, and text forming a part of the present disclosure. | 12-18-2014 |
20140369515 | ENVIRONMENTAL NOISE REDUCTION - A Noise Control Process for targeted environments is disclosed. According to one embodiment, an input audio source corresponding to sound received from a group of microphones placed at certain locations in the targeted environment, is converted to a digital signal via an analog to digital (A/D) convertor. The ND converted audio is analyzed for content to identify ambient noise. The frequency, amplitude and phase of the identified ambient noise is subsequently determined. A Noise correction sound wave is generated with negative phase of that corresponding to the identified ambient noise. The noise correction sound wave is added to the identified noise to create a noise corrected sound. | 12-18-2014 |
20140376731 | Noise Suppression Method and Audio Processing Device - One embodiment provides an audio processing device including: a first audio input receiver configured to receive mainly environment noise; a second audio input receiver configured to receive mainly a voice; a first frequency band difference calculator configured to calculate a first power difference, obtained through accumulation over plural frequency bands, of signals output from the first audio input receiver and the second audio input receiver; a first noise suppression amount calculator configured to calculate a first noise suppression amount based on the first power difference so as to increase the first noise suppression amount if the first power difference is relatively small; and a noise suppressor configured to perform a noise suppression for the signal that is output from the second audio input receiver based on the first noise suppression amount. | 12-25-2014 |
20150055787 | Instability Detection and Correction in Sinusoidal Active Noise Reduction System - A method for operating an active noise reduction system that is designed to reduce the harmonic or sinusoidal noise emanating from a rotating device, where there is an active noise reduction system input signal that is related to the frequency of the noise to be reduced, and where the active noise reduction system comprises one or more adaptive filters that output a generally sinusoidal noise reduction signal that is used to drive one or more transducers with their outputs directed to reduce the noise. Distortions of the noise reduction signal are detected. A distortion is based at least in part on differences between the frequency of the noise reduction signal and the frequency of the harmonic noise. The noise reduction signal is altered based on the detected distortion. | 02-26-2015 |
20150055788 | METHOD AND APPARATUS FOR WIND NOISE DETECTION - A method of processing digitized microphone signal data in order to detect wind noise. First and second sets of signal samples are obtained simultaneously from two microphones. A first number of samples in the first set which are greater than a first predefined comparison threshold is determined. A second number of samples in the first set which are less than the first predefined comparison threshold is determined. A third number of samples in the second set which are greater than a second predefined comparison threshold is determined. A fourth number of samples in the second set which are less than the second predefined comparison threshold is determined. If the first number and second number differ from the third number and fourth number to an extent which exceeds a predefined detection threshold, e.g. as determined by a Chi-squared test, then an indication that wind noise is present is output. | 02-26-2015 |
20150078568 | MICROPHONE DEVICE, MICROPHONE UNIT, MICROPHONE STRUCTURE, AND ELECTRONIC EQUIPMENT USING THESE - A microphone unit which can suppress collection of wind noise and minimize or eliminate digital signal processing has at least a microphone, a first acoustic transmissive material, and a second acoustic transmissive material, the first acoustic transmissive material is a fiber material in which fibers are intertwined with each other, the second acoustic transmissive material is a mesh-like member or a porous member having a plurality of holes, and the microphone is configured to be protected by the first acoustic transmissive material and the second acoustic transmissive material in this order. | 03-19-2015 |
20150078569 | NOISE CANCELLATION SYSTEM WITH LOWER RATE EMULATION - A noise cancellation system, comprising: an input for a digital signal, the digital signal having a first sample rate; a digital filter, connected to the input to receive the digital signal; a decimator, connected to the input to receive the digital signal and to generate a decimated signal at a second sample rate lower than the first sample rate; and a processor. The processor comprises: an emulation of the digital filter, connected to receive the decimated signal and to generate an emulated filter output; and a control circuit, for generating a control signal on the basis of the emulated filter output. The control signal is applied to the digital filter to control a filter characteristic thereof. | 03-19-2015 |
20150110283 | SYSTEM FOR CONTROLLING FAN NOISE - A system for controlling fan noise includes a fan, a sensor, a signal processing unit, a net structure, and a piezoelectric element. The fan has an airflow inlet and an airflow outlet. The sensor is disposed near the airflow outlet and is used for receiving a sound signal made by the fan. After the signal processing unit receives the sound signal sent by the sensor, the signal processing unit provides an inversed phase signal by analysis and computation. The net structure is disposed at the airflow inlet. The piezoelectric element is disposed on the net structure. When the piezoelectric element receives the inversed phase signal provided by the signal processing unit, the piezoelectric element vibrates the net structure, so that the net structure generates an inversed phase sound to offset a noise made by the fan. | 04-23-2015 |
20150110284 | NOISE REDUCTION IN MULTI-MICROPHONE SYSTEMS - An apparatus comprising: an input configured to receive at least three microphone audio signals, the at least three microphone audio signals comprising at least two near microphone audio signals generated by at least two near microphones located near to an desired audio source and at least one farmic audio signal generated by a farmic located further from the desired audio source; a first interference canceller module configured to generate a first processed audio signal based on a first selection from the near microphone audio signals; at least one further interference canceller module configured to generate at least one further processed audio signal based on at least one further selection from the at least three microphone audio signals; a comparator configured to determine from the first processed audio signal and the at least one further processed audio signal the audio signal with greater noise suppression. | 04-23-2015 |
20150117657 | AUDIO SPEAKER WITH SPATIALLY SELECTIVE SOUND CANCELLING - A system and method for reproducing audio sound. Audio sound, based on an audio signal, is emitted within a space comprising an audio beamwidth. Modulated ultrasonic sound energy based on a modulated ultrasonic sound signal is emitted in an ultrasonic sound direction within an ultrasonic beamwidth that is less than and within the audio beamwidth. The modulated ultrasonic sound signal is generated such that the emitted modulated ultrasonic sound energy creates an audible cancellation sound with an amplitude substantially equal to an amplitude of the audio sound at a point within the ultrasonic beamwidth so as to combine with and cancel the audio sound at the point by being substantially out of phase with the audio sound along the ultrasonic sound direction. | 04-30-2015 |
20150139433 | SOUND CAPTURE APPARATUS, CONTROL METHOD THEREFOR, AND COMPUTER-READABLE STORAGE MEDIUM - A noise signal is estimated based on a captured audio signal captured from a sound capture unit. It is determined whether the estimated noise signal thus estimated is in a noiseless state. If it is determined that the estimated noise signal is in the noiseless state, the captured audio signal is analyzed as a target sound signal, and a characteristic obtained by the analysis is learned and modeled, thereby generating a target sound model. | 05-21-2015 |
20150296294 | NOISE ESTIMATION IN A MOBILE DEVICE USING AN EXTERNAL ACOUSTIC MICROPHONE SIGNAL - A mobile device uses externals microphone signals to improve the estimate of background noise that it computes. In order to improve voice quality in a first signal that is produced by an internal microphone, the mobile device identifies an external microphone device within proximity of the mobile device. The mobile device establishes a wireless connection with the external microphone device. The mobile device receives a second signal from the external microphone device through the wireless connection. The second signal is produced by a microphone of the external microphone device. The mobile device generates a noise profile based on the second signal, and then suppresses background/ambient noise from the first signal based on the noise profile. Other embodiments are also described. | 10-15-2015 |
20150296298 | NOISE REMOVAL CIRCUIT OF WIRE HARNESS AND WIRE HARNESS ASSEMBLY INCLUDING THE SAME - The branch portion includes: a first circuit portion electrically connected to the main wire while extending to a leading end from a base end of the branch portion; a second circuit portion electrically connected to the main wire while extending to the leading end from the base end of the branch portion and electrically connected to the first circuit portion at the leading end of the branch portion; and a ground conductor that is disposed between the first circuit portion and the second circuit portion while extending to the leading end from the base end of the branch portion and has one end to be grounded and the other end to be opened. | 10-15-2015 |
20150319527 | WIND SUPPRESSION/REPLACEMENT COMPONENT FOR USE WITH ELECTRONIC SYSTEMS - Techniques associated with an acoustic vibration sensor are described, including a first detector that receives a first signal and a second detector that receives a second signal and a third signal, wherein the first signal comprises a skin surface microphone signal, a static equalization filter coupled to the first detector and configured to generate an equalized first signal, a voice activity detector coupled to the first detector, and a wind detector coupled to the second detector, the wind detector configured to correlate the second signal and the third signal and to derive from the correlation a plurality of wind metrics associated with a wind noise, the wind detector is further configured to determine a magnitude associated with the wind noise, to determine whether to suspend an activity of the system, and to determine a duration of time that the magnitude associated with the wind noise exceeds a threshold. | 11-05-2015 |
20150350771 | Machine and a System for Automatically Controlling Noise Reduction Feature of a Communication Device - A machine and a system for automatically controlling noise reduction feature of a communication device are disclosed. In one embodiment herein, a receiving module is configured to receive audio signals from the communication device, and a user input. The audio signals are processed by a microprocessor based on the user inputs and a predefined time interval. A comparator is provided for comparing the user input and the processed audio signals, to determine if the processed audio signal is greater or lesser than the user input and the noise reduction feature of the communication device is correspondingly enabled or disabled. | 12-03-2015 |
20150350779 | AUDIO SYSTEM AND METHOD FOR REDUCTION OF MICROPHONE DISTORTION - An audio system for reduction and/or elimination of distortion provides a microphone or instrument sound pick up for the various musical instruments and singers within the performance venue. The sound provided by the microphone or audio pick up is coupled to an amplifier, the output of which is coupled to a speaker system. In accordance with the present invention, a microphone is positioned within the output range of the speaker system and is coupled to one input of a comparator circuit. The remaining input of the comparator circuit is coupled to the microphones or pick ups of the musical instruments and singers. An additive device receives the output signal of the comparator and the originating signal from the microphones or pick ups to form a correcting audio signal which is applied to the amplifier. In an alternate embodiment of the present invention, an adaptive preamplifier is interposed between the originating microphones and audio pick ups and the amplifier. The adaptive preamplifier receives the output of the comparator and imposes alteration upon the signal processed through the preamplifier for application to the amplifier. In a still further alternate embodiment of the present invention, an adaptive amplifier includes a plurality of control elements which are capable of altering the transmission characteristic of the amplifier for the applied signals. The adaptive controls are coupled to and controlled by the comparator. | 12-03-2015 |
20150356964 | AUDIO SIGNAL PROCESSING CIRCUIT AND ELECTRONIC DEVICE USING THE SAME - An audio signal processing circuit and an electronic device are provided. A noise detection circuit determines if the first input audio signal and a second input audio signal contain noise. The noise cancellation circuit (i), when no noise is detected, outputs a first intermediate audio signal corresponding to the first input audio signal and a second intermediate audio signal corresponding to the second input audio signal without detected noise; (ii) when noise is detected, generates a third intermediate audio signal after performing a specific noise modification process upon the first input audio signal and the second input audio signal, and outputs the first intermediate audio signal including the third input audio signal and the second intermediate audio signal including the third input audio signal. A beamforming circuit performs a beamforming process according to a differential signal of the first intermediate audio signal and the second intermediate audio signal. | 12-10-2015 |
20150358730 | Approach for partially preserving music in the presence of intelligible speech - An audio processing system for a listening device includes an input device, a voice activity detector and a ratio-based attenuator. The input device is configured to receive a first audio signal emanating from an environment and including a signal of interest. The voice activity detector is configured to generate a control signal in response to the first audio signal. The ratio-based attenuator is configured to receive the control signal and determine whether the signal level of the first audio signal exceeds the signal level of an audio signal received from an audio playback device by at least a target difference. If so, then the audio level of the playback audio signal is maintained. Otherwise, the audio level of the playback audio signal is adjusted, where, at the adjusted value, the first signal level exceeds the playback signal level by at least the target difference. | 12-10-2015 |
20150358750 | DEVICE AND METHOD FOR TRACKING SOUND SOURCE LOCATION BY REMOVING WIND NOISE - Disclosed are a device and a method for tracking a sound source location by removing wind noise. The disclosed method for tracking a sound source by removing wind noise comprises the steps of: performing a Fourier transform for input signals of a time domain received by a plurality of microphones; detecting a first sound source section on the basis of an average power value of the Fourier-transformed input signals; detecting a second sound source section from which wind noise has been removed, on the basis of the first sound source section and a difference of power values of the input signals received by the microphones; and detecting a location of a sound source on the basis of the second sound source section and a phase difference of the input signals received by the plurality of microphones. | 12-10-2015 |
20150365759 | Exploiting Visual Information For Enhancing Audio Signals Via Source Separation And Beamforming - A system for exploiting visual information for enhancing audio signals via source separation and beamforming is disclosed. The system may obtain visual content associated with an environment of a user, and may extract, from the visual content, metadata associated with the environment. The system may determine a location of the user based on the extracted metadata. Additionally, the system may load, based on the location, an audio profile corresponding to the location of the user. The system may also load a user profile of the user that includes audio data associated with the user. Furthermore, the system may cancel, based on the audio profile and user profile, noise from the environment of the user. Moreover, the system may include adjusting, based on the audio profile and user profile, an audio signal generated by the user so as to enhance the audio signal during a communications session of the user. | 12-17-2015 |
20150365762 | ACOUSTIC PERIMETER FOR REDUCING NOISE TRANSMITTED BY A COMMUNICATION DEVICE IN AN OPEN-PLAN ENVIRONMENT - The amount of far-field noise transmitted by a primary communication device in an open-plan office environment is reduced by defining an acoustic perimeter of reference microphones around the primary device. Reference microphones generate a reference audio input including far-field noise in the proximity of the primary device. The primary device generates a main audio input including the voice of the primary speaker as well as background noise. Reference audio input is compared to main audio input to identify the background noise portion of the main audio signal. A noise reduction algorithm suppresses the identified background noise in the main audio signal. The one or more reference microphones defining the acoustic perimeter may be included in separate microphone devices placed in proximity to the main desktop phone, microphones within other nearby desktop telephone devices, or a combination of both types of devices. | 12-17-2015 |
20150373453 | MULTI-AURAL MMSE ANALYSIS TECHNIQUES FOR CLARIFYING AUDIO SIGNALS - Techniques for processing audio signals include removing noise from the audio signals or otherwise clarifying the audio signals prior to outputting the audio signals. The disclosed techniques may employ minimum mean squared error (MMSE) analyses on audio signals received from a primary microphone and at least one reference microphone, and to techniques in which the MMSE analyses are used to reduce or eliminate noise from audio signals received by the primary microphone. Optionally, confidence intervals may be assigned to different frequency bands of an audio signal, with each confidence interval corresponding to a likelihood that its respective frequency band includes targeted audio, and each confidence interval representing a contribution of its respective frequency band in a reconstructed audio signal from which noise has been removed. | 12-24-2015 |
20160012827 | SMART SPEAKERPHONE | 01-14-2016 |
20160021451 | NOISE CONTROL PANELS TO PROVIDE A NOISE-FREE ENVIRONMENT FOR INFANTS - According to embodiments of the invention, systems, methods and devices are directed to a noise control panel which serves as a sound barrier intended to provide a noise-free environment for infants. Various embodiments of the invention implement several novel features, including, in one embodiment, the noise control having a main body formed from a panel forming either a straight or curved upright sound barrier in front of a baby bed. Multiple panels may cover all sides of the bed and may have sound detectors incorporated therein. A vent serves to provide air circulation and/or conditioning if the panels are in a position enclosing the bed. | 01-21-2016 |
20160029121 | SYSTEM AND METHOD FOR MULTICHANNEL ON-LINE UNSUPERVISED BAYESIAN SPECTRAL FILTERING OF REAL-WORLD ACOUSTIC NOISE - A system for processing audio data comprising a linear demixing system configured to receive a plurality of sub-band audio channels and to generate an audio output and a noise output. A spatial likelihood system coupled to the linear demixing system, the spatial likelihood system configured to receive the audio output and the noise output and to generate a spatial likelihood function. A sequential Gaussian mixture model system coupled to the spatial likelihood system, the sequential Gaussian mixture model system configured to generate a plurality of model parameters. A Bayesian probability estimator system configured to receive the plurality of model parameters and a speech/noise presence probability and to generate a noise power spectral density and spectral gains. A spectral filtering system configured to receive the spectral gains and to apply the spectral gains to noisy input mixtures. | 01-28-2016 |
20160066087 | JOINT NOISE SUPPRESSION AND ACOUSTIC ECHO CANCELLATION - Systems and methods for joint noise and echo suppression using noise and echo subtraction processing are provided. The noise subtraction processing comprises receiving at least a primary acoustic signal, a secondary acoustic signal, and an echo reference acoustic signal. A desired signal component may be calculated and subtracted from the secondary acoustic signal to obtain a noise component signal. An adjusting coefficient for the noise component signal and an adjusting coefficient for the echo reference signal may be determined and applied. The noise component signal and echo reference signal may be subtracted from the primary acoustic signal to generate a noise and echo subtracted signal. An additional echo cancellation in the noise and echo subtracted signal may be carried out by applying a nonlinear processor. The non-linear processor is driven by at least a ratio of the noise and echo subtracted signal energy and the primary acoustic signal energy. | 03-03-2016 |
20160093281 | APPARATUS, SYSTEM AND METHOD FOR NOISE CANCELLATION AND COMMUNICATION FOR INCUBATORS AND RELATED DEVICES - Systems, apparatuses and methods for integrating adaptive noise cancellation (ANC) with communication features in an enclosure, such as an incubator, bed, and the like. Utilizing one or more error and reference microphones, a controller for a noise cancellation portion reduces noise within a quiet area of the enclosure. Voice communications are provided to allow external voice signals to be transmitted to the enclosure with minimized interference with noise processing. Vocal communications from within the enclosure may be processed to determine certain characteristics/features of the vocal communications. Using these characteristics, certain emotive and/or physiological states may be identified. | 03-31-2016 |
20160093282 | METHOD AND APPARATUS FOR ACTIVE NOISE CANCELLATION WITHIN AN ENCLOSED SPACE - A method of active noise cancellation and an associated system for cancelling noise within an enclosed space are described. The method involves detecting acoustic noise outside of the enclosed space. The method then involves generating a noise cancellation signal outside of the enclosed space, such that the acoustic noise is cancelled prior to the acoustic noise entering the enclosed space. | 03-31-2016 |
20160104501 | Method and Apparatus for Facilitating Conversation in a Noisy Environment - The present invention discloses a communication system to facilitate natural multiparty conversation in a noisy environment. The communication system may include a wireless headset. Each headset is connected to a wireless hub. In one embodiment, one of the headsets is integrated with the hub. Each participant in the conversation may wear the wireless headset. The speech from each non-hub headset is wirelessly communicated to the hub. The hub combines the speech from each participant into a conversation stream and transmits the conversation stream to all participants. | 04-14-2016 |
20160119713 | ADJUSTING AUDIO CONTENT BASED ON AUDIENCE - One embodiment provides a method, including but not limited to: identifying, using a data capture device, a listener; determining, using a processor, audio content is inappropriate; and executing, using a processor, an action, wherein the action prevents the inappropriate audio content from being audible. Other aspects are described and claimed. | 04-28-2016 |
20160125894 | Self-Organized Acoustic Signal Cancellation Over a Network - A system for self-organized acoustic signal cancellation over a network is disclosed. The system may transmit an acoustic sounding signal to an interfering device so that a channel measurement may be performed for a channel between the interfering device and an interferee device. The system may receive the channel measurement for the channel from the interfering device and also receive a digitized version of an audio interference signal associated with the interfering device. Based on the channel measurement and the digital version of the interference signal, the system may calculate a cancellation signal prior to the arrival of the original over-the-air audio interference signal that corresponds to the digital version of audio interference signal. The system may then apply the cancellation signal to an audio signal associated with the interferee device to remove the interference signal from the audio signal. | 05-05-2016 |
20160140948 | PRE-DISTORTION SYSTEM FOR CANCELLATION OF NONLINEAR DISTORTION IN MOBILE DEVICES - A pre-distortion system for improved mobile device communications via cancellation of nonlinear distortion is disclosed. The pre-distortion system may transmit an acoustic signal from a network to a device, wherein the acoustic signal includes a linear signal and a nonlinear cancellation signal that cancels at least a portion of nonlinear distortions created once a loudspeaker in the device emits the linear signal. Thus, when a loudspeaker of a mobile device is operating and nonlinear distortions are generated by the loudspeaker or adjacent components of the mobile device in close proximity to the loudspeaker, the pre-distortion system may create one or more nonlinear cancellation signals in the network. The nonlinear cancellation signal may be combined with the linear signal sent to the loudspeaker to cancel the nonlinear distortion signal created by the loudspeaker emitting acoustic sounds from the linear signal. Thus, the nonlinear cancellation signal becomes a pre-distortion signal. | 05-19-2016 |
20160163306 | ELECTRONIC APPARATUS AND CONTROL METHOD THEREOF AND AUDIO OUTPUT SYSTEM - One or more exemplary embodiments provide an electronic apparatus and control method thereof and an audio output system, the method including receiving a noise signal at a first audio output apparatus of a plurality of audio output apparatuses from the at least one first audio output apparatus; generating a noise removing signal based on the noise signal; and providing the noise removing signal to the at least one first audio output apparatus, and providing an audio signal to a second audio output apparatus of the plurality of audio output apparatuses. | 06-09-2016 |
20170234179 | USE OF ACTIVE NOISE SYSTEM | 08-17-2017 |
20170234180 | VEHICLE NOISE SUPPRESSION METHOD | 08-17-2017 |
20170236507 | ACTIVE NOISE CONTROL AND CUSTOMIZED AUDIO SYSTEM | 08-17-2017 |
20190147844 | COMPENSATION MEANS FOR A LOUDSPEAKER SYSTEM AND LOUDSPEAKER SYSTEM | 05-16-2019 |
20190147846 | PLANAR ELEMENT FOR THE ACTIVE COMPENSATION OF NOISE IN AN INTERIOR ROOM AND ANTI-NOISE MODULE THEREFOR | 05-16-2019 |