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NOISE OR DISTORTION SUPPRESSION

Subclass of:

381 - Electrical audio signal processing systems and devices

Patent class list (only not empty are listed)

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Class / Patent application numberDescriptionNumber of patent applications / Date published
381940200 Spectral adjustment 74
381940500 Soft switching, muting, or noise gating 34
381940700 Using signal channel and noise channel 18
381940400 Interpolation 9
381940800 Peak limiting or pulsive noise compensation 6
381940900 Feedforward circuitry for transducer compensation 5
20100239105ACTIVE NOISE REDUCTION ADAPTIVE FILTERING - An active noise reduction system that reduces the incidence of divergence in the presence of high amplitude interfering noise. A limited frequency range threshold is established.09-23-2010
20100278355Feedforward-Based ANR Adjustment Responsive to Environmental Noise Levels - A compression circuit of a device providing feedforward-based ANR monitors the electric signal output by a feedforward microphone for indications of the voltage levels of the electric signal output by the feedforward microphone ceasing to have a linear relationship with the acoustic levels of the sounds detected by the feedforward microphone. As long as there are no such indications, the compression circuit relays a signal to a feedforward anti-noise generator that is at least representative of the electric signal output by the feedforward microphone in which the sounds represented are not compressed, perhaps by directly relaying the signal output by the feedforward microphone as feedforward reference sounds. However, in response to detecting such indications, the compression circuit compresses the sounds represented by the signal output by the feedforward microphone prior to providing those sounds to the feedforward anti-noise generator as feedforward reference sounds, perhaps by attenuating the signal output by the feedforward microphone.11-04-2010
20100166216Nonlinear Signal Processing - A method of determining a signal input to a transducer from the signal output from the transducer, the method comprising receiving as input at a processing means the signal output from the transducer, processing the signal output from the transducer in dependance upon a value for the linear gain coefficient of the transducer and a value for the quadratic nonlinear coefficient of the transducer, to determine the signal input to the transducer.07-01-2010
20120076322MICROPHONE - There is provided a microphone that can suppress vibration noise stemming from mechanical vibrations and that outputs a collective signal having superior quality.03-29-2012
20080226098DETECTION AND SUPPRESSION OF WIND NOISE IN MICROPHONE SIGNALS - To reliably and consistently detect desirable sounds, a system detects the presence of wind noise based on the power levels of audio signals. A first transducer detects sound originating from a first direction and a second transducer detects sound originating from a second direction. The power levels of the sound are compared. When the power level of the sound received from the second transducer is less than the power level of the sound received from the first transducer by a predetermined value, wind noise may be present. A signal processor may generate an output from one or a combination of the audio signals, based on a wind noise detection.09-18-2008
381940600 Hum or ground loop 2
20090086994METHOD FOR REDUCING AUDIO NOISE OF DISPLAY AND DRIVING DEVICE THEREOF - A method for reducing audio noise of a display is provided. A horizontal synchronization signal, a reference signal and a substrate voltage signal are generated. The reference signal has a preset width at high level status. The status transition of the substrate voltage signal is based on each scan line corresponding to the horizontal synchronization signal. In each period of the substrate voltage signal, the status transition of the raising and falling edges is based on the high level status of the reference signal, and the transition timings of the raising edges and the falling edges are advanced or delayed based on a reference value of the high level status of the reference signal.04-02-2009
20120263316ELECTRONIC DEVICE WITH INCREASED IMMUNITY TO AUDIO NOISE FROM SYSTEM GROUND CURRENTS - According to some aspects, an electronic device adapted to provide audio output via an audio system. The electronic device includes an audio jack adapted to be coupled to the audio system. The audio jack includes a line-out for sending audio signals to the audio system and a ground return line. The electronic device also includes a ground resistor between the ground return line and a ground node. The ground resistor has a resistance selected to reduce ground current on the ground return line when the electronic device is being charged without significantly adversely affecting the quality of the audio output.10-18-2012
Entries
DocumentTitleDate
20130044895MULTI-CHANNEL CLASS-D AUDIO AMPLIFIER WITH PLANAR INDUCTORS - An apparatus for providing an audio signal to drive a speaker system includes first and second audio channels. The first audio channel has a first class-D amplifier for receiving an input signal, and a first reconstruction filter for receiving an output from the first class-D amplifier and reconstructing therefrom an output audio signal for driving the speaker system. The second audio channel has a second class-D amplifier for receiving an input audio signal, and a second reconstruction filter for receiving an output from the second class-D amplifier and reconstructing therefrom an output audio signal for driving the speaker system. The first and second reconstruction filters have corresponding first and second planar inductors, with the second planer inductor being magnetically coupled to the first planar inductor.02-21-2013
20130028440NOISE REDUCING SOUND REPRODUCTION SYSTEM - A noise reducing sound reproduction system and method is disclosed, in which an input signal is supplied to a loudspeaker by which it is acoustically radiated. The signal radiated by the loudspeaker is received by a microphone that is acoustically coupled to the loudspeaker via a secondary path and that provides a microphone output signal. The microphone output signal may be subtracted from a useful-signal to generate a filter input signal. The filter input signal may be filtered in an active noise reduction filter to generate an error signal. The useful-signal may be subtracted from the error signal to generate the loudspeaker input signal, and the useful-signal may be filtered by one or more low-pass filters prior to subtraction from the microphone output signal.01-31-2013
20080247568UPLINK NOISE CANCELLATION - A system comprising audio logic adapted to convert captured sound into an audio signal. The system also comprises transmission logic which causes noise to be added to the audio signal. The system further comprises processing logic adapted to at least partially remove the noise from the audio signal by subtracting a noise waveform from the audio signal to produce a result signal. The processing logic generates the noise waveform using power level information associated with the transmission logic. The transmission logic transmits the result signal to another electronic device.10-09-2008
20100074455USE OF NON-AUDIBLE BAND TO RELAY INFORMATION FOR ECHO CANCELLATION IN A DISTRIBUTED MEDIA SYSTEM - Particular embodiments provide for attenuating one or more microphone signals in a teleconferencing system upon detecting a non-audible signal. A far end voice signal is received from a sound source. A non-audible signal is added to the far end voice signal to create a composite signal, which is provided to one or more speakers. The speakers output the composite signal and the non-audible signal are detected in the composite signal after the composite signal is received at one or more microphones. The non-audible signal allows an attenuator to attenuate a microphone signal including the composite signal from a particular microphone in response to the detected non-audible signal to reduce far end echo.03-25-2010
20130034242MIC AUDIO NOISE FILTERING - This document discusses, among other things, a MIC audio noise filtering system configured to detect MIC audio noise at a pole of a four-pole audio jack using first and second comparators. The MIC audio noise detection system can include first and second comparators configured to compare a value of the pole to respective first and second thresholds and to provide an output indicative of the comparisons and a detection circuit configured to count changes in the output over a first period of time and to detect MIC audio noise at the pole of the four-pole audio jack using the count.02-07-2013
20130034243Method and Arrangement For Noise Cancellation in a Speech Encoder - The present invention relates to a method and arrangement for an improved noise canceller in a speech encoder. Sound signals are captured at a primary microphone in conjunction with a reference microphone. An adaptive shadow filter is adapted to the correlation between the signals captured at the primary and reference microphones. Further, a diffuse-noise-field detector is introduced which detects the presence of diffuse noise. When the diffuse-noise-field detector detects diffuse noise, the filter coefficients of the adapted shadow filter is used by a primary filter to cancel the diffuse noise at the signal captured by the primary microphone. Since the filter coefficients of the adapted shadow filter only is used for cancellation when diffuse noise is solely detected, cancellation of the speech signal is avoided.02-07-2013
20130077802SIGNAL PROCESSING METHOD, INFORMATION PROCESSING DEVICE AND SIGNAL PROCESSING PROGRAM - To suppress both noise having an unknown characteristic and noise having a known characteristic, 03-28-2013
20130077801DISTORTION CONTROL TECHNIQUES AND CONFIGURATIONS - Embodiments of the present disclosure provide distortion control techniques and configurations. An apparatus includes an input module configured to receive an audio signal, a clipping module configured to clip the audio signal and a control module configured to allow a user to control a clipping threshold. The clipping module is configured to clip the audio signal based on the clipping threshold. The clipping threshold is a voltage level corresponding with an amplitude level of the audio signal and the clipping threshold is a variable clipping threshold configurable by the user to correspond with multiple amplitude levels of the audio signal. Other embodiments may be described and/or claimed.03-28-2013
20100104112Variable Noise Masking During Periods of Substantial Silence - Methods and systems for masking audio noise are disclosed. One apparatus includes a silence detector configured to detect a period of substantial silence in an audio signal; a masking noise source operably coupled to the silence detector, the masking noise source configured to generate a noise signal in response to the silence detector detecting the period of substantial silence; and at least one combining device operably coupled to the masking noise source, the at least one combining device configured to contribute to combining the audio signal and the noise signal. A method includes detecting a period of substantial silence in an audio signal; and combining masking noise with the audio signal during the period of substantial silence.04-29-2010
20090154726System and Method for Noise Activity Detection - A noise activity detector includes a circuit for calculating average energy in a critical bandwidth, a circuit for determining a threshold function, a circuit for generating a dynamic modification of the threshold function, a circuit for identifying frequency components of the signal having energy that is above threshold values determined by the threshold function, and to determine a first average energy value representing an average energy of the identified frequency components with energy above the threshold, a circuit for identifying frequency components of the signal having energy that is below threshold values determined by the threshold function, and to determine a second average energy value representing an average energy of the identified frequency components with energy below the threshold, a circuit for offsetting at least one of the first and second average energy values, a circuit for comparing the resultant average energy values with one another, and a circuit for indicating the presence of noise activity if the first average energy value is below the second average energy value.06-18-2009
20120183154USE OF SENSORS FOR NOISE SUPPRESSION IN A MOBILE COMMUNICATION DEVICE - Techniques are described herein that use sensors (e.g., microphones) for noise reduction in a mobile communication device. For example, one technique enables a first sensor that is initially configured to be a speech sensor to be used as a noise reference sensor. This technique also enables a second sensor that is initially configured to be a noise reference sensor to be used as a speech sensor. Another technique enables a primary sensor and/or a secondary sensor in a handset of a mobile communication device to be used as a speech sensor while a sensor in a headset of the mobile communication device is used as a noise reference sensor, or vice versa. In yet another technique, a secondary sensor in a mobile communication device is configured to be a directional sensor.07-19-2012
20130051578NETWORK SIGNAL RECEIVING SYSTEM AND NETWORK SIGNAL RECEIVING METHOD - The disclosure provides a network signal receiving system and a network signal receiving method. The network signal receiving system comprises: a high pass filter, a canceller, and an adder. The high pass filter is utilized for performing a high pass filtering operation for an audio data signal to output at least a signal corresponding to transitions of the audio data signal, wherein the audio data signal is synchronized with a network data signal. The canceller is coupled to the high pass filter, and utilized for generating a noise cancelling signal according to the at least a signal output by the high pass filter. The adder is coupled to the canceller, utilized for receiving the network data signal and the noise cancelling signal, so as to use the noise cancelling signal to cancel at least a noise in the network data signal, which is corresponding to the at least a signal.02-28-2013
20100266141Processing an Audio Signal - A method and apparatus for processing an audio signal to enhance the perceived lower frequency content of the audio signal when played through an audio output device, includes an input configured to receive an audio input signal, a processor configured to filter the audio input signal to produce a high frequency signal and a low frequency signal, generate an enhancement signal by producing higher frequency harmonics from the low frequency signal, including a process of self convolution, and combine the high frequency signal with the enhancement signal to produce an output signal; and an output configured to receive the output signal and produce an audio output.10-21-2010
20090304203METHOD AND DEVICE FOR BINAURAL SIGNAL ENHANCEMENT - Various embodiments for components and associated methods that can be used in a binaural speech enhancement system are described. The components can be used, for example, as a pre-processor for a hearing instrument and provide binaural output signals based on binaural sets of spatially distinct input signals that include one or more input signals. The binaural signal processing can be performed by at least one of a binaural spatial noise reduction unit and a perceptual binaural speech enhancement unit. The binaural spatial noise reduction unit performs noise reduction while preferably preserving the binaural cues of the sound sources. The perceptual binaural speech enhancement unit is based on auditory scene analysis and uses acoustic cues to segregate speech components from noise components in the input signals and to enhance the speech components in the binaural output signals.12-10-2009
20120219163APPARATUS FACILITATING EFFECTIVE COMMUNICATION IN NOISE-PRONE ENVIRONMENTS - Methods and arrangements for providing soundproof audio communication from a mask assembly. A mask assembly includes a soundproof mask, the soundproof mask being adapted to cover a human nose and mouth. A microphone disposed in a portion of the mask and a venting arrangement provides fluid communication from an interior of the mask to an exterior of the mask. A communication connection which provides audio communication between the microphone and a processor.08-30-2012
20130058496Audio Noise Optimizer - The specification and drawings present a new method, apparatus and software related product (e.g., a computer readable memory) for implementing reducing audio noise in audio related communications (e.g., telephone communications) by analyzing audio signals from/to users (or user equipments) in a close proximity to one another, e.g., e.g., in the same geographic location or for calls under the same cell. Also pre-recorded signals or real-time broadcasting signals may be used for identifying and canceling/reducing unwanted noises in various audio related communications.03-07-2013
20130058497DIGITAL SPEAKER DRIVING APPARATUS - A digital sound system suitable for a digital speaker device to directly convert 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.03-07-2013
20120224718SIGNAL PROCESSING METHOD, INFORMATION PROCESSING APPARATUS, AND STORAGE MEDIUM FOR STORING A SIGNAL PROCESSING PROGRAM - To sufficiently suppress an impact sound in a noisy signal. The impact sound in the noisy signal is suppressed. For this, the impact sound is detected in the noisy signal. It is characterized in that phase information of the detected impact sound is processed by using the phase information of a signal other than the impact sound in the noisy signal so that an amount of change in the phase information is reduced.09-06-2012
20120224717AUDIO CABLE CAPABLE OF INCREASING GAIN AND FILTERING NOISE - An audio cable capable of increasing gain and filtering noise includes a signal amplifier arranged between an input end and an output end of the audio cable. The signal amplifier includes at least a primary coil and a secondary coil. The number of turns of the secondary coil is greater than that of the primary coil. A mutual inductance between the primary coil and the secondary coil can transform the level of voltage, current and impedance of the signal amplifier to generate an output gain greater than 1, so as to amplify the audio signal. Moreover, the primary and secondary coils have a characteristic of blocking fast current variation; thereby the higher the gain magnification, the more stable is the sound quality and the smaller the noise becomes.09-06-2012
20130064392SINGLE PROCESSING METHOD, INFORMATION PROCESSING APPARATUS AND SIGNAL PROCESSING PROGRAM - A signal processing method includes: analyzing a noisy signal that is supplied as an input signal; generating mixed noise information by mixing a plurality of noise information about a noise to be suppressed based on the result of said analysis of the noisy signal; and suppressing the noise using the mixed noise information.03-14-2013
20090010452ADAPTIVE NOISE GATE AND METHOD - Speech noise gating for gain control functions such as automatic gain control, dynamic range compression, and digital volume control scales the gain control function gain according to the ratio of noise energy to input energy.01-08-2009
20120114141HOWLING CANCELLER - A howling canceller is adapted to an acoustic system having a speaker and first and second microphones. The speaker and the first microphone form a first acoustic feedback loop; the speaker and the second microphone form a second acoustic feedback loop. The howling canceller includes a howling suppressing unit for performing suppression processing in such a way that: frequency components at which howling is possibly occurring are detected in each of the sound signals picked up by the first and second microphones; the detected frequency components of the sound signals picked up by the first and second microphones are compared with each other on a per-frequency basis and a frequency component having larger power is detected; and based on the comparison results, the larger power frequency component of at least one of the sound signals picked up by the first and second microphones is suppressed.05-10-2012
20120114140SYSTEM AND METHOD FOR A NOISE REDUCTION CONTROLLER IN A COMMUNICATION DEVICE - A system and method control the level of applied noise reduction, the level of noise reduction being influenced by monitoring audio signals, analyzing audio signal components, bandwidth of background noise, user preferences and other factors.05-10-2012
20120114139METHODS AND SYSTEMS FOR SUPPRESSING NOISE - The present invention relates to a suppressing noise system applied in a mobile device, comprises: at least two microphones are used for respectively transmitting a first audio signal with noise and a second audio signal with noise; a pre-processing unit is coupled to the at least two microphones for oversampling the first and second audio signals, downsampling the sampled first and second audio signals, and then generating a first adjusted signal and a second adjusted signal; and a suppressing noise device is coupled to the pre-processing device for filtering noise in the first and second adjusted signals once again, and outputting a third audio signal.05-10-2012
20090196433Howling Suppression Apparatus and Computer Readable Recording Medium - A howling suppression apparatus suppresses a howling caused in an acoustic system including a sound collection device and a sound emission device. An estimation part generates an estimated signal by estimating a feedback sound reaching the sound collection device from the sound emission device. An adjustment part generates an estimated signal by adjusting the estimated signal. A spectrum subtraction part generates an acoustic signal using a result of subtracting a frequency spectrum of the estimated signal from a frequency spectrum of an acoustic signal. A filter part generates an acoustic signal by suppressing a component of a frequency band including a howling frequency F among the acoustic signal. An acoustic signal in which the acoustic signal is amplified by an amplifier is supplied to the sound emission device.08-06-2009
20110299703MINIATURE TRANSDUCER ASSEMBLY WITH INTEGRATED DE-COUPLING COILS - The present invention relates to a miniature transducer assembly for a wireless portable terminal. The miniature transducer assembly of the present invention comprises a transducer unit comprising a number of voice coils for displacing a diaphragm of said transducer unit. Moreover, the transducer assembly comprises at least one de-coupling coil for avoiding interference between the transducer unit and an antenna of the wireless portable terminal. In order to reduce the dimensions of the transducer assembly at least one de-coupling coil forms an integral part of a lead-out wire from of a voice coil.12-08-2011
20110033064Differential mode noise cancellation with active real-time control for microphone-speaker combinations used in two way audio communications - An audio host device has an electrical interface having a speaker contact, a microphone contact, and a reference contact. The reference contact is shared by a microphone and a speaker. The reference contact is also directly coupled to a power return plane of the audio host device. A difference amplifier is provided, having a cold input and a hot input. The hot input is coupled to the microphone contact. A variable attenuator circuit is also provided having an input coupled to receive a signal from a sense point for the reference contact, and an output coupled to the cold input of the difference amplifier. A controller has an output coupled to control the variable attenuator. Other embodiments are also described and claimed.02-10-2011
20100098265ACTIVE NOISE REDUCTION ADAPTIVE FILTER ADAPTATION RATE ADJUSTING - A method for determining leakage factors or adaptation rates, or both, for adaptive filters in an active noise reduction system. The leakage factor or adaptation rate, or both, may vary depending on a parameter of an input reference signal. The parameter may include one or more of reference signal input frequency, rate of change of reference input signal frequency, if a predetermined triggering condition exits, or if a predetermined event has occurred.04-22-2010
20090154727SYSTEMS AND METHODS FOR SUPPRESSING RADIO INTERFERENCE FROM A NOISE SOURCE VIA ACTIVE FILTERING - Systems and methods are provided for suppressing radio interference from a noise source having an operating frequency. One system includes memory for storing a threshold signal strength, a re-configurable filter for selectively filtering signals of a harmonic of the operating frequency, and a controller. The controller is configured to compare a signal strength of a received signal to the threshold signal strength and turn ON the re-configurable filter if the signal strength of the received signal is less than or equal to the threshold signal strength. A method includes determining a noise signature for the motor vehicle and associating a signal strength threshold with the noise signature. The method further includes comparing a signal strength of a tuned radio station to the signal strength threshold and turning ON the filter if the signal strength is less than or equal to the signal strength threshold.06-18-2009
20090080674HOWLING CONTROL APPARATUS AND ACOUSTIC APPARATUS - It is an object of the present invention to provide a howling suppressing apparatus and an acoustic apparatus which can suppress the howling component effectively without suppressing a periodic component other than the howling component. The howling control apparatus comprises a signal separating unit 03-26-2009
20090147968SOUND INPUT DEVICE - A sound input device includes a differential microphone, configured to receive sound including noise, and generate a first signal in accordance with the sound; a detector, configured to detect the noise, and generate a second signal in accordance with the detected noise; and a controller, configured to control at least one of suppression of high-frequency components of the first signal and changing of a frequency band to be suppressed of the first signal based on the second signal.06-11-2009
20110261975LOW COST NOISE FLOOR REDUCTION - A method and system to reduce the noise floor of a communications system is disclosed. The system may be incorporated into any device that provides binary samples from a datastream, such as a cordless telephone system. The system is configured to determine a number of bits of the binary samples that are affected by noise. The system is then able to remove the noise by setting those bits to a fixed value. The fixed value may depend on whether the sample is positive or negative. The value to set may be chosen so that the least significant bits of each sample come as close as possible to 0 for that particular numerical representation system. The system can be integrated with other known signal processing methods.10-27-2011
20080310650ACTIVE NOISE REDUCING DEVICE - An active noise reducing device includes processing circuit includes a sine wave generator for generating a sine wave having a specific frequency, a cosine wave generator for generating a cosine wave having the same frequency as that of the sine wave, and two one-tap digital filters for processing the outputs from the generators. The processing circuit also has two coefficient updating sections, which output a sum of outputs from the digital filters. Updating sections update respective coefficients of the filters based on a sum of this output from the updating sections and respective inputs to the updating sections, and the respective outputs from the generators. The noise reducing device also has an adjusting circuit for adjusting the phase and amplitude of an output from the processing circuit, the adjusting circuit thus generates a control signal of opposite phase and equal in amplitude to original noise, so that random noise such as load noise can be reduced.12-18-2008
20100329481ACOUSTIC CORRECTION APPARATUS AND ACOUSTIC CORRECTION METHOD - According to one embodiment, an acoustic correction apparatus includes: a signal obtaining module configured to obtain an acoustic signal from a target space including an object and an external space; a signal output module configured to output to the target space a measurement signal; a coefficient identifying module configured to identify, on the basis of a response acoustic signal, a correction coefficient of a correction filter that reduces a resonance frequency component of a resonance in the object; a filtering module configured to use the correction filter, and filter the signal provided to the object; a noise cancelling module configured to remove, on the basis of the acoustic signal, a noise component comprised in the acoustic signal from the filtered signal; and an output module configured to output the acoustic signal, from which the noise component is removed by the noise cancelling module, to the object.12-30-2010
20100119079APPRATUS AND METHOD FOR PREVENTING NOISE - Provided are an apparatus and method for preventing noise. The apparatus estimates a noise signal from a signal transformed into a frequency domain, uses the estimated noise signal to estimate the amplitude of the frequency-domain signal according to a frequency band, and then calculates a phase difference according to a frequency band and eliminates or prevents noise from the amplitude-estimated frequency-domain signal based on the calculated phase difference according frequency band.05-13-2010
20120106756SYSTEM AND METHOD FOR A NOISE REDUCTION SWITCH IN A COMMUNICATION DEVICE - A switch system and novel method control the application of noise reduction upon a signal.05-03-2012
20100124341NOISE CONTROL DEVICE - A noise control device according to the present invention includes: a signal processor that detects a noise outputted from a noise source, and generates a control signal based on the noise; a control acoustic system that generates a control sound for canceling the noise, based on the control signal outputted from the signal processor; and an output correction section that corrects the control signal outputted from the signal processor, in a frequency band for which a noise control process time τ, which is a time period from when the noise is outputted from the noise source to pass through the signal processor and the control acoustic system to when the control sound reaches the control point, is larger than a noise transfer time T, which is a time period from when the noise is outputted from the noise source to when the noise reaches the control point via the noise transfer system (τ>T).05-20-2010
20110170708PORTABLE AUDIO DEVICE HAVING REDUCED SENSITIVITY TO RF INTERFERENCE AND RELATED METHODS - A portable audio device having reduced sensitivity to RF interference over a predetermined frequency range from an adjacent mobile wireless communications device may include a portable housing, a battery carried thereby, a recharging power input connected to the battery, a digital signal input, and an audio analog signal output. A digital-to-analog converter (DAC) may be carried by the portable housing and powered by the battery for converting a selected digital audio file from a memory into an analog audio signal. An audio analog amplifier may be connected between the DAC and the audio analog signal output. A first RF filter(s) may be connected to the recharging power input, and a second RF filter(s) may be connected to the audio analog signal output, both for reducing RF interference over the predetermined frequency range from the adjacent mobile wireless communications device.07-14-2011
20110170707NOISE SUPPRESSING DEVICE - A noise suppressing device is provided for suppressing noise of a first audio signal to generate a second audio signal. In the noise suppressing device, a noise acquisition unit acquires a plurality of noise components which are different from each other. A noise suppression unit generates each suppression component by suppressing each noise component from the first audio signal, thereby providing a plurality of suppression components different from each other in correspondence to the plurality of the noise components. A signal generation unit generates the second audio signal by summing the plurality of the suppression components that are provided from the noise suppression unit.07-14-2011
20090285410Restoring audio signals - Methods, systems, and apparatus, including computer program products, for restoring audio signals. A data sequence of samples representing an audio signal is received. Multiple filter coefficients are defined for a filter, and a current sample in the data sequence is selected to be processed. The filter coefficients are updated based on a previous sample preceding the current sample in the data sequence and a filtered value determined by the filter for the previous sample. A filtered value for the current sample is determined using the filter with the updated filter coefficients. The filtered value of the current sample is used to determine whether the current sample has been corrupted by impulsive noise, for example, a crackle.11-19-2009
20110200208APPARATUS AND METHOD FOR TRANSMITTING SOUND THROUGH NONLINEAR MEDIA - Provided are an apparatus and method for transmitting sound through a nonlinear medium. The apparatus includes a pre-distorter for previously distorting a sound signal to compensate for distortion to be caused by a frequency characteristic of the nonlinear medium in a transmission process of the sound signal, a sigma-delta modulator for modulating the pre-distorted sound signal into a signal having two signal levels, a high-frequency modulator for multiplying the modulated signal by a carrier wave having a higher frequency than an audio frequency band to shift the modulated signal to a carrier frequency band and generate a high-frequency modulated signal, and a transmitter for converting the high-frequency modulated signal into a sound wave signal suited to be transmitted through the nonlinear medium and transmitting the sound wave signal.08-18-2011
20090169032APPARATUS AND METHOD FOR DESIGNING SOUND COMPENSATION FILTER IN PORTABLE TERMINAL - A method and an apparatus for designing a sound compensation filter of a portable terminal are provided. The method includes synchronizing a signal input through a microphone of the system and a test signal, estimating a loss interval of the synchronized signal, compensating for a frame signal delayed by a signal loss in a time axis when the signal loss of the estimated loss interval is greater than a threshold and restoring the loss interval of the signal.07-02-2009
20090003627Hearing apparatus with passive input level-dependent noise reduction - A hearing apparatus and in particular a hearing device is to be provided, in which interference noises are to be reduced however as natural an acoustic image as possible is consequently retained. To this end, a hearing apparatus with a first signal processing channel, into which a noise reduction device is integrated and a second signal processing channel, which has the same input as the first signal processing channel and into which no noise reduction device, but instead a level limitation device is integrated, is proposed. An adding device adds the output signals of both signal processing channels to form an overall output signal. A passive input level-dependent noise reduction can thus be realized, with which quiet signals can be heard again despite the noise reduction.01-01-2009
20080279392REDUCING SOUND PRESSURE OF NOISE - A system comprising converter logic that introduces noise to a signal. The system also comprises amplifier logic that reduces a sound pressure associated with the noise by amplifying the signal prior to providing the signal to the converter logic and de-amplifying the signal after providing the signal to the converter logic.11-13-2008
20130216065SMART WATCH WITH AUTOMATIC VOICE RECORDING AND ALARM - A wearable accoutrement such as a wristwatch records noises within a wearer's vicinity, and white noises may be filtered out to output pure human voices. The voice recording feature can be activated manually or automatically during a “panic mode” as indicated by a loud noise or sudden biological changes such as an increase in heart rate or body temperature. The accoutrement can also monitor other environmental elements such as light, motion and audio and may be paired with a wireless phone such that noise from a stressful event can be sent to a remote server which processes the data. A motion sensor in the accoutrement may also activate an audible alarm in the event of physical trauma to the wearer to induce an attacker to flee.08-22-2013
20080212794AUDIO PROCESSING APPARATUS - A signal processing apparatus includes sound collecting elements, a noise detector for detecting a level of noise in a low-frequency band of audio signals output from the sound collecting elements, a noise reduction unit for reducing the noise in the audio signals in accordance with a signal output from the noise detector, a converter for converting the audio signals output from the noise reduction unit into pieces of audio data corresponding to channels including a low-frequency channel and other channels, a low-frequency channel controller for controlling a level of the audio data corresponding to the low-frequency channel in accordance with the level of the noise detected using the noise detector, and a level controller for controlling the level of the audio data of the low-frequency channel output from the low-frequency channel controller and levels of the pieces of audio data corresponding to the other channels output from the converter.09-04-2008
20120070016SOUND QUALITY CORRECTING APPARATUS AND SOUND QUALITY CORRECTING METHOD - A sound quality correcting apparatus includes: an input module; a feature quantity calculator; a score calculator; a modulation spectrum power calculator; a score corrector; and a signal corrector. The input module receives an input audio signal. The feature quantity calculator calculates feature quantities of the input audio signal for each of a plurality of first intervals having a certain time length. The score calculator calculates a score value for each the first interval based on the feature quantities. The modulation spectrum power calculator calculates a power value, at a certain modulation frequency, of a modulation spectrum of the input audio signal. The score corrector corrects score values in the plurality of first intervals that belong to a second interval if a power value calculated in the second interval is larger than or equal to a certain value. The signal corrector corrects the audio signal based on the score values.03-22-2012
20080317261Wind Noise Reduction Device - In a wind noise reduction device that reduces wind noise contained in an input sound signal to generate a corrected sound signal, when a predetermined band including the band of the wind noise is a first band and a predetermined band higher in frequency than the first band is a second band, the wind noise reduction device includes: a first corrector that has a signal generator generating, based on a sound signal (i) contained in the input sound signal and lying in a band higher in frequency than the first band, a sound signal (ii) lying in the first band and different from a sound signal (iii) contained in the input sound signal and lying in the first band, and that generates a first corrected sound signal based on the sound signal (ii) generated by the signal generator; a second corrector that reduces the signal level of a sound signal (iv) contained in the input sound signal and lying in the second band to thereby generate a second corrected sound signal as a sound signal (v) having the wind noise reduced and lying in the second band; and a corrected sound signal outputter that outputs the corrected sound signal based on the first and second corrected sound signals.12-25-2008
20090034754Apparatus for Automatically Mixing Audio Signals in a Predetermined Manner - A recorded voice message having a first length and a background sound having a second length longer than the first length are received. The first length of the recorded voice message is determined. The level of a portion of the background sound is lowered, the lowered portion having a length that is substantially the same as the first length. The recorded voice message and the lowered portion of the background sound are interleaved. The length of the background sound is adjusted to the first length plus a third length.02-05-2009
20100061568SIGNAL PROCESSING USING SPATIAL FILTER - A device and method processing microphone signals from at least two microphones is presented. A first beamformer processes the signals from the microphones and provides a first beamformed signal. A power estimator processes the signals from the microphones and the first beamformed signal from the first beamformer in order to generate, in frequency bands, a first statistical estimate of the energy of a first part of an incident sound field. A gain controller processes said first statistical estimate in order to generate in frequency bands a first gain signal, and an audio processor for processing an input to the signal processing device in dependence of said generated first gain signal. The invention provides a new and improved noise reduction device and noise reduction method for use in the signal processing in devices processing acoustic signals, e.g. microphone devices.03-11-2010
20110222709System and Method For Reducing Radio Frequency Interference Between A Wireless Communication Device And A Speaker - A device and method are provided that reduce interference between a wireless communication device and a speaker. Generally speaking, a microphone input is monitored for detecting noise created by the interference. If noise is detected, a power transmission level of the wireless device is reduced from a standard power transmission level.09-15-2011
20110228951SOUND PROCESSING APPARATUS, SOUND PROCESSING METHOD, AND PROGRAM - A sound processing apparatus includes a target sound emphasizing unit configured to acquire a sound frequency component by emphasizing target sound in input sound in which the target sound and noise are included, a target sound suppressing unit configured to acquire a noise frequency component by suppressing the target sound in the input sound, a gain computing unit configured to compute a gain value to be multiplied by the sound frequency component using a gain function that provides a gain value and has a slope that are less than predetermined values when an energy ratio of the sound frequency component to the noise frequency component is less than or equal to a predetermined value, and a gain multiplier unit configured to multiply the sound frequency component by the gain value computed by the gain computing unit.09-22-2011
20110228950HEADSET LOUDSPEAKER MICROPHONE - A headset system which may be utilized for various forms of communication and multimedia. The headset system may include a number of earpieces which may be configured to change its operation state based on a position of the earpiece relative to a user's ear and a desired use. The earpiece may be further configured to provide noise cancellation based on its position and operational state.09-22-2011
20110142254NOISE REMOVAL SYSTEM - A system for noise removal is coupled to a signal unit that provides a digital signal. The noise removal system includes a transformation module to transform the digital signal into an f-digital signal, a threshold filter to generate a noiseless signal from the f-digital signal based on a threshold profile, and a signal synthesizer to provide a gain to the noiseless signal and to transform the noiseless signal into an output signal.06-16-2011
20090220105METHOD FOR COMPENSATING FOR CHANGES IN REPRODUCED AUDIO SIGNALS AND A CORRESPONDING DEVICE - An apparatus and method for compensating for changes, which result on an original signal (09-03-2009
20120033827SIGNAL PROCESSING DEVICE AND SIGNAL PROCESSING METHOD - A signal processing device includes a noise analysis unit for analyzing a frequency component of a noise signal obtained by converting a collected sound into an electrical signal, a plurality of filtering units for carrying out predetermined filtering operations on the noise signal on the basis of an analysis result, and an output control unit for temporally varying a synthesis rate of outputs of the plurality of filtering units according to a change in the analysis result of the noise analysis unit. When the analysis result of the noise analysis unit changes, one filtering unit starts a predetermined filtering operation by characteristics different from those of other filtering units that carry out predetermined filtering operations on the noise signal according to the change in the analysis result of the noise analysis unit.02-09-2012
20090316928INCORPORATING PRIOR KNOWLEDGE INTO INDEPENDENT COMPONENT ANALYSIS - The quality of sound recorded from a plurality of people speaking at the same time is improved by incorporating prior knowledge into an independent component analysis (ICA) separating algorithm. More particularly, prior knowledge is defined as a probability distribution according to some prior situation (e.g., prior distribution of people in a room). A mixture of sounds (e.g., mixture of voices) from a plurality of sources (e.g., people) captured by one or more recording devices (e.g., microphones) is separated into individual components (e.g., individual voices from respective people) by applying an maximum a posteriori (MAP) ICA algorithm which incorporates prior knowledge of the respective sources (e.g., location of sources) directly into the MAP ICA algorithm thereby allowing recovery of independent underlying sounds associated with individual sources from the mixture. Therefore, incorporating prior knowledge into an ICA algorithm provides sound quality substantially equal to existing ICA systems, but at reduced computational complexity.12-24-2009
20090316929SOUND CAPTURE SYSTEM FOR DEVICES WITH TWO MICROPHONES - The perceptual sound quality of desired audio signals (e.g., human voice) captured by an electronic device (e.g., cell phone) are improved by reducing ambient noise according to an algorithm that acts upon audio signals captured from a front and rear direction. More particularly, audio signals captured by two directional microphones pointing in opposite directions (e.g., a front microphone which receives audio signals from a forward direction and a rear microphone which receives audio signals from a rear direction) are classified and subsequently enhanced (e.g., unwanted signals are suppressed) according to a probability of their source (e.g., front, rear, or noise) thereby providing an improved perceptual sound recording than each microphone individually. The resultant signals provide decreased noise since the contribution of the front and rear microphones are taken into consideration and the signal from the more relevant (e.g., in the direction from which sound is coming) microphone is utilized.12-24-2009
20100150375Determination of the Coherence of Audio Signals - Embodiments of the invention disclose computer-implemented methods, systems, and computer program products for estimating signal coherence. First, a sound generated by a sound source is detected by a first microphone to obtain a first microphone signal and by a second microphone to obtain a second microphone signal. The first microphone signal is filtered by a first adaptive finite impulse response filter to obtain a first filtered signal. The second microphone signal is filtered by a second adaptive finite impulse response filter, to obtain a second filtered signal. The coherence of the first filtered signal and the second filtered signal is determined based upon the filtered signals. The first and the second microphone signals are filtered such that the difference between the acoustic transfer function for the transfer of the sound from the sound source to the first microphone and the transfer of the sound from the sound source to the second microphone is compensated in the first and second filtered signals.06-17-2010
20120140950DIFFERENTIAL MICROPHONE CIRCUIT - An apparatus for a portable electronic device for receiving a jack of a headset, the jack including a set of lines, the set of lines including at least one audio line, a ground signal and a microphone signal line, the apparatus comprising a set of switches for receiving the ground signal line and the microphone signal line and a sensing circuit for reducing induced noise from the headset, wherein the sensing circuit is located between the set of switches and the microphone signal line and ground signal line.06-07-2012
20100189280SIGNAL ANALYSIS DEVICE, SIGNAL CONTROL DEVICE, ITS SYSTEM, METHOD, AND PROGRAM - A signal analysis device includes: a signal reception unit which receives an input signal containing a plurality of constituent elements; and a signal analysis unit which generates analysis information indicating the relationship between the constituent elements from the input signal.07-29-2010
20100189281 METHOD AND AN APPARATUS FOR PROCESSING AN AUDIO SIGNAL - An apparatus for processing an audio signal and method thereof, comprising receiving a downmix signal comprising at least one normal object signal, and bitstream including object information determined when the downmix signal is generated; extracting extension type identifier indicating whether the downmix signal further comprises a multi-channel object signal, from extension part of the bitstream; when the extension type identifier indicates that the downmix signal further comprise multi-channel object signal, extracting first spatial information from the bitstream; and, transmitting at least one of the first spatial information and the second spatial information; wherein the first spatial information is determined when a multi-channel source signal are downmixed into the multi-channel object signal, wherein the second information is generated using the object information and mix information, are disclosed.07-29-2010
20100239103FASTER CADZOW DENOISING BASED ON PARTIAL EIGENVALUE DECOMPOSITION - Certain aspects of the present disclosure relate to a method for speeding up the Cadzow iterative denoising algorithm as a part of the Finite Rate of Innovation (FRI) processing and for decreasing its computational complexity.09-23-2010
20100254544AMPLIFIER CIRCUIT OF CAPACITOR MICROPHONE - The invention provides an amplifier circuit of a capacitor microphone of which the noise resistance against noise of a supply voltage is enhanced. In an amplifier circuit of a capacitor microphone of the invention, while a noise component of a supply voltage is applied to one inversion input terminal of an operational amplifier of an amplification portion through a parasitic capacitor existing between an external power supply wiring and an external wiring that are adjacent to each other, the problem noise component of the supply voltage is applied to the other non-inversion input terminal by capacitive coupling to an internal power supply wiring. Therefore, the noise component is cancelled at the operational amplifier.10-07-2010
20090041263Echo Suppressing Method and Apparatus - Coefficient generator generates a crosstalk coefficient that is a predetermined value and that is used to calculate the amount of crosstalk of an echo. Converter uses either the output signal of a sound pickup device or the signal obtained by subtracting the output signal of an echo canceller from the output signal of the sound pickup device as a first signal, corrects the first signal based on the crosstalk coefficient generated in coefficient generator, and produces a near-end signal obtained by removing the echo from the first signal.02-12-2009
20110026734System for Suppressing Wind Noise - A voice enhancement logic improves the perceptual quality of a processed voice. The voice enhancement system includes a noise detector and a noise attenuator. The noise detector detects a wind buffet and a continuous noise by modeling the wind buffet. The noise attenuator dampens the wind buffet to improve the intelligibility of an unvoiced, a fully voiced, or a mixed voice segment.02-03-2011
20110026733DEVICE FOR CANCELLING BACKGROUND NOISE AND METHOD THEREOF - A method for cancelling background noise of an audio device comprises determining characteristic values of an audio signal to construct a characteristic signal reflecting a change trend of the audio signal, multiplying the determined characteristic signal with the audio signal to construct a multiplication signal, and amplifying the multiplication signal.02-03-2011
20100303255METHOD FOR NOISE REMOVAL OF EAR PHONE IN PORTABLE TERMINAL AND APPARATUS THEREOF - Provided is a method of removing an earphone noise of a portable terminal includes: recognizing a connection of an earphone through an interface unit; applying power to a mike bias port in case the earphone is recognized; sensing a signal which indicating a detachment of the earphone from the interface unit during applying power to the mike bias port; and discharging the power of the mike bias port when the detachment occurs.12-02-2010
20100232621Signal separator, method for determining output signals on the basis of microphone signals, and computer program - A signal separator, a method and computer product for determining a first output signal describing an audio content of a useful-signal source in a first microphone signal, and for determining a second output signal describing an audio content of the useful-signal source in a second microphone signal.09-16-2010
20110243349Noise Estimation - A method and apparatus are provided for estimating the noise spectrum of an audio signal occupying a certain frequency range. The amplitude of the audio signal is measured at only a subset of the frequency range having a low expected signal to noise ratio at the time of measuring such that the measured amplitude is indicative of noise amplitude at that subset of the frequency range. A predefined noise spectral shape is then adapted by fitting to the noise amplitude so as to form the estimated noise spectrum. The noise spectrum so estimated is used to remove interference noise from the audio signal.10-06-2011
20090067642NOISE REDUCTION THROUGH SPATIAL SELECTIVITY AND FILTERING - A signal processor uses input devices to detect speech or aural signals. Through a programmable set of weights and/or time delays (or phasing) the output of the input devices may be processed to yield a combined signal. The noise contributions of some or each of the outputs of the input devices may be estimated by a circuit element or a controller that processes the outputs of the respective input devices to yield power densities. A short-term measure or estimate of the noise contribution of the respective outputs of the input devices may be obtained by processing the power densities of some or each of the outputs of the respective input devices. Based on the short-term measure or estimate, the noise contribution of the combined signal may be estimated to enhance the combined signal when processed further. An enhancement device or post-filter may reduce noise more effectively and yield robust speech based on the estimated noise contribution of the combined signal.03-12-2009
20100177910SOUND REPRODUCING APPARATUS USING IN-EAR EARPHONE - First, in a state where a pair of earphones 07-15-2010
20090034755AMBIENT NOISE CANCELLATION FOR VOICE COMMUNICATIONS DEVICE - A system and method for reducing or entirely canceling background or ambient noise from a voice transmission from a communications device. A communications device, such as a mobile telephone, is configured with an ambient noise compensation signal generator that is connected between a microphone and a mixer. The original output of the microphone and a compensation signal generated by the ambient noise compensation signal generator are mixed together prior to being passed to a transmitter. In one embodiment a buffer is provided between the microphone and the mixer to help synchronize the timing of the signals to be mixed. In another embodiment a second microphone is employed to detect ambient noise.02-05-2009
20100150376ECHO SUPPRESSING APPARATUS, ECHO SUPPRESSING SYSTEM, ECHO SUPPRESSING METHOD AND RECORDING MEDIUM - An echo suppressing apparatus operable with a sound output device for outputting sound based on a reference signal and a sound processing device for processing an observed signal based on a received sound, the echo suppressing apparatus includes: an echo removal section for removing an echo component of the observed signal which is presumed on the basis of both the observed signal and the reference signal; a ratio calculation section for calculating a power ratio of the observed signal to the reference signal; a correction amount calculation section for calculating, based on the power ratio, a correction amount for the observed signal after removal; a correction section for correcting, based on the calculated correction amount, the observed signal after removal, so as to suppress a residual echo remaining in the observed signal after removal; and an output section for outputting the corrected observed signal to the sound processing device.06-17-2010
20090214055Noise cancelling device and noise cancelling method - A noise cancelling device includes a microphone; an opposite-phase circuit configured to invert a phase of a sound signal that is obtained by the microphone, thereby obtaining an opposite-phase sound signal; and a speaker configured to receive the opposite-phase sound signal that is obtained by the opposite-phase circuit, and to output a sound. The microphone is disposed at a point which is a point other than a specified listening point, the listening point being located a predetermined distance from the speaker, and at which, as a sound-pressure level of the sound that was output from the speaker, a sound-pressure level that is substantially the same as a sound-pressure level which is obtained at the listening point is obtained.08-27-2009
20090214054Noise Eliminating Apparatus - A noise eliminating apparatus includes a first microphone, a second microphone and a signal processing unit, the signal processing unit includes a linear prediction filter and a noise resynthesis filter, the linear prediction filter receives an output signal of the first microphone, predicts the output signal of the first microphone by linear prediction and generates a prediction signal, and the noise resynthesis filter is an adaptive filter which receives, as a main input signal, a first difference signal obtained by subtracting one of the output signal of the first microphone and the prediction signal from the other, receives, as an error signal, a second difference signal obtained by subtracting one of an output signal of the second microphone and an output signal of the noise resynthesis filter itself from the other, and updates a filter coefficient so that the error signal is minimized.08-27-2009
20090052691Howling Suppressing Apparatus - A howling suppressing apparatus includes: a detecting unit configured to detect howling of input audio signals; a plurality of filters configured to apply a filter process sequentially to the audio signals to be output; and a setting unit configured to set a filter coefficient for suppressing the howling detected by the detecting unit for a filter among the plurality of filters, in which filter no filter coefficient for suppressing howling is set, and set a filter coefficient for suppressing the howling detected by the detecting unit for any one of the plurality of filters, if filter coefficients for suppressing howling are set in all of the plurality of filters, based on the detection result from the detecting unit.02-26-2009
20090052690Method for Stabilizing an Adaptive Algorithm and Device for Carring Out Said Method - A method of estimating an unknown transfer function (H) which comprises an input signal (x) and an actual output signal (y), wherein an estimated output signal (ŷ) is generated in an adaptive process (02-26-2009
20100008519Noise suppressing device, noise suppressing method and mobile phone - There is provided a noise suppressing device, for suppressing a noise component contained in a sound, including: at least two sound receiving parts receiving sounds from a plurality of directions containing a sound from a direction of a given sound source and converting the sounds to digital sound signals in a time domain, respectively; an estimating part acquiring both direction information on a direction of the given sound source and distance information on a distance from the given sound source based upon the digital sound signals converted by the sound receiving parts, and estimating a component value of a noise component contained in the signal by use of the direction information and the distance information; and a controlling part acquiring a control value of a suppression amount for controlling a range of a direction of the digital sound signals.01-14-2010
20110150239SIGNAL PROCESSING CIRCUIT - A signal processing circuit includes: an AD converter configured to quantize an input signal, whose amplitude changes in accordance with temperature, within a set voltage range and convert the quantized input signal into a digital signal; and a setting circuit configured to set the voltage range so as to be wider when the input signal is greater in amplitude in accordance with the temperature and so as to be narrower when the input signal is smaller in amplitude in accordance with the temperature.06-23-2011
20110069848Speaker with Acoustic Damped Port - Systems, methods, and devices for improving speaker performance with an acoustic damped port are disclosed. In accordance with various embodiments of the present invention, a damping material is placed around a vented frame of a speaker driver, and substantially covers or fills the vents of the frame. In some embodiments, the damping material results in improved impedance matching with acoustic delay, without required dimensional tuning (as with conventional ports). In some embodiments, it also reduces the air velocity gradients minimizing higher order frequency distortion components. In some embodiments, the damping material also acts as an absorber of energy by coupling to the sound wave. In some embodiments, low-frequency performance is improved in a small-scale design.03-24-2011
20120201398ETHERNET ISOLATOR FOR MICROPHONICS SECURITY AND METHOD THEREOF - A system and method for providing microphonic isolation on a transmission line. The transmission line has a first part and a second part. The first part of transmission line carries a data signal and a microphonic signal. The microphonic signal has frequencies that include those in a range of substantially 20 Hz to substantially 20 kHz. The system includes an isolation apparatus. The isolation apparatus has an input in electrical communication with a first part of the transmission line, an output in electrical communication with the second part of the transmission line, and a filter in electrical communication with the input and the output. The filter is arranged to substantially remove the microphonic signal received at the input from first part of transmission line and pass the data signal to the output.08-09-2012
20110249831WIRELESS MICROPHONE SYSTEMS HAVING IMPROVED IMMUNITY TO RF INTERFERENCE - A wireless microphone system is disclosed that uses a multiplicity of antennas to reduce or eliminate effects of radio frequency interference and intermodulation distortion. Signals from the multiplicity of antennas are selectively filtered, amplified and distributed as left and right diversity signals to microphone receivers for audio processing.10-13-2011
20100303256NOISE CANCELLATION SYSTEM WITH SIGNAL-TO-NOISE RATIO DEPENDENT GAIN - There is provided a noise cancellation system, comprising: a voice input, for receiving a wanted signal; a noise input for receiving a detected signal representative of ambient noise; a signal processor, for generating a noise cancellation signal for addition to the wanted signal, the signal processor having an adjustable gain; and control circuitry, for determining a relationship between levels of the wanted signal and the detected signal, and for controlling the adjustable gain on the basis of the determined relationship.12-02-2010
20110150238RECEIVING APPARATUS - A receiving apparatus includes: a local oscillator to output first- and second-local-oscillator signals whose phases are orthogonal to each other; a mixer to output first- and second-intermediate-frequency signals; a first filter to allow a component from a desired signal to pass therethrough, and eliminate a component from an image signal having a frequency symmetrical with that of the desired signal, in the first- and second-intermediate-frequency signals; a second filter to allow a component from the image signal to pass therethrough, and eliminate a component from the desired signal, in the first- and second-intermediate-frequency signals; a comparator to compare levels between output signals of the first and second filters; and a control unit to switch a frequency of the first- and second-local-oscillator signals to a difference frequency between a frequency of the desired signal and the intermediate frequency or a sum frequency thereof, according to a comparison result of the comparator.06-23-2011
20110150237Signal processing device and signal processing method - A signal processing device includes a non-inverting amplifier, an inverting amplifier, a converter, and a controller. The non-inverting amplifier amplifies a level of an analog sound signal input from outside with a first gain whose value is variable. The inverting amplifier amplifies a level of the analog sound signal amplified by the non-inverting amplifier with a second gain whose value is variable. The converter converts the analog sound signal amplified by the inverting amplifier to a digital sound signal. The controller detects a level of the digital sound signal converted by the converter and, in accordance with the detected level of the digital sound signal converted by the converter, controls the first gain and the second gain such that a level of the analog sound signal input to the converter is at a pre-specified level.06-23-2011
20080267425Method of Measuring Annoyance Caused by Noise in an Audio Signal - A method of computing an objective score (NOB) of annoyance caused by noise in an audio signal processed by a noise reduction function, said method including a preliminary step of obtaining a predefined test audio signal (x[m]) containing a wanted signal free of noise, a noisy signal (xb[m]) obtained by adding a predefined noise signal to said test signal (x[m]), and a processed signal (y[m]) obtained by applying the noise reduction function to said noisy signal (xb[m]), wherein said method further includes a step (a10-30-2008
20080267424Sound Source Supply Apparatus and Sound Source Supply Method - The present invention provides a sound source supply apparatus capable of playing music with less degradation of sound by processing an original sound source such that music is not determined to be a noise.10-30-2008
20100329480HIGHLY DIRECTIVE ENDFIRE LOUDSPEAKER ARRAY - A loudspeaker system with an endfire array of three or more loudspeakers (Z12-30-2010
20110085676APPARATUS AND METHOD FOR PROCESSING SIGNAL - An apparatus and method for processing a signal are provided. The signal processing apparatus includes: an audio processor which processes and outputs an audio signal; a video processor which processes and outputs an image; and a controller which controls the audio processor to perform a sound quality improvement process on the audio signal, and controls the video processor to display first data as a first image corresponding to a characteristic of the audio signal before performing the process and second data as a second image corresponding to the characteristic of the audio signal after performing the process04-14-2011
20110096942NOISE SUPPRESSION SYSTEM AND METHOD - Systems and methods are described for applying noise suppression to one or more audio signals to generate a noise-suppressed audio signal therefrom. In a single-channel implementation, an input signal is received that comprises a desired audio signal and an additive noise signal. Noise suppression is then applied to the input signal to generate a noise-suppressed signal in a manner that is controlled by at least a parameter that specifies a degree of balance between distortion of the desired audio signal and unnaturalness of a residual noise signal included in the noise-suppressed signal. In an alternative single-channel implementation, a plurality of sub-band signals obtained by applying a frequency conversion process to a time domain representation of an input signal is received. Noise suppression is then applied to each of the sub-band signals by passing each of the sub-band signals through a time direction filter. Multi-channel noise suppression variants are also described.04-28-2011
20100166215WIND NOISE REJECTION APPARATUS - An apparatus for reduction of wind noise comprised of an electro-acoustic transducer arrangement with at least two and preferably a minimum of three omni-directional transducer elements. The exposed structure is covered with at least one thin layer of wind-resistive material. The electrical outputs of the elements are added together to provide an output signal with increased signal to wind noise ratio. The signal may subject to additional signal processing such as filtering and/or level sensitive signal inhibition.07-01-2010
20110051957JITTER BUFFER ADAPTATION BASED ON AUDIO CONTENT - A system and method for discarding or inserting audio frames in a jitter buffer is described. The system and method provides improved audio quality as compared to conventional jitter buffer management systems. In one embodiment, buffer control logic determines whether to discard audio frames to be stored in a jitter buffer or to insert audio frames among audio frames to be output from a jitter buffer based not only on the number of audio frames currently stored in the jitter buffer but also based on the power of the current audio frame to be stored in or output from the jitter buffer. The system and method is generally applicable to any wireless or wired communication system in which audio signals are transmitted between entities operating in different clock domains.03-03-2011
20110051956APPARATUS AND METHOD FOR REDUCING NOISE USING COMPLEX SPECTRUM - An apparatus and method reduce noise in a complex spectrum domain to extract a target signal from input signals containing noise and target speech. Noise estimation may be performed through a filter with a filter learning coefficient that is updated according to a prior-signal-to-noise ratio (prior-SNR). Also, noise estimation accuracy may be improved by using confidential weighted scores. The target signal may be extracted by representing candidates of the target signal as at least two circles in the complex spectrum domain using the estimated noise and then geometrically calculating the intersections of the circles.03-03-2011
20110051955MICROPHONE SIGNAL COMPENSATION APPARATUS AND METHOD THEREOF - A microphone signal compensation apparatus includes a plurality of audio input units to respectively receive a target signal, each audio input unit of the plurality of audio input units including a microphone; a constant filter unit to selectively apply a constant filtering calibration scheme to signals output by the plurality of audio input units to compensate for a difference in at least one characteristic among the audio input units, the constant filtering calibration scheme being estimated from an average value of a ratio of a desired signal to a reference signal among the signals output by the plurality of audio input units; and a noise remover to remove noise from the signals processed by the constant filter unit, and to separate the target signal from the signals from which the noise has been removed.03-03-2011
20120207325Multi-Channel Wind Noise Suppression System and Method - A system and method for suppressing noise in one or more of at least first and second channels include obtaining a magnitude difference of signals in the first and second channels, obtaining a magnitude sum of signals in the first and second channels, obtaining a ratio of the magnitude difference to the magnitude sum, generating an attenuation value based on the ratio, selecting an attenuator based on the magnitude difference, and attenuating a signal in a channel by the attenuation value using the selected attenuator.08-16-2012
20110188670SYSTEM AND METHOD FOR REDUCING RUB AND BUZZ DISTORTION - An audio driver with reduced rub and buzz distortion that includes a digital processing module. A digital to audio converter (DAC) operable to receive a digital audio signal supplied by the digital processing module. One or more analog driver stages operable to receive an analog audio signal supplied by the DAC. A peak amplitude compressor.08-04-2011
20100166214ELECTRICAL APPARATUS, AUDIO-RECEIVING CIRCUIT AND METHOD FOR FILTERING NOISE - An electronic apparatus at least including an audio-receiving circuit is provided. The audio-receiving circuit includes an audio receiver and a processor. The audio receiver receives a sound wave from a sound source, and generates a first audio signal containing a plurality of noises to the processor. The processor performs a signal processing of time reversal to the first audio signal to restore a sound sent at an original sound source, so as to filter noises in the first audio signal and output a second audio signal.07-01-2010
20100020985METHOD AND APPARATUS FOR REDUCING AUDIO ARTIFACTS - An apparatus and method for processing signals are disclosed. The apparatus may include a receiver configured to receive an audio signal having a plurality of audio artifacts, and an audio circuit configured to reduce the audio artifacts during at least a portion of a time period as a function of an energy level of the audio signal during that time period.01-28-2010
20100020986SINGLE-MICROPHONE WIND NOISE SUPPRESSION - A technique for suppressing non-stationary noise, such as wind noise, in an audio signal is described. In accordance with the technique, a series of frames of the audio signal is analyzed to detect whether the audio signal comprises non-stationary noise. If it is detected that the audio signal comprises non-stationary noise, a number of steps are performed. In accordance with these steps, a determination is made as to whether a frame of the audio signal comprises non-stationary noise or speech and non-stationary noise. If it is determined that the frame comprises non-stationary noise, a first filter is applied to the frame and if it is determined that the frame comprises speech and non-stationary noise, a second filter is applied to the frame.01-28-2010
20120148069MICROPHONE ARRAY STRUCTURE ABLE TO REDUCE NOISE AND IMPROVE SPEECH QUALITY AND METHOD THEREOF - The present invention discloses a microphone array structure able to reduce noise and improve speech quality and a method thereof. The method of the present invention comprises steps: using at least two microphone to receive at least two microphone signals each containing a noise signal and a speech signal; using FFT modules to transform the microphone signals into frequency-domain signals; calculating an included angle between a speech signal and a noise signal of the microphone signal, and selecting a phase difference estimation algorithm, a noise reduction algorithm or both to reduce noise according to the included angle; if the phase difference estimation algorithm is used, calculating phase difference of the microphone signals to obtain a time-space domain mask signal; and multiplying the mask signal and the average of the microphone signals to obtain the speech signals of the microphone signals. Thereby is eliminated noise and improve speech quality.06-14-2012
20100027810METHOD AND DEVICE FOR TYPING NOISE REMOVAL - A method for reducing keyboard noise in conferencing equipment which includes a microphone and a keyboard, the method including: providing, at a noise reduction apparatus, an audio signal originating from the microphone; detecting, at the noise reduction apparatus, an operation of the keyboard; providing, at the noise reduction apparatus, a pre-stored estimate of a keyboard audio noise resulting from the operation of the keyboard upon detection of the operation of the keyboard; and calculating, at the noise reduction apparatus, a noise reduced output signal based on the estimate of the keyboard audio noise and the audio signal.02-04-2010
20120308041CIRCUIT ASSEMBLY FOR PROCESSING AN ELECTRICAL SIGNAL OF A MICROPHONE - A circuit assembly for processing an electrical signal of a microphone is provided. The microphone has an inherent impedance. The circuit assembly comprises an impedance circuit, a signal processing unit, a first electrical signal path, and a second electrical signal path. The first electrical signal path is coupleable to a first electrical output of the microphone and is furthermore coupled to a first input of the signal processing unit. The second electrical signal path is coupleable to a second electrical output of the microphone and is furthermore coupled to a second input of the signal processing unit via the impedance circuit. An impedance value of the impedance circuit is selected based on an impedance value of the inherent impedance of the microphone.12-06-2012
20110305351AUDIO SIGNAL PROCESSING APPARATUS AND METHOD OF CONTROLLING THE SAME - When a first noise and second noise to be generated after the first noise are generated within a predetermined period, a noise reduction unit is controlled so as to execute a first noise reduction process for an audio signal in a period including the first noise and not to execute the first noise reduction process for an audio signal in a period including the second noise.12-15-2011
20110142255SOUND PROCESSING APPARATUS AND METHOD - A sound processing apparatus according to the present invention sets a volume value to a default value, outputs a pure tone signal of a predetermined frequency as a test signal from a loudspeaker, and acquires the output test signal using a microphone. When a signal level of a harmonic tone component of the acquired signal is equal to or greater than a threshold, the apparatus reduces the volume value so that the signal level equal to or greater than the threshold falls below the threshold and stores the reduced volume value. When outputting an acoustic signal, the apparatus adjusts a signal level of the acoustic signal at a stored frequency so that a product of a signal level at the stored frequency and a current volume value does not exceed a product of a signal level of the test signal and the stored volume value.06-16-2011
20120148068COEXISTENCE OF WHITE SPACE DEVICES AND WIRELESS NARROWBAND DEVICES - Architecture that enables wireless narrowband devices (e.g., wireless microphones) and white space devices to efficiently coexist on the same telecommunications channels, while not interfering with the usability of the wireless narrowband device. The architecture provides interference detection, strobe generation and detection and, power ramping and suppression (interference-free coexistence with spectrum efficiency). The architecture provides the ability of the white space device to learn about the presence of the microphone. This can be accomplished i using a geolocation database, reactively via a strober device, and/or proactively via the strober device. The strober device can be positioned close to the microphone receiver and signals the presence of a microphone to white space devices on demand. The strober device takes into consideration the microphone's characteristics as well as the relative signal strength from the microphone transmitter versus the white space device, in order to enable maximum use of the available white space spectrum.06-14-2012
20110064240Dynamic Noise Reduction in Auditory Prosthesis Systems - An exemplary method of dynamically adjusting an amount of noise reduction applied in an auditory prosthesis system includes dividing an audio signal presented to a patient into a plurality of analysis channels each containing a signal representative of a distinct frequency portion of the audio signal, determining an overall noise level of the signals within the analysis channels, and dynamically adjusting an amount of noise reduction applied to the signals within the analysis channels in accordance with the determined overall noise level. The dynamic adjustment of noise reduction is configured to minimize the amount of noise reduction applied to the signals within the analysis channels if the overall noise level is less than a predetermined minimum threshold. Corresponding methods and systems are also disclosed.03-17-2011
20110091050SOUND PROCESSING APPARATUS, SOUND PROCESSING METHOD, AND SOUND PROCESSING PROGRAM - A sound processing apparatus includes a power spectrum operation unit obtaining a power spectrum of an audio signal, an envelope component removal unit removing an envelope component of the power spectrum and generating a signal characteristic that represents a peakness of the power spectrum, a filter characteristic calculation unit calculating a filter characteristic suppressing the signal characteristic by using the signal characteristic, and a suppress filter filtering the audio signal by using the filter characteristic.04-21-2011
20120045074SYSTEM, METHOD AND APPARATUS WITH ENVIRONMENTAL NOISE CANCELLATION - Disclosed herein are system, method and apparatus with environmental noise cancellation. The instant disclosure is particularly adapted to a receiver module having at least two inputs. The two inputs respectively receive a main audio portion and the audio with majority of environmental noise. The system firstly calibrates the audio signals to reduce the error caused by the difference between the two inputs. An adaptive beamforming technology and a speech extractor are respectively used to extract the environmental noise portion with less main audio and the main audio portion with less noise. After a process of time-to-frequency domain transformation, a non-linear noise suppression technology is introduced into estimating the environmental noise and acquiring a gain. After noise suppression processed with the gain, a sequence of audio signals is output after a frequency-to-time domain transformation.02-23-2012
20110075860SOUND SOURCE SEPARATION AND DISPLAY METHOD, AND SYSTEM THEREOF - The present invention relates to a sound source separation and display method and a system thereof, and provides in particular a sound source separation and display method and a system thereof that are intended to eliminate a specific sound source. In order to separate a plurality of sound sources by using a single set of microphone array, the result of processing of sound source identification is utilized. More specifically, a signal in a direction is extracted from the result of the processing of the sound source identification, and a field limited to/eliminated of the effect of the signal is calculated and displayed. Such an operation can be repeated. A virtual reference signal can be created in a time domain.03-31-2011
20090310798Method for reducing a disturbance in an input signal caused by an output signal in a multi-port connector, multi-port connector, and mobile device - A method for reducing a disturbance in an input signal caused by an output signal in a multi-port connector, a multi-port connector circuit for reducing a disturbance in an input signal caused by an output signal, and a mobile device are described.12-17-2009
20120008796DISTORTION COMPENSATION - A distortion compensation system minimizes distortion in an audio system by monitoring a supply voltage and adjusting a clipping threshold and/or compression knee. An adjustable gain circuit controls the gain of the audio signal according whether the audio signal exceeds a variable threshold. The variable threshold is adjusted within a threshold range based on the supply voltage. Distortion due to clipping of the audio signal is minimized while available power at any given time is maximized.01-12-2012
20120250882INTEGRATED ECHO CANCELLATION AND NOISE SUPPRESSION - A method for echo cancellation and noise suppression is disclosed. Linear echo cancellation (LEC) is performed for a primary microphone channel on an entire frequency band or in a range of frequencies where echo is audible. LEC is performed on one or more secondary microphone channels only on a lower frequency range over which spatial processing is effective. The microphone channels are spatially processed over the lower frequency range after LEC. Non-linear noise suppression post-processing is performed on the entire frequency band. Echo post-processing is performed on the entire frequency band.10-04-2012
20120207326SIGNAL PROCESSING METHOD, INFORMATION PROCESSING APPARATUS, AND STORAGE MEDIUM FOR STORING A SIGNAL PROCESSING PROGRAM - Provided is a noise suppressing technology capable of suppressing various noises including unknown noises without storing information relating to a large number of noises in advance. Noises in a degraded signal are suppressed and noise information is generated on the basis of a noise suppression result. The noises in the degraded signal are suppressed using the generated noise information.08-16-2012
20120155673Compensation Filtering Device and Method Thereof - According to one embodiment, a compensation filtering device includes an impulse response calculator, a group delay compensator, and an extractor. The impulse response calculator calculates an impulse response of a reproduction system comprising a sound field. The group delay compensator compensates for group delay characteristics in a low frequency range lower than a predetermined frequency for a finite impulse response (FIR) filter having reverse characteristics of the impulse response based on group delay characteristics in a middle to high frequency range higher than the predetermined frequency. The extractor extracts a predetermined number of taps from the FIR filter that has been compensated for by the group delay compensator.06-21-2012
20120106757MOBILE WIRELESS COMMUNICATIONS DEVICE HAVING IMPROVED RF IMMUNITY OF AUDIO TRANSDUCERS TO ELECTROMAGNETIC INTERFERENCE (EMI) - A mobile wireless communications device includes a housing and circuit board carried by the housing and having radio frequency (RF) circuitry and a processor operative with each other. Audio circuitry is carried by the circuit board and an audio transducer assembly, such as a speaker, has electrical contacts that electrically engage the audio circuitry for carrying audio signals between the audio circuitry and audio transducer assembly. A filter is mounted at the audio transducer assembly and reduces radio frequency (RF) electromagnetic interference to the audio transducer assembly during device operation.05-03-2012
20100172514SOUND PROCESSING SYSTEM - A sound enhancement system is configured such that sound emitting and collecting apparatuses 07-08-2010
20100183167Multi-membrane microphone for high-amplitude audio capture - Disclosed herein are apparatus, method, and computer program product whereby a device receives an acoustic signal. In response to the received acoustic signal, the device outputs electrical signals from a first input audio transducer and a second input audio transducer. The second input audio transducer is less sensitive than the first input audio transducer.07-22-2010
20110103614Hybrid audio delivery system and method therefor - Methods and systems to produce audio output signals from audio input signals. In one embodiment, a first portion of the audio input signals can be pre-processed, with the output used to modulate ultrasonic carrier signals, thereby producing modulated ultrasonic signals. The modulated ultrasonic signals can be transformed into a first portion of the audio output signals, which is directional. Based on a second portion of the audio input signals, a standard audio speaker can output a second portion of the audio output signals. Another embodiment further produces distortion compensated signals based on the pre-processed signals. The distortion compensated signals can be subtracted from the second portion of the audio input signals to generate inputs for the standard audio speaker to output the second portion of the audio output signals. In yet another embodiment, noise can be added during pre-processing of the first portion of the audio input signals.05-05-2011
20100290642SPEAKER CHARACTERISTIC CORRECTION DEVICE, SPEAKER CHARACTERISTIC CORRECTION METHOD AND SPEAKER CHARACTERISTIC CORRECTION PROGRAM - A speaker characteristic correction device obtains a first speaker information of a first speaker, obtains a first sound field characteristic at an evaluation point that is obtained by using the first speaker in advance, and obtains a second speaker parameter indicating a mechanical characteristic and an electric characteristic of a second speaker. Then, the speaker characteristic correction device calculates a correction characteristic based on the first speaker information and the second speaker parameter, and calculates the second sound field characteristic by applying the correction characteristic to the first sound field characteristic. Thereby, when the speaker type is changed, it is possible to easily calculate the sound field characteristic without performing the re-measurement by installing the speaker and without performing the re-analysis by setting the analysis condition.11-18-2010
20120121106DISTORTION SUPPRESSION IN HIGH-LEVEL CAPABLE AUDIO AMPLIFICATION CIRCUIT - The present invention relates to an audio amplification circuit comprising a first preamplifier for receipt of an audio input signal and a second preamplifier comprising a first differential input for receipt of an attenuated audio input signal. The attenuated audio input signal is generated by an attenuator coupled to the audio input signal. A non-linear element is coupled to a first input of the first preamplifier thereby distorting the audio input signal at the first input at large signal levels. A distortion compensation network is adapted to supply a distortion compensation signal from the first input of the first preamplifier to a second differential input of the second preamplifier such that distortion in the output signal of the second preamplifier is cancelled or attenuated. The invention further relates to a corresponding method of compensating an audio amplification circuit for distortion induced by a non-linear element.05-17-2012
20100246850METHOD AND ACOUSTIC SIGNAL PROCESSING SYSTEM FOR BINAURAL NOISE REDUCTION - A method and an acoustic signal processing system for noise reduction of a binaural microphone signal are proposed. A source signal and two interfering signals input to a left and a right microphone of a binaural microphone system respectively. A left and a right microphone signal is filtered by a Wiener filter to obtain binaural output signals of the source signal. The Wiener filter is calculated as09-30-2010
20100246849SIGNAL PROCESSING APPARATUS - A signal processing apparatus is configured to change volume level or frequency characteristics of an input signal with a limited bandwidth in a first frequency range. The apparatus includes: an information extracting unit configured to extract second frequency characteristic information from a collection signal with a limited bandwidth in a second frequency range different from the first frequency range; a frequency characteristic information extending unit configured to estimate first frequency characteristic information from the second frequency characteristic information extracted by the information extracting unit, the first frequency characteristic information including the first frequency range; and a signal correcting unit configured to change volume level or frequency characteristics of the input signal according to the first frequency characteristic information obtained by the frequency characteristic information extending unit.09-30-2010
20100246851Method for Determining a Noise Reference Signal for Noise Compensation and/or Noise Reduction - The invention provides a method for determining a noise reference signal for noise compensation and/or noise reduction. A first audio signal on a first signal path and a second audio signal on a second signal path are received. The first audio signal is filtered using a first adaptive filter to obtain a first filtered audio signal. The second audio signal is filtered using a second adaptive filter to obtain a second filtered audio signal. The first and the second filtered audio signal are combined to obtain the noise reference signal. The first and the second adaptive filter are adapted such as to minimize a wanted signal component in the noise reference signal.09-30-2010
20120163627Wireless Audio Equipment Using a Quadrature Modulation System - A communications system, e.g., a wireless microphone, incorporates a quadrature modulator system to reduce power consumption with respect to traditional approaches and is general in nature to support any two-dimensional digital technique. The quadrature modulator system comprises different subsystems, including a digital-analog transformation circuit, a baseband filter, and a quadrature modulator. The digital-analog transformation circuit converts discrete time samples to a continuous time signal, and further includes an oversampling noise-shaping modulator such as a sigma-delta modulator. The baseband filter then removes out-of-band energy including sampling images and quantization noise. Some of the circuit components may comprise discrete devices that may result in a reduction of power consumption for the quadrature modulator system. Alternatively, some or all of the circuit components may be incorporated in a single electronic device. For example, an in-phase/quadrature-phase (I/Q) converter and oversampling noise-shaping modulator may be implemented within one field-programmable gate array.06-28-2012
20110182439LOOP GAIN ESTIMATING APPARATUS AND HOWLING PREVENTING APPARATUS - A pseudo noise superimposing unit superimposes a pseudo noise (M-sequence) to an audio signal picked up by a microphone and outputs the superimposed signal to an amplifying system. An calculating unit calculates a correlation value between the audio signal picked up by the microphone and the pseudo noise. The calculating unit estimates a gain of a closed loop based on the correlation value. A gain control unit suppresses a gain of the audio signal based on the estimated gain of the closed loop.07-28-2011
20120134508Audio Processing Apparatus - An audio processing apparatus generates a suppression coefficient sequence that is composed of coefficient values corresponding to frequency components of an audio signal, the frequency components being multiplied by the corresponding coefficient values to suppress noise components of the audio signal. In the audio processing apparatus, a characteristic value calculation unit calculates a noise characteristic value depending on a shape of a magnitude distribution of the audio signal. An intensity setting unit variably sets a suppression intensity of the noise components based on the noise characteristic value. A coefficient sequence generation unit generates the suppression coefficient sequence based on the audio signal and the suppression intensity.05-31-2012
20120076321Single Microphone for Noise Rejection and Noise Measurement - A microphone includes a sensing element having two opposing sides; and a housing including a first acoustic port having an external-facing portion defined in part by a first aperture located on a first housing side and an internal-facing portion defined in part by a first cavity within the housing, the first cavity being coupled to a first side of the element; and a second acoustic port having an external-facing portion defined in part by a second aperture located on the first housing side and an internal-facing portion defined in part by a second cavity within the housing, the second cavity being coupled to a second side of the element. The ports are spaced apart at a distance such that a level of an electrical response by the element to an ambient acoustic noise at 50 dB A-weighted sound pressure level exceeds an internal electrical noise level of the element.03-29-2012
20120076320Fine/Coarse Gain Adjustment - Methods and apparatuses for deriving a signal-to-noise ratio based at least in part on a measured level of a signal carrying far-end speech, and a measured level of a signal carrying ambient acoustic noise, determining a target gain adjustment based at least in part on the derived signal-to-noise ratio, including determining a coarse gain adjustment and a fine gain adjustment, the target gain adjustment corresponding to a combination of the coarse gain adjustment and the fine gain adjustment, applying the coarse gain adjustment to the signal carrying far-end speech using first gain adjustment circuitry to produce a first gain-adjusted signal, applying the fine gain adjustment to the signal carrying far-end speech using second gain adjustment circuitry to produce a second gain-adjusted signal, and providing a result of combining the first gain-adjusted signal and the second gain-adjusted signal to audio output from a wireless communications device.03-29-2012
20120177221AUDIO ENHANCEMENT SYSTEM - A system for enhancing the sound signal produced by an audio system in a listening environment by compensating for ambient noise in the listening environment is provided. The system receives an electrical sound signal and generates a sound output therefrom. A total sound signal is sensed representative of the total sound level in the environment, where the total sound level includes both the sound output from the audio system and the ambient noise within the environment. The system extracts an ambient noise signal representative of the ambient noise in the environment from the total sound signal in response to the total sound signal and to a reference signal derived from the electrical sound signal. The system extracts the ambient noise signal using an adaptive filter with an adaptive step size. The system generates a control signal in response to the ambient noise signal and adjusts the sound output of the audio system to compensate for the ambient noise level in response to the control signal. The system calculates a step size for controlling the adaptive step size of the adaptive filter.07-12-2012
20120177220AUDIO SIGNAL CORRECTION APPARATUS, AUDIO SIGNAL CORRECTION METHOD, AND AUDIO SIGNAL CORRECTION PROGRAM - A first differential value is acquired between first current data and first previous data in an i number (i being a natural number) of sampling periods before the current data. A second differential value is acquired between second current data and second previous data in a j number (j being a natural number) of sampling periods before the current data. Both first data and both second data are of a first and a second digital audio signal, respectively, having a sound level of a digital stereo audio signal in the left and right channels, respectively. A first and a second correction coefficient are acquired by adding the first and second differential values at a first and a second ratio, respectively. The first signal is corrected by multiplying the first signal by the first correction coefficient. The second signal is corrected by multiplying the second signal by the second correction coefficient.07-12-2012
20120177222DYNAMIC AUDIO PARAMETER ADJUSTMENT USING TOUCH SENSING - An audio communications device has a handset in which a touch sensing ear piece region is coupled to an acoustic leakage analyzer. The acoustic leakage analyzer is to analyze signals from the touch sensing ear piece region and on that basis adjust an audio processing parameter. The latter configures an audio processor which generates an audio receiver input signal for the device. Other embodiments are also described and claimed.07-12-2012
20120189138SIGNAL PROCESSING METHOD, SIGNAL PROCESSING APPARATUS, AND SIGNAL PROCESSING PROGRAM - A desired signal is extracted with a higher accuracy from a mixed signal wherein a plurality of signals are mixed. At the time of extracting a first signal from a first mixed signal and a second mixed signal, said first mixed signal and second mixed signal having the first signal and second signal mixed therein, an estimate value of the first signal in the past is obtained as a first estimate value, and an estimate value of the second signal in the past is obtained as a second estimate value. Then, a first isolation signal is generated by subtracting the second estimate value from the first mixed signal, and a second isolation signal is generated by subtracting the first estimate value from the second mixed signal. Then, the signal generated using the first isolation signal and the second isolation signal is outputted as the first signal.07-26-2012
20110116651DISTRIBUTED SOUND ENHANCEMENT - Sound quality is enhanced in a sound system including handsets and headsets. Handset sound enhancing algorithms are implemented in a handset. The handset automatically determines which, if any, of a plurality of headset sound enhancing algorithms are active in a headset in communication with the handset. The handset determines how to use the handset sound enhancing algorithms in a sound processing channel based on which of the headset sound enhancing algorithms are active in the headset.05-19-2011
20090016544LOW-POWER DIGITAL-TO-ANALOG CONVERTER - A digital-to-analog converter (DAC) with a digital segment having a digital data input and an analog segment coupled to the digital segment and having an analog output to output an analog signal corresponding to the digital data. The analog segment includes one or more gain stages and a feedback structure to couple the analog output to the one or more gain stages to attenuate signal distortion at the analog output. A combined gain of the one or more gain stages determines a signal distortion attenuation characteristic of the analog segment.01-15-2009
20110123042ACTIVE VIBRATION/NOISE CONTROL DEVICE - An active vibration/noise control device which is provided with a plurality of cancel signal generation parts for generating output signals for respectively cancelling noises generated at a plurality of vibration/noise generation sources. The effect of the suspension of either of first and second cancel signal generation parts on the other is reduced. According to the operating state of the first cancel signal generation part, the simulated transmission properties of the second cancel signal generation part are adjusted. Consequently, without regard to the operating state of the first cancel signal generation part, the noise control performance of the second cancel signal generation part can be maintained.05-26-2011
20120321101WIRELESS MIC SYSTEM FOR AUTOMATICALLY PARING - Disclosed is a wireless MIC system for automatically paring, which comprises a wireless MIC which includes a paring button at its one side and facilitates a connection mode as it is automatically paired with an amplifier by transmitting a paring request signal when the paring button is on, and initializes a connection related information stored in a storing part when the connection mode is cancelled and converts an acoustic signal into a digital audio signal and transmits to the paired amplifier; and an amplifier which facilitates a connection mode as the wireless MIC and the amplifier are paired by setting a transmission and receiving channel of the amplifier and the wireless MIC, and amplifies a digital audio signal from the wireless MIC and outputs in an acoustic form.12-20-2012
20110261974OUTPUT CIRCUIT FOR AUDIO CODEC CHIP - An output circuit for audio codec chip includes an audio amplifier chip and a noise eliminating circuit electrically connected to the audio codec chip and the audio amplifier chip. The audio amplifier chip receives audio signals form the audio codec chip and outputs amplified audio signals. The noise eliminating circuit includes a voltage detection circuit and a switch circuit; wherein when the voltage detection circuit detects a high voltage level power on/off signal in the audio signals received by the audio codec chip, the voltage detection circuit turns on the switch circuit. The audio amplifier chip is grounded via the switch circuit for eliminating interference of the noise signals.10-27-2011
20120087514METHOD AND APPARATUS FOR REMOTELY SWITCHING NOISE REDUCTION MODES IN A RADIO SYSTEM - A radio configured to dynamically control cancellation of undesired signals in an audio stream. The radio includes a noise cancellation processor configured to receive an audio stream from a user and to alter information in the audio stream by filtering out undesired signals in the audio stream. The radio also includes a receiving component configured to receive a data packet from a remote device, to retrieve configuration information from the data packet, and to dynamically apply the configuration information, while the radio is being used by a user, to settings associated with the noise cancellation processor. A dynamically enabled noise cancellation processor suppresses undesired signals associated with a subsequent incoming audio stream provided by the user and transmits at least one of an altered audio stream or an unaltered audio stream to the remote device.04-12-2012
20120288115Method, Apparatus, and Computer Program For Suppressing Noise - A method, an apparatus, and a computer program, which can suppress a low frequency range component with a small amount of calculation, and can achieve a noise suppression of high quality, are provided. The noise superposed in a desired signal of an input signal is suppressed by converting the input signal to a frequency domain signal; correcting an amplitude of the frequency domain signal to obtain an amplitude corrected signal; obtaining an estimated noise by using the amplitude corrected signal; determining a suppression coefficient by using the estimated noise and the amplitude corrected signal; and weighting the amplitude corrected signal with the suppression coefficient.11-15-2012
20130010981MICROPHONE - A microphone capable of canceling vibration noise caused by mechanical vibration is provided with, in capsules, a pair of diaphragms and a pair of back plates opposite to the respective diaphragms. A printed circuit board is disposed at the middle of capsules. A pair of diaphragms is disposed close and opposite to the surfaces of the printed circuit board with the printed circuit board disposed therebetween. The difference in distance from a vibration source to the two diaphragms is made small. The microphone has a high canceling effect for canceling vibration noise caused by mechanical vibration.01-10-2013
20130016853AUDIO APPARATUS CAPABLE OF NOISE SUPPRESSION AND NOISE-SUPPRESSED MOBILE PHONE - The present invention provides an audio apparatus capable of noise suppression, including a first signal processing circuit which is set with two input ends and one output end, where one input end is configured to receive noise and the other input end is configured to receive a digital music signal; and a second signal processing circuit which is connected to the output end of the first signal processing circuit. The first signal processing circuit is configured to generate a noise inversion signal, and mix and superpose the noise inversion signal with the digital music signal to obtain a mixed signal. The second signal processing circuit is configured to perform digital/analog conversion and amplification on the mixed signal, and output the signal to an earphone. The present invention further provides a noise-suppressed mobile phone where the earphone does not need to carry a power supply and a signal processing module.01-17-2013
20110158428SOUND DISTORTION SUPPRESSION CONTROL METHOD AND ACOUSTIC CONTROL APPARATUS USING THE METHOD - A sound distortion suppression control method not causing sound distortion even if the volume of an amplifier is increased to nearly its maximum value when the user adjusts bass and treble to obtain desired tone. Sound to be output is specified by a volume setting value, a bass setting value and a treble setting value, and these values are temporarily stored in a memory section. Furthermore, a maximum allowable bass value and a maximum allowable treble value are respectively stored in the memory section in advance. In the case that the bass setting value and the treble setting value become larger than the maximum allowable bass value and the maximum allowable treble value, respectively, the bass setting value and the treble setting value are changed to a value not more than the maximum allowable bass value and a value not more than the maximum allowable treble value, respectively.06-30-2011
20110158427AUDIO SIGNAL COMPENSATION DEVICE AND AUDIO SIGNAL COMPENSATION METHOD - An audio signal compensation device includes: a signal processor configured to perform filtering on an input audio signal; a filter coefficients storage module configured to store a plurality of filter coefficients; a user interface configured to provide options for a determination of filter coefficients to a user and to obtain a selection result from the user; and a filter coefficients determining module configured to determine a set of filter coefficients among the plurality of filter coefficients based on the selection result. The options for the determination of filter coefficients are produced by selecting a first filter coefficient and a second filter coefficient from the plurality of filter coefficients, the first filter coefficient corresponding to a first characteristic quantity of external auditory canal characteristics, the second filter coefficient corresponding to a second characteristic quantity of the external auditory canal characteristics which is predicted based on the first characteristic quantity.06-30-2011
20080232610Audio Amplifier with Reduced Noises - An audio amplifier comprises: a first stage and a second stage amplifiers each respectively providing an output to a speaker; a first resistor electrically connected in parallel with the first stage amplifier; a second resistor electrically connected in series with an input of the first stage amplifier; a third resistor electrically connected in parallel with the second stage amplifier; a fourth resistor electrically connected in series with an input of the second stage amplifier, and also electrically connected in series with an output of the first stage amplifier; and a variable resistor electrically connected in parallel with the first resistor, the variable resistor and the first resistor forming a variable resistance parallel circuit.09-25-2008
20080226097Filter Circuit and Reproduction Device Using the Same - A low-pitched sound which cannot be reproduced by a speaker is cut off. An operational amplifier A09-18-2008
20110274291ROBUST ADAPTIVE BEAMFORMING WITH ENHANCED NOISE SUPPRESSION - A novel adaptive beamforming technique with enhanced noise suppression capability. The technique incorporates the sound-source presence probability into an adaptive blocking matrix. In one embodiment the sound-source presence probability is estimated based on the instantaneous direction of arrival of the input signals and voice activity detection. The technique guarantees robustness to steering vector errors without imposing ad hoc constraints on the adaptive filter coefficients. It can provide good suppression performance for both directional interference signals as well as isotropic ambient noise.11-10-2011
20110274290FAST START-UP CIRCUIT FOR AUDIO DRIVER - A driver device for suppression audible transients of an audio amplifier includes an amplifier for receiving an audio signal and a bias circuit configured to quickly generate a voltage level for biasing the amplifier, wherein the voltage level is maintained even if the driver device is powered off. The bias circuit may include a CMOS inverter having a negative feedback that has a standby current of less than 100 nA. The bias circuit further includes a buffer for rapidly charging an external capacitor. The buffer may change to a high impedance state rapidly when the power supply is disconnected.11-10-2011
20120250884MULTI-MEMBRANE MICROPHONE FOR HIGH-AMPLITUDE AUDIO CAPTURE - Disclosed herein are apparatus, method, and computer program product whereby a device receives an acoustic signal. In response to the received acoustic signal, the device outputs electrical signals from a first input audio transducer and a second input audio transducer. The second input audio transducer is less sensitive than the first input audio transducer.10-04-2012
20120250883NOISE REMOVAL DEVICE AND NOISE REMOVAL PROGRAM - A noise removal unit 10-04-2012
20120275623MOBILE WIRELESS COMMUNICATIONS DEVICE HAVING IMPROVED RF IMMUNITY OF AUDIO TRANSDUCERS TO ELECTROMAGNETIC INTERFERENCE (EMI) - A mobile wireless communications device includes a housing and circuit board carried by the housing and having radio frequency (RF) circuitry and a processor operative with each other. Audio circuitry is carried by the circuit board and an audio transducer assembly, such as a speaker, has electrical contacts that electrically engage the audio circuitry for carrying audio signals between the audio circuitry and audio transducer assembly. A filter is mounted at the audio transducer assembly and reduces radio frequency (RF) electromagnetic interference to the audio transducer assembly during device operation.11-01-2012

Patent applications in class NOISE OR DISTORTION SUPPRESSION

Patent applications in all subclasses NOISE OR DISTORTION SUPPRESSION