Class / Patent application number | Description | Number of patent applications / Date published |
455570000 | Noise suppression or echo cancellation | 60 |
20080268914 | Wireless earphone with unidirectional and omnidirectional microphones - A wireless earphone (e.g., a Bluetooth earphone) is disclosed that includes a housing having a first hole and a second hole, a unidirectional microphone disposed rearward of the first hole; an omnidirectional microphone disposed rearward of the unidirectional microphone and under the second hole, and a mounting assembly in the housing for fastening the omnidirectional and unidirectional microphones. The earphone can substantially block out external noise and greatly reduce echo. | 10-30-2008 |
20080318641 | Electronic Device for Reducing Audio Noise Caused from Unbalanced Ground And Mobile Communication Device Thereof - An electronic device includes a first circuit board having a first audio source and a first reference grounding end, a second circuit board having a second audio source and a second reference grounding end, a flexible board cable, a grounding wiring, a selection unit, and a receiver. The flexible board cable couples the first audio source to the second circuit board. The grounding wiring couples the first grounding end to the second circuit board. The selection unit is used for selecting one from the first and second audio sources to output and selecting one from the first and second reference grounding ends to output. An input end of the receiver is controlled by the selection unit to be connected to the first or second audio sources, and a grounding end of the receiver is controlled by the selection unit to be connected to the first or second reference grounding ends. | 12-25-2008 |
20090017877 | WI-FI PHONE WITH HANDS-FREE FEATURE - The present invention discloses a Wi-Fi phone with a hands free feature, wherein the Wi-Fi phone connects with a wireless network to provide VoIP communication. The Wi-Fi phone integrates an earphone into a hands-free Wi-Fi phone, wherein the earphone can be extended or retracted. Furthermore, the Wi-Fi phone of the present also integrates a Bluetooth headset into a hands-free Wi-Fi phone. | 01-15-2009 |
20090017878 | ACOUSTIC ECHO REDUCTION IN MOBILE TERMINALS - An electronic device includes first and second speakers, a microphone, and circuitry configured to generate first and second audio signals in response to a source audio signal, to play the first audio signal over the first speaker, and to play the second audio signal over the second speaker. The first and second audio signals are configured, and the first and second speakers are positioned, so that the first audio signal output by the first speaker and the second audio signal output by the second speaker combine destructively at the microphone. | 01-15-2009 |
20090036170 | VOICE ACTIVITY DETECTOR AND METHOD - Acoustic echo control for hands-free phone has acoustic echo cancellation and echo suppression with a voice activity detection for the echo suppression based on near-end input power together with an estimate for acoustic echo cancellation gain. | 02-05-2009 |
20090082071 | Alert Processing Devices and Systems for Noise-Reducing Headsets and Methods for Providing Alerts to Users of Noise-Reducing Headsets - A system includes an active noise-reducing headset and an alert processor. The active noise reducing headset includes a communication module that establishes a wireless communication link, a microphone that generates a microphone signal in response to ambient noise, a speaker, a noise reduction circuit that generates a noise reduction signal in response to the microphone signal, and a control circuit that receives an incoming alert signal from the communication module and plays the alert signal over the speaker. The alert processor includes a second communication module that establishes the wireless link with the active noise-reducing headset, and a controller that receive an incoming alert signal, generates an alert notification in response to the alert signal, and transmits the alert notification to the active noise-reducing headset. | 03-26-2009 |
20090088223 | ECHO CANCELLER WITH CORRELATION USING PRE-WHITENED DATA VALUES RECEIVED BY DOWNLINK CODEC - Duplex audio communications over a network use compressed audio data, with linear prediction coefficients (LPCs) and variances by which sample values differ from predictions. A adaptive echo canceller for a transceiver develops finite impulse response filter (FIR) coefficients characterizing an echo path between its local audio output and audio input. The received/decompressed audio data is applied to the FIR coefficients, and the predicted echo is subtracted from the uplink signal. Echo is detected as cross-correlation of the receive signal versus the uplink/send signal over time. In one embodiment, the cross-correlation is determined using a pre-whitened receive signal, obtained by adopting the variance values received over the network by the downlink Codec. Apart from the uplink Codec, no speech analysis filter or process is needed. The technique is apt for GSM, AMR and similar compressed audio communications. | 04-02-2009 |
20090088224 | ADAPTIVE VOLUME CONTROL - A system comprising processing logic and sound-capturing logic coupled to the processing logic. The sound-capturing logic provides a captured signal to the processing logic. The captured signal is associated with a property. Transceiver logic is coupled to the processing logic. The transceiver logic provides a received signal to the processing logic. The received signal is associated with a volume. Using a compression technique, the processing logic adjusts the volume in accordance with the property. | 04-02-2009 |
20090117948 | METHOD FOR DEREVERBERATION OF AN ACOUSTIC SIGNAL - A method is provided for estimating a reverberation signal component of an acoustic signal detected by a microphone where the acoustic signal is comprised of a direct sound component and a reverberation signal component. A method for dereverberation of an acoustic signal is further provided. | 05-07-2009 |
20090247239 | DETERMINISTIC CHARACTERIZATION AND REDUCTION OF ACOUSTIC ECHO - Techniques to characterize and reduce acoustic echo are described. For example, a mobile computing device may comprise an audio characterization module to send a first signal to a first component and receive a second signal from a second component. The first signal may be a deterministic audio training sequence and the second signal may be a recovered audio training sequence. The audio characterization module compares the first signal and the second signal to determine an audio echo path. Other embodiments are described and claimed. | 10-01-2009 |
20090253468 | Apparatus for Position-Dependent Control - An apparatus for position-dependent control has a control unit, where the control unit takes the position of the apparatus as a basis for: a) controlling damping and/or echo cancellation for the apparatus, and/or b) switching a summit of the apparatus on or off or to a power saving mode, and/or c) prompting call acceptance. | 10-08-2009 |
20090264161 | Method and Earpiece for Visual Operational Status Indication - An earpiece can include an Ambient Sound Microphone (ASM), an Ear Canal Receiver (ECR), a transceiver, an illumination element, and a processor to provide visual operational mode indication via the illumination element. The operational mode can correspond to an active phone call, an incoming phone call, a terminated phone, a caller-on-hold condition, a recording mode, a voice mail mode, a mute mode, an audible transparency mode or an ear-plug mode. The intensity, frequency, amplitude, color or duration of the lighting can be adjusted according to the operational mode. Other embodiments are disclosed. | 10-22-2009 |
20100022283 | Systems and methods for noise cancellation and power management in a wireless headset - This includes systems and methods for noise cancellation and power management in a wireless headset. The wireless headset can perform noise cancellation by using two or more omni-directional microphones to generate a noise canceling “cone.” Audio signals received outside of the cone can be filtered out. An accelerometer can be used to determine the location of the wireless headset and the system can then properly position the cone to face the user's voice and filter out other audio signals. Additionally, by monitoring the ambient noise, the system can save power by turning off the noise cancellation system when the amount of ambient noise is below a threshold value. | 01-28-2010 |
20100056227 | NOISE SUPPRESSING DEVICE, MOBILE PHONE, NOISE SUPPRESSING METHOD, AND RECORDING MEDIUM - A noise suppressing device receives sound signals through a plurality of sound-receiving units and suppresses noise components included in the input sound signals. The noise suppressing device includes a detecting unit which detects a usage pattern of the noise suppressing device from a plurality of usage patterns in which positional relationships of the plurality of sound-receiving units and/or positional relationships between the plurality of sound-receiving units and a target sound source are different from each other, a converting unit which converts using environment information used in a noise suppressing process to each of the sound signals inputted by the plurality of sound-receiving units into using environment information in accordance with a usage pattern detected by the detecting unit and a suppressing unit which performs the noise suppressing process using the using environment information converted by the converting unit to the sound signals. | 03-04-2010 |
20100105447 | AMBIENT NOISE REDUCTION - The invention provides improved ambient noise reduction for ear-worn devices, such as earphones and headphones and for other devices worn upon or used in close proximity to the ear, such as cellular telephone handsets, and it provides, in particular, improvements to “feed-forward” ambient noise-reduction systems. Most feed-forward noise-reduction systems available hitherto purport to operate only below about 1 kHz and, even then, provide only relatively modest amounts of noise reduction. In accordance with this invention, predetermined filter parameters, such as the gain and cut-off frequency of a selected filter stage used in the noise-reduction processing, are mathematically modelled and the model is adjusted in real-time, in response to user-interpretation of a graphical display of a predicted residual noise amplitude spectrum. This allows the user to inspect the predicted residual noise level amplitude spectrum and to iteratively adjust the filter parameters to minimise residual noise in a chosen environment. Instead of being made manually by a user, the iterative adjustments may be automated and implemented under computer control, using known data-fitting methods and/or neural networks. | 04-29-2010 |
20100184488 | Sound signal adjuster adjusting the sound volume of a distal end voice signal responsively to proximal background noise - In a sound signal adjuster for use in telephone circuitry including a microphone capturing sound to produce a first sound signal and a loudspeaker, a second sound signal representative of a sound in a vicinity of the loudspeaker is obtained, and transitions are detected in the first and second sound signals to determine whether or not the sound in the vicinity of the loudspeaker is blocked. When the blocking is detected, a difference is calculated between a first frequency characteristic detected in response to the sound captured by the loudspeaker being determined as blocked and a second frequency characteristic detected in response to the sound captured by the loudspeaker not being determined as blocked. The difference calculated is used for suppressing a noise component included in the first sound signal. | 07-22-2010 |
20100197363 | TECHNIQUE FOR REDUCING INTERFERENCE TO RADIO OPERATIONS ON A COMPUTING DEVICE - During a telephony session, a determination is made on a mobile computing device that one or more designated conditions exist by which radio interference generated from the mobile computing device is to be reduced. In response, a power state of a set of one or more components of the mobile computing device is lowered. This reduces radio interference from those components. The set of components are ancillary to the mobile computing device's ability to maintain the telephony session, so that the telephony session is not affected by the reduction of power to the components. | 08-05-2010 |
20110124380 | METHOD AND SYSTEM FOR DOUBLE-END TALK DETECTION, AND METHOD AND SYSTEM FOR ECHO ELIMINATION - A method and system for eliminating echo in a speaker-microphone communication system are provided. The method includes the steps of: performing a noise energy estimating process on a local microphone signal in order to obtain an estimated noise signal, wherein the local microphone signal includes a local voice signal, possible background noise signal, and possible remote voice signal output from a speaker and received by a microphone; performing an echo estimating process on a remote voice signal to obtain an estimated echo signal, wherein the remote voice signal is output from the speaker; determining an error signal from the local microphone signal and the estimated echo signal; calculating a variance (σ | 05-26-2011 |
20110124381 | Headset with Auxiliary Input(s) for Cell Phone And/Or Other Devices - An active-noise-reduction (ANR) headset includes at least one auxiliary connection to an output of at least one device, such as a personal communications, computing, and/or entertainment device. An exemplary headset also includes a primary connection to a two-way radio or public-address system and circuitry for automatically suppressing or muting the volume of an auxiliary input signal relative to that of a primary input signal. Other exemplary features include a headset power supply, a microphone, a microphone preamplifier, and a device-detection circuit. The device-detection circuit selectively couples the power supply to the microphone preamplifier, enabling it to provide audio signals to the microphone input of the auxiliary device. | 05-26-2011 |
20110130176 | NOISE CANCELLATION SYSTEM - A noise cancellation system for an audio system such as a mobile phone handset, or a wireless phone headset has a first input for receiving a first audio signal from one or more microphone positioned to receive ambient noise, and a second input for receiving a second audio signal from a microphone positioned to detect the user?s speech, as well as a third input for receiving a third audio signal for example representing the speech of a person to whom the user is talking. A first noise cancellation block receives the first audio signal and generates a first noise cancellation signal, and this is combined with the third audio signal to form a first audio output signal. A second noise cancellation block receives at least a part of the first audio signal and said second audio signal and applying noise cancellation to generate a second audio output signal. | 06-02-2011 |
20110230239 | Microphone Techniques - Among other features, a boom microphone has a microphone connector; an earcup module includes an earcup connector jack to connect to a headphone and a boom lead-in to receive the microphone connector; and a control module communicates voice signals wirelessly between (a) the boom microphone and headphone and (b) a telephone. | 09-22-2011 |
20110275419 | WIRELESS HEADSET HAVING IMPROVED RF IMMUNITY TO RF ELECTROMAGNETIC INTERFERENCE PRODUCED FROM A MOBILE WIRELESS COMMUNICATIONS DEVICE - A wireless headset has improved immunity to RF electromagnetic interference produced from wireless communications devices. A headset body is adapted to be worn by a user and includes a microphone and earpiece. An antenna receives wireless communication signals and passes them to RF and audio circuitry mounted within the headset body. The RF and audio circuitry include a Bluetooth module operatively connected to the antenna for transmitting and receiving wireless communication signals, an audio CODEC connected to the Bluetooth module, and audio connection lines connected between the CODEC and the earpiece and between the CODEC and the microphone. A filter is connected into each of the audio connection lines at the earpiece and microphone and operative for reducing the RF coupling from a mobile wireless communications device. | 11-10-2011 |
20120040725 | Headset with Auxiliary Input(s) for Cell Phone And/Or Other Devices - An active-noise-reduction (ANR) headset includes at least one auxiliary connection to an output of at least one device, such as a personal communications, computing, and/or entertainment device. An exemplary headset also includes a primary connection to an aircraft two-way radio or public-address system and circuitry for automatically suppressing or muting the volume of an auxiliary input signal relative to that of a primary input signal. Other exemplary features include a headset power supply, a microphone, a microphone preamplifier, and a device-detection circuit. The device-detection circuit selectively couples the power supply to the microphone preamplifier, enabling it to provide audio signals to the microphone input of the auxiliary device. | 02-16-2012 |
20120058803 | DECISIONS ON AMBIENT NOISE SUPPRESSION IN A MOBILE COMMUNICATIONS HANDSET DEVICE - A method in a communications device includes the following operations. During a call, a process automatically detects that the device has moved from an at-the-ear position to an away-from-the-ear position. Based on the detection, a noise suppressor that operates upon an uplink signal for the call is signaled to change its noise suppression performance. Other embodiments are also described and claimed. | 03-08-2012 |
20120172094 | Mobile Communication Apparatus - A mobile communication apparatus is provided. The mobile communication apparatus includes a speaker, a sound receiving unit, an audio signal processing unit, and a control unit. The sound receiving unit provides an audio signal based on external sounds. The audio signal processing unit is connected to the speaker and the sound receiving unit to receive the first audio signal from the sound receiving unit and output a coded audio signal to the speaker. The control unit is connected to the audio signal processing unit and provides a control signal, wherein the control signal corresponds to a pre-determined mode. The control unit controls the audio signal processing unit to stop outputting the first audio signal to the speaker based on a first control signal. | 07-05-2012 |
20120276961 | MOBILE COMMUNICATION DEVICE AND ECHO CANCELLATION METHOD - According to an aspect, a mobile communication device includes a housing, a speaker, a microphone, a detecting unit, and a processing unit. The speaker is provided in the housing, and outputs an incoming voice according to an incoming voice signal. The microphone is provided in the housing. The microphone receives an outgoing voice and outputs an outgoing voice signal in response to reception of the outgoing voice. The detecting unit detects vibration of the housing and outputs a housing-vibration signal indicating the vibration of the housing. The processing unit performs echo cancellation to the outgoing voice signal based on the incoming voice signal and the housing-vibration signal. | 11-01-2012 |
20120322511 | DE-NOISING METHOD FOR MULTI-MICROPHONE AUDIO EQUIPMENT, IN PARTICULAR FOR A "HANDS-FREE" TELEPHONY SYSTEM - This method comprises the following steps in the frequency domain:
| 12-20-2012 |
20120329530 | WIRELESS HEADSET HAVING IMPROVED RF IMMUNITY TO RF ELECTROMAGNETIC INTERFERENCE PRODUCED FROM A MOBILE WIRELESS COMMUNICATIONS DEVICE - A wireless headset has improved immunity to RF electromagnetic interference produced from wireless communications devices. A headset body is adapted to be worn by a user and includes a microphone and earpiece. An antenna receives wireless communication signals and passes them to RF and audio circuitry mounted within the headset body. The RF and audio circuitry include a Bluetooth module operatively connected to the antenna for transmitting and receiving wireless communication signals, an audio CODEC connected to the Bluetooth module, and audio connection lines connected between the CODEC and the earpiece and between the CODEC and the microphone. A filter is connected into each of the audio connection lines at the earpiece and microphone and operative for reducing the RF coupling from a mobile wireless communications device. | 12-27-2012 |
20130012274 | SECOND MICROPHONE DEVICE OF A MOBILE TERMINAL - A second microphone device of a mobile terminal, and more particularly, a second microphone device of a mobile terminal for preventing various limitations caused by mounting of a second microphone, is provided. The second microphone device includes an ear jack connector having an insertion space, a microphone hole connected at one end to the insertion space, and a second microphone connected at the other end of the microphone hole, thereby improving ambient noise removal performance of the mobile terminal without adversely affecting its appearance. | 01-10-2013 |
20130012275 | ECHO CANCELLING DEVICE, COMMUNICATION DEVICE, AND ECHO CANCELLING METHOD HAVING THE ERROR SIGNAL GENERATING CIRCUIT - An echo cancelling device includes an adaptive filter which synthesizes a spurious echo signal from a receiving signal, a first subtractor which generates an echo cancellation signal based on an input signal including a voice signal of a speaker and the spurious echo signal, and an error signal generating circuit which generates an error signal based on the input signal and the echo cancellation signal. | 01-10-2013 |
20130065652 | DECISIONS ON AMBIENT NOISE SUPPRESSION IN A MOBILE COMMUNICATIONS HANDSET DEVICE - A method in a communications device includes the following operations. During a call, a process automatically detects that the device has moved from an at-the-ear position to an away-from-the-ear position. Based on the detection, a noise suppressor that operates upon an uplink signal for the call is signaled to change its noise suppression performance. Other embodiments are also described and claimed. | 03-14-2013 |
20130184036 | Echo Canceler Circuit and Method - An echo canceler circuit ( | 07-18-2013 |
20130252675 | ACTIVE NOISE CANCELLATION DECISIONS IN A PORTABLE AUDIO DEVICE - Active noise cancellation (ANC) circuitry is coupled to the input of an earpiece speaker in a portable audio device, to control the ambient acoustic noise outside of the device and that may be heard by a user of the device. A microphone is to pickup sound emitted from the earpiece speaker, as well as the ambient acoustic noise. Control circuitry deactivates the ANC in response to determining that an estimate of how much sound emitted from the earpiece speaker has been corrupted by noise indicates insufficient corruption by noise. In another embodiment, the ANC decision is in response to determining that an estimate of the ambient noise level is greater than a threshold level of an audio artifact that could be induced by the ANC. Other embodiments are also described and claimed. | 09-26-2013 |
20130273978 | Controlling Audio Signals - One or more embodiments describe controlling audio signals at a user device during a communication session between the user device and a remote node, in which a primary audio signal is received at audio input means of the user device for transmission to the remote node in the communication session. It is determined whether the user device is operating in a first or a second mode. In dependence upon determining that the user device is operating in the first mode, the secondary audio signals are selectively suppressed from being output from the user device during the communication session. | 10-17-2013 |
20130324195 | METHOD AND APPARATUS FOR A FREQUENCY DOMAIN ECHO SUPPRESSION FILTER - Residual frequency components of a reference signal are suppressed from an error signal. A magnitude of the frequency domain representation of the reference signal is divided by a magnitude of the frequency domain representation of LMS-filtered representation of the error signal to obtain a frequency domain ratio of the frequency domain representation of the reference signal to the frequency domain representation of the LMS-filtered signal. The frequency domain ratio of the frequency domain representation of the reference signal to the frequency domain representation of the LMS-filtered signal is multiplied by the frequency domain ratio of the frequency domain representation of the reference signal to the frequency domain representation of the LMS-filtered signal, to obtain a frequency domain signal having reduced residual frequency components of the reference signal. | 12-05-2013 |
20140051483 | CLOSED LOOP CONTROL SYSTEM FOR ACTIVE NOISE REDUCTION AND METHOD FOR ACTIVE NOISE REDUCTION - The invention relates to a closed loop control system for active noise reduction, comprising a speaker and an adding device connected to the speaker. A feedforward control and a feedback control each comprise a microphone for recording noise interference or for recording a sound output by the speaker. Control networks for forming a corresponding control parameter are coupled to the corresponding microphones and are connected to the adding device at the output side thereof According to the invention, the feedback control for noise reduction is adapted on the basis of a first acoustic ratio and the feedforward control for noise reduction is adapted on the basis of a second acoustic ratio.; The control network of the feedback control is designed to at least partially compensate for the control parameter of the feedforward control when current acoustic ratios change in the direction of the first acoustic ratio. | 02-20-2014 |
20140066134 | AUDIO PROCESSING DEVICE, AUDIO PROCESSING METHOD, AND RECORDING MEDIUM RECORDING AUDIO PROCESSING PROGRAM - An device includes an audio output unit, a first audio input unit, a second audio input unit that are disposed in a position closer to the audio output unit than the first audio input unit, a unit for outputting a combined signal of which audio signals from the first and second audio input unit are combined so as forming directivity in which sensitivity in a direction of the audio output unit is low when viewed from the first and second audio input units, a unit for generating artificial echo corresponding to an echo component mixed in the audio inputted to the first audio input unit, and a unit for performing an echo suppression process to the combined signal by using the artificial echo. | 03-06-2014 |
20140100001 | APPARATUS AND METHOD FOR DETECTING INSERTION OF HEADSET INTO MOBILE STATION - A mobile station is capable of detecting an insertion of a headset without a separate detection pin and removing noise generated when the headset is separated. A method includes detecting an insertion of a headset by a mobile station. An apparatus for detecting an insertion of an headset into a mobile station includes an headset attachment/detachment detecting circuit unit for transmitting an insertion signal or a separation signal to a controller by using a resistance value of the headset attached/detached to/from the mobile station; and a controller for, when an headset separation signal is received from the headset attachment/detachment detecting circuit unit, controlling such that an output of noise to the headset, which is not completely separated from the mobile station, is blocked by turning off a microphone bias. | 04-10-2014 |
20140135077 | ECHO CANCELLATION FOR ULTRASOUND - A method includes accessing signal data descriptive of a transmission sequence and pre-determined values associated with the transmission sequence. The signal data and the pre-determined values may be stored in a memory. The method includes transmitting a signal from a speaker of an electronic device according to the transmission sequence. The method includes generating a frame based on one or more signals received at a microphone of the electronic device. The one or more signals include an echo signal associated with the transmitted signal. The method includes processing the frame using the pre-determined values to produce an output frame in which a contribution associated with the echo signal is reduced. | 05-15-2014 |
20140135078 | Dynamic Speaker Management with Echo Cancellation - A system for echo cancellation includes a dynamic speaker management (DSM) module, a current/voltage sensing amplifier, a sound pressure level (SPL) model module and an echo canceller. The example DSM module is receptive to a far-end signal and is operative to develop a modified far-end signal and a plurality of parameter outputs. The example current/voltage sensing amplifier is coupled to the modified far-end signal and develops an amplifier output, a voltage (V) parameter output, and a current (I) parameter output. The example sound pressure level (SPL) model module is coupled to the plurality of parameter outputs of the of the DSM module and is operative to develop a predicted SPL. The example echo canceller module is responsive to the predicted SPL and to a near-end signal and operative to develop an echo-canceled output signal. | 05-15-2014 |
20140162731 | Subband Domain Echo Masking for Improved Duplexity of Spectral Domain Echo Suppressors - A method and system for improving a perceived duplexity of handsfree telephone applications is disclosed. An echo suppression circuit for a device comprising loudspeaker and microphone is described. A circuit attenuates a subband of a transmit signal, wherein the transmit signal is captured by the microphone and wherein the transmit signal comprises an echo of a far-end signal rendered by the loudspeaker and a near-end signal. The attenuation circuit further determines a subband far-end indicator of a voice activity in the far-end signal; determines a subband near-end indicator of a voice activity of the near-end signal; determines a subband masking weight; determines a subband attenuation for the transmit signal in the subband; and attenuates the subband of the transmit signal using the determined subband attenuation. | 06-12-2014 |
20140213329 | Mobile Phone and Method for Processing Call Signal Thereof - The present invention discloses a method for processing a call signal of a mobile phone, the method includes detecting a current call state of the mobile phone; acquiring an environmental noise signal when the mobile phone enters an earphone call state; and performing a noise reduction processing to a call signal according to the environmental noise signal for acquiring a call signal with the noise reduction processing. The present invention further discloses a mobile phone. The present invention is capable of ensuring that a user is not affected by environmental noises for guaranteeing a better quality of a call when the user makes the call with an earphone. | 07-31-2014 |
20140243048 | Compact Plug-In Noise Cancellation Device - A noise cancellation device (NCD) comprises a microphone, an analog-to-digital converter, a digital-to-analog converter, a rechargeable battery, and a processor. The NCD acquires an audio input, from an external device such as a stethoscope or a cell phone, and passes the analog data into an ADC (analog-to-digital converter) for signal conversion. The digitized signals are then passed to the processor for further processing. The processor contains all the processing functions such as preprocessing (divide the input data into frames and apply shaping function to each frame), short term Fourier transform (STFT), adaptive filtering, inverse STFT, and signal synthesis. | 08-28-2014 |
20140274218 | Apparatus with Adaptive Acoustic Echo Control for Speakerphone Mode - A method includes cycling through a plurality of microphone and speaker combinations in a mobile device in response to the mobile device being placed in speakerphone mode. The mobile device includes a plurality of microphones and at least one speaker. The method obtains acoustic echo data from an echo canceller for each microphone and speaker combination, calculates an acoustic isolation value for each combination and then selects a microphone and speaker combination based on the acoustic isolation value. The method may also include determining an echo spectrum for each microphone and speaker combination using the obtained acoustic echo data, and select an echo control profile based on a characteristic of the echo spectrum. The echo control profile is selected to further improve acoustic isolation for the selected microphone and speaker combination. | 09-18-2014 |
20140329568 | ECHO CANCELLER AND ECHO CANCELLATION METHOD - An echo canceller and an echo cancellation method are provided. The echo canceller includes a self-adaptive filter, a voice signal detection portion and a path change detection portion; a far-end voice signal is propagated in an echo path through a speaker and is picked up by a microphone to form an echo signal. The self-adaptive filter is configured to receive the far-end voice signal as a training signal to simulate the echo path, and cancel the echo signal in a near-end signal. The voice signal detection portion is configured to detect a communication status, control the self-adaptive filter according to the communication status, and control startup of the path change detection portion according to the communication status. The path change detection portion is configured to detect whether a change occurs on the echo path, and control the self-adaptive filter according to whether the change occurs on the echo path. | 11-06-2014 |
20140335917 | DUAL BEAMFORM AUDIO ECHO REDUCTION - A telephonic device having a speakerphone function has a loudspeaker and a plurality of microphones. The plurality of microphones are coupled to a plurality of beamformers which produce a first beamform having a spatial null in the direction of the loudspeaker and a second beamform having a spatial null in the direction of near-end signals. The two beamforms are then processed to facilitate echo reduction. By comparing the beamform powers, a state of double-talk can be determined and the determination can be used to enhance echo reduction associated with speakerphone functionality. | 11-13-2014 |
20140357322 | Spatial Quiescence Protection for Multi-Channel Acoustic Echo Cancellation - A system performs residual echo suppression on a microphone signal that receives, e.g., voice commands, and that is exposed to echo from multiple speakers. An example is a smartphone that receives voice commands while the smartphone is playing music through stereo speakers. The system estimates residual echo level in different ways, and determines which estimate to use. The technique responds well to the difficult to handle scenario of a spatially quiescent image suddenly transitioning to a spatially rich image. Even in the face of such difficult scenarios, the system detects and removes residual echo from the microphone signal, instead of allowing the undesired residual echo to pass through. | 12-04-2014 |
20140357323 | ECHO REMOVAL - Echo removal techniques are described. An echo path of the echo in a received audio signal is modelled using a first model to determine a first model estimate of the echo. The first model estimate is used to determine a first performance value according to a performance metric. The first performance value is compared with a threshold value. It is determined if the echo path can be deemed linear based on the comparison. If so, the first model estimate of the echo is used to remove the echo in the received audio signal. Otherwise, the echo path of the echo is switched to be modelled using a second model to determine a second model estimate of the echo, and the second model estimate of the echo is used to remove the echo in the received audio signal. | 12-04-2014 |
20140357324 | ECHO REMOVAL - Echo removal techniques are described. As part of the echo removal, an adaptive model estimate of the echo in a received audio signal is determined using an adaptive model based on an outputted audio signal and the received audio signal. The adaptive model executes an algorithm comprising a convergence parameter to determine filter coefficients and uses said filter coefficients to filter the outputted audio signal to determine the adaptive model estimate of the echo. An accuracy value of the adaptive model is determined according to an echo return loss enhancement metric. The convergence parameter is updated based on the accuracy value. The adaptive model estimate of the echo is used to remove the echo in the received audio signal. | 12-04-2014 |
20140357325 | ECHO REMOVAL - Echo removal techniques are described. As part of the echo removal, a first model estimate of the echo in the received audio signal is determined using a first model and a second model estimate of the echo is determined using a second model. A first accuracy value of the first model is determined according to a model accuracy measure, and a second accuracy value of the second model is determined according to the model accuracy measure. It is then determined if the first model is more accurate than the second model based on a comparison of the first accuracy value and the second accuracy value and the second model is selectively updated based on said comparison. Echo removal is applied to the received audio signal using only the second model estimate of the echo. | 12-04-2014 |
20140357326 | ECHO SUPPRESSION - An echo path of the echo in a received audio signal is modelled using an adaptive model to determine an adaptive model estimate of the echo. The adaptive model estimate is used to determine an estimate of the echo power of the echo in the received audio signal. The power of the received audio signal is determined. The estimate of the echo power and the determined power of the received audio signal are used to determine echo suppression gains. Temporal smoothing is applied to one or more of the echo suppression gains and the one or more smoothed echo suppression gains are used to apply echo suppression to the received audio signal, thereby suppressing the echo in the received audio signal, wherein the amount of smoothing applied to the echo suppression gains is varied according to a non-decreasing function of the frequency of the received audio signal. | 12-04-2014 |
20150011266 | COMMUNICATION DEVICE WITH ECHO SUPPRESSION - The application relates to a communication device, e.g. a speakerphone, comprising a microphone signal path, MSP, and a loudspeaker signal path, SSP, the microphone signal path comprising a microphone unit, an MSP-filter, and a transmitter unit operationally connected to each other and configured to transmit a processed signal originating from an input sound picked up by the microphone, the loudspeaker signal path comprising a receiver unit, an SSP-filter, and a loudspeaker unit operationally connected to each other and configured to provide an acoustic sound signal originating from a signal received by the receiver unit. The communication device comprises a control unit for dynamically controlling the filtering characteristics of the MSP and SSP-filters based on one or more control input signals. This has the advantage of providing a simple and flexible scheme for decreasing echo in a communication device, while ensuring an acceptable sound quality in the transmitted signal. | 01-08-2015 |
20150050967 | Acoustic Echo Cancellation for Audio System with Bring Your Own Devices (BYOD) - A controller for the conference session receives at least one audio signal to generate a speaker signal. The controller correlates the speaker signal with network timing information and generates speaker timing information. The controller transmits the correlated speaker signal and timing information to a mobile device participating in the conference session. The mobile device generates an echo cancelled microphone signal from a microphone of the mobile device, and transmits the echo cancelled signal back to the controller. The controller also receives array microphone signals associated with an array of microphones at known positions in the room. The controller removes acoustic echo from the array microphone signals, and estimates a relative location of the mobile device. The controller dynamically selects as audio output corresponding to the mobile device location either (a) the array microphone signal, or (b) the echo cancelled microphone signal from the mobile device. | 02-19-2015 |
20150126255 | UNIVERSAL RECONFIGURABLE ECHO CANCELLATION SYSTEM - A universal reconfigurable system and method are provided for reducing nonlinear echo and residual echo, and for echo leakage prevention in various time-varying and complex environments is proposed in this invention. According to one embodiment an echo cancellation system includes (1) an adaptive linear filter implemented in either time-domain or frequency-domain; (2) a nonlinear echo suppression; (3) echo leakage prevention; (4) direct current (DC), low frequency residual echo and noise reduction; (5) time-domain nonlinear processor (NLP) to reduce the residual echo; and (6) frequency-domain NLP to further reduce the residual echo. The echo cancellation system is universally applicable to acoustic echo cancellation (AEC) and/or electrical echo cancellation applications. In terms of AEC, this invention is reconfigurable for one or more microphones and/or one or more reference channels. The numbers of microphones and reference channels are user configurable. | 05-07-2015 |
20150350395 | DETECTING AND SWITCHING BETWEEN NOISE REDUCTION MODES IN MULTI-MICROPHONE MOBILE DEVICES - A method of switching between noise reduction modes in multi-microphone mobile devices may include receiving a first sound signal at a first sound receiver and receiving a second sound signal at a second sound receiver. The method may also include determining a first power value associated with the first sound signal and determining a second power value associated with the second sound signal. The method may additionally include comparing the first power value to the second power value and switching between a single-microphone noise reduction mode and a dual-microphone noise reduction mode based on the comparison. | 12-03-2015 |
20160050304 | Mobile terminal and method for controlling answer mode of the mobile terminal and non-transitory computer-readable storage medium - The present disclosure relates to a method for controlling answer modes of a mobile terminal, a mobile terminal and a storage medium. The method includes: a hand free mode is enabled; it is determined through the motion sensor whether or not the mobile terminal is picked up in case where the hand free mode has been enabled and a receiver mode is not enabled; the receiver mode is enabled and the hand free mode is kept being enabled based on a determination that the mobile terminal is picked up; it is determined through the proximity sensor whether or not the mobile terminal is covered in case where both of the receiver mode and the hand free mode are enabled; and the hand free mode is disabled and the receiver mode is kept being enabled based on a determination that the mobile terminal is covered. | 02-18-2016 |
20160072936 | ELECTRONIC DEVICE AND SYSTEM INCLUDING THE SAME - An electronic device and a system including the same are disclosed. An electronic device of the present invention includes: a body; a plurality of supports each of which is coupled to the body through one side thereof; and a holder configured to connect other sides of the plurality of supports having a curved portion corresponding to the shape of the ear of a user and fitted in the ear of the user, wherein at least one of the plurality of supports rotates on the body, wherein the radius of the holder is changed according to rotation of the at least one of the plurality of supports. According to the present invention, the supports coupled to the body rotate to be fixed to the user's ear. | 03-10-2016 |
20160119460 | Reduced Acoustic Coupling - An apparatus comprising: at least one speaker; and at least one microphone, wherein there is an acoustic coupling between the at least one speaker and the at least one microphone; at least one location defined by the at least one acoustic coupling between the apparatus at least one speaker and the apparatus at least one microphone; and at least one dampening element at the determined location, such that the at least one acoustic coupling between the at least one speaker and the at least one microphone is substantially reduced. | 04-28-2016 |
20160127535 | SYSTEM AND METHOD OF DOUBLE TALK DETECTION WITH ACOUSTIC ECHO AND NOISE CONTROL - System of improving sound quality includes loudspeaker, microphone, accelerometer, acoustic-echo-cancellers (AEC), and double-talk detector (DTD). Loudspeaker outputs loudspeaker signal including downlink audio signal from far-end speaker. Microphone generates microphone uplink signal and receives at least one of: near-end speaker, ambient noise, and loudspeaker signals. Accelerometer generates accelerometer-uplink signal and receives at least one of: near-end speaker, ambient noise, and loudspeaker signals. First AEC receives downlink audio, microphone-uplink and double talk control signals, and generates AEC-microphone linear echo estimate and corrected AEC-microphone uplink signal. Second AEC receives downlink audio, accelerometer uplink and double talk control signals, and generates AEC-accelerometer linear echo estimate and corrected AEC-accelerometer uplink signal. DTD receives downlink audio signal, uplink signals, corrected uplink signals, linear echo estimates, and generates double-talk control signal. Uplink audio signal including at least one of corrected microphone-uplink signal and corrected accelerometer-uplink signal is generated. Other embodiments are described. | 05-05-2016 |
20160205263 | Echo Cancellation Method and Apparatus | 07-14-2016 |