Abstract: An acoustic processing device includes a first signal processing unit that generates a positive signal to be supplied to a positive electrode terminal of a first speaker and a positive electrode terminal of a second speaker, by using input audio signals from a first group of microphones, and a second signal processing unit that generates a negative signal to be supplied to a negative electrode terminal of the first speaker and a negative electrode terminal of the second speaker, by using input audio signals from a second group of microphones.

Abstract: Provided is a technique to generate a call environment that prevents call contents from being heard by a person other than a person speaking on the phone in a case where call voice is output from a speaker. Speakers installed in an automobile are denoted by SP1, . . . , SPN, a first filter coefficient used to generate an input signal for a speaker SPn is denoted by Fn(?), and a second filter coefficient that is different from the first filter coefficient and is used to generate an input signal for the speaker SPn is denoted by {tilde over (?)}Fn(?).

Abstract: An electronic device is disclosed which may collect inertia information and ambient sound, determine whether a user is in danger by monitoring impact sound and a mismatch between a head orientation and a moving direction of a user, and provide the ambient sound collected when it is determined that the user is in danger.

Abstract: A first input signal captured by one or more sensors associated with an ANR headphone is received. A frequency domain representation of the first input signal is computed for a set of discrete frequencies, based on which a set of parameters is generated for a digital filter disposed in an ANR signal flow path of the ANR headphone, the set of parameters being such that a loop gain of the ANR signal flow path substantially matches a target loop gain. Generating the set of parameters comprises: adjusting a response of the digital filter at frequencies (e.g., spanning between 200 Hz-5 kHz). A response of at least 3 second order sections of the digital filter is adjusted. A second input signal in the ANR signal flow path is processed using the generated set of parameters to generate an output signal for driving the electroacoustic transducer of the ANR headphone.

Abstract: A hearing assistance device may be turned on or off in response to a change in magnetic field or detection of a gesture. A magnetic sensor may be used to identify a change in a magnetic field. An inertial measurement unit or other force sensor may be used to detect a gesture. In response to the magnetic field change or gesture, a hearing assistance device may be caused to change a device function or change a device power mode.

Abstract: A method for feedforward noise cancellation in an enclosed space within a structure is provided. The method comprises placing a microphone array inside an inner surface of the enclosed space and conducting modal testing on an outside surface of the enclosed space, wherein the modal testing comprises multiple incoherent noise sources corresponding to locations of microphones in the microphone array. Noise generated by the modal testing is processed to create a number of acoustic mathematical models of the enclosed space. In response to incoherent noise within the enclosed space, a noise canceling signal is generated according to an output of the mathematical models.

Abstract: An acoustic reproduction method includes: localizing a first sound image at a first position in a target space in which a user is present; and localizing, at a second position in the target space, a second sound image that represents an anchor sound for indicating a reference position.

Abstract: Aspects of the disclosure relate to voice activity detection (VAD) on wearable and other resource-constrained devices, to classify speech recorded by a microphone of the device as belonging to a wearer of the device versus another speech source. A computing device can include a microphone and an inertial measurement unit (IMU). The wearable device can use signals measured by the IMU for providing motion-tracking features, such as head tracking for augmented reality or virtual reality applications. Aspects of the disclosure provide for a device for leveraging existing data collected for these motion-tracking features for use in VAD. A device can pre-process data streamed from an IMU to use only signals predetermined to be indicative of whether or not a wearer of the device is speaking.

Abstract: A hearing protection apparatus, a related method, and a server device is disclosed. The hearing protection apparatus comprises a set of microphones comprising a first microphone and a second microphone; a first positioning device for provision of first position data of the hearing protection apparatus; and a communication device connectable to the first microphone and the second microphone and the first positioning device, the communication device comprising a processing unit and an interface; wherein the processing unit is configured to: obtain a first audio input signal from the first microphone and a second audio input signal from the second microphone; determine first audio data based on the first audio input signal and the second audio input signal; and transmit the first audio data and the first position data to a radio unit.

Abstract: Managing noise during an online conference session includes obtaining audio data from an endpoint participating in an online conference session. The audio data is derived from audio captured at the endpoint that includes musical sounds. The audio data is processed to identify a portion of the audio data in which a decibel level of the musical sounds is stable for a period of time. Non-musical noise present, if any, in the audio data with the musical sounds is identified and the non-musical noise is attenuated from the audio data to generate noise-reduced musical audio data. The noise-reduced musical audio data is transmitted for play out at one or more other endpoints participating in the online conference session.

Abstract: A wireless audio device is provided. The wireless audio device includes an audio receiving circuit, an audio output circuit, an acceleration sensor, a communication circuit, a processor, and a memory. The memory may store instructions that, when executed by the processor, cause the wireless audio device to detect an utterance of a user of the wireless audio device by using the acceleration sensor, enter a dialog mode in which at least some of ambient sounds received by the audio receiving circuit are output through the audio output circuit, in response to detecting the utterance of the user, and end the dialog mode if no voice is detected for a specified time or longer by using the audio receiving circuit in the dialog mode.

Abstract: An audio system for an ear mountable playback device comprises a speaker and an error microphone that is configured to sense sound being output from the speaker and ambient sound. The audio system further comprises a detection engine that is configured to determine a driver response between the speaker and the error microphone, and to estimate a leakage condition from the determined driver response.

Abstract: This application discloses a method for reducing an occlusion effect of an earphone, and a related apparatus. The method is applied to an earphone having at least one microphone and a speaker. The method includes: detecting an occurrence of at least one of the following events: a user speaks and the user is in motion; and triggering at least one of the following operations in response to the at least one event: processing the user's sound signal based on the at least one microphone to suppress an occlusion effect of the earphone, and playing an audio by using the speaker, to mask a sound signal in the user's auditory canal. Embodiments of this application can reduce or even eliminate the earphone occlusion effect, to improve user experience.

Abstract: There is provided an ear cup including a housing containing a filter assembly and a motor-driven impeller for creating an airflow through the filter assembly, the housing including an air outlet downstream from the filter assembly for emitting the filtered airflow from the housing. The ear cup further includes an acoustic driver carried by or mounted to, either directly or indirectly, the housing, a reference internal noise sensor disposed within the housing, and a reference ambient noise sensor carried by or mounted to, either directly or indirectly, the housing. The ear cup further includes active noise control circuitry that is configured, in a first operating state, to use a signal provided by the reference internal noise sensor to operate the acoustic driver and, in a second operating state, to use a signal provided by the reference ambient noise sensor to operate the acoustic driver.

Abstract: A biological information monitoring system includes: a biological information monitoring apparatus that monitors biological information of an organism wearing the biological information monitoring apparatus on an ear; and a charger that charges the biological information monitoring apparatus in a non-contact manner. The charger charges the biological information monitoring apparatus when the biological information monitoring apparatus is not monitoring biological information.

Abstract: The disclosure is generally directed to a system for reducing wind noise. A system includes one or more processors coupled to a non-transitory computer-readable storage medium having instructions encoded thereon that, when executed by the one or more processors, cause the one or more processors to obtain signals respectively generated from two or more microphones during a time period, the signals representing acoustic energy detected by the two or more microphones during the time period, determine a coherence between the signals, and determine a filter based on the coherence. The filter is configured to reduce wind noise in one or more of the signals.

Abstract: An active noise reduction device reduces noise in a space in an automobile. The active noise reduction device includes: a reference signal input terminal that receives a reference signal outputted by a reference signal source and having a correlation with the noise, the reference signal source being attached to the automobile; a compressor that compresses and outputs the reference signal received by the reference signal input terminal and having an amplitude greater than or equal to a threshold; an adaptive filter unit that applies an adaptive filter to the reference signal outputted from the compressor to generate a canceling signal to be used to output a canceling sound for reducing the noise; and a filter coefficient updater that updates a coefficient of the adaptive filter.

Abstract: A crosstalk cancellation filter set configured for use in delivering binaural signals to human ears is provided. The crosstalk cancellation filter set includes a pressure matching system configured to perform spatial filtering or sound field control and an obstructed field model in communication with the pressure matching system. The crosstalk cancellation filter set is configured to take acoustic advantage of scattering effects and occlusional effects caused by violations to a free-field assumption, thereby delivering improved crosstalk cancellation acoustic displays to a listener without the use of headphones.

Abstract: An adaptive noise-canceling system generates an anti-noise signal from a noise reference signal with a feed-forward filter that filters the noise reference signal to produce the anti-noise signal. The feed-forward filter has a first response controlled by a set of first coefficients. The adaptive noise-canceling system includes a measurement subsystem for measuring a characteristic of an acoustic environment of the adaptive noise-canceling system, a classifier for classifying the characteristic of the acoustic environment by analyzing an output of the measurement subsystem, and a controller that provides the set of first coefficients to the feed-forward filter in conformity with an output of the classifier.

Abstract: The present disclosure is related to a method and system for a room calibration in a speaker system using an internal microphone. The method comprises calculating an impulse response of a sound signal received at an internal microphone from at least one speaker, and performing the room calibration based on the calculated impulse response.

Abstract: Embodiments of the present application provide a method and system for active noise control, which can meet different needs of different consumers on sound quality of headphones. The method includes: determining an expected noise control curve of performing active noise control on a target object; determining a target filter according to the expected noise control curve and a filter model; and performing noise control processing on an external noise signal using the target filter.

Abstract: The present invention includes: a housing that includes an arrangement case in which an internal space is formed, and a sound guide tube in which a sound conduction space is formed; a feedback microphone to which an external sound is input; a first speaker unit that outputs a sound; and a second speaker unit that outputs a sound in an output band different from an output band of the sound output from the first speaker unit. The housing has inside a first space and a second space, the feedback microphone and the first speaker unit are arranged in the first space, the second speaker unit is arranged in the second space, and an equalizer that partitions the first space and the second space is disposed between the first speaker unit and the second speaker unit.

Abstract: The present disclosure provides a method for evaluating an electronic device. The method comprises determining, with an acoustic tube, a value of a first parameter, the value of the first parameter being indicative of the acoustic impedance of a reference termination. The method further comprises determining, with the acoustic tube, a value of a second parameter, the value of the second parameter being indicative of the acoustic impedance of the reference termination, when occluded by the electronic device. The method then comprises calculating a value of a third parameter, the value of the third parameter being indicative of the acoustic impedance of the electronic device, based on the value of the first parameter and the value of the second parameter.

Abstract: An earmuff module of a headphone includes a back cover, a sound-receiving hole, a microphone assembly, and an earmuff. The back cover includes a peripheral side wall. The sound-receiving hole is formed on the peripheral side wall of the back cover and penetrates through the peripheral side wall. The microphone assembly is disposed on an inner surface of the peripheral side wall and corresponds to the sound-receiving hole, and is acoustically connected with the sound-receiving hole. The earmuff is detachably assembled on the back cover, and the earmuff includes a foam and a wrapping cover. The wrapping cover includes an extension part and a covering part. The covering part covers the foam. The extension part extends from one end of the covering part to an outer surface of the peripheral side wall and covers the sound-receiving hole. The microphone assembly is located within a range covered by the extension part.

Abstract: A head-mounted audio output apparatus comprising: a hybrid audio system comprising multiple transducers, wherein the hybrid audio system is configured to render sound for a user of the apparatus into different audio output channels using different associated transducers; means for automatically changing a cut-off frequency of a first one of the audio output channels in dependence upon the transducer associated with the first one of the audio output channels.

Abstract: An audio system for an ear mountable playback device comprises a speaker, an error microphone configured to predominantly sense sound being output from the speaker and a further microphone configured to predominantly sense ambient sound. The system further comprises a first noise filter coupling the further microphone to the speaker, a second noise filter coupling the error microphone to the speaker and an adaptation engine. The adaptation engine is configured to adapt a response of the first noise filter depending on error signals from at least the error microphone, estimate a leakage condition from the response of the first noise filter, and adapt a response of the second noise filter depending on the estimated leakage condition.

Abstract: Aspects relate to systems and methods for dynamic active noise reduction including at least a sensor configured to sense a physiological characteristic of a user and transmit a physiological signal correlated to the sensed physiological characteristic, at least an environmental microphone configured to transduce an environmental noise to an environmental noise signal, a processor configured to receive the environmental noise signal, generate a noise-reducing sound signal as a function of the environmental noise signal, and, modify the noise-reducing sound signal as a function of the physiological signal, and a speaker configured to transduce a noise-reducing sound from the modified noise-reducing sound signal.

Abstract: An audio system for an ear mountable playback device includes a speaker, an error microphone, which senses sound being output from the speaker, and a sound control processor. The processor is configured for controlling and/or monitoring a playback of a detection signal or a filtered version of the detection signal via the speaker, recording an error signal from the error microphone, and determining whether the playback device is in a first state, where the playback device is worn by a user, or in a second state, where the playback device is not worn by a user, based on processing of the error signal.

Abstract: A noise reduction system is provided. The noise reduction system may include a sub-band noise sensor, a plurality of sub-band noise reduction modules, and an output module. The sub-band noise sensor may be configured to detect a noise and generate a plurality of sub-band noise signals in response to the detected noise. Each of the plurality of sub-band noise signals may have a distinctive sub-band of the frequency band of the noise. Each of the sub-band noise reduction modules may be configured to receive one of the sub-band noise signals from the sub-band noise sensor and generate a sub-band noise correction signal for reducing the received sub-band noise signal. The output module may be configured to receive the sub-band noise correction signals and output a noise correction signal for reducing the noise based on the sub-band noise correction signals.

Abstract: An active noise reduction device includes: a reference signal input terminal that receives a reference signal from a reference signal source attached to an automobile; a simulated vibration transfer characteristics filter unit that generates a second signal by correcting, using simulated vibration transfer characteristics, a first signal for outputting, from a loudspeaker attached to the automobile, a sound different from a canceling sound, the simulated vibration transfer characteristics simulating vibration transfer characteristics from the loudspeaker to the reference signal source; a first subtracter that outputs a corrected reference signal obtained by subtracting the second signal generated, from the reference signal received by the reference signal input terminal; and an adaptive filter unit that applies an adaptive filter to the corrected reference signal outputted from the first subtracter to generate a canceling signal to be used to output the canceling sound.

Abstract: An active noise control apparatus of vehicles capable of making it difficult for a passenger in a vehicle to hear the voice of another passenger, achieving privacy protection, and a method of controlling the same are disclosed. The active noise control method includes primarily determining a noise level based on a first microphone signal input through a microphone corresponding to a first seat, secondarily determining whether to output an anti-noise signal generated based on the first microphone signal and the magnitude of the anti-noise signal based on the noise level and the level of the first microphone signal, and outputting the anti-noise signal through a headrest speaker of a second seat in response to the secondary determining.

Abstract: An ear cup housing has several reference microphones, an error microphone and a speaker. A processor drives the speaker for acoustic noise cancellation and transparency, by processing the microphone signals, and performs an oversight process by adjusting the reference microphone signals in response to detecting wind noise events and scratch events. In another aspect, the ear cup housing has an outside face that is joined to an inside face by a perimeter and the reference microphones are on the perimeter. Other aspects are also described and claimed.

Abstract: A hearing device system includes: first and second hearing devices, each of which comprising at least one microphone, a primary antenna, and a speaker; the hearing device system configured to communicate with an electronic device configured to establish a call between the user and a far-end person; the hearing device system configured to determine a first noise level, N1, of sound received by the at least one microphone of the first hearing device, and a second noise level, N2, of sound received by the at least one microphone of the second hearing device; the hearing device system configured to transmit a voice signal to the electronic device, the voice signal being based on a voice of the user captured by the at least one microphone of the first hearing device when N1<N2, or captured by the at least one microphone of the second hearing device when N1>N2.

Abstract: An apparatus for hearing protection comprises a pair of earpads, a band, microphones, speakers, vibration generators, and a processing unit. Each of the earpads is placed over an ear of the user. The band extends between the pair of earpads. The microphones convert acoustic signals into electrical signals. The speakers are located on each of the pair of earpads and direct sound towards the ear. The vibration generators are located on at least one of the pair of earpads and generate vibratory feedback to the user. The processing unit is connected to the microphones, the speakers, and the vibration generators, and compares first parameters of the electrical signals from the microphones with second parameters of predetermined warning sounds to determine whether the electrical signals comprise one or more of the predetermined warning sounds.

Abstract: The present disclosure relates to the technical field of earphone and provides to an active noise reduction earphone. The active noise reduction earphone includes an earphone shell, a speaker, a sound outlet mouth, a first feedback digital microphone, a second feedback digital microphone and a sound collecting channel. Herein, the speaker divides the earphone shell into the front speaker cavity and the back speaker cavity; the sound outlet mouth is arranged to be faced to the speaker to output the sound emitted by the speaker; the first feedback digital microphone is arranged at the first noise reduction sound collecting hole preset in the back speaker cavity to collect external ambient noise; the sound in the ear canal is collected through the sound collecting channel, and the second feedback digital microphone isolates the sound collecting channel from the front speaker cavity.

Abstract: A bone conduction audio apparatus includes at least one ear hook assembly. A main circuit board is provided in the ear hook assembly. Each ear hook assembly includes an operating unit, a line concentrator and a bone conduction transducer. Each operating unit is electrically connected with corresponding line concentrator by contact springs or connecting wires, and connected with the main circuit board via the line concentrator. Each bone conduction transducer is electrically connected with the main circuit board via corresponding line concentrator. A controller of the main circuit board receives touch signals from all operating units to determine and initiate relating earphone operating. The bone conduction audio apparatus adopts bilateral triggering interaction mechanism. The line concentrator is combined with the suspended bone conduction transducer.

Abstract: An audio system for a headset includes a plurality of speakers and an audio controller. The plurality of speakers may be in a dipole configuration that cancel sound leakage into a local area of the headset. The controller filters audio content presented by the plurality of speakers to further mitigate leakage of audio content into the local area. The audio determines sound filters based on environmental conditions, such as ambient noise levels, as well as based on the audio content being presented.

Abstract: A headphone device comprising active noise cancellation means (ANC) having a feedback (FB) signal path, a feed forward (FF) signal path and a sidetone signal path, where the headphone is provided with a control member (1, 11) that can be displaced or rotated between opposite positions, where the control member (1, 11) is configured such that the gain of the FF signal path and the gain of the sidetone signal path are controllable by the control member (1, 11) in such manner that when the control member (1, 11) is at one extreme position, the gain of the FF signal path is maximum and the gain of the sidetone signal path is minimum and when the control member (1,11) is at the opposite extreme position, the gain of the FF signal path is minimum and the gain of the sidetone signal path is maximum.

Abstract: A computer-implemented method for automatically optimizing a hybrid active noise cancellation system, the hybrid active noise cancellation system comprising a feedback filter and a feedforward filter, the method comprising optimizing the feedforward filter, thereby optimizing the hybrid active noise cancellation system, wherein optimization of the feedforward filter is dependent on the feedback filter.

Abstract: A method for reducing noise includes: obtaining a priori signal-to-noise ratio of air-bone integration, the priori signal-to-noise ratio of air-bone integration being obtained by integrating air conduction parameters of the current frame, bone conduction parameters of the current frame and air conduction noise parameters of the current frame; calculating a noise reduction gain according to the priori signal-to-noise ratio of air-bone integration; and performing noise reduction operation according to the noise reduction gain and the air conduction parameters of the current frame.

Abstract: A user content audio signal is converted into sound that is delivered into an ear canal of a wearer of an in-ear speaker, while the in-ear speaker is sealing off the ear canal against ambient sound leakage. An acoustic or venting valve in the in-ear speaker is automatically signaled to open, so that sound inside the ear canal is allowed to travel out into an ambient environment through the valve, while activating conversion of an ambient content audio signal into sound for delivery into the ear canal. Both user content and ambient content are heard by the wearer. The ambient content audio signal is digitally processed so that certain frequency components have been gain adjusted, based on an equalization profile, so as to compensate for some of the insertion loss that is due to the in-ear speaker blocking the ear canal. Other embodiments are also described and claimed.

Abstract: In one aspect a method that includes receiving an input signal captured by one or more first sensors associated with an active noise reduction (ANR) device, and processing the input signal using a first filter disposed in an ANR signal path to generate a first signal for an acoustic transducer of the ANR device. The input signal is processed in a pass-through signal path disposed in parallel with the ANR signal path to generate a second signal for the acoustic transducer, wherein the pass-through signal path allows a portion of the input signal to pass through to the acoustic transducer in accordance with a variable gain. One or more second sensors detect an existence of a condition likely to cause instability in the pass-through signal path, and in response, the variable gain is adjusted. A driver signal for the acoustic transducer is generated using an output based on the adjusted gain.

Abstract: An apparatus, method and computer program product for: providing spatial audio signals for output for a first user via a first audio device and a second audio device, receiving an indication of deactivation of the second audio device, receiving an indication that the second audio device is re-activated by a second user, and performing, in response to receiving the indication that the second audio device is re-activated by the second user, a modification of the spatial audio signals.

Abstract: Aspects include identifying each of a plurality of audio sources proximate to a user wearing a headset. The audio sources include a primary audio source and a plurality of background audio sources. Aspects include causing the headset to play a set of audio sources to the user by causing each audio source of the set to be unfiltered by the headset. Aspects include determining an acceptance level of the user. Aspects also include determining a background noise filtering adjustment based on the acceptance level and the set of audio sources being played by the headset to the user. Aspects also include causing the headset to adjust a filtering of one or more of the plurality of background audio sources by the headset based on the background noise filtering adjustment.

Abstract: A first input signal captured by one or more sensors associated with an ANR headphone is received. A frequency domain representation of the first input signal is computed for a set of discrete frequencies, based on which a set of parameters is generated for a digital filter disposed in an ANR signal flow path of the ANR headphone, the set of parameters being such that a loop gain of the ANR signal flow path substantially matches a target loop gain. Generating the set of parameters comprises: adjusting a response of the digital filter at frequencies (e.g., spanning between 200 Hz-5 kHz). A response of at least 3 second order sections of the digital filter is adjusted. A second input signal in the ANR signal flow path is processed using the generated set of parameters to generate an output signal for driving the electroacoustic transducer of the ANR headphone.

Abstract: A method for tuning filter parameters of a noise cancellation enabled audio system with an ear-mountable playback device comprising a speaker and a feedback noise microphone located in proximity to the speaker comprises provision of acoustic transfer functions between the speaker and the feedback noise microphone, between the speaker and an eardrum, between an ambient sound source and the eardrum and between the ambient sound source and the feedback noise microphone. The parameters of a feedback filter function, which is designed to process a feedback noise signal, are tuned. A noise cancellation performance of the audio system at the eardrum is determined based on each of the acoustic transfer functions and on the feedback filter function.

Abstract: A crosstalk cancellation filter set configured for use in delivering binaural signals to human ears is provided. The crosstalk cancellation filter set includes a pressure matching system configured to perform spatial filtering or sound field control and an obstructed field model in communication with the pressure matching system. The crosstalk cancellation filter set is configured to take acoustic advantage of scattering effects and occlusional effects caused by violations to a free-field assumption, thereby delivering improved crosstalk cancellation acoustic displays to a listener without the use of headphones.

Abstract: Methods for calibrating active noise-cancelling headphones, including placing the active noise-cancelling headphones on a measuring device; exciting the active noise-cancelling filter; measuring one or more relevant transmission pathways selected from x(n), m(n), and p(n) for feedforward and/or h(n) for feedback; defining at least one goal function for feedforward or feedback; calculating a complementary function for the defined goal function for at least one branch of the active noise-cancelling filter; calculating an impulse response of the complementary function from the measurements of the relevant transmission pathways; approximating operating parameters for the active noise-cancelling filter using the Prony method; and implementing the approximated operating parameters in the active noise-cancelling filter on the signal processor in order to create an approximated complementary active noise-cancelling filter, thereby calibrating the active noise-cancelling headphones.

Abstract: Playback devices such as headphone devices can include an earpiece configured to be positioned adjacent a user's ear. The earpiece can include a transducer having a diaphragm configured to face toward the user's ear when the earpiece is positioned adjacent the user's ear, as well as an outlet vent in fluid communication with the transducer and a microphone. A support member within the earpiece includes a first opening aligned with the microphone and a second opening aligned with the outlet vent. An acoustic mesh extends over the first opening and the second opening, wherein the mesh has a substantially uniform acoustic impedance.

Abstract: An audio apparatus, e.g. for rendering audio for a virtual/augmented reality application, comprises a receiver (201) for receiving audio data for an audio scene including a first audio component representing a real-world audio source present in an audio environment of a user. A determinator (203) determines a first property of a real-world audio component from the real-world audio source and a target processor (205) determines a target property for a combined audio component being a combination of the real-world audio component received by the user and rendered audio of the first audio component received by the user. An adjuster determines a render property by modifying a property of the first audio component indicated by the audio data for the first audio component in response to the target property and the first property. A renderer (209) renders the first audio component in response to the render property.