Abstract: Noise reduction circuitry for a communication apparatus can apply different noise reduction transfer functions, depending on whether a listening device is connected to the apparatus. If no listening device is connected, the noise reduction transfer function can be adapted for use with microphones and speakers that form an integral part of the communication apparatus, which may be a cellular telephone. If a listening device is connected, the noise reduction transfer function can be adapted for use with microphones and speakers that form a part of the listening device. This allows the noise reduction circuitry to provide improved noise reduction performance.

Abstract: An in-ear noise dosimeter in the form of an earplug which senses sound in the ear canal using an eartip which has a sound delivery channel that couples sound at the end closest to the eardrum to an earplug microphone. The earplug can communicate wirelessly with a remote data collection and processing system. A dock unit for storing the earplugs when not worn can compensate for differences in unoccluded-ear versus occluded-ear responses by an acoustic compensator. An electronic compensation filter can be modified by a proximity switch in the earplug which changes state when the earplug is worn in the ear versus stored in a dock unit. The dosimeter can also have a temperature sensor for sensing human body temperature and remotely-located wireless LEDs used to alert the user of high noise dosage. Data can also be downloaded from the earplug using a reader unit.

Abstract: An audio accessory having a locally stored and executed policy. The policy includes a rule related to audio output generation. The audio accessory can be a peripheral audio accessory, and the policy can be stored on the peripheral audio accessory so that the policy can be applied to communications from any source.

Abstract: A speaker box is provided in the present disclosure. The speaker box comprises a shell, a speaker, a sound guiding channel, an auxiliary sound cavity, a baffle and a cover plate. The diaphragm separates the receiving space into a front sound cavity and a rear cavity, the sound guiding channel connects the front sound cavity with the outside and forms a front cavity. The auxiliary sound cavity is provided with a first through hole communicating with the front cavity and a second through hole communicating with the outside, and the baffle is completely covered the first through hole. The baffle is provided with a channel therethrough and the auxiliary sound cavity is communicated with the front cavity through the channel. The cover plate completely covers the second through hole. Compared with the related art, the high frequency acoustic performance of the speaker box of the present disclosure is excellent.

Abstract: In accordance with some embodiments, an apparatus for privacy protection is provided. The apparatus includes an audio output device arranged to output sound directed to an audio input device of a second device. The apparatus further includes an audio coupling interface arranged to provide a cavity for the audio output device and the audio input device of the second device. The apparatus also includes a spectral shaper, coupled to the audio output device, operable to apply a spectral envelope to an audio signal in order to produce a shaped audio signal, wherein the shaped audio signal is selectively coupled to the audio output device.

Abstract: Various implementations include approaches for demonstrating wearable audio device capabilities. In particular aspects, a computer-implemented method of demonstrating a feature of a wearable audio device includes: receiving a command to initiate an audio demonstration mode at a demonstration device; initiating binaural playback of a demonstration audio file at wearable playback device being worn by a user and initiating playback of a corresponding demonstration video file at a video interface coupled with the demonstration device; receiving a user command to adjust a demonstration setting at the demonstration device to emulate adjustment of a corresponding setting on the wearable audio device; and adjusting the binaural playback at the wearable playback device based upon the user command.

Abstract: In some embodiments, a method, apparatus and computer program for reducing noise from an audio signal captured by a drone (e.g., canceling the noise signature of a drone from the audio signal) using a model of noise emitted by the drone's propulsion system set, where the propulsion system set includes one or more propulsion systems, each of the propulsion systems including an electric motor, and wherein the noise reduction is performed in response to voltage data indicative of instantaneous voltage supplied to each electric motor of the propulsion system set. In some other embodiments, a method, apparatus and computer program for generating a noise model by determining the noise signature of at least one drone based upon a database of noise signals corresponding to at least one propulsion system and canceling the noise signature of the drone in an audio signal based upon the noise model.

Abstract: A method provides binaural sound to a person through electronic earphones. The binaural sound localizes to a sound localization point (SLP) in empty space that is away from but proximate to the person. When an event occurs, the binaural sound switches or changes to stereo sound, to mono sound, or to altered binaural sound.

Abstract: An electronic device may comprise audio processing circuitry and a universal serial bus (USB) connector having a first contact and a second contact. In a first mode of operation, the audio processing circuitry is configured to output one or more audio signals carrying music and/or voice via the first contact and the second contact. In a second mode of operation, the audio processing circuitry is configured to output a signal for delivering supply current via the first contact and the second contact. While the electronic device is in the first mode of operation, a gain and/or volume limit of the audio processing circuitry may be set to a first level, and while the electronic device is in the second mode of operation, the gain and/or volume limit of the audio processing circuitry may be set to a second level that is higher than the first level.

Abstract: The invention discloses an earphone device comprising a first case, a first speaker unit, a first recording unit, and a second recording unit. The first speaker unit, disposed inside the first case, emits a first testing sound signal according to a test command. The first recording unit, disposed inside the first case, records a first environment sound signal according to a record command or a noise cancelling command. The second recording unit, disposed inside the first case, records a first feedback sound signal, related to the first testing sound signal, according to the test command.

Abstract: A device includes a memory and one or more processors coupled to the memory. The one or more processors are configured to perform an active noise cancellation (ANC) operation on noisy input speech as captured by a first microphone, the noisy input speech as captured by a second microphone, or both, to suppress a noise level associated with the noisy input speech. The one or more processors are configured to match a second frequency spectrum of a second signal with a first frequency spectrum of a first signal. The first signal is representative of the noisy input speech as captured by the first microphone, and the second signal is representative of the noisy input speech as captured by the second microphone. The one or more processors are also configured to generate an output speech signal that is representative of input speech based on the second signal.

Abstract: A noise cancelling headset includes an earpiece, the earpiece including a feedback microphone, a feed-forward microphone, and an output driver. A first feedback filter receives an input from at least the first feedback microphone and produces a first filtered feedback signal. A first feed-forward filter receives an input from at least the first feed-forward microphone and produces a first filtered feed-forward signal. A first summer combines the first filtered feedback signal and the first filtered feed-forward signal and produces a first output signal. An output interface provides the first output signal as an output from the headset.

Abstract: Embodiments of active noise control (ANC) headphones and operating methods thereof are disclosed herein. In one example, a headphone for ANC includes a speaker, an internal microphone, a processor, and a filter function module. The speaker is configured to play an audio based on a first audio source signal. The internal microphone is configured to obtain a mixed audio signal comprising a noise signal and a second audio source signal based on the audio of interest played by the speaker. The processor is configured to determine a current system parameter of the ANC headphone based on the mixed audio signal at a first time point and determine a current parameter of a filter function module based on the current system parameter of the ANC headphone and pre-tested data. The filter function module is to perform ANC based on the determined current parameter of the filter function module.

Abstract: In a method of operating a hearing device, an input transducer of the hearing device generates an input signal. A preliminary output signal is generated from this input signal through signal processing. An expected direct sound that is expected to be heard at one ear of a user of the hearing device is ascertained based on the input signal. A propagation delay of the preliminary output signal is ascertained with respect to the expected direct sound. A masking signal is generated based on the input signal and/or the preliminary output signal, taking into account the expected direct sound and/or the propagation delay of the preliminary output signal with respect to the expected direct sound. An output signal is generated based on the preliminary output signal and masking signal.

Abstract: An automatic noise control system and method for a helmet with a rigid shell that is configured to spatially divide a shell interior from a shell ambiance include generating in connection with at least one loudspeaker disposed in the shell interior anti-sound in the shell interior based on at least one input signal. The anti-sound is configured to attenuate sound occurring in the shell interior through destructive superposition. The system and method further include providing the at least one input signal by at least one of picking up sound in the vicinity of the loudspeaker in the shell interior, picking up vibrations of the shell, and picking up sound in the vicinity of the shell exterior.

Abstract: An audio playback device having a noise-cancelling mechanism is provided that includes an external sound-receiving circuit that receives external noise, a fixed-coefficient filtering circuit, an operation circuit, an audio playback circuit, an internal sound-receiving circuit and an adjusting circuit. The fixed-coefficient filtering circuit generates an inverted signal including a main and an auxiliary inverted components having the same amplitude and phases orthogonal to each other according to the external noise. The operation circuit multiplies the inverted signal by adjusting parameters to generate an adjusted inverted signal. The audio playback circuit receives and playbacks an audio signal and the adjusted inverted signal to generate a playback result. The internal sound-receiving circuit receives the playback result to generate a received sound signal.

Abstract: Described are systems and methods for facilitating communication between a user and other users, services, and so forth. A wearable device, such as a pair of glasses, may be worn and used in conjunction with another user device, such as a smartphone, to support communications between the user and others. Inputs such as motion of the head, orientation of the head, verbal input, and so forth may be used to initiate particular functions on the wearable device, the user device, or with a service. For example, a user may turn their head to the left and speak to send a message to a particular person. A display light in the field of view of the user may illuminate to a particular color that has been previously associated with the particular person. This provides visual feedback to the user about the recipient of the message.

Abstract: Occlusion devices, earpiece devices and methods of forming occlusion devices are provided. An occlusion device is configured to occlude an ear canal. The occlusion device includes an insertion element and at least one expandable element disposed on the insertion element. The expandable element is configured to receive a medium via the insertion element and is configured to expand, responsive to the medium, to contact the ear canal. Physical parameters of the occlusion device are selected to produce a predetermined sound attenuation characteristic over a frequency band, such that sound is attenuated more in a first frequency range of the frequency band than in a second frequency range of the frequency band.

Abstract: An in-ear microphone with active noise control is provided, including a housing, a speaker unit and a microphone module. The housing includes an air hole and a sound outlet. The speaker unit is disposed in the housing, and separates a space in the housing into a front chamber and a rear chamber. The microphone module is at least partially located in the front chamber and between the sound outlet and the speaker unit. The air hole is in communication with the sound outlet through the front chamber. The microphone module is configured to receive sound of a user and ambient sound.

Abstract: Various implementations include vehicle headrest configurations and related audio systems. In some particular implementations, a vehicle headrest includes: a main body having a front surface arranged to support a back of a head of a user and a pair of acoustic channels each formed in part by a side wall having a front edge that is offset from the front surface, the main body having a portion configured to receive first and second transducers having a center-to-center spacing of approximately 130 millimeters (mm) to approximately 240 mm, where a dimension (Dimension K) defined by a distance between respective inside surfaces of the side walls of the pair of acoustic channels is related to a dimension (Dimension F) defined by an amount that the front edge of each side wall is recessed from the front surface.

Abstract: A method for transmission path noise control using an audio headset and a sending device comprises generating microphone signals by a first and a second microphone of the headset based on detected sound including desired audio information and noise. An encoded signal is generated on a first line of a data cable by means of the headset by encoding input signals depending on the microphone signals. The method comprises transmitting the encoded signal from the headset to the sending device via the first, reconstructing the input signals by decoding the encoded signal by the sending device, generating by the sending device a clean signal by applying a first noise control algorithm to the reconstructed first and second input signal and sending a signal depending on the clean signal to a communication network.

Abstract: A head-worn audio system includes a first support frame; a first contact element coupled to the first support frame and configured to contact a first portion of a head of a user; a first actuator coupled to the first support frame and the first contact element; and a processor that is communicatively coupled to the first actuator and is configured to: generate a first actuator signal based on first information that is to be conveyed to the user; and transmit the first actuator signal to the first actuator, wherein the first actuator generates a first force on the first contact element based on the first actuator signal, the first force corresponding to the information to be conveyed to the user.

Abstract: In environments (such as acoustic and bioelectrical environments) characterized by multiple simultaneous sources, effective blind source separation from sensor response mixtures becomes difficult as the number of sources increases-especially when the true number of sources is both unknown and changing over time. However, in some environments, non-sensor information can provide useful hypotheses for some sources. Embodiments of the present invention provide an adaptive filtering architecture for validating such source hypotheses, extracting an estimated representation of source signals corresponding to valid hypotheses, and improving the separation of the remaining “hidden” source signals from the sensor response mixtures.

Abstract: A noise cancelling earphone includes an earphone housing, a filter module, and a speaker. The filter module and the speaker are installed in the earphone housing. The filter module includes a printed circuit board, a microphone, and a filter unit. The microphone and the filter unit are respectively disposed on the printed circuit board. The filter unit is electrically connected between the microphone and the speaker. The filter module is arranged in the earphone. The structural design is reasonable, the space is effectively utilized, the structure is compact, and the assembly is convenient.

Abstract: An active noise cancellation device having an acoustic filter includes: a casing, an active noise cancellation unit, a speaker, a noise cancellation processor and an acoustic filter. The casing includes a first channel and a second channel, wherein a channel length of the first channel is greater than a channel length of the second channel. The active noise cancellation unit includes an external microphone disposed outside the casing. The active noise cancellation is configured to detect an ambient noise, wherein a location of the external microphone corresponds to a location of the first external end of the first channel. The speaker is disposed at a second external end of the second channel, and is configured to output a phase-inverted signal of the ambient noise. The noise cancellation processor electrically couples with the external microphone and the speaker. The acoustic filter is disposed inside the first channel.

Abstract: According to an example embodiment, an apparatus for active cancellation of sound and vibration is provided, the apparatus including sound and vibration generation components for jointly producing vibration and sound under control of a driving signal provided as input thereto, the components being arranged inside a padding to generate mechanical vibration that is perceivable as a vibration and sound on at least one outer surface of the padding and to radiate a sound through the at least one outer surface of the padding, a feedback unit for providing feedback information that is indicative of acoustic energy of sound and vibration inside the padding, and a drivert for generating the driving signal in dependence of the feedback information so as to reduce energy of ambient sound and vibration induced inside the padding due to one or more external sources of sound and vibration.

Abstract: A method performed by a wearable audio output device worn by a user is provided for controlling external noise attenuated by wearable audio output device. A speech is detected from a user wearing the wearable audio output device, wherein the audio output device has active noise reduction turned on. It is determined, based on the detecting, that the user desires to speak to a subject in the vicinity of the user. In response to the determining, a level of noise reduction is reduced to enable the user to hear sounds external to the audio output device. It is determined that the user desires to speak to the subject by detecting at least one condition of a plurality of conditions.

Abstract: An active noise control (ANC) system uses a proportional integral (PI) controller to produce a control signal based on feedback that comprises a combination of ambient sound and antinoise. The ANC system generates a corrected control signal based on the control signal and a configurable filtering parameter, and produces the antinoise under control of the corrected control signal such that the antinoise destructively interferes with frequencies of the ambient sound to produce the feedback. The ANC system uses a microphone to receive the feedback and provide the feedback to the PI controller.

Abstract: A method for active noise reduction includes sensing one or more characteristics of a sound wave; calculating an inverted sound wave based on the one or more characteristics; and emitting the inverted sound wave by flowing a current, selected according to the inverted sound wave, through a wire under tension that passes through a positive pole of a magnet and a negative pole of the magnet, thereby causing the wire to vibrate.

Abstract: A sound output device includes: a first microphone configured to receive ambient sounds from around a user; a loudspeaker configured to output sounds toward an eardrum of the user; signal processing circuitry configured, in a case in which it is detected that an external terminal is in a playback state in which the external terminal provides a playback sound signal indicative of a playback sound, to generate a first reverse-phase signal based on a first signal derived from a sound received by the first microphone, and configured to impart predetermined frequency characteristics to the first signal in a case in which it is detected that the external terminal is in a stopped state that is not the playback state; and an adder configured to add together the playback sound signal and a signal output from the signal processing circuitry, to output a resultant signal for output by the loudspeaker.

Abstract: In general, in one aspect, a hearing aid has an ANR circuit and an ear tip that acoustically occludes the ear. Such a hearing aid provides greater gain to sounds than would be stable in the same hearing aid with a vented ear tip. The ear tip and the ANR circuit in combination attenuate sounds reaching the ear canal through the hearing aid to a first level. The hearing aid detects sounds arriving at a microphone, amplifies those sounds, and provides the amplified sounds to the ear canal at a second level and later in time than the same sounds arrive at the ear canal through the ear tip. The first level is at least 14 dB greater than the second level, such that the amplified sounds do not interact with the passive sounds to result in spectral combing.

Abstract: A request for transport services that identifies a rider, an origin, and a destination is received from a client device. Eligibility of the request to be serviced by a vertical take-off and landing (VTOL) aircraft is determined based on the origin and the destination. A transportation system determines a first and a second hub for a leg of the transport request serviced by the VTOL aircraft and calculates a set of candidate routes from the first hub to the second hub. A provisioned route is selected from among the set of candidate routes based on network and environmental parameters and objectives including pre-determined acceptable noise levels, weather, and the presence and planned routes of other VTOL aircrafts along each of the candidate routes.

Abstract: Methods and apparatus for a battery-less, noise-cancellation headset compatible with 4-pin audio jack are generally described herein. An example device to support a noise cancellation function may include an audio socket including a microphone contact, and an ambient noise detection module to receive an ambient noise data signal from a headset via the microphone contact, and detect an impedance at the microphone contact. The ambient noise detection module further to provide a first noise cancellation signal responsive to the impedance having a first value and to provide a second noise cancellation signal responsive to the impedance having a second value.

Abstract: A hearing protection headset that can be worn by a user includes left and right earcups. The headset includes a radio communication system enabling at least one radio signal to be received and played through one or both of the earcups. Noise control circuitry in the headset is configurable by a user between at least three active modes of operation—the circuitry having a first active mode in which the headset provides automatic noise reduction, a second active mode in which the headset provides automatic noise cancellation, and a third active mode in which the headset provides both automatic noise reduction and automatic noise cancellation. A switch is manually operable by the user to configure the circuitry between the first active mode and the second active mode and the third active mode.

Abstract: A pair of earphones have microphone arrays each including a front microphone and a rear microphone. A processor uses a first set of filters to combine the four microphone signals to generate a far-field signal that is more sensitive to sounds originating a short distance away from the earphones than to sounds close to the apparatus, and provides the far-field signal to the speakers for output. The processor also uses a second set of filters to combine the four microphone signals to generate a near-field signal that is more sensitive to voice signals from a person wearing the earphones than to sounds originating away from the earphones, and provides the near-field signal to a communication system.

Abstract: In some embodiments, a method, apparatus and computer program for reducing noise from an audio signal captured by a drone (e.g., canceling the noise signature of a drone from the audio signal) using a model of noise emitted by the drone's propulsion system set, where the propulsion system set includes one or more propulsion systems, each of the propulsion systems including an electric motor, and wherein the noise reduction is performed in response to voltage data indicative of instantaneous voltage supplied to each electric motor of the propulsion system set. In some other embodiments, a method, apparatus and computer program for generating a noise model by determining the noise signature of at least one drone based upon a database of noise signals corresponding to at least one propulsion system and canceling the noise signature of the drone in an audio signal based upon the noise model.

Abstract: Disclosures of the present invention describe a portable smart electronic device, which consists of several first reference microphones, a first loudspeaker, a first error microphone, several of second reference microphones, a second loudspeaker, a second error microphone, and a noise controlling module. Both the first error microphone and the second error microphone are set to have a noise detection direction and face to a first region near to a right ear and a second region near to a left ear, respectively. Therefore, the noise detection direction and an audio broadcasting direction of both the first loudspeaker and the second loudspeaker have a same progress direction. By such arrangement, this portable smart electronic device can be operated to adaptively provide an anti-noise audio to the first region and the second region for establishing a quiet zone in both the two regions by attenuating various environment noises.

Abstract: An earpiece includes a feed-forward microphone coupled to the environment outside the headphones, a feedback microphone coupled to an ear canal of a user when the earpiece is in use, a speaker coupled to the ear canal of the user when the earpiece is in use, a digital signal processor implementing feed-forward and feedback noise compensation filters between the respective microphones and the speaker, and a memory storing an ordered sequence of sets of filters for use by the digital signal processor. Each of the sets of filters includes a feed-forward filter that provides a different frequency-dependent amount of sound pass-through or cancellation, which in combination with residual ambient sound reaching the ear results in a total insertion gain at the ear of a user.

Abstract: Boomless-microphones are described for a wireless helmet communicator with siren signal detection and classification capabilities. An acoustic component receives an audio signal and comprises a left acoustic sensor and a right acoustic sensor. The left acoustic sensor is mountable or attachable to the surface of a left wall of a helmet and the right acoustic sensor is mountable or attachable to the surface of a right wall. A speaker component can generate an echoless audio signal via signal inversion of the audio signal, outputs to a left speaker mountable or attachable to a left ear area of the helmet and a right speaker mountable or attachable to a right ear area of the helmet. A signal enhancement component can increase an intensity of the first audio signal associated with an emergency siren based on a determined proximity of an emitting emergency vehicle or emergency object to the device.

Abstract: An audio system can include an analog portion having multiple input sensors and an output device, a first digital portion running at a first rate and having a first processor that is electrically coupled with the input sensors and the output device, and a second digital portion running at a second rate that is higher than the first rate and having a second processor that is electrically coupled with the first processor.

Abstract: A mobile terminal is provided. The mobile terminal includes a display screen on a terminal housing and a periscope optical zoom lens. The display screen and the periscope optical zoom lens are arranged in a non-overlapping manner in a thickness direction of the terminal, and the periscope optical zoom lens is located in a top area of the terminal. Additionally, the periscope optical zoom lens is configured to collect an image in an optical signal form by means of optical zoom, so that an optical-to-electrical conversion chip converts the image in an optical signal form into an image in a digital signal form and the display screen is configured to display the image in a digital signal form.

Abstract: In accordance with systems and methods of the present disclosure, a method may include receiving an error microphone signal indicative of an acoustic output of a transducer and ambient audio sounds at the acoustic output of the transducer. The method may also include generating an anti-noise signal to reduce the presence of the ambient audio sounds at the acoustic output of the transducer based at least on the error microphone signal. The method may further include generating an equalized source audio signal from a source audio signal by adapting, based at least on the error microphone signal, a response of the adaptive playback equalization system to minimize a difference between the source audio signal and the error microphone signal. The method may additionally include combining the anti-noise signal with the equalized source audio signal to generate an audio signal provided to the transducer.

Abstract: Example embodiments disclosed herein relate to user experience oriented audio signal processing. There is provided a method for user experience oriented audio signal processing. The method includes obtaining a first audio signal from an audio sensor of an electronic device; computing, based on the first audio signal, a compensation factor for an acoustic path from the electronic device to a listener and applying the compensation factor to a second audio signal outputted from the electronic device. Corresponding system and computer program products are disclosed.

Abstract: A person support apparatus, such as a bed, cot, stretcher, or the like, includes an active noise cancellation device configured to generate a noise cancelling sound wave that is designed to cancel a noise sound wave. The active noise cancellation device may include speakers and a microphone. In other embodiments, the person support apparatus includes a sound emitting component and a transmitter adapted to send out a notification signal prior to activation of the sound emitting component. The notification signal provides information about a characteristic of the sound to be emitted by the sound emitting device. The recipient of the notification signal may then use the signal to cancel the sound that is to be emitted. In some embodiments, the person support apparatus acts as a conduit for notification signals of upcoming sounds, receiving and forwarding such notification signals from and to other devices.

Abstract: A method and apparatus for controlling earphone noise reduction. The method for controlling earphone noise reduction can include collecting a noise signal of an environment where a terminal microphone is placed, processing the collected noise signal to generate a judgement result, and controlling connected earphones to enable a noise reduction function or disable the noise reduction function according to the judgement result. Embodiments of the present disclosure can be realized without a hardware switch for noise reduction adjustment on earphones. Embodiments of the present disclosure are capable of automatic noise reduction, thereby improving the integration degree of the earphones and also enhancing the noise reduction efficiency of the earphones.

Abstract: An earphone noise reduction method and apparatus, which are applicable to the technical field of wearable devices. The earphone noise reduction method can include collecting, using an earphone microphone, a noise signal of an environment where the earphone microphone is placed. The method can also include transmitting the noise signal to a connected terminal or transmitting a noise value corresponding to the noise signal to the connected terminal. The method can further include receiving a judgement result returned by the terminal, and enabling a noise reduction function or disabling the noise reduction function according to the judgement result. Embodiments of the present disclosure can be realized without keys or toggle switches for noise reduction adjustment on earphones. Embodiments of the present disclosure are capable of automatic noise reduction, thereby improving the integration degree of the earphones and also enhancing the battery life of the earphones.

Abstract: A pair of earphones have microphone arrays each including a front microphone and a rear microphone. A processor uses a first set of filters to combine the four microphone signals to generate a far-field signal that is more sensitive to sounds originating a short distance away from the earphones than to sounds close to the apparatus, and provides the far-field signal to the speakers for output. The processor also uses a second set of filters to combine the four microphone signals to generate a near-field signal that is more sensitive to voice signals from a person wearing the earphones than to sounds originating away from the earphones, and provides the near-field signal to a communication system.

Abstract: Disclosed is a seat intended in particular for a passenger transport vehicle, the seat including a seating part, a backrest that pivots relative to the seating part, a headrest, and an active noise control device including: at least one error sensor capable of sensing a minimization acoustic field and generating a reference signal; a reference sensor able to capture an undesirable acoustic field; a processing unit able to generate a cancellation signal from the reference signal and from a signal representative of the undesirable acoustic field; and at least one speaker able to emit a cancellation acoustic field from the cancellation signal. The headrest includes a support and a first deformable casing carried by the support. The at least one error sensor is arranged on the first deformable casing.

Abstract: A headphone detector including a headphone and a processor. The headphone has a microphone and a speaker, and the microphone is configured to generate an audio signal based on an output of the speaker. The processor is configured to receive the audio signal, determine a characteristic of the audio signal, and assess whether the headphone is on ear or off ear based on a comparison of the characteristic to a threshold. The threshold corresponds to one or more of an audio response of the audio signal at a corresponding frequency and an audio response of a feedback microphone signal at a corresponding frequency, under one or more known conditions.

Abstract: An active noise reduction earphone includes structure for positioning and retaining the earphone in the ear of a user and, active noise reduction circuitry including an acoustic driver with a nominal diameter greater than 10 mm oriented so that a line parallel to, or coincident with, an axis of the acoustic driver and that intersects a centerline of the nozzle intersects the centerline of the nozzle at angle ?>±30 degrees. A microphone is positioned adjacent an edge of the acoustic driver. The earphone is configured so that a portion of the acoustic driver is within the concha and another portion of the acoustic driver is outside the concha.