An integrated circuit for implementing at least a portion of a personal audio device may include an output for providing an output signal to a transducer, wherein the output signal includes a pilot signal, a microphone input for receiving a microphone signal from a microphone indicative of an output of the transducer, and a processing circuit. The processing circuit may be configured to implement a pilot signal control to apply an adjustment to the pilot signal as necessary to maintain the pilot signal at a substantially constant magnitude regardless of proximity of the transducer to a pinna and implement a proximity determination block configured to determine proximity of the transducer to the pinna based on the adjustment.

A sound state estimating unit detects surrounding sound at a timing at which a notification to a destination user occurs. A user state estimating unit detects a position of the destination user and positions of users other than the destination user at the timing at which the notification occurs. An output control unit controls output of the notification to the destination user at a timing at which it is determined that the surrounding sound detected by the sound state estimating unit is masking possible sound which can be used for masking in a case where the position of the destination user detected by the user state estimating unit is within a predetermined area.

Disclosed herein is an audio lighting device, which includes a wireless module, an audio source control circuit, a light source control circuit, a speaker, and a light source board. The wireless module receives a wireless signal and outputs an audio source control signal. The audio source control circuit receives the audio source control signal and outputs a first analog signal. The light source control circuit receives the audio source control signal and outputs a second analog signal. The speaker receives the first analog signal and outputs audio signal. The light source board receives the second analog signal to control the brightness of the outputted light, in which the brightness of the outputted light is proportional to the volume of the outputted audio signal.

A method for eliminating sound leakage includes: controlling, upon detecting call voice being outputted by a receiver, a collection device to determine a first frequency response curve of first sound wave of the call voice at a first position outside a terminal device; controlling a speaker to generate a second sound wave; controlling the collection device to determine a second frequency response curve of the second sound wave at the first position; and regulating, according to the first frequency response curve, the second frequency response curve to a third frequency response curve. Frequency responses of the first and third frequency response curves at a corresponding frequency are superimposed on and cancel each other. The speaker actively generates second sound wave that is modulated according to a parameter of first sound wave, so as to ensure that second sound wave effectively eliminates leakage of call content caused by first sound wave.

For online audio/video conferencing applications deployed in an open office environment, using shared conference devices, it can be advantageous to define an acoustic fence. A non-participant audio received from outside the acoustic fence can be considered noise and filtered out before transmission of an audio signal to a far end recipient. Three suppression stages are used to filter the non-participant audio. The first suppression stage uses beamformers for suppression. The second suppression stage is mask-based, and the third suppression stage is reference-based. The three suppression stages filter out non-participant audio signals, having a wide range of frequencies.

The application describes techniques for howling detection. A processing module for a noise control circuit is described. The processing module comprises a howling detector configured to receive an input signal and to determine a log-linearity metric based on the input signal. Gain adjustment of the noise control unit following the detection of howling is also described, wherein the amount of gain adjustment may be based on an estimation of the maximum stable gain of the noise control unit.

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.

An electronic device is provided. The electronic device includes a microphone. The electronic device includes a speaker. The electronic device includes a communication circuit. The electronic device includes at least one processor. The at least one processor is configured to obtain a second signal based on decoding a first signal received through the communication circuit from an external electronic device. The at least one processor is configured to output a third signal through the speaker obtained based on executing decompression the second signal. The at least one processor is configured to compensate the second signal based on a difference between the second signal and the third signal representing a distortion of the third signal, in response to obtaining an input signal including the output third signal through the microphone. The at least one processor is configured to execute cancellation of an echo of the input signal based on the compensated second signal.

A personal audio device, such as a wireless telephone, includes noise canceling circuit that adaptively generates an anti-noise signal from a reference microphone signal and injects the anti-noise signal into the speaker or other transducer output to cause cancellation of ambient audio sounds. An error microphone may also be provided proximate the speaker to estimate an electro-acoustical path from the noise canceling circuit through the transducer. A processing circuit uses the reference and/or error microphone, optionally along with a microphone provided for capturing near-end speech, to determine whether one of the reference or error microphones is obstructed by comparing their received signal content and takes action to avoid generation of erroneous anti-noise.

A method of selectively preventing surreptitious listening by a smart speaker by placing an audible interference device into physical proximity with the microphone(s) on the smart speaker, and whenever ensured privacy is desired toggling a feature on the audible interference device from a listening mode, wherein the device allows the microphone to receive and the smart speaker to interact with intelligible speech from the surrounding environment, and a deaf mode wherein the device inhibits reception of intelligible speech by the microphone and thereby prevents both desired and surreptitious listening by the smart speaker.