The invention involves the employment of a non-acoustical transducer embodying one non-acoustical sensor (or more non-acoustical sensors) which is adapted to sense acoustical sounds. The invention for realizing an Active Noise Cancellation device involves the replacement of the acoustic microphone (or microphones) in the said device with the aforesaid one non-acoustical sensor (or more sensors).

An active noise cancellation system (1) for cancelling environment noise perceived by a driver or passenger seated in a seat (3) mounted in a cabin of a vehicle, in combination with said seat, the seat comprising a seat cushion (19), a seat back (21) coupled to the seat cushion at a bottom end and extending upwards to a seat shoulder (23), and a headrest (22) coupled to the seat back, extending upwardly from the seat shoulder, the active noise cancellation system comprising an active noise cancellation circuit (ANC) (30), a plurality of microphones (10) mounted in the headrest and connected electrically to the ANC, and a plurality of speakers (16) mounted in the seat and connected electrically to the ANC circuit. The plurality of microphones comprises at least one first microphone mounted on a right side of the headrest and at least one second microphone mounted on a left side of the headrest, and the plurality of speakers comprises at least one first speaker mounted in the seat shoulder on a left side and at least one second speaker mounted in the seat shoulder on a right side, the right speaker configured to generate a noise cancellation sound from a noise signal picked up by the right microphone processed by the ANC circuit and the left speaker configured to generate a noise cancellation sound from a noise signal picked up by the left microphone processed by the ANC circuit.

A headset apparatus configured to be worn by a user operating outdoor power equipment. The headset may include a noise cancelling system and/or enhanced glasses.

An audio system for an ear mountable playback device comprises a speaker, an error microphone predominantly sensing sound being output from the speaker and a feed-forward microphone predominantly sensing ambient sound. The audio system further comprises a voice activity detector which is configured to record a feed-forward signal from the feed-forward microphone. Furthermore, an error signal is recorded from the error microphone. A detection parameter is determined as a function of the feed-forward signal and the error signal. The detection parameter is monitored and a voice activity state is set depending on the detection parameter.

Disclosed are an active noise reduction acoustic unit and a sound-producing unit, the active noise reduction acoustic unit includes a casing; a baseplate which is arranged in the casing and separates the casing into a first accommodating cavity and a second accommodating cavity; the first accommodating cavity and the second accommodating cavity are in communication with each other, the second accommodating cavity being provided therein with a feedback microphone, and the feedback microphone being configured to pick up noise signals; and the first accommodating cavity is provided therein with a moving iron speaker which can vibrate and produce sound according to the noise signals.

A system includes a microphone unit coupled to a roof of an autonomous vehicle. The microphone unit includes a microphone board having a first opening. The microphone unit also includes a first microphone positioned over the first opening and coupled to the microphone board. The microphone unit further includes an accelerometer. The system also includes a processor coupled to the microphone unit.

Computer-implemented methods, computer program products, and computer systems configured for receiving first audio data from a first computing device via a first microphone, receiving second audio data from a second computing device via a second microphone, detecting a first user utterance having a first user utterance local decibel measure in the first audio data and a first user utterance remote decibel measure in the second audio data, detecting a second user utterance having a second user utterance local decibel measure in the second audio data and a second user utterance remote decibel measure in the first audio data, determining a first cancelling coefficient based on the second user utterance detected at the first microphone and the second user utterance detected at the second microphone, applying the first cancelling coefficient to the first audio data, and generating first output audio data comprising the first user utterance at the first computing device.

Provided is an acoustic reproduction apparatus, including a first microphone to be used for noise cancellation processing using a feedback scheme, a second microphone including a sound collection surface in a direction different from a direction of a sound collection surface of the first microphone and to be used for noise cancellation processing using the feedback scheme, and an acoustic signal processing unit configured to generate a noise-cancelling signal using a first sound collection signal collected by the first microphone and a second sound collection signal collected by the second microphone.

An electronic system includes a fan module, an embedded controller, a reference microphone, an error microphone, an active noise cancellation controller, and a micro speaker module. The reference microphone is configured to output a wide-band noise signal associated with the operation of the fan module. The error microphone is configured to output an error signal by detecting the noise level during the operation of the electronic system. According to the wide-band noise signal, the error signal and the fan information provided by the embedded controller, the active noise cancellation controller calculates the narrow-band noises and the wide-band noises generated by the fan module, and drives the micro speaker module accordingly for providing a noise cancellation signal. The error signal may be reduced to zero by adaptively adjusting the noise cancellation signal for canceling the noises generated during the operation of the electronic system.

To promote further improvement in usability. A signal processing apparatus (10) includes an acquisition unit (111) that acquires an acoustic characteristic in a user's ear, isolated from the outside world, an NC filter unit (1122) that generates sound data having a phase opposite to an ambient sound leaking into the user's ear, a correction unit (1123) that corrects the sound data by using a correction filter, an a determination unit (1121) that determines a filter coefficient of the correction filter based on the acoustic characteristic.