An input signal representative of an undesired acoustic noise in a region is captured by one or more first sensors and processed to generate a cancellation signal. An output signal is generated based on the cancelation signal to cause one or more acoustic transducers to cancel, at least in part, the undesired acoustic noise in the region. A feedback signal representative of residual acoustic noise in the region is captured by one or more second sensors. A characteristic of each of the feedback signal, the cancellation signal, and a combination of the cancellation signal and the feedback signal is determined. One or more thresholds are compared to a ratio of (i) the characteristic of the combination of the cancellation signal and the feedback signal and (ii) a combination of the characteristic of the feedback signal and the characteristic of the cancellation signal to determine a convergence state.

The present disclosure relates to a method for masking a first noise which is generated by a part of a motor vehicle under a certain triggering condition, wherein, to mask the first noise, at least one second noise is superimposed on the first noise, and wherein the first noise is generated by closing at least one main contactor assigned to a battery of the motor vehicle.

A method for eliminating noises collected by an electronic device when voice recordings are being taken detects whether the electronic device is in a voice recording mode. A first acquiring device is controlled to acquire the speaking voices of at least one user, when determining that the electronic device is in the voice recording mode. A determination is made as to whether the speaking voices of at least one user acquired by the first acquiring device include noises produced by the vibration device, and eliminating noises produced by the vibration device, when the speaking voices of at least one user acquired by the first acquiring device include the noises produced by the vibration device.

In some examples, an audio output device can provide audio setting modification based on presence detection by receiving an input from a camera in response to the camera detecting the presence of a person, and modify an audio setting of the audio output device in response to receiving the input from the camera.

A control system and method of selectively enabling an auto-shutoff feature of a control system for an aviation headset includes a power switch. The power switch is toggled and if the control system is in a powered down state, a startup sequence for the control system is initiated. During the startup sequence, a bias voltage detector checks for a bias voltage on a signal line of the headset. If a bias voltage is detected during the startup sequence, the auto-shutoff feature is enabled. The auto-shutoff feature periodically checks for a bias voltage and powers down the control system if no bias voltage is detected for a predetermined time interval. If no bias voltage is detected during startup, the auto-shutoff feature is disabled.

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.

Technology described in this document can be embodied in an active noise reduction (ANR) headset earpiece that includes a first microphone disposed on the ANR headset earpiece such that the first microphone is configured to capture a first input signal representing noise traversing a first noise pathway through the ANR headset earpiece, and a second microphone disposed on the ANR headset earpiece such that the second microphone is configured to capture a second input signal representing noise traversing a second noise pathway through the ANR headset earpiece. Positions of the first microphone and the second microphone on the ANR headset earpiece are configured such that a first target level of coherence is achieved at multiple frequencies, the first target level of coherence at a particular frequency representing a fraction of an output signal that can be suppressed using the first input signal and the second input signal together.

Embodiments of systems and methods are described for reducing undesired leakage energy produced by a non-front-facing speaker in a multi-speaker system. For example, the multi-speaker system can include an array of forward-facing speakers, one or more upward-facing speakers, and/or one or more side-facing speakers. Filters coupled to any two of the speakers in the multi-speaker system can generate audio signals output by the coupled speakers to reduce, attenuate, or cancel a portion of an audio signal output by one or more non-front-facing speakers that acoustically propagates along a direct path from the respective non-front-facing speaker to a listening position in a listening area in front of the multi-speaker system.

A quantizer and a method for a sigma-delta modulator circuit that may be used as a component within an adaptive-noise cancelling headphone are presented. An apparatus includes a quantizer to receive an input signal with successive input values and quantizes the input signal at discrete intervals. This is done by mapping the input value of the input signal at each interval to one of a plurality of quantization levels with three or more quantization levels that are non-uniformly spaced. The plurality of quantization levels has a first portion with two or more quantization levels having the same sign and being proportional to a first fraction having one as its numerator and two to a power of a first variable as its denominator, the first variable being an integer and having a different value for each of the two or more quantization levels of the first portion.

A sound input/output device for a vehicle includes: microphones that are provided within a vehicle cabin; a plurality of directional speakers that are provided within the vehicle cabin, and that output sound to respective seats; an output position specifying section that specifies a seat that is an output destination from a voice collected by one or more of the microphones or from input from an utterer of a voice; and an output control section that outputs sound from one or more of the speakers to a seat specified by the output position specifying section.