An active noise canceling apparatus using a motor may include a reference sensor configured for detecting a noise source of the vehicle; an error sensor configured for detecting information related to internal noise of the vehicle; an adaptive control circuit configured of adjusting a filter value for reducing the internal noise of the vehicle on the basis of detecting signals from the reference sensor and the error sensor, and generating a current instruction for driving the motor by applying the adjusted filter value; a motor controller configured for controlling driving of the motor to follow the current instruction; and a radiation sound generator engaged to the motor and generating sound for offsetting the internal sound using vibration generated according to the driving of the motor.

A noise suppressor includes a memory; and a processor coupled to the memory, the processor is configured to: acquire a noise signal in a vicinity of a head region of an occupant seated in a vehicle seat; generate a control sound having an opposite phase to the acquired noise signal; acquire a sound signal having a predetermined frequency that is different from the noise signal; and output, as an output sound signal, the acquired sound signal in combination with the generated control sound.

A vehicle includes a cabin, an internal-loudspeaker set an external-microphone set, and a signal processor that filters a raw audio signal that has been received by the external-microphone set broadcasts the resulting filtered audio signal into the cabin using the internal-loudspeaker set.

A active noise cancellation (ANC) system may include an adaptive filter divergence detector for detecting divergence of the one or more controllable filters as they adapt, based on various temporal or frequency domain amplitude characteristics. Upon detection of a controllable filter divergence, the ANC system may be deactivated, or certain speakers may be muted. Alternatively, the ANC system may modify the diverged controllable filters to restore proper operation of the noise cancelling system. This may include adjusting a leakage value of an adaptive filter controller.

A system for vehicle exterior noise reduction, comprising: means for measuring amplitude and phase of exterior noise, which 5 propagates at least in part in a first direction from at least one exterior noise source of a vehicle, having an acoustic transmission path, wherein the exterior noise propagates at least in part under an underbody of the vehicle; means for calculating an out of phase signal based at least in part on the measured amplitude and phase of the exterior noise; and 10 means for generating an out of phase sound, based at least in part on the calculated out of phase signal, configured to cancel exterior noise; wherein the generated out of wave sound propagates at least in part in the first direction of the acoustic transmission path.

An earmuffs system for noise reduction including an external microphone used in combination with active noise cancellation technology for the reduction of wind or other noises typically experienced while riding a vehicle such as a motorcycle, snow machine or ATV, the earmuffs system including a first earmuff including a first speaker and a first microphone therein; a second earmuff electrically coupled to the first ear muff, the second ear muff including a second speaker and a second microphone therein; noise cancellation circuitry for receiving first sounds from the first microphone and the second microphone and processing the first sounds by in part canceling the first sounds to form a first sound output that is provided from the first speaker and the second speaker; a third microphone placed external to the first earmuff, the third microphone supplying second sounds for the first speaker to output as a second sound output without the second sounds undergoing noise cancellation processing; and a fourth microphone placed external to the second earmuff, the fourth microphone supplying third sounds for the second speaker to output as a third sound output without the third sounds undergoing noise cancellation processing.

A car charging device includes a main body, a charging interface, an input terminal, a conversion circuit, a microphone, a loudspeaker, and a noise reduction circuit. A main body includes an insertion portion and the top. The charging interface includes a charging terminal. The input terminal is located at the insertion portion. The conversion circuit is electrically connected to the input terminal and the charging terminal and configured to convert electric power. The microphone is located on the top and configured to convert a sound into an input audio. The loudspeaker is located on the top. The noise reduction circuit is configured to generate a noise reduction audio according to the input audio, and drive, by using the noise reduction audio, the loudspeaker to emit a noise reduction sound, where the noise reduction audio is an inversion of a regular audio continuing for a preset time in the input audio.

A noise-cancellation system, including: a plurality of sensors, each sensor outputting a sensor signal; a controller configured to receive each sensor signal, and, for each sensor signal, to: determine a power of the sensor signal at a plurality of frequencies; determine a measure of association between the power of the sensor signal at the plurality of frequencies and frequency; and determine whether the measure of association exceeds a predetermined threshold, wherein the processor is further configured to compute a noise-cancellation signal using the sensor signals, wherein the noise-cancellation signal is computed excluding sensor signals that were determined to exceed the predetermined threshold; and at least one actuator receiving the noise-cancellation signal and producing a noise-cancellation audio signal.

A sound signal control device in a device including an input transducer to detect sound in a space in a vehicle, a sensor to image an occupant in the space, and an output transducer to emit sound into the space includes: a controller to generate information indicating a position of a head of the occupant and information indicating a state of the occupant, based on an image imaged by the sensor; a processor to generate a cancellation signal for cancelling noise at the position based on a sound signal representing sound detected by the input transducer and the information, and generate a control signal for controlling sound at the position based on the cancellation signal; and a converter to cause the output transducer to emit a sound corresponding to the control signal. The processor adjusts a degree to which the noise is cancelled, based on the information indicating the state.

An audio system including an accelerometer positioned to produce an accelerometer signal representative of road noise within a vehicle cabin; a microphone operably positioned within the vehicle to receive the road noise and to produce a microphone signal having a road-noise component; and a cabin road-noise canceler, comprising a cabin road-noise cancellation filter, configured to receive the accelerometer signal and to produce a cabin road-noise cancellation signal, wherein the cabin road-noise cancellation signal is provided to an acoustic transducer for transduction of an acoustic road-noise cancellation signal, the acoustic road-noise cancellation signal minimizing the road noise within at least one cancellation zone in the vehicle cabin; a microphone road-noise canceler, comprising a microphone road-noise cancellation filter, configured to receive the cabin road-noise signal and the microphone signal and to minimize the road-noise component of the microphone signal according to the cabin road-noise cancellation signal, to produce an estimated microphone signal.