An active noise control device includes a first adaptive filter configured to generate a control signal by performing a filtering process on a reference signal corresponding to noise, and a first filter coefficient updating unit configured to update a filter coefficient of the first adaptive filter based on based on the reference signal and an added error signal acquired by adding a first error signal acquired by detecting residual noise by a first microphone and a second error signal acquired by detecting residual noise by a second microphone.

An audio enhanced hearing protection system to be worn by a user includes an ambient noise reduction assembly having a primary noise reduction unit and a secondary noise reduction unit. The audio enhanced hearing protection system also includes an audio input assembly having one or more environmental microphones to receive raw environmental audio signals. The raw audio signals are transformed into processed audio signals via a digital signal processing assembly prior to transmission to a user. The audio enhanced hearing protection system also includes an audio output assembly having at least one speaker to transmit processed audio signals to a user.

Provided is an information processor including a signal processing section that acquires a first signal to be detected by an acoustic input section of a first unit including the acoustic input section disposed within a predetermined distance from one ear hole of a user in a state of being worn by the user, acquires a second signal, which indicates a noise generated from a noise source, to be acquired by a second unit, and generates a noise cancellation signal directed to the noise on the basis of the first signal and the second signal.

The present technology relates to signal processing device and method, and a program for enabling spatial noise cancelling with a saved space and a small computation amount. The signal processing device includes a control section that, on the basis of a first microphone signal obtained by sound collection at a first microphone array, a speaker drive signal of an output sound for cancelling a sound which is propagated from an outside of a predetermined region to the predetermined region and is collected by the first microphone array, and that outputs the output sound from a speaker array on the basis of the speaker drive signal. The first microphone array includes a plurality of microphones. The speaker array includes at least one high-order speaker. The present technology is applicable to a signal processing device.

A noise-canceling headrest for a vehicle seat, comprising a central part and two side parts, at least one loudspeaker, a microphone, an audio source playback module capable of transmitting an audio signal to the loudspeaker, a noise sensor, and a signal processing circuit configured for: receiving a noise signal and determining a noise correction function, receiving an error signal from the microphone, and updating the noise correction function, generating a noise correction signal by applying the noise correction function to the noise signal, generating a control signal intended for the loudspeaker, by adding together the noise correction signal and the audio signal.

An audio processing system includes: a first microphone configured to output a first signal based on a first audio signal; one or more microphones each of which outputs a microphone signal based on an audio signal; one or more adaptive filters configured to respectively receive the microphone signals from the one or more microphones and output passing signals based on the microphone signals; and a processor configured to: determine whether the microphone signal includes uncorrelated noise; control one or more filter coefficients of the one or more adaptive filters; and subtract a subtraction signal based on the passing signals from the first signal. The one or more microphones include a second microphone that outputs a second signal. When determining that the second signal includes the uncorrelated noise, the processor is configured to set a level of the second signal input to the corresponding adaptive filter to zero.

A noise canceling adaptive filter outputs, from a front seat speaker, a noise canceling sound generated by applying a transfer function X(z) adapted by an adaptive operation using an output of a front seat microphone as an error to an output sound of a sound source apparatus. An output of the front seat microphone is added to an output of an audio feedback canceling filter by a second adder, added to an output sound of the sound source apparatus by a third adder, and output from a rear seat speaker. The audio feedback canceling filter applies a transfer function X′(z) and a transfer function C^(z) on an output of the second adder and outputs a resultant. The transfer function C^(z) corresponds to a transfer function C(z) from the front seat speaker to the front seat microphone. In synchronization control, the transfer function X(z) is set as the transfer function X′(z).

System for automatic right-left ear detection for headphone comprising: first earcup and second earcup that are identical. Each of first and second earcups includes: first microphone located on perimeter of each earcup, when first earcup is worn on user's right ear first microphone of first earcup is at location farthest from user's mouth when headphone is worn in normal wear position; second microphone located on perimeter of each earcup, when first earcup is worn on user's right ear, second microphone of first earcup is at location closer than first microphone of first earcup to user's mouth; third microphone located inside each earcup facing user's ear cavity, fourth microphone located at perimeter and bottom center portion of each earcup and facing exterior of each earcup, and fifth microphone located on perimeter of each earcup above and to left of second microphone when looking at outside housing of each earcup.

An unmanned aircraft includes: rotor blades; a duct that shrouds the rotor blades and through which airflow generated by rotation of the rotor blades passes; and a processor that controls rotation of the rotor blades. The height to width ratio of an inner space of the duct in which the rotor blades are shrouded is at least 0.5.

A fan blade assembly having integrated microphones to measure acoustic energy levels uses speakers controlled by a control unit to output anti-acoustic energy vibrations. Specific embodiments wherein the speakers and microphones are radially displaced around the fan blade assembly are also disclosed.