A method to suppress noise emanating from an electrical power generator including the steps of: receiving sound emanating from the electrical power generator, wherein the sound is received in a duct for cooling air having passed through the generator; analyzing the received sound and, based on the analysis, generating a sound signal which represents a destructive sound to the received sound, and broadcasting a destructive sound into the duct, wherein the destructive sound corresponds to the sound signal.

A quiet toilet apparatus disclosed. Microphones and circuitry are used to receive and detect one or more virtual point source locations and propagation directions of unwanted toilet noise. Speakers are used to create one or more synthesized wave fronts resulting in cancelation and reduction of unwanted toilet noise. The speakers, microphones and circuitry may be located within a toilet seat of a toilet or at a remote location. A user device or remote device may be connected to the noise reduction toilet apparatus for data recording, collection, reporting, and electronic noise filtering.

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.

In a signal processing device, a signal processing method, a recording medium, and a rangehood apparatus, a filter coefficient is set in a sound cancelling filter, and the sound cancelling filter outputs a cancellation signal. A coefficient calculator calculates a first filter coefficient. An oscillation suppressor calculates a second filter coefficient by applying a window function to the first filter coefficient to set the second filter coefficient as the filter coefficient.

A silencer is to be used in combination with a range hood system to suppress noise made by a fan. In a silencing circuit, a disturbance detector detects mixing of disturbance sound to a correction signal and an error signal. When the disturbance detector detects the mixing of the disturbance sound, an updating stopper causes a coefficient updater to stop a processing of updating a filter coefficient of a silencer filter, relating to, as an object, at least a frequency band other than a frequency band of the noise.

Sufficient sound pressure is obtained in the mid-low range, to provide a SoT module 100 which can be applied to a variety of applications. A SoT module 100 comprises a plate-shaped piezoelectric composite 105 for generating bending vibration by the impression of an AC voltage, a plurality of elastic bodies, one ends of which are bonded to the main surface of the piezoelectric composite 105, the elastic bodies 120a and 120b transmitting vibration of the piezoelectric composite 105 and a vibration plate 130 has a main surface which is bonded to the other ends of the elastic bodies 120a and 120b, wherein the piezoelectric composite 105 comprises piezoelectric elements 110a 110b formed in a rectangular plate, and there is a position of the centroid of the piezoelectric composite 105 between the plurality of elastic bodies 120a and 120b.

An image capture device detects a wind whistle using two or more microphones. The image capture device includes a processor that obtains microphone signals from the two or more microphones and determines coherence values between the microphone signals across a frequency band. The processor determines a coherence value for each frequency bin of the frequency band. Based on a detection of an elevated coherence value in a frequency bin, the processor determines the presence of a whistle. The processor attenuates the frequency bin based on a determination that the elevated coherence value is above a threshold.

A vacuum cleaner comprises a suction motor, a suction fan which is to be driven by the suction motor to generate airflow, and a main body housing which accommodates the suction motor and the suction fan. The vacuum cleaner comprises a silencer having one end coupled to the main body housing to reduce noise inside the main body housing during an operation of the intake motor. The silencer includes a contact surface disposed in the one end of the silencer to face the suction fan so as to contact the airflow, and includes a silencer chamber partitioned from the interior of the main body housing by means of the contact surface. The silencer includes a plurality of through-holes arranged in the contact surface to have the noise chamber to be in communication with an inside of the main body housing through the plurality of through holes.

An active noise cancellation system for a toilet comprising a lid configured to cover a bowl of the toilet, a microphone configured to detect noises associated with the toilet, and a coil coupled to the lid and configured to causes vibrations in the lid to emit sounds derived from the detected noises associated with the toilet.

A method of operating an audio system of a domestic appliance may include directing operation of the audio system. The method may include determining noise produced during operation of appliance components. The method may include implementing a responsive action at the audio system to adjust acoustic parameters of the audio system in response to determining noise produced during operation of appliance components.