A consumer appliance is provided herein. The consumer appliance may include a cabinet, an exterior panel, an electromechanical driver, an electromechanical receiver, and a controller. The cabinet may define an internal chamber. The exterior panel may be mounted to the cabinet. The electromechanical driver may be fixed to the exterior panel to generate a soundwave therefrom. The electromechanical receiver may be mounted within the cabinet. The controller may be configured to initiate a noise canceling operation. The noise canceling operation may include receiving a noise input signal at the electromechanical receiver and initiating an anti-noise wave at the electromechanical driver through the exterior panel based on the received noise input signal.

A fan control system applied to N fans inside a computer system is disclosed, comprising: a main microphone, a control circuitry, a wave generation circuitry and a number N of fan controllers. The control circuitry calculates a basic frequency value according to a temperature inside the computer system, and continuously updates a parameter by any known optimization algorithm according to a main audio signal from the main microphone. The wave generation circuitry generates N square waves according to the basic frequency value and the parameter. The N fan controllers respectively form and transmit N modulation signals to the N fans according to the N square waves and N tachometric signals from the N fans. The parameter is one of a frequency variation and a set of phase differences, and the N square waves have the same frequency.

According to one embodiment, a noise reduction apparatus includes a speaker, a generator and a controller. The speaker outputs control sound. The generator generates self-excited sound. The controller controls a phase and an amplitude of the control sound to reduce noise generated from a noise source, based on the control sound and the self-excited sound that is synchronized with the control sound.

A scent neutralizing unit includes a housing, an odor neutralizing gas emitter, and an active noise canceling system. The odor neutralizing gas emitter is coupled to the housing and is configured to provide an odor neutralizing gas that neutralizes odor particles. The active noise canceling system includes a microphone configured to generate a captured signal representing a noise signal, an acoustic transducer configured to emit audio signals, and a controller operatively coupled to the microphone and the acoustic transducer and configured to receive the captured signal from the microphone. The controller is configured to control the acoustic transducer to emit an anti-noise signal based on the captured signal where the anti-noise signal is configured to attenuate the noise signal.

Active noise cancellation is employed to address unwanted acoustical noise generated by various equipment associated with an ophthalmic surgical system. Active noise cancellation may be used within a chassis of the ophthalmic surgical system, within an air compressor used with the ophthalmic surgical system, and within a reciprocating surgical probe used with the ophthalmic surgical system.

An electronics for active cancellation of a pulsating flow with a source noise reference. The electronics includes a signal processor configured to receive a noise source signal and a flow signal. The signal processor is also configured to generate a cancelling signal based on the noise source signal and the flow signal. A controller is communicatively coupled to the signal processor, and configured to determine a flow rate control signal for controlling the flow rate of the pulsating flow. A signal generator coupled to the signal processor and the controller is configured to receive the flow rate control signal, generate a valve signal based on the flow rate control signal and the cancelling signal, and provide the valve signal to a valve to control the flow rate and attenuate the one or more pulses of the pulsating flow.

According to one embodiment, a noise reduction apparatus includes a speaker, a generator and a controller. The speaker outputs control sound. The generator generates self-excited sound. The controller controls a phase and an amplitude of the control sound to reduce noise generated from a noise source, based on the control sound and the self-excited sound that is synchronized with the control sound.

A method and system for noise cancellation is disclosed. In one embodiment, the method may include receiving, from a first sensor, a first signal indicative of a noise generated by an equipment. The first sensor may be configured to generate the first signal indicative of the noise generated by the equipment. The first sensor may be positioned in proximity to the equipment. The method may further include generating a noise cancellation signal based on the first signal and triggering a speaker to generate a sound corresponding to the noise cancellation signal, wherein the speaker is positioned in proximity to the equipment.

Apparatuses and methods for improved noise reduction and voice capture in respiratory protective devices are provided. For example, an example respiratory protective device includes at least one fan component secured to the respiratory protective device, at least one sound sensor component positioned within the respiratory protective device and generating a detected sound signal, and a controller component electronically coupled to the at least one fan component. In some examples, the controller component is configured to receive a detected fan speed signal, retrieve a corresponding noise profile data object, generate a noise-reduced sound signal, and transmit the noise-reduced sound signal to a data communication component.

The present invention; It is about the method developed to reduce noise in machines such as compressors that compress air and gases to higher pressures, and compressors and generators that emit high noise, such as generators that convert mechanical energy into electrical energy, using the active sound suppression method, and the device designed by positioning according to this method. The system developed with the present invention is a noise reduction method in high-noise machines and includes ANC integrated (200), microphone (100), loudspeaker (400), and is mainly used in machines such as generators and compressors.