A method for active noise reduction includes sensing one or more characteristics of a sound wave; calculating an inverted sound wave based on the one or more characteristics; and emitting the inverted sound wave by flowing a current, selected according to the inverted sound wave, through a wire under tension that passes through a positive pole of a magnet and a negative pole of the magnet, thereby causing the wire to vibrate. An apparatus for active noise reduction includes a microphone configured to detect one or more characteristics of a sound wave detected in a predetermined vicinity of the microphone; a processor coupled to the microphone, configured to calculate an inverted sound wave based on the one or more characteristics; a power supply; and at least one emitter module coupled to the processor, each emitter module including one or more magnets with a positive pole and a negative pole, a wire, made of a conductive material, under tension, that passes between the positive pole and the negative pole, and the power supply configured to deliver a current passing through the wire, the current selected by the processor to vibrate the wire and thereby emit the inverted sound wave.

A method and apparatus of acoustic processing for a mobile device having a haptic actuator is described. A vibration drive signal for driving a haptic actuator is received. A vibration noise output from a haptic actuator is detected. At least one vibration noise metric from the detected vibration noise output and the vibration drive signal is generated. The vibration noise output level is adapted in dependence of the at least one vibration noise metric.

The invention relates to a laboratory mill comprising at least one counter-vibration device (27) which has at least one control unit (29a) for providing a counter-vibration signal (29b) and at least one controllable vibration generation unit (29) for converting the counter-vibration signal (29b) into counter-vibrations (30), wherein the vibration-generation unit (29) counteracts a device- and/or housing part (31) of the laboratory mill (1) and the counter-vibrations (30) lead to an active reduction in the vibrations of the device- and/or housing part (31) and/or an at least partial suppression of noise-inducing vibrations of the device- and/or housing part (31), by means of destructive interference.

A method for masking and/or reducing disturbing noises or the conspicuousness thereof when a motor vehicle is being operated includes forming a compensation signal and/or a heterodyne signal based on disturbing noises that are detected in acceleration measurement signals that are received or based on operating states of the motor vehicle or at least of a component of the motor vehicle and using the compensation signal and/or heterodyne signal to modulate an existing control signal of an actuator of the motor vehicle such that the disturbing noises or conspicuousness thereof are reduced and/or at least in part masked. The method further includes influencing the heterodyne signal with a broadband signal or a tonal signal having the predetermined frequencies or arrangements such that the disturbing noises is masked or the conspicuousness of the disturbing noises are reduced.

A printed circuit board (PCB) incorporates at least one damping layer or section. The at least one damping layer is incorporated in the PCB to absorb vibrations or oscillations that may be conveyed to the PCB. Such vibrations or oscillations may be generated by one or more electrical components coupled to the PCB. The damping layer is disposed to prevent the PCB from audibly vibrating when the electrical components associated with the PCB are caused to vibrate or pulsate under a voltage load.

Provided is a control apparatus that includes a tactile control section and an audio control section. The tactile control section generates, on the basis of a tactile signal for tactile presentation, a tactile control signal for driving a tactile presentation unit. The audio control section generates, on the basis of a first audio signal and a second audio signal, an audio control signal for driving an audio output unit, the second audio signal containing sound components that are in an opposite phase to sound generated on the basis of the tactile signal and generated from the tactile presentation unit.

Methods of operating headphones may involve filtering an input signal into a first filtered input signal and a second filtered input signal utilizing a filter. The second filtered input signal may be sent directly to a tactile vibration driver and tactile vibrations may be produced. A fixed, predetermined inverse transfer function may be applied to the first filtered input signal, generating an anti-wave signal. The anti-wave signal may be summed with the first filtered input signal, generating an output signal. Alternatively, a fixed, predetermined transfer function may be applied to the first filtered input signal, generating a modified input signal. The modified input signal may be subtracted from the first filtered input signal, generating an output signal. Audio sound waves may be produced with an acoustic driver responsive to the output signal, reducing effects of incidental acoustic noise generated by the tactile vibration driver.

Examples are disclosed herein that relate to avoiding mechanical noise from operation of a vibrational output device. One example provides a computing device including a processor and a storage device storing instructions executable by the processor to vary a drive voltage applied to a vibrational output device, receive acoustic data, and from the acoustic data detect a noise signal from the vibrational output device as the drive voltage is varied. The instructions are further executable to, based upon the detected noise signal, select an operational drive voltage for the vibrational output device, and operate the vibrational output device using the operational drive voltage.

[Object] To shorten a time until an effect is obtained after start of an adaptive process mode on an ambient sound.

[Solution] Provided is a signal processing device including: a noise cancellation processing unit configured to generate a noise cancellation signal on the basis of a collected ambient sound; a signal processing unit configured to generate an ambient sound adapted signal by performing dynamic analysis related to a feature of the ambient sound and filtering the ambient sound; and a control unit configured to control a plurality of modes related to signal processing. The plurality of modes includes a first mode in which acoustic reproduction based on the noise cancellation signal is performed and a second mode in which acoustic reproduction based on the noise cancellation signal and the ambient sound adapted signal is performed, and the signal processing unit continues the dynamic analysis even in the first mode.

A camera includes one or more microphone pairs. A first microphone (e.g., a main microphone) is ported to the outside of the camera and captures the desired external audio signal, but may also capture undesired vibrational noise. A second microphone has a similar structure to the first microphone, but is not ported to the outside of the camera. Instead, the second microphone is ported into an enclosed cavity (e.g., 1-2 cubic centimeters in volume). The second microphone may pick up the same vibration excitation and internal acoustic noise as the first microphone but very little of the desired external acoustic sounds around the camera. The unwanted noise can then be removed by subtracting the second audio signal from the second microphone from the main audio signal from the main microphone.