Disclosed are a directional acoustic sensor, a method of adjusting directional characteristics using the directional acoustic sensor, and a method of attenuating an acoustic signal in a specific direction using the directional acoustic sensor. The directional acoustic sensor includes a plurality of resonance units arranged to have different directionalities and a signal processor configured to adjust directional characteristics by calculating at least one of a sum of and a difference between outputs of the resonance units. In this state, the signal processor attenuates an acoustic signal in a specific direction by using a plurality of directional characteristics obtained by calculating at least one of the sum of and the difference between the outputs of the resonance units at a certain ratio.

A signal processing apparatus that processes a plurality of audio signals obtained by acquiring a sound in a target area by performing sound acquisition by a plurality of sound acquisition units, comprising: a specification unit configured to specify a position of a sound source in the target area and positions and directivities of the plurality of sound acquisition units; and a selection unit configured to select, among the plurality of audio signals based on the sound acquisition by the plurality of sound acquisition units, an audio signal to be played back based on a degree of misalignment of the directivity of each of the plurality of sound acquisition units with respect to the specified position of the sound source.

Method to perform dynamic beamforming to reduce SNR in signals captured by head-wearable apparatus starts with microphones generating acoustic signals. Microphones are coupled to first stem of the apparatus and to second stem of the apparatus. First and second beamformers generate first and second beamformer signals, respectively. Noise suppressor attenuates noise content from the first beamformer signal and the second beamformer signal. Noise content from first beamformer signal are acoustic signals not collocated in second beamformer signal and noise content from second beamformer signal are acoustic signals not collocated in first beamformer signal. Speech enhancer generates clean signal comprising speech content from first noise-suppressed signal and second noise-suppressed signal. Speech content are acoustic signals collocated in first beamformer signal and second beamformer signal.

An electrical device for reducing noise, comprises a first microphone configured to receive soundwave from a sound source and convert the soundwave to a first electrical signal including a noise component, a second microphone configured to receive ambient noise from an ambient environment and convert the ambient noise to a second electrical signal. The second electrical signal is reversed in polarity to the first electrical signal. The electrical device further comprises a circuit connecting the first microphone and the second microphone. The circuit is configured to combine the first electrical signal and the second electrical signal in order to reduce the noise component in the first electrical signal with the second electrical signal that is reversed in polarity.

A system for detecting feedforward instability in a wearable audio device. The audio device includes an electro-acoustic transducer that is configured to develop sound for a user, a housing that holds the transducer, a feedforward microphone that is configured to detect sound outside of the housing and output a microphone signal, and an opening in the housing that emits sound pressure from the transducer that can reach the microphone. A feedforward instability detector is configured to apply two filters to the microphone signal. A first filter passes more energy in a frequency band than does a second filter, to develop a filtered signal. The filtered signal is compared to the microphone signal outside of the frequency band, to develop a comparison signal that is indicative of feedforward instability in the frequency band.

The present disclosure relates to a wireless listening device, which includes a housing adapted to be wearable and a top cover. The top cover closes the housing at an end of the device and is provided with a central bumped portion that includes: a substantially planar panel portion; and a raised portion, which is connected around an outer periphery of the panel portion and at least partially extends toward the housing in a direction perpendicular to a plane where the panel portion is located. The panel portion and the raised portion form an accommodating groove that at least partially accommodate a charging device, a manipulation device and an antenna. In the plane where the panel portion is located, a diameter of a minimum circumscribed circle of orthographic projections of the charging device, the manipulation device, and the antenna as a whole is in a range of 8 to 16 mm.

A microphone system of the invention is applicable to an electronic device comprising an adjustable mechanism that causes a change in geometry of a microphone array. The microphone system comprises the microphone array, a sensor and a beamformer. The microphone array comprises multiple microphones that detect sound and generate multiple audio signals. The sensor detects a mechanism variation of the electronic device to generate a sensing output. The beamformer is configured to perform a set of operations comprising: performing a spatial filtering operation over the multiple audio signals using a trained model based on the sensing output, one or more first sound sources in one or more desired directions and one or more second sound sources in one or more undesired directions to generate a beamformed output signal originated from the one or more first sound sources.

In one embodiment, a MEMS microphone can be coupled to an acoustic horn to provide various benefits and improvements including, but not limited to, at-a-distance acoustic signal reception with improvements in signal-to-noise ratio and directional preference.

An ear cup housing has several reference microphones, an error microphone and a speaker. A processor drives the speaker for acoustic noise cancellation and transparency, by processing the microphone signals, and performs an oversight process by adjusting the reference microphone signals in response to detecting wind noise events and scratch events. In another aspect, the ear cup housing has an outside face that is joined to an inside face by a perimeter and the reference microphones are on the perimeter. Other aspects are also described and claimed.

A method, an apparatus and a device for processing sound signals are provided in the present application. The method comprises: receiving a first sound signal through a first sound reception apparatus and a second sound signal through a second sound reception apparatus respectively; the first sound reception apparatus and the second sound reception apparatus have a corresponding reception delay constant therebetween; performing delay processing on the first sound signal according to the reception delay constant at each signal processing time to acquire a signal correlation coefficient between the first sound signal after the delay processing and the second sound signal; detecting whether the first sound signal and the second sound signal include a coherent noise signal according to the signal correlation coefficient between the first sound signal after the delay processing and the second sound signal; filtering out the coherent noise signal from the first sound signal and the second sound signal when the coherent noise signal is included in the first sound signal and the second sound signal to acquire and output a target sound signal at a corresponding signal processing time.