In one example, a headset obtains, from a first microphone on the headset, a first audio signal including a user audio signal and an anisotropic background audio signal. The headset obtains, from a second microphone on the headset, a second audio signal including the user audio signal and the anisotropic background audio signal. The headset extracts, from the first audio signal and the second audio signal, using a first adaptive filter, a reference audio signal including the anisotropic background audio signal. Based on the reference signal, the headset cancels, using a second adaptive filter, the anisotropic background audio signal from a third audio signal derived from the first and second audio signals to produce an output audio signal. The headset provides the output audio signal to a receiver device.

A device and method for the continuous monitoring of otoacoustic emissions (OAE) levels on an individual worker uses as a pair of earpieces each featuring an external microphone, an internal microphone and a pair of miniature receivers. An adaptive filtering noise rejection processing of the measured distortion product OAE (DPOAE) is used to further improve the Signal-to-Noise ratio in frequencies where passive isolation remains insufficient. The adaptive filtering noise rejection technique relies on a Normalized Least-Mean-Square (NLMS) algorithm that uses the ipsilateral external microphone and the contralateral internal microphone to reject the noise from the measured DPOAE signals for each in-ear OAE probe. A DPOAE signal extraction algorithm provides for an increase in results reliability on a greater dynamic range in DPOAE magnitudes than known methods of DPOAE signal extraction. The device and method is suitable for the continuous monitoring of workers' hearing capabilities in industrial noises up to 75 dB(A).

A hearing protector device (9) comprising a controller (11), a memory (14), and a receiver (12) is provided. The controller (11) is configured to be connected to the memory (14), the receiver (12) and an at least one user-notifying device (31) adapted to notify a hearing protector user. The hearing protector device (9) is configured to receive at least one data transmission signal from a data transmission device (20); storing at least one signal parameter; and comparing said data transmission signal to the at least one stored signal parameter. The at least one stored signal parameter is associated with at least one suitable notification; wherein the user-notifying device (31) is configured to, when the signal from the data transmission device (20) matches the signal parameter, present the at least one notification associated to the signal parameter to the hearing protector user. A data transmission device (20) comprising a processor (21) configured to be connected to an external signal receiver (22) and a data device transmitter (23) is also provided, wherein the data transmission device (20) is configured to receive at least one external signal from an external source (40) and transmit a data transmission signal configured to be received by at least one hearing protector device (9).

A hearing protector device (9) comprising a controller (11), a memory (14), and a receiver (12) is provided. The controller (11) is configured to be connected to the memory (14), the receiver (12) and an at least one user-notifying device (31) adapted to notify a hearing protector user. The hearing protector device (9) is configured to receive at least one data transmission signal from a data transmission device (20); storing at least one signal parameter; and comparing said data transmission signal to the at least one stored signal parameter. The at least one stored signal parameter is associated with at least one suitable notification; wherein the user-notifying device (31) is configured to, when the signal from the data transmission device (20) matches the signal parameter, present the at least one notification associated to the signal parameter to the hearing protector user. A data transmission device (20) comprising a processor (21) configured to be connected to an external signal receiver (22) and a data device transmitter (23) is also provided, wherein the data transmission device (20) is configured to receive at least one external signal from an external source (40) and transmit a data transmission signal configured to be received by at least one hearing protector device (9).

The present disclosure provides a noise reduction processing method, system and terminal device. In the present disclosure, a position angle of a far-field audio input sound source and a microphone array as well as a rotation angle of a head servo of a robot are obtained, and then a target rotation angle of the robot is calculated. The head servo of the robot is controlled to rotate according to the target rotation angle such that the robot moves along with the far-field sound source, and a beam area is changed according to the target rotation angle to enable a sound source enhancement area to process far-field audios. As a result, the noise reduction performance of the microphone array beam is effectively improved.

Methods, systems, and devices for signal processing are described. Generally, as provided for by the described techniques, a wearable device may receive an input audio signal (e.g., including both an external signal and a self-voice signal). The wearable device may detect the self-voice signal in the input audio signal based on a self-voice activity detection (SVAD) procedure, and may implement the described techniques based thereon. The wearable device may perform beamforming operations or other separation procedures to isolate the external signal and the self-voice signal from the input audio signal. The wearable device may apply a first filter to the external signal, and a second filter to the self-voice signal. The wearable device may then mix the filtered signals, and generate an output signal that sounds natural to the user.

The application describes a MEMS transducer in which first and second conductive elements of a capacitor are both provided on the membrane. The membrane is shaped such that the first and second conductive elements are displaced relative to each other when the flexible membrane deflects in response to a pressure differential across the membrane. For example the membrane may be corrugated.

An ear and ear headphone shielding assembly, for comfortably laying on an ear with headphones therein, includes a panel and a cushion member. The panel has an inner surface and an outer surface. The inner surface is concavely shaped, while the outer surface is convexly shaped. The panel has a perimeter edge including a top edge, a bottom edge, a first side edge, and a second side edge. The inner surface is shaped as to form a hold to receive an ear such that the ear is adjacent to the inner surface. A cushion member is attached to the perimeter edge as to be coextensive with the top edge, the first side edge and the second side edge, leaving the bottom edge free of the cushion member.

An ear and ear headphone shielding assembly, for comfortably laying on an ear with headphones therein, includes a panel and a cushion member. The panel has an inner surface and an outer surface. The inner surface is concavely shaped, while the outer surface is convexly shaped. The panel has a perimeter edge including a top edge, a bottom edge, a first side edge, and a second side edge. The inner surface is shaped as to form a hold to receive an ear such that the ear is adjacent to the inner surface. A cushion member is attached to the perimeter edge as to be coextensive with the top edge, the first side edge and the second side edge, leaving the bottom edge free of the cushion member.

In some examples, an acoustic headset for providing hearing protection, includes: a first auditory cup; a second auditory cup; at least one of a stirrup or headband interconnecting the first and second auditory cups; at least one speaker integrated within at least one of the first auditory cup or the second auditory cup; a microphone that receives sound, wherein the microphone is coupled to the acoustic headset; and wherein at least one of the first and second auditory cups comprises a digital component for transmission and receipt of digital wireless audio communications, and wherein at least one of the first and second auditory cups comprises an analog component for transmission and receipt of analog wireless audio communications.