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Wind noise suppression method used for dual-microphone digital hearing-aid

A technology of dual microphones and hearing aids, applied in hearing aids, instruments, speech analysis, etc., can solve problems such as missed detection or false detection, and achieve the effect of improving hearing aid effect and reducing wind noise.

Inactive Publication Date: 2011-11-23
SHANGHAI CONGWEI ACOUSTICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the case of stationary noise or high signal-to-noise ratio, the effect is better, but in the case of low signal-to-noise ratio, it is often prone to missed detection or false detection.

Method used

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  • Wind noise suppression method used for dual-microphone digital hearing-aid
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  • Wind noise suppression method used for dual-microphone digital hearing-aid

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Embodiment Construction

[0019] see figure 1 , the wind noise suppression method for dual-microphone digital hearing aid of the present invention mainly comprises the following steps:

[0020] In the first step, the signals connected to the left and right microphones at the same time are divided into frames with a preset frame length to form a left group multi-frame input signal containing multiple left frames and a right frame signal containing multiple right frames. A group of multi-frame input signals, and each left frame and right frame are in one-to-one correspondence. In this embodiment, the frame length of each frame is preset to 20ms, and there is a 10ms overlap between the two frames before and after. If the sampling rate is 16kHz, the frame length of the left frame and the right frame are both 320 sampling points, and the The overlap between them is 160 sampling points.

[0021] The second step is to calculate the signal energy value of a left frame in the left group of multi-frame input s...

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Abstract

The invention relates to a wind noise suppression method used for a dual-microphone digital hearing-aid. The method comprises the following steps of: respectively carrying out framing processing on respectively accessed signals of a left microphone and a right microphone at the same time interval according to a preset frame length; then respectively calculating signal energy values of a left frame and a corresponding right frame as well as cross correlation coefficients of the left and the right frames in a left group of multiframe input signals and a right group of multiframe input signals; judging whether the current left frame and the current right frame which are calculated currently are voice frames or noise frames according to the preset single-microphone short-time energy threshold value and the preset double-microphone correlation proportion threshold value as well as the calculated respective signal energy values and the cross correlation coefficients of the left frame and the right frame, so as to be taken as the basis of a subsequent left frame and a subsequent right frame; when respective former left frame and respective former right frame of the calculated current left frame and the calculated right frame are voice frames, outputting the current left frame and the current right frame as the voice frames; and otherwise, outputting the current left frame and the current left frame through highpass filtering. Therefore, according to the invention, the wind noise is reduced, and the hearing aid effect is improved.

Description

technical field [0001] The invention relates to a wind noise suppression method for a digital hearing aid, in particular to a wind noise suppression method for a dual-microphone digital hearing aid. Background technique [0002] The noise problem has always been a big problem for hearing aid wearers, and improving the speech clarity and comfort of hearing aids in noisy environments has always been the focus of hearing aid research. There are many kinds of noise in life, which can be divided into instantaneous noise, steady noise and inter-speech noise according to the spectrum classification. In addition, in some specific environments, there will also be some "speech noise", such as parties, when there are many people. There are also certain noises that appear after wearing hearing aids, such as howling, machine noise, wind noise, etc. [0003] Wind noise is due to the turbulence of the air at the microphone port, which causes the microphone to vibrate irregularly, and is ...

Claims

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Application Information

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IPC IPC(8): G10L21/02H04R25/00G10L21/0208
Inventor 殷海庭
Owner SHANGHAI CONGWEI ACOUSTICS TECH
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