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Method used for improving speech enhancement performance of microphone array

A microphone array and speech enhancement technology, which is applied in speech analysis, instruments, etc., can solve the problem of poor enhancement results, and achieve the effect of strong applicability and low computational complexity

Inactive Publication Date: 2016-10-12
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The more speech signals in the reference channel, the more speech signals will be lost when the noise is eliminated, and the worse the enhancement result will be.
However, in a practical environment, it is impossible for the reference channel to contain only noise signals

Method used

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  • Method used for improving speech enhancement performance of microphone array
  • Method used for improving speech enhancement performance of microphone array
  • Method used for improving speech enhancement performance of microphone array

Examples

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Effect test

Embodiment

[0136] Extract a piece of speech signal and music, and use the music as a noise signal. The sampling rate of both the speech signal and the noise signal is 16kHz. For simulation, the transfer functions of the speech signal to the main channel and the reference channel are set as:

[0137] H s0 (z)=[0.0408,0.0817,0.1633,0.1225,0.0408,0.2048,0.2450.0.0817]z

[0138] H s1 (z)=[0.1293,0.1293,0.0970,0.2587,0.0647,0.0323,0.0970,0.1617]z

[0139] The transfer functions of the noise signal to the main channel and the reference channel are respectively set as:

[0140] H n0 (z)=[0.1187,0.2960,0.1781,0.0594,0.0000,0.0000,0.2375,0.0594]z

[0141] H n1 (z)=[0.1309,0.2182,0.2618,0.000,0.0873,0.0000,0.0436,0.2182]z

[0142] Among them, z=[1,z -1 ,z -2 ,z -3 ,z -4 ,z -5 ,z -6 ,z -7 ] T .

[0143] According to s 0 (k)=h s0 (k)*s(k) can get the voice signal s in the main channel 0 (k), according to n 0 (k)=h n0 (k)*n(k) can get the noise signal n in the main channel 0 (k...

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Abstract

The invention provides a method used for improving the speech enhancement algorithm performance of a microphone array. The method comprises the steps that a speech detector detects whether a primary channel is currently a speech-time HSP or a non-speech-time NSP; in NSP, a first filter adaptively adjusts the coefficient of the first filter based on an input signal, so that the energy of an output signal of the first filter is minimized; in HSP, the coefficient of the first filter is locked without adjustment, and the input signal is directly filtered based on the filter coefficient set in NSP; the current output signal of the first filter is used the input of the second filter; self-adaptive filtering is carried out on a primary channel signal; and by adaptively adjusting the coefficient of the second filter, the energy of the output signal of the second filter is minimized to acquire anti-crosstalk and noise-canceled speech output. According to the invention, the speech enhancement effect can be improved to a certain extent.

Description

technical field [0001] The invention belongs to the speech processing technology, and in particular relates to a method for improving the speech enhancement performance of a microphone array. Background technique [0002] The acoustic environment is very complex. When the microphone picks up the speech signal, it will also receive various noises: the reverberation of buildings, interfering sound sources, electrical noise, etc. It is difficult for traditional voice pickup tools to provide a good anti-noise capability, so people have proposed a voice enhancement technology with a microphone column. Take advantage of the spatial selectivity of the microphone array to focus on one or more sound sources of interest. The microphone array has sensitive beam directivity and excellent spatial filtering. [0003] Among many speech enhancement algorithms, adaptive noise cancellation (ANC) is an important part. Its computational complexity is not high, and it can be used to deal with...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L21/0208G10L21/0216
CPCG10L21/0208G10L21/0216G10L2021/02166
Inventor 汤煜华于鸿洋王昭婧
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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