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Method for optimizing speech enhancement of microphone array

A technology of microphone array and optimization method, which is applied in speech analysis, instruments, etc., can solve problems affecting speech enhancement performance, target signal leakage, etc., to reduce target speech leakage, improve robustness, improve output signal-to-noise ratio and clarity degree of effect

Inactive Publication Date: 2012-09-12
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

However, the most likely problem with array processing is that when there is an error in the direction estimation of the target signal, it is easy to cause leakage of the target signal, which seriously affects the performance of speech enhancement.

Method used

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  • Method for optimizing speech enhancement of microphone array
  • Method for optimizing speech enhancement of microphone array
  • Method for optimizing speech enhancement of microphone array

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Embodiment Construction

[0019] combine figure 1 , the microphone array voice enhancement optimization method of the GSC structure of the present invention, the steps are as follows:

[0020] The first step is to preprocess, that is, to M input voice signal After pre-emphasis, framing and windowing processing, the DOA (Direction Of Arrival) of the signal is estimated by using the different arrival times of the signal and the phase shift characteristics between the sampling signals of each microphone array element. The specific process is as follows:

[0021] (1) Preprocess the voice signal, the pre-emphasis factor is 0.96, 16kHz sampling, divided into frames according to 512 sampling points, and the frame is shifted to 256 sampling points, and then use the Hamming window for windowing processing;

[0022] (2) Compare the correlation between the two array element frame signals, calculate the phase shift and time delay between two adjacent signals, estimate the DOA of the signal, and use the obtaine...

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Abstract

The invention discloses a method for optimizing speech enhancement of a microphone array, belongs to the technical field of speech signal processing and relates to speech enhancement technologies, in particular to the speech enhancement of the microphone array. According to the method, firstly a generalized sidelobe canceller (GSC) structure is utilized, and in order to solve the problem of speech leakage of the generalized sidelobe canceller caused by a wrong direction of arrival of signals, a blockmatrix is subjected to a self-adaption adjustment by means of a characteristic of relevance between the output of the GSC and the output of the blockmatrix, so that the blockmatrix can approach to the direction of a target speech, the target speech leakage in the blockmatrix is reduced, and the robustness of a system is enhanced.

Description

technical field [0001] The invention relates to speech enhancement technology, in particular to microphone array speech enhancement, and belongs to the technical field of speech signal processing. Background technique [0002] Speech enhancement has always been a research hotspot in the field of speech signal processing, and the introduction of microphone array processing provides a new approach to speech enhancement. The microphone array not only provides the information of the signal in the time domain and frequency domain, but also provides a space domain to perform space-time-frequency joint processing on signals from different directions in space. It is based on the algorithm of the antenna array and combines single-channel The speech processing method uses a spatial filter to provide the spatial position of the sound source signal, so as to achieve the purpose of filtering the sound source signal and suppressing the interference signal at the same time. [0003] The g...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L21/02
Inventor 王辉张玲华
Owner NANJING UNIV OF POSTS & TELECOMM
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