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LS beam-forming reverberation suppression method based on Wiener post-filter

A post-filtering and beam technology, applied in speech analysis, instruments, etc., can solve problems such as the limitation of application scope, and achieve the effect of improving the accuracy of reverberation suppression and speech quality

Active Publication Date: 2018-06-15
NANJING UNIV OF INFORMATION SCI & TECH
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Problems solved by technology

McCowan used the mathematical model of the diffuse noise field to discuss the problem of solving the noise correlation of different channels in the diffuse noise field. This algorithm requires the noise coherence function to be obtained in advance, and the scope of application is limited.

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  • LS beam-forming reverberation suppression method based on Wiener post-filter
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  • LS beam-forming reverberation suppression method based on Wiener post-filter

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0020] figure 1 It is the schematic diagram of LS beamforming reverberation suppression method based on Wiener post-filtering, in figure 1 A uniform linear array is composed of M identical omnidirectional microphones, and there are N voice signals (M>N).

[0021] Step 1. Assume that the signal collected by the microphone is the original speech signal after delay and attenuation plus certain additive noise. Then the signal x received by the mth microphone m (k) = α m the s n (k)+v m (k), where α m , m=1,...M represents the attenuation factor caused by the propagation effect; s n (k), n=1,...N is the voice signal from the nth voice to the mth microphone; v m (k) represents the noise signa...

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Abstract

The invention provides a least squares beam-forming reverberation suppression method with Wiener post-filtering. According to the method, a voice signal after reverberation is divided into a direct arrival part and a reverberation part to obtain Wiener post-filter gain estimation; because of the high noise correlation of the low-frequency part of the voice signal, frequency division is carried outby using a least squares beam forming algorithm; and then an optimal weight value is calculated. The method has the following advantages: the signal after reverberation is divided into the direct arrival part and the reverberation part to obtain the improved Wiener post-filter gain estimation, the voice signal after reverberation is divided into a high-frequency component and a low-frequency component because of the high noise correlation of the low-frequency part of the voice signal, and then optimal weight values of the high-frequency component and the low-frequency component are calculatedby using the least squares beam forming algorithm, so that the reverberation suppression accuracy and voice quality are improved.

Description

technical field [0001] The invention relates to a least square (LS) beamforming reverberation suppression method based on Wiener post-filtering, and belongs to the technical field of microphone array beamforming. Background technique [0002] Microphone array is an effective tool for speech acquisition, and it is widely used in speech recognition, video conference hearing aids, etc. Beamforming is an important microphone array processing technology. Its main purpose is to form a beam for useful signals in a specific direction while suppressing interference signals and noise in other directions. [2] . In recent years, with the deepening of people's research on voice communication, microphone arrays have been more widely used. [0003] Speech signals in closed-space environments are often distorted by reverberation. In speech communication applications with multiple distributed microphones, it is often desirable to quantify the amount of reverberation in the perceived signa...

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Application Information

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IPC IPC(8): G10L21/0208G10L21/0216
CPCG10L21/0208G10L21/0216G10L2021/02082G10L2021/02166
Inventor 张秀再王婷郭业才陈小燕
Owner NANJING UNIV OF INFORMATION SCI & TECH
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