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Microphone array beamforming method based on reverberation environment

A microphone array and microphone technology, which can be used in speech analysis, instruments, sensor parts, etc., and can solve problems such as high computational complexity and difficulty in implementation.

Active Publication Date: 2020-10-09
江苏新视云科技股份有限公司
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  • Claims
  • Application Information

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Problems solved by technology

Although the linear constrained minimum variance beamformer (LCMV) method with spatial directivity can remove reverberation in theory, it has high computational complexity and is difficult to implement in practice.

Method used

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  • Microphone array beamforming method based on reverberation environment
  • Microphone array beamforming method based on reverberation environment
  • Microphone array beamforming method based on reverberation environment

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Embodiment Construction

[0050] The technical scheme of the present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it, but the examples given are not intended to limit the present invention.

[0051] Such as Figure 1-7 As shown, a microphone array beamforming method based on a reverberant environment includes the following steps:

[0052] Step 1. Obtain the signal received by the microphone:

[0053] In a closed indoor environment, a uniform line array is composed of N identical omnidirectional microphones, and there are M voice signals at the position r m ,m=1,...,M, where the position of the target speech signal is r 1 , the signals at other positions are interference signals, N>M, then the signal x received by the nth microphone n (k) is expressed as:

[0054]

[0055] In the formula, H nm,l is the room impulse response from...

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Abstract

The invention discloses a microphone array beam forming method based on a reverberant environment. The method comprises the following steps: 1, acquiring signals received by virtue of microphones; 2, conducting framing windowing treatment on a signal xn(k) received by the n microphone, so as to obtain a windowed signal xnw(k) received by the n microphone; 3, conducting Fourier transform of the i frequency point on the windowed signal xnw(k) received by the n microphone; 4, acquiring an output signal on the basis of a method of Wiener filtering; and 5, acquiring an output signal of a microphone array beam former by virtue of a LCMV (linearly constrained minimum variance) beam forming method based on Wiener filtering. The beam forming method, which is applicable to any array structures, can effectively inhibit a problem of reverberation of a microphone array.

Description

technical field [0001] The invention relates to a microphone array beamforming method based on a reverberation environment. Background technique [0002] Beamforming technology has been widely used in speech communication systems, teleconferencing, speech recognition and hearing aids. Beamforming acts as a spatial filter to extract target signals from mixed signals received by a group of microphones. At present, beamformers include classic broadband beamformers such as fixed beamforming and minimum variance distortionless response (MVDR), but the frequency invariance of the array response is poor, and the width of the main lobe decreases with the increase of frequency. , signal distortion and so on. In order to solve the distortion of broadband beams, the least square method, convex optimization method, special array structure method, space response constraint method, etc. have appeared. Although these methods improve the frequency invariance, the above methods are not suit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L21/0208G10L21/0272H04R3/00
CPCG10L21/0208G10L21/0272H04R3/005
Inventor 郭业才陈小燕韩金金禹胜林
Owner 江苏新视云科技股份有限公司