Microphone array beam forming method

A microphone array and microphone technology, applied in speech analysis, instruments and other directions, can solve the problem of easy judgment and error of DOA, and achieve the effect of strong anti-interference ability and overall robust algorithm.

Active Publication Date: 2020-03-27
HANGZHOU NATCHIP SCI & TECH
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Problems solved by technology

However, in actual scenarios, there is often a certain amount of signal refraction, which brings great challenges to DOA, especially when signal refraction coexists with multiple strong interferences and the number of microphones is small, DOA is extremely easy to misjudge

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Embodiment Construction

[0028] In order to facilitate the understanding of the present invention, and to make the above objects, features and advantages of the present invention more obvious and understandable, the specific implementation manners of the present invention will be described in detail below in conjunction with the accompanying drawings. In the following description numerous specific details are set forth in order to provide a thorough understanding of the invention, and preferred embodiments of the invention are shown in the accompanying drawings. However, the present invention can be embodied in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive. The present invention can be implemented in many ways other than those described here, and those skilled in the art can make similar improvements without departing from the con...

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Abstract

The invention discloses a microphone array beam forming method. The invention provides a microphone array beam forming method for solving the problem that a microphone array beam forming algorithm cannot well estimate a noise and interference covariance matrix and a source voice signal steering vector in a noisy and multi-voice interference environment. According to the invention, on the basis oftraditional microphone array beam forming; a direction template is constructed, a time-frequency masking value TFmask is obtained by using a phase difference vector of a time-frequency unit signal andan included angle cosine of different direction templates, and voice interference of a source signal and voice interference of other directions are distinguished as much as possible in a short-time Fourier transform domain with a relatively low calculated amount.

Description

technical field [0001] The invention belongs to the technical field of noise and interference suppression, and in particular relates to a microphone array beamforming method. Background technique [0002] Microphone array beamforming estimates the environmental covariance matrix (noise and interference) and the source voice signal steering vector. In order to improve the quality of voice calls and improve the accuracy of intelligent voice interaction, the relevant beam form filter weights are designed to improve signal interference and noise. The purpose of Signal-to-Interferences-plus-Noise Ratio (SINR). [0003] The effectiveness of traditional microphone array beamforming methods depends on the accuracy of the estimation of the environmental covariance matrix and the steering vector of the source speech signal. [0004] There are two commonly used methods for estimating the environmental covariance matrix: (1) Use the Voice Activity Detection (VAD) algorithm to estimate ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L21/0216G10L21/0232G10L21/0264
CPCG10L21/0216G10L21/0232G10L21/0264G10L2021/02166
Inventor 卢燕梁骏姚欢王坤鹏陈谢汪文轩沈旭东
Owner HANGZHOU NATCHIP SCI & TECH
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