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A microphone array beamforming method

A microphone array and microphone technology, which is applied in voice analysis, instruments, etc., can solve problems such as easy judgment errors of DOA, and achieve the effect of strong anti-interference ability and overall robust algorithm

Active Publication Date: 2022-03-22
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

Method used

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  • A microphone array beamforming method
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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. Aiming at the problem that the microphone array beamforming algorithm cannot well estimate the noise and interference covariance matrix and the steering vector of the source voice signal in a noisy and multi-speech interference environment, the invention proposes a microphone array beamforming method. The present invention constructs a direction template on the basis of traditional microphone array beamforming, uses the phase difference vector of the time-frequency unit signal and the angle cosine of different direction templates to obtain the time-frequency masking value TFmask, and uses a relatively low amount of calculation in the short-term In the Liye transform domain, the source signal is separated from the speech interference in other directions as much as possible.

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 Patents(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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