Microphone array and method for implementing voice signal enhancement

Abstract

The invention discloses a microphone array and a method for realizing the speech signal enhancement and is characterized in that firstly N matrix elements with factors in the same unit direction are uniformly and radially arranged outward on a circle with the radius of R; a circular array with radian ranges of 2Pi for receiving and treating signals is formed; or the matrix elements are uniformly and radially arranged outward on a passage of circular arc with the radius of R and a central angle of Phi to form part of a circular array for receiving and treating signals with the radian ranges of Phi; the weighted value of each matrix element and weighted vector corresponding with the incident direction in the radian ranges of 2Pi / N are calculated according to the center frequencies of audio signals of the array to be treated based on the expected signal doa; then weighted vectors of the whole circular array or part of the circular array or other incident directions is obtained by making use of cyclic shifting; finally, signals received on each matrix element are weighted and combined according to calculated weighted values.

Description

technical field [0001] The invention relates to an array signal processing system, in particular to a microphone array and a method for enhancing voice signals. Background technique [0002] Array signal processing is an important branch in the field of signal processing, and has a wide range of applications in many fields such as communication and radar. Array signal processing is to arrange multiple sensors at different positions in the space to form a sensor array, and use this array to receive (multi-point parallel sampling) and process the space signal, the purpose is to extract the signal and characteristic information (parameters) received by the array. ), while suppressing interference and noise or other uninteresting information. In the process of receiving speech signals, it is inevitable to be interfered by external environmental noise and other speakers. In response to this situation, a microphone array can usually be used to enhance speech and remove backgroun...

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Problems solved by technology

[0006] Aiming at the problem that the above-mentioned uniform linear array is sensitive to directionality and the frequency slicing method has a large amount of computation, the present invention provides a circular antenna array based on centrosymmetry and its corresponding speech enhancement method

Based on the symmetric characteristics of the circular antenna array, the system achieves the effect of insensitivity to directionality and insensitivity to frequency, and solves the problem of large amount of calculation when using a uniform line array to process broadband signals. Arrays provide an effective and convenient method for speech enhancement

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