MVDR target sound source directional pickup method for microphone array

A microphone and target technology, applied in positioning, instruments, measuring devices, etc., can solve problems that cannot meet the needs of sound source positioning, achieve high-quality application services, improve receiving effects and efficiency, and improve accuracy

Active Publication Date: 2020-04-21
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] For this reason, the technical problem to be solved by the present invention is that the sound source localization algorithm in the prior art has its own defects, and cannot meet the increasing demand for sound source localization. MVDR target sound source directional pickup method for microphone array

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  • MVDR target sound source directional pickup method for microphone array
  • MVDR target sound source directional pickup method for microphone array
  • MVDR target sound source directional pickup method for microphone array

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Embodiment Construction

[0058] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0059] Such as figure 1 Shown is a preferred embodiment of the present invention's MVDR target sound source directional pickup method for microphone arrays. In the present invention, the microphone square array includes four array elements, each array element is a microphone, and the four microphones form a square area array. Directional pickup is possible with four omnidirectional microphones.

[0060] The present invention is used for the MVDR target sound...

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Abstract

The invention relates to the field of acoustic signal processing, and aims to provide an MVDR target sound source directional pickup method for a microphone array. The method is small in calculation amount, high in positioning precision and capable of achieving directional collection of multiple target sound sources. The method comprises the steps of 1, acquiring all sound source signals in a preset sound intensity level range to obtain a sound source signal observation matrix; 2, carrying out filtering, framing and the like on the sound source observation matrix, and calculating a short-timespectrum; 3, determining the approximate orientation of a target sound source corresponding to the peak value position with the minimum delay on a cross-correlation curve by using a TDOA method; 4, determining the accurate position of the target sound source by using an MVDR method in the approximate orientation range of the target sound source; 5, directionally acquiring signals of the target sound source according to the accurate position of the target sound source; and 6, when there are two or more target sound sources, repeating the steps 3-5 at other peak positions of the original cross-correlation curve until directional pickup of all target sound sources is completed. According to the invention, the actual requirement of signal collection of multiple target sound sources is solved.

Description

technical field [0001] The invention relates to the technical field of acoustic signal processing, in particular to an MVDR target sound source directional sound pickup method for a microphone array. Background technique [0002] Microphone Array (Microphone Array) refers to the arrangement of microphones, that is to say, a system composed of a certain number of acoustic sensors (usually microphones) for sampling and processing the spatial characteristics of the sound field. Each microphone in a microphone array is called an element. [0003] The microphone array plays a very important role in the processing of voice signals, and it has many advantages that a single microphone cannot achieve: first, the microphone array has a wider pickup range; second, the appearance of the microphone array makes the voice signal processing easier Restricted to the time domain and frequency domain, the voice signal can also be processed according to the spatial coordinates to promote the f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S5/20
CPCG01S5/20
Inventor 刘若伦张亮朱颖
Owner SHANDONG UNIV
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