Method for positioning sound source by using microphone array

Abstract

The invention provides a method for positioning a sound source by using a microphone array. Three microphones are arranged in an equilateral triangle. The method comprises the following steps of: establishing a coordinate system, wherein an origin point of the coordinate system is coincided with the center of gravity of the equilateral triangle, and a first microphone is positioned in a longitudinal axis of the coordinate system; connecting the center of gravity of the equilateral triangle with three vertexes of the equilateral triangle, extending, and dividing an entire circumference into six equal intervals; calculating time differences between the sound source and the first microphone, between the sound source and the second microphone, and between the sound source and the third microphone; multiplying the time differences by a sound velocity to obtain a first distance difference between a distance from the sound source to the second microphone and a distance from the sound source to the first microphone and a second distance difference between a distance from the sound source to the third microphone and a distance from the sound source to the first microphone; preliminarily determining the interval in which the sound source falls relative to an azimuth angle phi of the center of gravity of the equilateral triangle according to symbols of the first distance difference and the second distance difference and comparison of absolute values of the first distance difference and the second distance difference; and approximating the distance R from the sound source to the center of gravity of the equilateral triangle and the azimuth angle phi to optimization points by a 0.618 method.

Description

technical field [0001] The present invention relates to localization of sound sources, and more particularly to a method of localizing sound sources using a microphone (MIC) array. Background technique [0002] Array signal processing has been widely used in many fields such as communication, radar, sonar, medicine and aerospace. In recent years, with the development of the war on terrorism, various countries have developed various devices for detecting the location of explosion points or gun firing points. In practical applications, because visual positioning is often difficult to achieve, some acoustic positioning systems have been developed, for example, the boomerang system of the United States, the anti-sniper sound detection system of Rafael of Israel, and the Macdonald Dieter of Canada. Viley and the Canadian Defense Research and Development Council have also jointly developed a small arms detection and location system called Ferret. The new Vista operating system d...

AI Technical Summary

Problems solved by technology

[0004] The method of directional wave velocity formation needs to scan the entire space in order to search for the position where the beam power can be maximized, and requires a lot of calculations, so it is difficult to meet the real-time requirements

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