Method for umbrella-type reconfigurable three-dimensional microphone array to recognize three-dimensional coordinates of sound source

Abstract

The invention provides a method for an umbrella-type reconfigurable three-dimensional microphone array to recognize the three-dimensional coordinates of a sound source. According to the method, based on a near-field spherical wave sound field and beam forming principles, with an umbrella-type array used in combination, the three-dimensional coordinates of the sound source can be recognized. With the umbrella-type array adopted, pseudo sound sources at the front side or back side of the array can be eliminated, the problem of front-and-back fuzziness caused by the limitations of a two-dimensional array can be eliminated; HPWB (namely, 3dB bandwidth of which the physical meaning is that bandwidth before power is decreased by half represents half power is accumulated in the bandwidth) is adopted as an evaluation index; the recognition and positioning effects of the umbrella-type reconfigurable three-dimensional microphone array for sound sources in an X axis and a Y axis are obviously better than that of a spoke array.

Description

technical field [0001] The invention belongs to the interdisciplinary fields of structural acoustics, aeroacoustics, hydroacoustics, signal processing, image processing, noise-vibration control, etc., and specifically relates to a method for identifying three-dimensional coordinates of a sound source by using an umbrella-shaped reconfigurable three-dimensional microphone array. Background technique [0002] The performance of the beamformer array depends largely on the design of the geometric array itself, and the difference in the array layout will have a great impact on the sound source identification results. Today's existing three-dimensional arrays mainly include hemispherical microphone arrays, spherical microphone arrays, multi-layer three-dimensional grid arrays, and star arrays. Among them, the spherical microphone array is suitable for internal sound field measurement and has high complexity. The advantage of the multi-layer three-dimensional grid array is that it...

AI Technical Summary

Problems solved by technology

[0003] The limitations of existing beamforming methods and sound source localization techniques applied to three-dimensional sound source identification and localization are as follows: (1) The interval between adjacent microphones and the distance between adjacent two layers in the design of multi-layer three-dimensional grid array The spacing is the same, resulting in a constant inclination of the quadrangular pyramid surface, that is, the analysis frequency range remains unchanged

(2) It is impossible to effectively distinguish whether the sound source is located on the front side or the rear side of the array, and it is easy to cause front and rear blur

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