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Method for recognizing three-dimensional coordinates of sound sources via planar arrays

A planar array and three-dimensional coordinate technology, which is applied in the direction of measuring devices, instruments, radio wave measurement systems, etc., can solve the problems of being unable to accurately locate the real position and automatically give the distribution of sound sources, etc.

Active Publication Date: 2013-01-30
ZHEJIANG UNIV OF TECH
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention is applied to the identification and positioning of sound sources. The limitations of existing beamforming methods and technologies are: (1) It is necessary to manually provide the distance between the sensor array and the sound field search surface to determine the position of the sound source in the x and y directions , since the provided distance is the result of human estimation, it is impossible to accurately locate the real position of the previously unknown sound source in three-dimensional space; (2) The distribution of sound sources on complex objects and complex structural surfaces cannot be automatically given

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  • Method for recognizing three-dimensional coordinates of sound sources via planar arrays
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  • Method for recognizing three-dimensional coordinates of sound sources via planar arrays

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[0033] specific implementation plan

[0034] The present invention will be further described below through specific implementation examples.

[0035] In this implementation example, the spoke array is selected as the measurement array to figure 1 60 microphones are arranged in an irregular manner as shown, the spacing between the microphones is not equal, and the working frequency band is 0.5-8kHz.

[0036] Suppose the sound source is a point sound source, located at (-0.5m, 0.5m, 0.8m), the background noise is not considered for the time being, the sound source frequency is 4kHz, and the sound source intensity is 1Pa. The search area of ​​interest is a cuboid, whose center is located at the coordinate origin O, the X and Y axes are searched from -2m to 2m, the Z axis is searched from 0m to 3m, and the search step is 0.02m. The planar array is located in the x, y coordinate plane, and the center of the array surface is located at the coordinate origin.

[0037] According to...

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Abstract

The invention provides a method for recognizing three-dimensional coordinates of sound sources via planar arrays. The method comprises the steps of carrying out planar sound field reconstruction at different distances by taking meshed mesh points of a three-dimensional space as reconstruction points via a beam forming method on the basis of a spherical wave sound field model, comparing the output values of beam formers on different reconstruction surfaces along the distance direction (Z direction), and determining the Z-axis coordinate corresponding to the maximum output value as the distance of the sound sources. The method provided by the invention has the advantages of being applied to the two-dimensional arrays, recognizing the three-dimensional coordinates of the sound sources and being directly applied to the existing planar array acoustical holography equipment which is only capable of recognizing the two-dimensional coordinates of the sound sources; and the effectiveness and the reliability of the method are proved by tests.

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 beam forming method for identifying three-dimensional coordinates of a sound source by using a plane array. Background technique [0002] Accurate identification and positioning of noise sources in complex systems such as aircraft, high-speed rail, ships, and automobiles is a prerequisite for effective noise reduction. In recent years, the use of sensor arrays to accurately identify and locate noise sources is an important technology. At present, the commonly used sound source identification and localization methods include the near-field acoustic holography method and the beamforming method. The near-field acoustic holography method has a higher spatial resolution for low- and medium-frequency sound sources, especially for structural noise sources....

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Application Information

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IPC IPC(8): G01S5/20
Inventor 卢奂采李春晓金江明丁浩梅东挺
Owner ZHEJIANG UNIV OF TECH
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