A Method for Identifying Sound Sources Using Single Microphone Movement Combined with Inner Product Operation

A microphone and a single technology, applied in the direction of beacon systems using ultrasonic/sonic/infrasonic waves, etc., can solve the problem of low measurement cost and achieve high resolution and low cost

Active Publication Date: 2020-03-31
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the existing problems of using microphone arrays to identify sound sources, and propose a method for identifying sound sources using a single microphone movement combined with inner product calculations, which does not require phase matching and has low measurement costs

Method used

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  • A Method for Identifying Sound Sources Using Single Microphone Movement Combined with Inner Product Operation
  • A Method for Identifying Sound Sources Using Single Microphone Movement Combined with Inner Product Operation
  • A Method for Identifying Sound Sources Using Single Microphone Movement Combined with Inner Product Operation

Examples

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Embodiment 1

[0059] There is a point sound source in a plane, and the frequency of the radiated sound wave of the point sound source is 1000Hz. Assume that the position coordinates of the point sound source are (0.4226,0.3113), and the coordinate unit is meter, such as figure 1 As shown, the recognition accuracy is required to reach the millimeter level. The identification steps are as follows:

[0060] (1) Detection of sound source frequency

[0061] Place the microphone at a point outside the plane, and take AO=0.5m away from the plane. First, the microphone is static, and the sound pressure signal is collected, and Fourier transform is applied to the collected signal to obtain the frequency f=1000Hz and period T=0.001s of the sound wave of the sound source.

[0062] (2) The microphone moves at a uniform speed to collect sound pressure signals

[0063] Let the microphone move in a straight line at a uniform speed along the X-axis, set the moving speed as v=1m / s, and collect a time-dom...

Embodiment 2

[0081] There is a sound source at a certain point in space, and the radiated sound wave frequency of the sound source is 800Hz. Assume that the coordinates of the sound source in the space are (0.2123, 0.3558, 0.7912), and the coordinate unit is meter, such as figure 2 As shown, the recognition requirement reaches the millimeter level. The identification steps are as follows:

[0082] (1) Detection of sound source frequency

[0083] The initial position of the microphone is taken as (0.5, 0, 0), and the distance from the area where the sound source is located is AO=0.6m. First, the microphone is static, and the sound pressure signal is collected, and Fourier transform is applied to the collected signal to obtain the frequency f=800Hz and period T=0.00125s of the sound wave of the sound source.

[0084] (2) The microphone moves at a uniform speed to collect sound pressure signals

[0085] Let the microphone move at a constant speed along the set circular track on the plane ...

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Abstract

The invention discloses a method for identifying a sound source by combining a single microphone with inner product operation in the technical field of sound source identification, and a microphone isused for identifying the sound source, a sound pressure signal is collected in the moving process, and due to the fact that the phase information of the actual point sound source cannot be determined, and the acquired signals are not related to each other in the time domain, so that the correlation is found in the frequency domain of the signals by adopting a whole period of sampling, and then the position of the actual point sound source is identified by using the inner product operation; compared with a microphone array, phase matching does not exist, and the cost is low; the high-medium-high-frequency sound sources are high in identification resolution, and space aliasing cannot be generated.

Description

technical field [0001] The invention relates to a sound source identification technology, in particular to a method for identifying a sound source by moving a single microphone to obtain the position of the sound source. Background technique [0002] Sound source identification is one of the important contents of noise control engineering, and has important applications in low-noise design of products and acoustic fault diagnosis. The location of the sound source can be obtained through sound source identification, and then information such as the intensity of the sound source can be obtained. Reducing noise from the sound source link is an effective way to control noise; by analyzing the sound signal to obtain information about the operation of mechanical equipment, it is possible to detect faults in time and avoid them. loss. [0003] The current sound source identification methods mainly include near-field acoustic holography and beamforming methods. These methods all us...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S1/76
CPCG01S1/76
Inventor 赵晓丹张涵时海涛董非
Owner JIANGSU UNIV
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