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Method for obtaining still acoustic source acoustic field image by regular sound array and single video camera

A single camera, camera technology, applied in the direction of measurement devices, instruments, radio wave measurement systems, etc., can solve the problem that the position of the measured sound source cannot be displayed intuitively, and achieve the effect of simple and intuitive positioning analysis and accurate noise reduction work.

Inactive Publication Date: 2008-10-22
TSINGHUA UNIV
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Problems solved by technology

However, the use of array technology can only obtain the distribution map of the sound field characteristic function of the sound source under test, and the position of the sound source under test cannot be displayed intuitively

Method used

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  • Method for obtaining still acoustic source acoustic field image by regular sound array and single video camera
  • Method for obtaining still acoustic source acoustic field image by regular sound array and single video camera
  • Method for obtaining still acoustic source acoustic field image by regular sound array and single video camera

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Embodiment Construction

[0016] The method for acquiring a sound field image of a static sound source based on a regular sound array and a single camera proposed by the present invention will be described in detail below in conjunction with the accompanying drawings:

[0017] (1) As attached figure 1 As shown in the figure, a regular microphone array 3 is arranged at a distance D from the static sound source 1 under test. The circular array is used in the figure, and a camera 2 is arranged in the center of the regular microphone array. The value of D ranges from 2 to 6 Meter.

[0018] (2) Start the above-mentioned camera and microphone array. The camera acquires a frame of image of the sound source under test. After a set period of time, the operation of the microphone array is stopped, and the microphone array obtains the sound pressure signal of the sound source under test during this period. like figure 1 As shown, the signal front interface box 4 amplifies the sound pressure signal of the measur...

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Abstract

The invention relates to a method for using a regular acoustic array and a single camera to obtain images of a static sound source sound field, which belongs to the noise analysis and control technical field. At first, a microphone array and a camera are arranged; the microphone array obtains a sound pressure signal of a measured sound source, and the camera obtains an image of the measured sound source; the sound pressure signal is subject to the beam forming treatment to obtain a sound field feature function distribution map of the measured sound source, and the sound field feature function distribution map and the image of the measured sound source are superimposed in a space coordinate. The method makes the position analysis of the static sound source simpler and more intuitive, and provides a more accurate evidence for further noise-reducing work.

Description

technical field [0001] The invention relates to a method for acquiring a sound field image of a static sound source by using a regular sound array and a single camera, and belongs to the technical field of noise analysis and control. Background technique [0002] Noise in modern society has become a major source of environmental pollution. In order to deal with the noise in a targeted manner, it is first necessary to obtain the sound field of the noise source more accurately, and distinguish each sound source. The visualization of the sound field can make the location and analysis of the noise source more intuitive, thus providing a basis for further noise control work, which is of great significance to noise measurement and control work. [0003] At present, the world's main acoustic holography methods and array methods are used to measure and analyze the sound field of moving sound sources in vehicles. The measurement of motion sound field by holography is greatly affect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S5/00G01S5/18
Inventor 杨殿阁连小珉罗禹贡郑四发李克强李兵邵林袁艺
Owner TSINGHUA UNIV
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