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Acoustic imaging method

An imaging method and acoustic technology, applied in speech analysis, instruments, etc., can solve problems such as large computing power and inability to adjust, and achieve the effect of reducing computing power pressure, reducing computing power, and ensuring resolution

Active Publication Date: 2020-12-01
杭州兆华电子股份有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

[0003] The present invention solves the problem that general noise detection requires a relatively large computing power and cannot be adjusted to adapt to systems with different computing power conditions, and provides an acoustic imaging method

Method used

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Embodiment

[0036] Embodiment: a kind of acoustic imaging method of this embodiment, such as Figure 1~4 shown, including the following steps:

[0037] In step S1, the original audio data of N channels is first collected through a microphone.

[0038] Step S2, data processing is performed on the collected original audio data to obtain a sound source intensity distribution map.

[0039] Data processing includes the following steps:

[0040] S21: Carry out FFT calculation with a length of K on the original audio data of N channels, and obtain N channels of FFT data to form an N*K dimensional complex matrix X',

[0041]

[0042] Where e is a natural number, j is an imaginary unit, a is a real number, QUOTE represent a plural number;

[0043] The length K calculated by the FFT algorithm can be a variety of length specifications, which can be selected according to the actual processing capacity; when the FFT algorithm is used, a window function is required, and the window function ca...

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Abstract

The invention relates to an acoustic imaging method, which solves the problems that general noise detection needs large computing power and cannot be adjusted to adapt to systems with different computing power conditions. The method comprises the following steps of: acquiring original audio data through a microphone; performing data processing on the original audio data to obtain a sound source intensity distribution diagram; collecting image information through a camera; and fusing the sound source intensity distribution diagram with the image information to obtain an acoustic imaging picture. The beneficial effects of the invention are that: the method achieves the visualization and materialization of the sound intensity through the combination of the sound source intensity distributiondiagram and the photographed image; a correction matrix is adopted to calibrate and correct the calculation deviation of the sound source intensity distribution matrix, and unnecessary interference iseliminated, so that the result is more precise; high-power interpolation processing is carried out after FFT processing, so that the computing power pressure is reduced, and meanwhile, the resolutionratio is also ensured; the simplified and optimized process can also be realized by using a small and light carrier device, and can be suitable for more application scenes.

Description

technical field [0001] The invention relates to the field of acoustic imaging, in particular to an acoustic imaging method. Background technique [0002] With the continuous development of the industry, the requirements for the industrial production process are also increasing, especially in the relevant testing links. In many existing places, noise detection is used to judge the operation of related equipment, such as NVH and BSR noise detection in automobile production, and noise detection is used to judge gas leakage in some production environments. It can be seen that noise detection has important and broad application prospects in many related fields. However, the existing noise detection can only obtain the noise value of a certain place. If you want to know the change or division of the noise intensity, you need to detect it one by one through the instrument, which is very troublesome. At present, the calculation of noise intensity is not accurate enough, and improv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L21/14G10L21/18
CPCG10L21/14G10L21/18
Inventor 曹祖杨张凯强包君康崔二朋
Owner 杭州兆华电子股份有限公司
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