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A method of acoustic imaging

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

Active Publication Date: 2021-01-19
杭州兆华电子股份有限公司
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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, 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 can be a H...

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Abstract

The present invention relates to an acoustic imaging method, which solves the problem that general noise detection requires relatively large computing power and cannot be adjusted to adapt to systems with different computing power conditions. It includes the following steps: collecting original audio data through a microphone; The data is processed to obtain the sound source intensity distribution map; the image information is collected through the camera; the sound source intensity distribution map is fused with the image information to obtain the acoustic imaging picture. The beneficial effects of the present invention are: through the combination of the sound source intensity distribution map and the captured image, the sound intensity can be visualized and embodied; the correction matrix is ​​used to calibrate and correct the calculation deviation of the sound source intensity distribution matrix, and unnecessary interference is eliminated to make the result more accurate ;Put the high-magnification interpolation processing after the FFT processing, which reduces the pressure on computing power and ensures the resolution; the streamlined and optimized process can also be realized with a small and lightweight carrier device, which can be applied to more application scenarios.

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 Patents(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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