Sound source imaging method based on microphone array

A technology of microphone array and imaging method, which is applied in the direction of measuring devices, instruments, radio wave measurement systems, etc., can solve the problem that the positioning result of the sound source localization method is easily interfered by external factors, etc., so as to reduce the computing power of the algorithm, improve the computing efficiency, The effect of increasing the resolution

Pending Publication Date: 2021-07-27
HANGZHOU AIHUA INSTR
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AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is: the positioning result of the existing sound source localization method is easily disturbed by external factors

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  • Sound source imaging method based on microphone array
  • Sound source imaging method based on microphone array
  • Sound source imaging method based on microphone array

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Embodiment Construction

[0033] The specific embodiments of the present invention will be further specifically described below through specific embodiments in conjunction with the accompanying drawings.

[0034] Example Figure 1~2 shown, including the following steps:

[0035] Step S1: first design a multi-armed helical array with N channels;

[0036] Step S2: collecting original audio data through a multi-channel microphone;

[0037] Step S3: Correct the original audio data; obtain the correction value by calculating the cross-correlation estimation of each channel in the far-field signal, the formula is as follows:

[0038]

[0039] Among them: x1 and x2 represent two signals that need to be estimated by cross-correlation respectively.

[0040] Step S4: Preprocessing the original audio data of the channel to obtain filtered data. The data preprocessing steps are as follows:

[0041] (1) The data length M of each channel, M is an integer power of 2, in order to ensure the accuracy of the ana...

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Abstract

The invention provides a sound source imaging method based on a microphone array, and the method comprises the following steps: S1, forming a multi-channel microphone array through a multi-arm spiral array, and enabling the number of channels to be N; S2, collecting original audio data of N channels through a microphone array; S3, performing phase correction on the original audio data; S4, processing the corrected audio data to obtain a complex matrix R '; S5, determining coordinates of each point on the scanning surface according to the coordinates of the microphone array; S6, calculating a guide vector from the scanning surface to the array surface, and obtaining a sound source intensity distribution diagram of the scanning surface according to the cross-spectrum matrix R; and S7, carrying out superposition processing on the sound source intensity distribution diagram and the video image to obtain a real-time acoustic imaging diagram. The problem that the positioning result of the existing sound source positioning method is easily interfered by external factors is solved through audio data correction and video superposition.

Description

technical field [0001] The invention relates to the field of acoustic imaging, in particular to a sound source imaging method based on a microphone array. Background technique [0002] With the continuous acceleration of the industrialization process, people's demand for equipment testing continues to increase. In industrial production, the location of noise sources has always been the focus of attention. Quick and accurate detection of sound source locations can improve equipment testing efficiency and reduce testing costs. [0003] In recent years, sound source localization technology based on microphone array has become a research hotspot in recent years. Sound source localization is to receive audio signals through multiple microphones and reflect the direction of the sound source after processing. Existing sound source localization products generally use a time delay estimation method for sound source localization, by calculating the delay of received signals between di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S5/22
CPCG01S5/22
Inventor 毛志德张凯帆张静韦俊东唐子凡张自立董芳汝
Owner HANGZHOU AIHUA INSTR
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