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Microphone array sound source positioning signal processing method

A microphone array, microphone signal technology, applied in positioning, measuring devices, instruments, etc., can solve problems such as drop, impact on positioning accuracy, and achieve the effect of improving accuracy and large response power value

Active Publication Date: 2019-01-11
INST OF ACOUSTICS CHINESE ACAD OF SCI
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the positioning accuracy of the SRP-PHAT method in the prior art is seriously affected by environmental noise and reverberation conditions and drops sharply

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  • Microphone array sound source positioning signal processing method
  • Microphone array sound source positioning signal processing method
  • Microphone array sound source positioning signal processing method

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Embodiment

[0052] Assuming that the microphone array composed of M microphones is distributed in three-dimensional space, the coordinates of each microphone are According to the estimation accuracy requirements of the system, all possible positions of the sound source can be simplified to the grid points of the three-dimensional grid in the measurement space. Suppose it is divided into Q grid points, and its coordinates are Each microphone corresponds to a channel, and the sampling frequency of the signal is f s , the sampling length of each channel per frame is L, denoted as x i1 (n), i1=1,...,M, n=1,...,L. The number of Fourier transform points is equal to 2L-1.

[0053] Such as figure 1 As shown, the specific steps of the signal processing method disclosed in the present invention are as follows:

[0054] Step 1) According to the microphone position coordinates and the search grid point coordinates, use formula (4) to calculate the delay difference from each grid point to the p...

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Abstract

The invention provides a microphone array sound source positioning method. The microphone array sound source positioning method comprises the steps that (1) an estimated sound source position is divided into Q grid points in a measurement space, the three-dimensional coordinate of each grid point is vector S<q>, wherein q is equal to 1, 2, ..., Q, M microphone signals are sampled, and the time delay difference of the grid point vector S<q> to every two different microphone signals is calculated; and (2) data, of the current frame, of M microphone channels are collected, time delay values of microphone pairs are calculated, the weighted value w<q> of the q grid point is calculated based on the time delay values and the time delay difference in the step (1), then the SRP-PHAT value p<q>of the q grid point is calculated, the grid point q<hat> corresponding to the maximum value of w<q>p<q> is found in the Q grid points, and thus the grid point coordinates vector Sq<hat>, corresponding to the estimated sound source position, of the data of the frame are obtained. The problems that in the prior art, the positioning accuracy of an SRP-PHAT method is seriously affected by environmental noise and reverberation conditions and then drastically decreased can be solved.

Description

technical field [0001] The invention belongs to the technical fields of audio signal processing and array signal processing, and in particular relates to a method for processing a microphone array sound source localization signal. Background technique [0002] At present, microphone array localization algorithms can be roughly divided into three categories, namely time difference of arrival (TDOA) localization, steerable response power (SRP) and high-resolution spectral estimation. Algorithms based on high-resolution spectral estimation were initially applied to the localization of narrow-band sources, and were gradually applied to the localization of broadband sources by many scholars. When expanding to wideband signal estimation, it is necessary to divide the signal frequency into multiple subbands in the frequency domain, or perform frequency focusing to convert it into a narrowband signal processing method. This type of algorithm has a high positioning resolution, but d...

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Application Information

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IPC IPC(8): G01S5/22
CPCG01S5/22
Inventor 孟晓辉理华肖灵
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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