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A two-stage music microphone array direction finding method

A microphone array and direction finding technology, which is applied in the field of signal processing, can solve the problems of complex implementation and the processing performance depends on the focusing matrix, etc., and achieves the effect of small calculation amount, simple implementation method and fast direction finding speed.

Inactive Publication Date: 2017-03-08
XIDIAN UNIV
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AI Technical Summary

Problems solved by technology

The coherent subspace method not only needs to calculate the focusing transformation matrix, but also needs to select the reference frequency, so the implementation is relatively complicated, and its processing performance directly depends on the calculation of the focusing matrix
The aforementioned two methods still have deficiencies in solving the problem of real-time direction finding of multiple broadband voice signals

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  • A two-stage music microphone array direction finding method
  • A two-stage music microphone array direction finding method
  • A two-stage music microphone array direction finding method

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Embodiment Construction

[0051] In order to make the above and other objects, features and advantages of the present invention more apparent, the following specifically cites the embodiments of the present invention, together with the accompanying drawings, for a detailed description as follows.

[0052]The purpose of the method of the present invention is to improve the direction-finding performance of the microphone array to multi-speech signals, by selecting the frequency unit closest to the reference frequency to perform up to two levels of MUSIC spectrum estimation, wherein the frequency unit at the high-frequency end is used to ensure the angle estimation accuracy, low The frequency unit of the frequency band is used to solve the ambiguity of the angle estimation, and finally obtain the accurate angle estimation value of each speech signal.

[0053] The above is the core idea of ​​the present invention. The technical solutions of the embodiments of the present invention will be clearly and comple...

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Abstract

The invention discloses a two-stage MUSIC microphone array direction finding method. The method includes the steps that a microphone array which is composed of N array elements receives spatial far field sound source signals, and sampled data of the microphone array are acquired; the sampled data are segmented to acquire segmented microphone array data; frequency domain segmented array data are acquired; available frequency units are selected, so that an available frequency set is obtained; the reference frequency is determined when the angle of arrival is estimated; the two-stage MUSIC algorithm is used for calculating the angle of incidence of the sound source signals. According to the method, the advantages of the frequency units at different frequency bands in the angle estimating process are combined, the frequency unit which is closest to the reference frequency is selected to be subjected to two-stage MUSIC spectrum estimation at most, the frequency units at the high frequency stage are used for guaranteeing the angle estimating precision, the frequency units at the low frequency stage are used for solving the angle estimating blur, the angle estimating result at the low frequency stage is used for solving the angle blur at the high frequency stage, and therefore a high-precision angle estimating result can be acquired.

Description

technical field [0001] The invention belongs to the technical field of signal processing, and in particular relates to a method for measuring azimuth and elevation angles of multiple voice signals based on a microphone array. Background technique [0002] Microphone array direction finding is one of the main research contents of speech signal processing. Azimuth estimation of speech signals is widely used in video conferencing, sound source location and tracking, and speech signal enhancement. When there is only one voice source signal, the azimuth estimation is relatively simple, but when there are multiple voice sources at the same time, how to realize the angle estimation and tracking of the voice source is a more difficult problem. Because when multiple speech signals exist at the same time, each speech signal appears at different times and occupies different frequency bands, which are practical issues that must be considered in the direction finding of speech signals. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S3/80G10L21/0232
CPCG01S3/80G01S3/8003
Inventor 刘聪锋杨洁朱燕张煜李平王兰美
Owner XIDIAN UNIV
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