Microphone Array Direction Finding Method Based on Phase Difference Measurement

A technology of microphone array and phase difference, which is applied in the field of signal processing and can solve problems such as complex implementation

Active Publication Date: 2018-04-17
XIDIAN UNIV
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Problems solved by technology

[0003] For speech signals, due to its wide-band characteristics, the implementation of traditional direction-of-arrival estimation methods based on spatial spectrum estimation is relatively complicated.

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  • Microphone Array Direction Finding Method Based on Phase Difference Measurement
  • Microphone Array Direction Finding Method Based on Phase Difference Measurement
  • Microphone Array Direction Finding Method Based on Phase Difference Measurement

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Embodiment Construction

[0045] 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.

[0046] The purpose of the method of the present invention is to improve the real-time performance and accuracy of the direction finding of the microphone array, especially when the number of array elements of the microphone array is large and there are many available frequency units, it has a higher direction finding performance. The basic idea is: first read Take the microphone array data frame, then select the available frequency units, and finally combine the array distance difference vectors corresponding to all available frequency units to solve the direction vector of the speech signal, and estimate the azimuth and elevation angle of the speech signal.

[0047] The above is the core idea of ​​the presen...

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Abstract

The microphone array direction finding method based on phase difference measurement, the steps are as follows: obtain the sampling data of the microphone array; perform fast Fourier transformation on the sampling data of the microphone array according to the channel number to obtain the frequency domain data of the microphone array; select the available frequency unit; according to the available frequency unit, calculate the corresponding array distance difference vector; use the array distance difference vector of all available frequency units to form a high-dimensional linear equation group of the voice signal direction vector, and jointly solve the direction vector estimation value of the sound source signal; An estimated value of the azimuth angle and an estimated value of the elevation angle of the sound source signal are calculated based on the estimated value of the direction vector of the sound source signal. The method of the invention has the characteristics of fast direction finding speed and high precision, and especially utilizes the phase difference information of a plurality of available frequency units of the speech signal, and has high azimuth angle and elevation angle estimation performance.

Description

technical field [0001] The invention belongs to the technical field of signal processing, and in particular relates to a method for measuring the azimuth and elevation angle of voice signals based on a microphone array, which is used to solve the problem of real-time direction finding of broadband voice signals, and can be applied to communications or radar based on array antennas Realize radiation source direction finding and other fields. Background technique [0002] A microphone array is a sound signal acquisition device composed of a group of microphones placed in a specific position. According to practical applications, the microphone array signal processing mainly solves the problem of extracting useful signals from the output results of the array or for parameter estimation. As an important research content of speech signal processing, microphone array direction finding has been widely concerned. [0003] For the voice signal, due to its wide-band characteristics, t...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04R29/00
Inventor 刘聪锋杨洁张煜朱燕李平王兰美
Owner XIDIAN UNIV
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