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Phase difference measurement-based microphone array direction finding method

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: 2015-07-29
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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  • Phase difference measurement-based microphone array direction finding method
  • Phase difference measurement-based microphone array direction finding method
  • Phase difference measurement-based microphone array direction finding method

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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

Disclosed is a phase difference measurement-based microphone array direction finding method. The phase difference measurement-based microphone array direction finding method comprises the steps of obtaining the sampling data of a microphone array; performing fast Fourier transform on the sampling data of the microphone array according to channel sequence numbers to obtain the frequency domain data of the microphone array; selecting available frequency units; according to the available frequency units, computing corresponding array distance difference vectors; utilizing the array distance difference vectors of all the available frequency units to compose the high-dimensional linear system of equations of voice signal direction vectors, cooperatively solving the direction vector estimated values of voice source signals; according to the direction vector estimated values of the voice source signals, computing the azimuth angle estimated values and the pitch angle estimated values of the voice source signals. The phase difference measurement-based microphone array direction finding method has the advantages of being high in direction finding speed and precision, and particularly through the phase difference information of multiple available frequency units of the voice signals, obtains high azimuth angle and pitch angle estimating 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...

Claims

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Application Information

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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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