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Improved frequency domain srp sound source azimuth estimation method

A sound source orientation and sound source technology, applied in positioning, instruments, measuring devices, etc., can solve problems such as aliasing, sound source orientation deviation to the end-fire direction, etc., and achieve the effect of reducing the amount of calculation

Active Publication Date: 2020-04-24
BEIJING UNISOUND INFORMATION TECH
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Problems solved by technology

However, when the SRP method calculates the signal power spectrum, the high frequency part is prone to aliasing. Because the high frequency is prone to aliasing, even in a quiet environment, there is a problem that the sound source direction estimation deviates from the end-fire direction.

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  • Improved frequency domain srp sound source azimuth estimation method

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Embodiment Construction

[0041] The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0042] figure 1 It is a flowchart of an improved frequency-domain SRP sound source orientation estimation method in an embodiment of the present invention, such as figure 1 shown, including steps:

[0043] Step S101, the microphone array collects the time-domain signal of the sound source, and performs spectrum conversion on the time-domain signal to obtain the frequency-domain signal of the sound source;

[0044] Step S102, using the low-frequency part of the sound source frequency domain signal to obtain the first estimated area of ​​the sound source from the sound source space through the SRP sound source orientation estimation method;

[0045] Step S103, using...

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Abstract

The invention discloses an improved frequency domain SRP sound source orientation estimation method. The method comprises steps that a time domain signal of a sound source is acquired through a microphone array, and frequency spectrum transformation of the time domain signal is carried out to acquire a sound source frequency domain signal; the low frequency portion of the sound source frequency domain signal is utilized to acquire a first estimation region of the sound source from the sound source space through the SRP sound source orientation estimation method; the high frequency portion of the sound source frequency domain signal is utilized to acquire a second estimation region of the sound source from the first estimation region of the sound source through the SRP sound source orientation estimation method as the final estimation region of the sound source; for the acquired first estimation region of the sound source, time delay compensation of signals of a non-reference microphonein the microphone array is carried out through the SRP sound source orientation estimation method, and the region with the largest value of the controllable response power function is taken as the first estimation region of the sound source. The method is advantaged in that not only can a problem that sound source orientation estimation deviates to the end emission direction caused by easily-generated aliasing of the high frequency of the uniform linear array be solved, and computational complexity of the SRP algorithm can be substantially reduced.

Description

technical field [0001] The invention relates to the technical field of speech signal processing, in particular to an improved frequency-domain SRP sound source orientation estimation method. Background technique [0002] When estimating the azimuth of the sound source, the SRP (Steered Response Power) method is often used to estimate the power spectrum distribution in space, and the position with the highest power is found as the position of the sound source. However, when the SRP method calculates the signal power spectrum, the high frequency part is prone to aliasing. Due to the high frequency is prone to aliasing, even in a quiet environment, there is a problem that the sound source azimuth estimation deviates from the direction of the endfire. Contents of the invention [0003] In order to solve the above problems, the present invention provides an improved frequency-domain SRP sound source orientation estimation method, including: [0004] The microphone array collec...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S5/22
CPCG01S5/22
Inventor 丁少为关海欣马金龙
Owner BEIJING UNISOUND INFORMATION TECH