A Time Delay Estimation Method Applicable to Sound Source Localization

A time delay estimation and sound source localization technology, applied in positioning, instruments, measuring devices, etc., can solve problems such as difficult to reduce noise and reverberation

Active Publication Date: 2020-10-27
GUANGZHOU UNIVERSITY
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Problems solved by technology

[0004] The present invention provides a time delay estimation method suitable for sound source localization to solve the technical problem that it is difficult to reduce the influence of noise and reverberation in the prior art. The present invention can effectively reduce the The influence brought by noise and reverberation, so as to improve the adaptability to noise and the accuracy of delay estimation

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  • A Time Delay Estimation Method Applicable to Sound Source Localization
  • A Time Delay Estimation Method Applicable to Sound Source Localization
  • A Time Delay Estimation Method Applicable to Sound Source Localization

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[0039] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0040] See figure 1 , a preferred embodiment of the present invention provides a time delay estimation method suitable for sound source localization, including:

[0041] S1. Perform signal processing on the speech signal obtained by the two microphones to obtain the complex cepstrum of the minimum phase component;

[0042] In this embodiment, in order to achieve sound source localization, two microphones need to be used to respective...

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Abstract

The invention discloses a time delay estimation method suitable for sound source localization. The method comprises the following steps: carrying out signal processing on speech signals obtained by two microphones to obtain complex cepstrum of a minimum phase component; calculating frequency spectrum of the minimum phase component and full-pass component frequency spectrum of the signal accordingto the complex cepstrum of the minimum phase component; calculating improved all-pass component frequency spectrum according to magnitude of the frequency spectrum of the minimum phase component and the frequency spectrum of the full-pass component signal, and calculating an improved phase weighting function according to the improved all-pass component frequency spectrum; calculating cross-power spectrum according to the improved all-pass component frequency spectrum and the improved phase weighting function; and solving a cross-correlation function of the cross-power spectrum through a fast inverse Fourier transform method, and calculating delay time according to the cross-correlation function. The time delay estimation method can effectively reduce the influence caused by noise and reverberation under the reverberation and noise environment, thereby improving adaptability to the noise and accuracy of time delay estimation.

Description

technical field [0001] The invention relates to the technical field of sound source localization, in particular to a time delay estimation method suitable for sound source localization. Background technique [0002] In recent years, the sound source localization technology based on the microphone array has been widely used in various scenarios. The time delay and position information determined by the sound source localization technology are provided for various speech algorithms such as beamforming, speech enhancement, speech recognition, and blind signal separation. important information. The sound source localization technology based on time delay estimation has the advantages of low computational cost and fewer microphones, so it is widely used in various real-time processing environments. The localization method of sound source localization technology is divided into two steps. The first step is to estimate the time difference between the propagation of the sound wave ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S5/22
Inventor 张承云梁龙腾
Owner GUANGZHOU UNIVERSITY
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