Speech signal time delay estimation method and system used for echo cancellation

Abstract

The invention discloses a speech signal time delay estimation method and system used for echo cancellation. The method comprises the following steps of respectively obtaining a far-end signal and a near-end signal of a voice signal received by a microphone in a call and generating a corresponding far-end frequency domain signal and a corresponding near-end frequency domain signal; adopting a critical band based on the auditory masking effect to respectively carry out sub-band decomposition in the frequency band on the far-end frequency domain signal and the near-end frequency domain signal and obtaining a power spectrum of each critical frequency point of the far-end frequency domain signal and a power spectrum of each critical frequency point of the near-end frequency domain signal; respectively extracting local binary features of the power spectrum of each critical frequency point of the far-end frequency domain signal and the power spectrum of each critical frequency point of the near-end frequency domain signal, respectively matching and generating and outputting a time delay estimation result. According to the method and the system, the correlation between the far-end signal and the near-end signal is counted based on the auditory masking effect, the computation is simple, and the accurate time delay estimation can be obtained to bring great convenience for echo cancellation.

Description

Technical field [0001] The present invention relates to the technical field of digital speech processing, in particular to a method and system for estimating the time delay of a speech signal for echo cancellation. Background technique [0002] With the popularization of the Internet, the improvement of the level of home intelligence, and the widespread application of mobile smart terminals, Internet telephony has become a common communication method for people. Echo cancellation is a problem that must be solved in the application process of common telephone and VoIP. [0003] Echo is divided into acoustic echo and line echo. Line echo is caused by matching coupling between lines. Acoustic echo is caused by the sound of the loudspeaker being fed back to the microphone multiple times in the external voice call system. Acoustic echo cancellation is to eliminate the sound from the speaker from the voice received by the microphone to obtain the near-end voice after the echo is elimina...

AI Technical Summary

Problems solved by technology

[0007] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a voice signal delay estimation method and system for echo cancellation, aiming at solving the poor effect of the algorithm in the prior art on the delay estimation of the echo by the user during the conversation. , the defect of poor echo cancellation effect

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