A robust time-delay estimation and dereverberation algorithm based on the coherence function

FANG Yi; CHEN Youyuan; MOU Hongyu; FENG Haihong

doi:10.16511/j.cnki.qhdxxb.2018.25.026

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Journal of Tsinghua University(Science and Technology) ›› 2018, Vol. 58 ›› Issue (5) : 516-522. DOI: 10.16511/j.cnki.qhdxxb.2018.25.026

COMPUTER SCIENCE AND TECHNOLOGY

A robust time-delay estimation and dereverberation algorithm based on the coherence function

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Abstract

The performance of traditional cross-correlation based time-delay estimation methods is sharply degraded in reverberation environments. Precedence effect models have been proposed with cross-correlation functions, but these models are quite parameter-sensitive and the front-end processes are very complex. This paper describes a method that first updates a function of the speech and noise based on the eigenvalues of the covariance matrix. Then, a coherence function of the speech is matched to the ideal coherence function for the time-delay estimate. Then, the estimated time delay and the noise coherence function are applied to the coherent-to-diffuse power ratio (CDR) estimator for reverberation suppression. Tests show that this scheme has higher localization accuracy than traditional methods and achieves higher PESQ (perceptual evaluation of speech quality) scores than other CDR estimators.

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precedence effect / time-delay estimation / dereverberation / coherence function

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FANG Yi, CHEN Youyuan, MOU Hongyu, FENG Haihong. A robust time-delay estimation and dereverberation algorithm based on the coherence function[J]. Journal of Tsinghua University(Science and Technology). 2018, 58(5): 516-522 https://doi.org/10.16511/j.cnki.qhdxxb.2018.25.026

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