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工程科学与技术:2007,39(1):140-145
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多路声回波对消中基于时基微扰的去互相关法的研究
(多路声回波对消中基于时基微扰的去互相关法的研究)
Research on De-cross-correlation Methods Based on Time Axis Perturbation in Multi-channel Acoustic Echo Cancellation
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投稿时间:2006-03-02    
中文摘要: 针对多通道声回波对消(MCAEC)中因多声道信号间存在强互相关性而导致的多路声回授通道辨识解的非唯一性问题(NUP),利用人耳听觉对语音信号相位失真不敏感这一事实,提出一种新的基于时基微扰(TPM)的去互相关预处理思路。重点探索了基于时基微扰的帧时移线性去相关法(TPM-FTS)和帧伸缩非线性去相关法(TPM-FEC)。分析及仿真实验结果表明,无论是TPM-FTS法还是TPM-FEC法,在信号音质下降限定于同一个听觉感知容忍度内时,其去相关能力均比常规的基于幅度微扰(APM)的各种非线性预处理去相关方法有
Abstract:a new de-cross-correlation preprocessing idea based on time axis perturbation method (TPM), which utilized the fact that hearing perception is not sensitive to the phase distortion of a speech signal, was proposed to solve the non-unique problem (NUP) in multi-channel acoustic echo cancellation (MCAEC). TPM-based frame time shifting (TPM-FTS) linear method and TPM-based frame expanding compressing (TPM-FEC) nonlinear method were mainly explored. Analysis and experiment showed that, under a condition of the same hearing allowance to the preprocessed speech outputs, both TPM-FTS method and TPM-FEC method have a much better de-cross-correlation performance in comparison with the conventional de-cross-correlation nonlinear preprocessing methods based on amplitude perturbation (APM). TPM-FEC has a more regular rule to follow for the decision of the values of its controlling parameters than TPM FTS, but TPM-FTS has a much easier operation for real-time implementation than TPM-FEC.
文章编号:20070128     中图分类号:    文献标志码:
基金项目:国家自然科学基金资助项目(60472096)
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何培宇,夏秀渝.多路声回波对消中基于时基微扰的去互相关法的研究[J].工程科学与技术,2007,39(1):140-145.
.Research on De-cross-correlation Methods Based on Time Axis Perturbation in Multi-channel Acoustic Echo Cancellation[J].Advanced Engineering Sciences,2007,39(1):140-145.