Journal of South China University of Technology (Natural Science Edition) ›› 2006, Vol. 34 ›› Issue (9): 18-21.

• Electronics, Communication & Automation Technology • Previous Articles     Next Articles

Algorithm of Multi-Channel Echo Cancellation by Means of Nonlinear Pre-processing

Wang Jie  Xie Sheng-li   

  1. School of Electronic and Information Engineering,South China Univ.ofTech.,Guangzhou 510640,Guangdong,China
  • Received:2006-01-18 Online:2006-09-25 Published:2006-09-25
  • Contact: 王杰(1979-)，女，博士后，主要从事自适应信号处理、多通路回波消除和信道盲均衡方面的研究． E-mail:pupwang@sohu.com
  • About author:王杰(1979-)，女，博士后，主要从事自适应信号处理、多通路回波消除和信道盲均衡方面的研究．
  • Supported by:

    国家自然科学基金资助项目(60505005)；国家杰出青年自然科学基金资助项目(603253l0)；广东省自然科学团队研究项目(04205783)；广东省自然科学基金资助项目(05103553，05006508)；科技部重大基础前期研究专项(2005CCA04100)

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Abstract:

In the multi-channel echo cancellation.the nonlinear pre-processing is always used to overcome the nonconvergence of the filter caused by the strong correlation of input signals.How to choose a suitable nonlinear transformation coefficient is important to the assurance of acoustic quality and the cancellation of signal corelation. In order to solve this problem,this paper proposes a fuzzy logic-based method with little calculation increment to adjust the nonlinear transformation coeficient(α)that reasonably changes with the corelation of input signals,by which the communication quality can be effectively assured and the convergence of the filter can be greatly accelerated.The feasibility and superiority of the proposed method is verified by simulated results.

Key words: multi-channel echo cancellation, nonlinear pre-processing, fuzzy control, adaptive filtering