采用DFT滤波器组的声音回波对消器性能分析

Analysis of the Performance of an acoustic echo canceller using the DFT filterbanks

本文详细分析了采用DFT滤波器组的声音回波对消器的结构和性能。确切地给出了具有简化的重迭──相加结构的DFT分析／综合滤波器组的线性特性和延迟特性．分析并推导了在运算量最小准则下．对消器的最佳通道数K的计算；最后给出了对消器的计算机仿真结果。

In This paper the structure and the performance of an acoustic echo canceller using the DFT filterhanks are analysed. The linear phase and the delay of the analysis /synthesis DFT tllterbanks with the simplified weighted overlap-addstructure are given exactly. On the basis of the minimum total number of multiplication, the optimum channel number of the canceller is derived. The convergence properties are simulated by computer.