带有时变非线性预处理的立体声回波消除方法研究

就立体声回波消除问题提出了两种新的信号非线性预处理方法，并给出了相应的自适应算法。新的预处理方法比Benesty(1997)及Joncour(1998)的方法对信号的非线性处理部分要少，因而对语音信号的质量影响有所下降。仿真结果表明，新的预处理方法与其实现算法相结合应用于立体声回波消除时，比Benesty(1997)及Joncour(1998) 所提方法的效果更好。

Stereo Acoustic Echo Canceling Method with Time-Variable Nonlinear Pre-Processing

There are some problems such as no unique solution, large misalignment, and slow convergence in stereo acoustic echo cancellation caused by high correlation between stereo signals. Pre-processing signal to improve echo path identify by adding two nonlinear pre-processing units to conventional stereo acoustic cancellation is one of solutions to overcome above problems. In this paper, two methods that pre-process input signal nonlinearly and time-variably and responsive adaptive filtering algorithms for stereo acoustic echo cancellation are proposed. As compared to the methods presented by Benesty (1997) and Joncour(1998), the new pre-processing methods have less affect in speech quality due to input signal little. Simulation in MATLAB shows that the methods have better performance than that of Benesty(1997) and Joncour(1998) when it is applied to stereo acoustic echo cancellation.