抗噪立体声回波对消算法研究

针对立体声回波对消器性能易受外部突发干扰影响的实际问题，提出一种干扰信号检测加最优滤波控制的抗噪方法，大大提高了回波对消器的抗干扰能力。结合已提出的解决立体声回波对消器失配问题的频移非线性预处理法，采用真实语音进行了复杂环境下的立体声回波对消仿真实验，结果表明该抗噪立体声回波对消算法改善失配和回声衰减增益显著，抗干扰能力强，各方面的性能指标均优于传统结构的回波对消器。

Study on Interference-free Stereophonic Acoustic Echo Cancellation Algorithm

In order to solve misalignment problem in stereophonic acoustic echo cancellation (SAEC), a nonlinear preprocessing solution based on frequency-shifting was proposed to reduce the correlation between the stereo signals and improve misalignment. Because interference can seriously deteriorate adaptive filter performance in SAEC, the performance of adaptive filter under interference environment was improved by detecting interference and controlling the optimal filter. The computer simulations were implemented with this interference-free SAEC algorithm under complicated environment. The results showed that the algorithm has better performance when it is applied to stereo acoustic echo cancellation.