子带仿射投影及子带双端检测算法的回声消除系统

Subband Acoustic Echo Cancellation System Using Affine Projection Algorithm and Subband Double-talk Detection

文中提出了一种新的多相位子带自适应回声消除系统。在子带内进行自适应滤波对建模长度比较长的脉冲响应特别有效,同时由于仿射投影算法具有预白化的作用,它同样也具有改善滤波器收敛性能的功能。该系统集中了多相子带自适应滤波和仿射投影算法的优点,结合了子带内的双端检测算法,使得系统在临界采样的情况下能进行稳定有效的工作。实验表明:该系统对于语音信号和强相关信号都表现出了良好的性能。

This paper presents a new system for acoustic echo cancellation.Adaptive filtering in subbands is a technique for identification of large impulse response,and the convergence speed of the proposed algorithm is improved by the affine projection （AP） algorithm,due to that the AP algorithm could prewhiten the input signal.The system combines merits of the AP algorithm and the subband adaptive filtering.Moreover,by applying the polyphase decomposition and subband double-talk detection,the system could work effectively.Experiment indicates that the proposed algorithm performs well for the colored signal and speech signal.