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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。
In this paper, a new multi-phase sub-band adaptive echo cancellation system is proposed. Adaptive filtering in the sub-band is particularly effective for impulse response with longer modeling length. At the same time, the affine projection algorithm has the function of pre-whitening, which also has the function of improving the convergence performance of the filter. The system focuses on the advantages of polyphase sub-band adaptive filtering and affine projection algorithm. Combined with the double-end detection algorithm in sub-band, the system can work stably and effectively under critical sampling. Experiments show that the system has good performance for both speech signal and strong correlation signal.