一种改进的与声码器结合的声学回声消除器

An Improved Acoustic Echo Canceller Combined with LPC-Based Speech Coder

提出了一种改进的与线性预测声码器结合的声学回声消除器,通过增加一个自适应辅助滤波器,避免了对信号路径中所有信号在任何时刻都需经去相关、恢复相关过程所带来的信号质量降低、失调误差增加等负面影响。计算机仿真结果表明,该结构明显提高了已有算法的回声抵消量。

An improved acoustic echo canceller combined with the LPC-based speech coder based on the previous researching results is presented. By adding an auxiliary adaptive filter, the negative effects caused by the decorrelation filter and its inverse are avoided in the signal path. Computer simulations show this algorithm has a higher echo return loss enhancement value compared with the previous results.