降采样固定时延估算法在声回波对消系统中的应用

Sub-sampling in flat delay estimation with application to an acoustic echo cancellation system

提出一种基于降采样的固定时延估计算法,该算法在进行时延估计之前先对语音信号进行白噪声化和降采样,有效抑制互相关函数中的局部极大值旁瓣,克服了传统归一化互相关函数时延估计算法应用于声学回波对消系统中时估计误差大、鲁棒性差的问题;并以基于降采样的固定时延估算法为基础,设计实现声学回波抵消系统。计算机仿真结果证明:该算法运算量低、收敛速度快、性能稳定。

A sub-sampling flat delay estimation algorithm was proposed.The proposed algorithm performed speech signal whitening and desampling before the delay estimation.This arithmetic could effectively suppress the side lobe of the generalized cross-correlation function and could overcome the robust problem in the conventional time delay estimation algorithm based on the generalized cross-correlation function.Finally,an acoustic echo cancellation system was designed with the proposed flat delay estimation module.Computer simulation showed that the proposed algorithm performed better than the conventional one.