A stereo echo canceler with correct echo-path identification based on an input-sliding technique
A stereo echo canceler with correct echo-path identification based on an input-sliding technique
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基于输入滑动技术的具有正确回声路径识别的立体声回声消除器
DOI：
10.1109/78.960405
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发表时间：
1997
期刊：
影响因子：
--
通讯作者：
A. Hirano
中科院分区：
文献类型：
--
作者：
A. Sugiyama;Y. Joncour;A. Hirano
提出了一种基于输入滑动技术的具有正确回波路径识别的立体声回波消除器。位于两个通道之一的时变滤波器周期性地延迟输入信号。通过这种输入滑动，实现了正确的回波路径识别。通过选择适当的时变滤波器参数值，使输入滑动产生的混叠分量和可听咔哒声不可见。用NLMS算法和高斯白信号进行仿真，验证了回波路径识别的正确性。根据ITU-R五级损伤量表，带滑动的输入信号主观质量为4.38。基于32位浮点数字信号处理器实现的实验结果表明，远程房间的ERLE不受话务员变化的影响。对于不同的往返延迟，其平均意见得分比传统立体声回声消除器高出0.55分。
A new stereo echo canceler with correct echo-path identification based on an input-sliding technique is proposed. A time-varying filter located in one of the two channels periodically delays the input signal. By this input sliding, the correct echo-path identification is achieved. Aliasing components and audible clicks by input-sliding are made inaudible by selecting appropriate parameter values for the time-varying filter. Simulations with the NLMS algorithm and a white Gaussian signal confirm the correct echo-path identification. The subjective quality of the input signal with slides is 4.38 based on the ITU-R five-grade impairment scale. Experimental results based on an implementation by 32-bit floating-point digital signal processors show that ERLE is not degraded by talker changes in the remote room. The mean opinion score is as much as 0.55-point higher than the conventional stereo echo canceler for different round-trip delays.