International Workshop on Hands-Free Speech Communication (HSC2001) April 9-11, 2001 Kyoto, Japan

Performance Improvement of Stereophonic Acoustic Echo Canceller Using Non-Linear Pre-Processing

Young Ho Lee (1), Jang Sik Park (2), Kyung Sik Son (1), and Chung Ho Lee (3)

(1) Department of Electronics Eng., Pusan National University, Korea
(2) Department of Visual Technologies, Dongeul Institute of Technology, Korea
(3) Dept. oflntemet Images, Pusan Women's College, Korea

A stereophonic acoustic echo canceller cannot exactly estimate the echo path of the receiving room, because of the cross-correlation betwveen stereo signals. In this paper, the new preprocessing filter is proposed to reduce the cross-correlation between the signals without affecting stereo perception. The procedure is that two signals from the new orthogonal process are linearly decorrelated and the attenuated absolute values of the decorrelated signals are added to each channel input signal. As a result of computer simulation, it is shown that the performance of the proposed stereophonic acoustic echo canceller is better than that of conventional ones.

Full Paper

Bibliographic reference.  Lee, Young Ho / Park, Jang Sik / Son, Kyung Sik / Lee, Chung Ho (2001): "Performance improvement of stereophonic acoustic echo canceller using non-linear pre-processing", In HSC2001, 75-78.