The Journal of the Acoustical Society of Korea (한국음향학회지)

The Acoustical Society of Korea (한국음향학회)
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Performance Improvement of Stereophonic Acoustic Echo Canceler Using Non-linear Pre-processing Filter

비선형 전처리필터를 이용한 스테레오 음향 반향 제거기의 성능향상

  • 박장식 (동의공업대학 영상정보과) ;
  • 정일규 (부산대학교 전자공학과) ;
  • 손경식 (부산대학교 전자공학과) ;
  • 김현태 (동의대학교 컴퓨터영상공학부)
  • Published : 2002.04.01
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Abstract

Adaptive filters cannot exactly estimate the echo path of the receiving room because of the cross-correlation of stereo signals. In this paper, a new pre-processing method reducing the cross-correlation without degradation of stereophony is proposed to enhance the performance of stereophonic acoustic echo canceller. To reduce the cross-correlation, absolutes of two orthogonal signals derived from each channel signals are added to original channel signals. Assuming that the power of each channel signal is larger than that of the cross-correlation, the computation of pre-processing can be reduced. As results of simulations, it is shown that the performance of stereo acoustic echo canceller with the proposed pre-processing method is better than that of conventional ones.

스테레오 신호간의 상호상관 때문에 일반적인 적응 필터는 수신실의 음향 반향 경로를 정확하게 추정하지 못한다. 본 논문에서는 스테레오 신호의 음질을 크게 저하시키지 않으면서 신호간의 상호상관을 줄여 스테레오 음향 반향 제거기의 성능을 향상시키는 새로운 전처리 방법을 제안한다. 상호 상관을 줄이기 위하여 각 채널 신호로부터 서로 직교하는 두 신호를 구하고 그 절대값을 원신호에 더한다. 각 채널 신호의 전력이 두 채널 신호의 상호상관도보다 크다는 가정을 활용하여 서로 직교하는 신호를 구하기 위한 계산량을 감소시켰다. 시뮬레이션을 통하여 제안하는 전처리 방법을 채용한 스테레오 음향 반향 제거기의 성능이 기존의 방법보다 우수함을 보인다.

Keywords

References

  1. IEEE Signal Processing Letters v.2 no.8 Stereophonic acoustic echo cancellation-an overview of the fundamental problem M.M. Sondhi;D.R. Morgan;J.L. Hall https://doi.org/10.1109/97.404129
  2. International Conference on Acoustics, Speech and Signal Processing 98 Stereophonic Acoustic echo cancellation system using time-varying all-pass filtering for signal decorrelation Murtaza Ali
  3. IEEE Workshop on Appli-cations of Signal Processing to Audio and Acoustics Acoustic echo cancellation for stereophonic teleconferencing M.M. Sondhi;D.R. Morgan
  4. International Conference on Acoustics, Speech and Signal Processing 95, Detroit Michigan Stereo projection echo canceller with true echo path estimation S. Shimauchi;S. Makino
  5. International Conference on Acoustics, Speech and Signal Processing 97, Monich Germany A better understanding and an improved solution to the problems of stereophonic acoustic echo cancellation J. Benesty;D.R. Morgan;M.M. Sondhi
  6. International Conference on Acoustic, Speech and Signal Processing 98, Seattle Washington Influence of audio coding on stereophonic acoustic echo cancellation T. Gansler;P. Eneroth
  7. IEEE Signal Processing Letters v.3 no.2 A multichannel affine projection algorithm with applications to multichannel acoustic echo cancellation J. Benesty;P. Duhamel;Y. Grenier https://doi.org/10.1109/97.484209
  8. Proc. International Conference on Acoustics, Speech and Signal Processing 2001, Salt Lake STFT-based multichannel acoustic interference suppressor Carlosr Avendano;Guillermo Garcia
  9. Proc. International Conference on Acoustics, Speech and Signal Processing, Salt Lake An acoustic echo cancellation structure for synthetic surround sound T. Yensen;R.Goubran
  10. 한국음향학회지 v.18 no.5 스테레오 음향 반향 제거기를 위한 적응 필터링 알고리즘 김은숙;정양원;박영철;윤대희
  11. 한국음향학회지 v.20 no.5 그람-슈미트 직교원리를 이용한 스테레오 음향반향제거기의 성능향상 김현태;박장식;손경식
  12. IEEE Signal Processing Magazine The past, present, and future of audio signal processing-acoustic echo cancellation S. Makino
  13. Electron. Comm. Japan v.J67-A no.2 An adaptive filtering algorithm using an orthogonal projection to an affine subspace and its property K. Ozeki;T. Umeda
  14. Proc. International Conference on Acoustics, Speech and Signal Processing 95 The fast affine projection algorithm S.L. Gay;S. Tavathia
  15. Proc. Inter-national conference on Acoustics, Speech and signal Pro-cessing 95 Fast projection algorithm and its step size control M. Tanaka;Y. Kaneda;S. Makino;J. Kojima
  16. Proc. International Conference on Acoustics, Speech and Siganal Processing 96 SSB subband echo canceller using low-Order projection algorithm S. Makino;J. Noebauer;Y. Haneda;A. Nakagawa
  17. International Conference on Acoustics, Speech and Signal Processing 96, Atlanta Georgia Analysis of two structure for combined acoustic echo cancellation and noise reduction Y. Gueiou;Abdelkrim Benamar;Pascal Scalart
  18. Fundamentals of Speech Recognition (Section 4.5) L. Rabiner;B.H. Juang