• Title/Summary/Keyword: Stereo acoustic echo canceller

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Performance Improvement of Stereo Acoustic Echo Canceller Using MINT Filtering (MINT 필터링에 의한 스테레오 음향 반향 제거기의 성능 향상)

  • 차경환
    • The Journal of the Acoustical Society of Korea
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    • v.21 no.1
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    • pp.42-46
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    • 2002
  • In this paper, a new pre-processing algorithm is proposed to improve the performance of stereo acoustic echo canceller. The proposed algorithm has the improved performance by the estimation error reduction of filter coefficient using input signal which was reduced reverberation of room in the basis MINT (Mu1tip1e-input/output Inverse Theorem) filtering. For real stereo speech signal and real room impulse response the results of simulation, we showed that the proposed method could improved 3∼5 dB ERLE (Echo Return Loss Enhancement) regardless of NLMS (Normalized Least Mean Square) and Projection adaptive algorithm.

Stereo Acoustic Echo Canceller Using Difference Components of Channel Signals (채널 신호의 차성분을 이용한 스테레오 음향 반향 제거기)

  • Kim Hyun Tae;Park Jang Sik;Son Kyung Sik
    • Proceedings of the Acoustical Society of Korea Conference
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    • pp.119-122
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    • 1999
  • In stereo acoustic echo canceller scheme, adaptive filters coefficients converge very slowly or misconverge to real acoustic echo path in receiving room. This is due to cross-correlation between channel signals. In this paper, new preprocessor using absolute difference factor between stereo signals is proposed to reduce cross-correlation between signals. Computer simulations demonstrate that this preprocessor perform well to the half wave rectifier which has simple and good performance of the several preprocessors in recent papers. When the paths in transmitting room change, performance does not degrade in proposed preprocessor.

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Performance Improvement of Stereo Acoustic Echo Canceler Using Gram-Schmidt Orthogonality Principle (그람-슈미트 (Gram-Schmidt) 직교원리를 이용한 스테레오 음향 반향 제거기의 성능향상)

  • 김현태;박장식;손경식
    • The Journal of the Acoustical Society of Korea
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    • v.20 no.5
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    • pp.28-34
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    • 2001
  • In stereo acoustic echo canceller scheme, coefficients of adaptive filter converge very slowly or misconverge to real acoustic echo path in receiving room. This is due to cross-correlation in stereo signals. In this paper, a new preprocess algorithm is proposed to improve the performance of stereo AEC(acoustic echo canceller) without computational burden. The proposed algorithm reduces cross-correlation using Gram-Schmidt orthogonality principles and nonlinear filtering. Computer simulations demonstrate that this algorithm performs well compared to conventional ones. When the acoustic path of transmitting room is changed, stereo AEC using proposed algorithm is well performed.

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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;정일규;손경식;김현태
    • The Journal of the Acoustical Society of Korea
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    • v.21 no.3
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    • pp.264-273
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    • 2002
  • 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.

A Simplified Orthogonal Projection Algorithm for Stereo Acoustic Echo Cancellation (스테레오 음향반향제거를 위한 간략화된 직교투사 알고리즘)

  • Lee, Haeng-Woo
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.16 no.11
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    • pp.2388-2396
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    • 2012
  • This paper is on an simplified orthogonal projection method which cancel the acoustic echo signals in the stereo acoustic echo canceller. Comparing with the NLMS algorithm which is widely used for simplicity and stability, it shows that this method has the improvement of the convergence performances for signals with the high auto-correlation, and has small computational quantities. To verify the convergence characteristics of the proposed algorithm, we simulated about various input signals. And we compared the results of simulation for this algorithm with the ones for the NLMS algorithm. By these works, it was proved that the stereo acoustic echo canceller adopting the proposed algorithm shows about 3dB more high ERLE than the NLMS algorithm for the white noise signals, and 5dB for the colored voice signals.

Performance Improvement of Stereo Acoustic Echo Canceler using the Difference of Stereo Signals (스테레오 신호의 차성분을 이용한 스테레오 음향 반향 제거기의 성능 향상)

  • 김현태;박장식;손경식
    • Journal of Korea Multimedia Society
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    • v.3 no.6
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    • pp.604-610
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    • 2000
  • A stereo acoustic echo canceller has significant cross-correlation between each channel signal. As the result, the adaptive filter coefficient that estimates the acoustic echo path of a receiving room can misconverge to the path or converge slowly. In this paper, a new preprocessor using absolute difference in stereo signals is proposed to reduce cross-correlations and to improve the removal efficiency of the stereo acoustic echo. Compared to the previous preprocessor using a half wave rectifier, the newly proposed preprocessor showed better performance according to computer simulation. In addition, when the paths of transmitting room were changed the performance of the proposed preprocessor was not degraded.

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