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Echo Cancellation - A Likelihood Ratio Test for Double-talk Versus Channel Change

Bershad, Neil J. and Tourneret, Jean-Yves Echo Cancellation - A Likelihood Ratio Test for Double-talk Versus Channel Change. (2006) IEEE Transactions on Signal Processing, vol. 5 (n° 12). pp. 4572-4581. ISSN 1053-587X

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Official URL: http://dx.doi.org/10.1109/TSP.2006.881222

Abstract

Echo cancellers are in wide use in both electrical (four wire to two wire mismatch) and acoustic (speaker-microphone coupling) applications. One of the main design problems is the control logic for adaptation. Basically, the algorithm weights should be frozen in the presence of double-talk and adapt quickly in the absence of double-talk. The control logic can be quite complicated since it is often not easy to discriminate between the echo signal and the near-end speaker. This paper derives a log likelihood ratio test (LRT) for deciding between double-talk (freeze weights) and a channel change (adapt quickly) using a stationary Gaussian stochastic input signal model. The probability density function of a sufficient statistic under each hypothesis is obtained and the performance of the test is evaluated as a function of the system parameters. The receiver operating characteristics (ROCs) indicate that it is difficult to correctly decide between double-talk and a channel change based upon a single look. However, post-detection integration of approximately one hundred sufficient statistic samples yields a detection probability close to unity (0.99) with a small false alarm probability (0.01).

Item Type:Article
Additional Information:This publication is available on http://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=78
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution: Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Other partners > University of California - UCIrvine (USA)
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
French research institutions > Centre National de la Recherche Scientifique - CNRS
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Deposited By: Jean-yves TOURNERET
Deposited On:09 Sep 2008 09:29

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