A Perspective on Stereophonic Acoustic Echo Cancellation

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Springer Science & Business Media, Jul 25, 2011 - Technology & Engineering - 139 pages
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Single-channel hands-free teleconferencing systems are becoming popular. In order to enhance the communication quality of these systems, more and more stereophonic sound devices with two loudspeakers and two microphones are deployed. Because of the coupling between loudspeakers and microphones, there may be strong echoes, which make real-time communication very difficult. The best way we know to cancel these echoes is via a stereo acoustic echo canceller (SAEC), which can be modelled as a two-input/two-output system with real random variables. In this work, the authors recast this problem into a single-input/single-output system with complex random variables thanks to the widely linear model. From this new convenient formulation, they re-derive the most important aspects of a SAEC, including identification of the echo paths with adaptive filters, double-talk detection, and suppression.
 

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Contents

Introduction
1
Problem Formulation
5
System Identification with the Wiener Filter
13
A Class of Stochastic Adaptive Filters
28
A Class of Affine Projection Algorithms
49
Recursive LeastSquares Algorithms
63
DoubleTalk Detection
71
Echo and Noise Suppression as a Binaural Noise Reduction Problem
80
Experimental Study
95
Index
136
Copyright

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About the author (2011)

INRS-EMT, University of Quebec