A Perspective on Stereophonic Acoustic Echo Cancellation

1. Front Matter

   PDF

2. Introduction

   • Jacob Benesty, Constantin Paleologu, Tomas Gänsler, Silviu Ciochină

   Pages 1-4

3. Problem Formulation

   • Jacob Benesty, Constantin Paleologu, Tomas Gänsler, Silviu Ciochină

   Pages 5-11

4. System Identification with the Wiener Filter

   • Jacob Benesty, Constantin Paleologu, Tomas Gänsler, Silviu Ciochină

   Pages 13-27

5. A Class of Stochastic Adaptive Filters

   • Jacob Benesty, Constantin Paleologu, Tomas Gänsler, Silviu Ciochină

   Pages 29-48

6. A Class of Affine Projection Algorithms

   • Jacob Benesty, Constantin Paleologu, Tomas Gänsler, Silviu Ciochină

   Pages 49-62

7. Recursive Least-Squares Algorithms

   • Jacob Benesty, Constantin Paleologu, Tomas Gänsler, Silviu Ciochină

   Pages 63-69

8. Double-Talk Detection

   • Jacob Benesty, Constantin Paleologu, Tomas Gänsler, Silviu Ciochină

   Pages 71-79

9. Echo and Noise Suppression as a Binaural Noise Reduction Problem

   • Jacob Benesty, Constantin Paleologu, Tomas Gänsler, Silviu Ciochină

   Pages 81-94

10. Experimental Study

    • Jacob Benesty, Constantin Paleologu, Tomas Gänsler, Silviu Ciochină

    Pages 95-135

11. Back Matter

    PDF

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.

• FRLS fast recursive least-squrares
• IPNLMS improved proportionate normalized least-mean-square
• PAPA proportionate affine projection algorithm
• RLS recursive least-squares
• VSS-NLMS variable step size normalized least-mean-square
• Wiener filter
• double-talk detection
• stereophonic acoustic echo cancellation
• suppression
• widely linear model

• INRS-EMT, University of Quebec, Montreal, Canada

  Jacob Benesty

• Telecommunications Department, University Politehnica of Bucharest, Bucharest, Romania

  Constantin Paleologu

• mh acoustics LLC, Summit, USA

  Tomas Gänsler

• Telecommunications Department, Politehnica University of Bucharest, Bucharest, Romania

  Silviu Ciochină

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