A Perspective on Stereophonic Acoustic Echo Cancellation

Beschreibung

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.
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.
Delivers a new convenient formulation with single-input/single-output System with complex random variables for stereo acoustic echo canceller Includes experimental studies Written by well-knows experts in the area

Autor*in

Jacob Benesty

Themen in »A Perspective on Stereophonic Acoustic Echo Cancellation«

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

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