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A Perspective on Stereophonic Acoustic Echo Cancellation

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Single-channel hands-free teleconferencing systems are becoming popular. In order to enhance the communication quality of these sy... Weiterlesen
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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.

Zusammenfassung

This volume assesses the difficulties involved in real-time communication via a single-input/single-output system with complex random variables. As a result, the most important aspects of a SAEC are presented, including the identification of the echo paths with adaptive filters, double-talk detection, and suppression.



Inhalt
Introduction.- Problem Formulation.- System Identification with the Wiener Filter.- A Class of Stochastic Adaptive Filters.- A Class of Affine Projection Algorithms.- Recursive Least-Squares Algorithms.- Double-Talk Detection.- Echo and Noise Suppression as a Binaural Noise Reduction Problem.- Experimental Study.

Produktinformationen

Titel: A Perspective on Stereophonic Acoustic Echo Cancellation
Autor:
EAN: 9783642225741
ISBN: 978-3-642-22574-1
Digitaler Kopierschutz: Wasserzeichen
Format: E-Book (pdf)
Herausgeber: Springer
Genre: Technik
Anzahl Seiten: 139
Veröffentlichung: 25.07.2011
Jahr: 2011
Untertitel: Englisch
Dateigrösse: 7.2 MB