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Advances in Multimedia
Volume 2007 (2007), Article ID 12308, 16 pages
http://dx.doi.org/10.1155/2007/12308
Research Article

WLAN Technologies for Audio Delivery

1Audio Technology Group, Department of Electrical and Computer Engineering, University of Patras, Patras 26500, Greece
2Department of Audio Visual Arts, Ionian University, Plateia Tsirigoti 7, Corfu 49100, Greece

Received 21 April 2007; Revised 30 August 2007; Accepted 27 December 2007

Academic Editor: Tasos Dagiuklas

Copyright © 2007 Nicolas-Alexander Tatlas et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Audio delivery and reproduction for home or professional applications may greatly benefit from the adoption of digital wireless local area network (WLAN) technologies. The most challenging aspect of such integration relates the synchronized and robust real-time streaming of multiple audio channels to multipoint receivers, for example, wireless active speakers. Here, it is shown that current WLAN solutions are susceptible to transmission errors. A detailed study of the IEEE802.11e protocol (currently under ratification) is also presented and all relevant distortions are assessed via an analytical and experimental methodology. A novel synchronization scheme is also introduced, allowing optimized playback for multiple receivers. The perceptual audio performance is assessed for both stereo and 5-channel applications based on either PCM or compressed audio signals.