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Delayless mixing - On the benefits of MPEG-4 AAC-ELD in high quality communication systems

Verzögerungsfreies Mischen - Über die Vorzüge von MPEG-4 AAC-ELD in hochqualitativen Kommunikationssystemen
: Schnell, M.; Schmidt, M.; Ekstrand, P.; Albert, T.; Przioda, D.; Lutzky, M.; Geiger, R.; Ruoppila, V.; Henn, F.; Tärnes, E.

Audio Engineering Society -AES-:
124th Audio Engineering Society Convention 2008. Vol.1 : May 17 - 20, 2008, Amsterdam, the Netherlands
Red Hook, NY: Curran, 2008
ISBN: 978-1-605-60295-0
Audio Engineering Society (Convention) <124, 2008, Amsterdam>
Conference Paper
Fraunhofer IIS ()

Tele- and video conferencing systems for modern business communication are managed by central hubs, so-called multipoint control units (MCU). One major task of these units is the mixing of audio streams from the participating sites. This is traditionally done by decoding the streams, mixing in time domain and then re-encoding of the mixed signals. This requires additional processing power, leads to increased delay and degraded audio quality. It is demonstrated how the recently standardized MPEG-4 Enhanced Low Delay AAC (AAC-ELD) codec offers a solution to these problems by efficient and delayless mixing in the transform domain of the codec.