Structured audio and effects processing in the MPEG-4 multimedia standard

Authors:
Eric D. Scheirer
Affiliations:
Machine Listening Group, MIT Lab, Cambridge, MA
Venue:
Multimedia Systems - Special issue on audio and multimedia
Year:
1999

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Abstract

While previous generations of the MPEG multimedia standard have focused primarily on coding and transmission of content digitally sampled from the real world,MPEG-4 contains extensive support for structured, syntheticand synthetic/natural hybrid coding methods. An overviewis presented of the "Structured Audio" and "AudioBIFS"components of MPEG-4, which enable the description ofsynthetic soundtracks, musical scores, and effects algorithmsand the compositing, manipulation, and synchronization ofreal and synthetic audio sources. A discussion of the separation of functionality between the systems layer and the audiotoolset of MPEG-4 is presented, and prospects for efficientDSP-based implementations are discussed.