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Convention Paper

A Bit Rate Scalable Perceptual Coder for MPEG-4 Audio

Authors: Grill, Bernhard

AES Convention 103 · Paper 4620 · September 1997

Abstract

The paper describes a bit-rate scalable coder of the current MPEG-4 Audio working draft. The coder allows to decode useful subsets of the bitstream. This scalability is achieved by combining a core coder which, in general, is not a perceptual coder, with one or more stages based on the perceptual coding modules of the MPEG-4 Audio working draft. Despite the usage of nonperceptual core coders such as ITU-T G.729, G.723.1 or the MPEG-4 CELP coder, the system still maintains complete control over the psychoacoustic model in the combined states, thus reaching the same quality as the un-scaled MPEG Audio coders, although at somewhat higher bit rates. However, the system achieves a better bit-rate efficiency than a simul-cast solution.h

Details

Published in
AES Convention 103
AES Convention
103
Paper number
4620
Publication date
September 6, 1997
Session subject
Low Bit-Rate Coding Technology
Affiliation
Lehrstuhl furTechnische Elektronik, Universitat Erlangen-Numberg, Efiangen, Germany (See document for exact affiliation information.)
Type
Convention Paper