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Convention Paper

High Quality Sound Coding at 2.5 Bit/Sample

Authors: Brandenburg, Karlheinz

AES Convention 84 · Paper 2582 · March 1988

Abstract

The algorithm described in the paper allows a reduction of the bit rate needed for coding CD-quality signals to 2.5 bit/sample and still gain in subjective quality when compared with other known algorithms for high quality sound coding. Coding signals with a very sharp rise in amplitude (e.g. triangle or glockenspiel) induces short (e.g. 10ms) preechoes which are audible in some cases. This problem of all frequency domain coding algorithms can be reduced using a special "post filtering" algorithm together with a few bits of additional side information. Transform-based coding algorithms need overlapping and windowing of the input data blocks. With a new technique called time domain aliasing cancellation (TDAC) full overlapping of input blocks is possible without increasing the data rate needed for transmission.

Details

Published in
AES Convention 84
AES Convention
84
Paper number
2582
Publication date
March 6, 1988
Session subject
Digital Converters
Affiliation
Erlangen University, Erlangen, W. Germany (See document for exact affiliation information.)
Type
Convention Paper