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Convention Paper

Ultra Low Delay Audio Coding with Constant Bit Rate

Authors: Hirschfeld, Jens; Klier, Juliane; Kraemer, Ulrich; Schuller, Gerald; Wabnik, Stefan

AES Convention 117 · Paper 6197 · October 2004

Abstract

The Ultra Low Delay (ULD) codec developed at the Fraunhofer IDMT is based on a versatile perceptual audio coding method that achieves very low encoding/decoding delay and is nevertheless capable of high compression ratios. Utilizing a perceptual model for irrelevance reduction, the ULD codec is in principle a variable bit rate codec. To achieve coding with constant bit rate, the use of bit reservoir techniques would result in additional coding delay. This paper presents a rate loop which ensures constant bit rate coding without increasing coding delay. It is shown that this technique does not decrease the decoded audio quality significantly.

Details

Published in
AES Convention 117
AES Convention
117
Paper number
6197
Publication date
October 6, 2004
Session subject
Lossy and Lossless Audio Coding
Affiliation
Fraunhofer Institute for Digital Media Technology, Ilmenau, Germany (See document for exact affiliation information.)
Type
Convention Paper