An audio coder with a very low delay (6-8 ms) for reduced bit rates is presented. Previous coder versions were based on backward adaptive coding, which has suboptimal noise shaping capabilities for reduced bit rate coding. We propose to use a different noise shaping method instead, resulting in an approach which uses forward adaptive predictive coding. We will show that, in comparison, the forward adaptive method has the following advantages: it is more robust against high quantization errors, has additional noise shaping capabilities, has a better ability to obtain a constant bit rate, and shows improved error resilience.

Authors: Hirschfeld, Jens; Krämer, Ulrich; Schuller, Gerald; Wabnik, Stefan
Affiliation: Fraunhofer IDMT
AES Convention: 120 (May 2006) Paper Number: 6747
Publication Date: May 1, 2006 Import into BibTeX
Subject: Low Bit-Rate Audio Coding
Permalink: https://www.aes.org/e-lib/browse.cfm?elib=13551

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