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Reduced Bit Rate Ultra Low Delay Audio Coding

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 Import into BibTeX
Subject:Low Bit-Rate Audio Coding

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