Encoder implementations of MPEG Advanced Audio Coding and Layer-3 (mp3) on 32-bit or 16-bit fixed-point processors are challenging due to the fact that the usable word length is restricted to 32 bits if low processing power is required. This paper describes the modifications and optimizations that had to be applied to the algorithms of these audio encoders to make a true fixed-point implementation on a 32-bit or 16-bit device possible. The implementation had to be done without using floating-point emulations or even 64-bit values for the signal energies and thresholds in the psychoacoustic model of the encoder. At the same time high encoding quality and speed were required. Memory and processing power requirements on various platforms as well as results from a subjective listening test will be presented.

Authors: Lohwasser, Markus; Gayer, Marc; Lutzky, Manfred
Affiliation: Fraunhofer Institute for Integrated Circuits IIS, Erlangen, Germany
AES Convention: 115 (October 2003) Paper Number: 5978
Publication Date: October 1, 2003 Import into BibTeX
Session Subject: Psychoacoustics; Audio Coding
Permalink: https://www.aes.org/e-lib/browse.cfm?elib=12419

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