The MPEG-4 General Audio Coder-Bernhard Grill, Fraunhofer Institut für Integrierte Schaltungen IIS-A, Erlangen, Germany (Invited): The paper presents the MPEG-4 general audio (GA) coder which, unlike the MPEG-4 speech or synthetic coding schemes, is designed to work with any type of audio material. The GA coder includes all features of MPEG-2 AAC, plus extensions for improved coding quality at very low bit rates, including the TwinVQ scheme. In addition, embedded coding techniques-where one program is represented by a hierarchical set of coding layers-further extend the capabilities.
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