Since 1988 MPEG has been working on the standardization of high-quality low bit-rate audio coding. In 1992 and 1994 the MPEG-1 and MPEG-2 audio standards were completed. Current work in MPEG includes the MPEG-2 advanced audio coding (MPEG-2 AAC) of stereo or multichannel sound material and the audio part of MPEG-4. Common features as well as differences between MPEG-1 and MPEG-2 audio, other current audio coding systems currently in use, and the new work for MPEG-2 AAC and MPEG-4 audio will be presented.
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