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 so called 'non backwards compatible' (NBC) coding 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 planned work for MPEG NBC and MPEG-4 audio will be presented.
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