OVERVIEW OF MPEG AUDIO - CURRENT AND FUTURE STANDARDS FOR LOW-BIT-RATE AUDIO CODING

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