MP3 is an audio-specific format that was designed by the Moving Picture Experts Group
(MPEG) as part of its MPEG-1
standard and later extended in MPEG-2
standard. The first MPEG subgroup – Audio
group was formed by several teams of engineers at Fraunhofer IIS
, University of Hannover
, AT&T-Bell Labs
, and others.
MPEG-1 Audio (MPEG-1 Part 3), which included MPEG-1 Audio Layer I, II and III was approved as a committee draft of ISO
standard in 1991,
finalised in 1992
and published in 1993 (ISO/IEC 11172-3:1993
Backwards compatible MPEG-2 Audio (MPEG-2 Part 3) with additional bit
rates and sample rates was published in 1995 (ISO/IEC 13818-3:1995).