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MPEG-1 audio layer 3
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music, file format (MP3) A digital audio compressionalgorithm that acheives a compression factor of about twelve
while preserving sound quality. It does this by optimising
the compression according to the range of sound that people
can actually hear. MP3 is currently (July 1999) the most
powerful algorithm in a series of audio encoding standards
developed under the sponsorship of the Moving Picture ExpertsGroup (MPEG) and formalised by the International Organization
for Standardization (ISO).
MP3 is very different from Layer 2, using an additional MDCT
layer to increase frequency resolution. Its scale factor
groups are more optimised for the human ear, and it uses
MP3 files (filename extension ".mp3") can be downloaded from
many World-Wide Web sites and can be played using software
available for most operating systems (also downloadable),
e.g. Winamp for PC, MacAmp for Macintosh, and mpeg123 for