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MP3
(redirected from MPEG Audio Layer 3)

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MP3

Audio compression format that uses perceptual audio coding and psychoacoustic compression to strip inaudible and unnecessary information from sound signals. MP3 packs a minute of sound, at near CD quality, into about 1 megabyte. This makes delivering music directly over the Internet a viable prospect. MP3 is Layer 3 of the MPEG-2 video compression system developed by the Moving Pictures Expert Group (MPEG).

Despite its popularity, MP3 no longer has the best audio quality or highest compression ratio of perceptual encoding schemes. The two competitors are MP4, which is a proprietary format based on MPEG-2 ACC technology, and Microsoft's Windows Media Audio (WMA), which is capable of producing a similar sound quality to MP3, but with half the file size.

MP3 is widely used in music downloads.
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