MPEG-1 Audio Layer 3, more commonly referred to as MP3, is a popular digital audio encoding and lossy compression format, designed to greatly reduce the amount of data required to represent audio, yet still sound like a faithful reproduction of the original uncompressed audio to most listeners. It was invented by a team of European engineers who worked in the framework of the EUREKA 147 DAB digital radio research program, and it became an ISO/IEC standard in 1991.
The MP3 format uses a hybrid transformation to transform a time domain signal into a frequency domain signal:
MPEG 4 :: Audio Formats
Digital Millennium Copyright Act :: Copyrights

Fraunhofer IIS: MP3 - Features history and technical information about the MP3 format.
Meta Description: [ This page offers information about development, quality and technology of the most popular audio coding standard for digital music: MPEG Layer-3 (MP3) ]
ID3v2 - Description of ID3 tagging standard (version 2) for MP3 files. Includes specifications, implementations and a mailing list.
Meta Description: [ Information about audio tagging such as ID3 and ID3v2. ]
MP3 Tech - Source of detailed technical information about audio encoding with MP3 and similar formats. Features documentation, articles, source code and a message board for programmers.
MP3-O-Phono - A custom made MP3-player device. Site contains many implementation details as well as photos.
MP3licensing.com - Details of the MP3 licensing programs for Thomson Multimedia and Fraunhofer IIS-A.
mp3PRO - Alternate audio compression format that is both backwards and forwards compatible with MP3 yet with significantly smaller file sizes. Site features articles, downloads and a forum.
Meta Description: [ mp3PRO.WS, mp3 PRO news and updates, free software downloads of the world's most popular audio compression format: information and free music. Also MP3 players! ]
MP3Pro Soft - Features software and information about mp3PRO and other similar audio formats.
Meta Description: [ MP3Pro Soft ]
MPEG Audio Frame Header - Technical explanation of how MPEG audio files and their headers are constructed.
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