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Revision as of 06:16, 29 November 2018 by Maxpol (talk | contribs) (Add general ATRAC family description.)
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ATRAC (Adaptive TRansform Acoustic Coding) is the collective name for audio compression technologies developed by Sony. This codec family includes the following codecs today: ATRAC, ATRAC3, ATRAC3plus and ATRAC Advanced lossless. You can read about it at

The ATRAC codec was introduced in 1992 with the MiniDisc. There is a good description at It is used in MiniDisc portable players by many companies.

Same as RealAudio atrc, the RealAudio streams are XOR scrambled.

Stored in WAV/AVI, RM and Oma/Omg containers.

Sony Dynamic Digital System (SDDS), used in theatres, is based on ATRAC. Common use of the codec is in Sony made Minidisc and Flash based players.

There are some known variants:

  • ATRAC3
  • ATRAC3plus
  • ATRAC Advanced Lossless (AAL)