Sony ATRAC
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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
- ATRAC Advanced Lossless (AAL)
An overview of this product family can be found here: http://www.sony.net/Products/ATRAC3/overview/index.html#family
ATRAC-compressed audio is usually stored in WAV/AVI, RM and Oma/Omg containers.