ATRAC Advanced Lossless
ATRAC Advanced Lossless (AAL) is the most recent addition to the proprietary Advanced Transform Acoustic Coding family of audio codecs developed by Sony. It is most commonly used for storage and playback of audio on MiniDiscs. AAL uses "scalable" compression - an AAL file contains a lossy ATRAC3 or ATRAC3plus stream and a stream of correction data which can be combined with the lossy stream to reproduce the original data.
The format is supported by Sony MiniDisc players and some of the Sony Walkman range (usually older players).
- Vijay Madisetti - Video, Speech and Audio Signal Processing and Associated Standards (Section 5.5.5 - ATRAC Advanced Lossless)
- MultimediaWiki - Sony ATRAC
- RFC 5584 - RTP Payload Format for the Adaptive TRansform Acoustic Coding (ATRAC) Family