Adaptive Transform Acoustic Coding

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File Format
Name Adaptive Transform Acoustic Coding
Ontology
Extension(s) .aa3, .at3, .oma

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Description

Adaptive Transform Acoustic Coding (ATRAC) is a family of proprietary audio compression algorithms created by Sony. It was designed to meet the need for the MiniDisc format to maintain high sound quality and a 74 minute playing time, despite having considerably less storage space than an Audio CD.

A number of improved versions of ATRAC have been released since 1992 - ATRAC3 (1999), ATRAC3plus (2002), ATRAC Advanced Lossless (2006).

Per this Washington Post article, Sony has largely dropped support for ATRAC, although it is not clear to what extent. The PlayStation 3 supports playback of ATRAC3plus and ATRAC Advanced Lossless files, and the Wikipedia article suggests that some support remains in Japan.

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