Audiovisual introductions in 1992

thumb|The Sony MZ1, the first MiniDisc player, released in 1992.

Adaptive Transform Acoustic Coding (ATRAC) is a family of proprietary audio compression algorithms developed by Sony. MiniDisc was the first commercial product to incorporate ATRAC, in 1992. ATRAC allowed a relatively small disc like MiniDisc to have the same running time as a CD while storing audio information with minimal perceptible loss in quality. Improvements to the codec in the form of ATRAC3, ATRAC3plus, and ATRAC Advanced Lossless followed in 1999, 2002, and 2006 respectively.

magnetic tape cassette for digital audio, backward-compatible with the analogue Compact Cassette

cinema sound system

thumb|An S-VHS tape, which is also used for ADAT

digital audio medium

electronic book player