is an umbrella term
that refers to many standards of means of playing back audio on a CD
or a DVD
- Red Book audio - the original means of playing back audio on the medium.
- 5.1 Music Disc - an extension to the red book standard that uses DTS 5.1 surround sound.
- Super audio CD - A format which competes with DVD-Audio. Also uses a proprietary design that can't be easily mimicked by consumer CD copying software.
- MP3 CD - A CD which contains MP3 files in data mode rather than converted from MP3 to red book mode.