How does an audio CD player know to skip data tracks?
(1999/04/11) There are subcode flags for each track: Data If set, the track contains data; if not, the track contains audio. Digital Copy Permitted Used by SCMS. Set to allow copies, clear to prevent them. Four-Channel Audio The Red Book standard allows four-channel audio, though very few discs have ever been made that use it. Pre-Emphasis Set if the audio was recorded with pre-emphasis. The last two are rarely used.
(1999/04/11) There are subcode flags in the Q channel for each track: Data If set, the track contains data; if not, the track contains audio. Digital Copy Permitted Used by SCMS. Set to allow copies, clear to prevent them. Four-Channel Audio The Red Book standard allows four-channel audio, though very few discs have ever been made that use it. Pre-Emphasis Set if the audio was recorded with pre-emphasis. The last two are rarely used.
