Philips CDD522 Operating Instructions Manual page 31

There are 16 audio channels, they can have channel number 0 to
15. The video and data channels can be located on numbers 0
to 31.
The Submode Byte contains flags used to indicate the properties
of its sector (like Data sector, Audio sector or Video sector).
The Coding Information Byte indicates how the information in that
sector is encoded. Its contents must be interpreted differently,
depending on the Subcode Byte flags.There are Audio coding
formats, Video coding formats and Data coding formats.
For more information about the Subheader contents, see the
Green Book, Appendix A II.
Chapter 5. Layer Five: The Track Structure
Tracks are units built from sectors that have the same Mode. No
Mode Mixing is allowed on any type of disk, within a track.
in CDDA, tracks contain one song. The access of the songs is
done by track-jumping. This is the basic data-unit in CDDA
(there is a sub-unit, called the Index and given in X in the Q-Data,
See chapter 3 p 23: The Subcode Structure)
Each track can start with a optional pre-gap of 2 seconds digital
silence.
Tracks also exist on Yellow and Green disks. The color of a
track may not change within the track.
Intra-track time is given in the Q channel by MIN, SEC, FRAME
and is known as Relative Time. It starts at 00 seconds at the first
non-silence audio sample.
Inter-track or disk time is also given in the Q channel by AMIN,
ASEC, AFRAME. It is known as the Absolute Time and runs
over trackboundaries.
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