What is a Karaoke CDG Disc?
From Wikipedia, the free encyclopedia
Compact Disc Graphics logo/trademark
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A CD+G (also
known as CD+Graphics) is a special audio
compact disc that contains graphics data in addition
to the audio data on the disc. The disc can be played
on a regular audio CD player, but when played on a special
CD+G player, can output a graphics signal (typically,
the CD+G player is hooked up to a television set or a
computer monitor); these graphics are almost exclusively
used to display lyrics on a television set for karaoke
performers to sing along with.
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Techinical Information about CDG
In each sector there are 2352 bytes (24
* 98) of audio content data and 96 bytes of subchannel data.
The 96 bytes of subchannel information in each sector contain
four packets of 24 bytes apiece :
1 byte for command, 1 byte for instruction, 2 bytes for parityQ,
16 bytes for data, and 4 bytes parityP.
Each of the 96 subchannel data bytes can be thought of as being
divided into 8 bits. Each
of these bits corresponds to a separate stream of information.
These streams are called "channels", and are labeled
starting with the letter P, like so:
| Channel |
P |
Q |
R |
S |
T |
U |
V |
W |
| Bit |
7 |
6 |
5 |
4 |
3 |
2 |
1 |
0 |
Both the P and Q channels on a regular audio CD are used for
timing information. They are used to assist the CD player in
tracking the current location on the disc, and to provide the
timing information for the time display on the CD player. Note
that same space is used for CD-Text as
well.
Channel Q is used for control purposes of more sophisticated
players. It contains position information the Media
Catalog Number (MCN), and International
Standard Recording Code (ISRC). The ISRC is used by the media
industry, and contains information about the country of origin,
the year of publication, owner of the rights, as well as a serial
number, and some additional tags:
