Everything about Cd G totally explained
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 connected 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.
In each sector there are 2352
bytes (24 * 98) of audio content data and 96 bytes of
compact disc subcode.
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 parity Q,
- 16 bytes for data, and
- 4 bytes parity P.
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 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:
Data: This track contains Data (rather than audio). Can be used for muting in audio CD Players.
SCMS Flag: Used by the Serial Copy Management System to indicate permission to digitally copy the track.
Four-channel compact disc digital audio: The track uses four channel audio. Used very rarely on Compact Discs.
Pre-Emphasis: The audio track was recorded with pre-emphasis. Used very rarely on Compact Discs.
The CD+G format takes advantage of the channels R through W, which are unused in standard audio CD formats. These six bits store graphics information.
In the CD+G system, 16-color (4-bit) graphics are displayed on a raster field which is 300×216 pixels in size.
Among the consumer devices that play CD+G format CDs are the NEC TurboGrafx-CD (a CD-ROM peripheral for the TurboGrafx-16) and Turbo Duo, the Philips CD-i, the Sega Saturn and Sega CD, the 3DO Interactive Multiplayer, the Commodore Amiga CD32 and CDTV, and the Atari Jaguar CD (which was an attachment for the Atari Jaguar).
CD+G has had a resurgence of late, and is being used for CDs for karaoke systems, with the graphics used to display song lyrics.
CDs released in CD+G format
Alphaville - The Breathtaking Blue - 1989
Anita Baker - Rapture - 1986
Bonnie Raitt - Green Light - 1982
Bonnie Raitt - Nine Lives - 1986
Chris Isaak - Silvertone - 1985
The Firesign Theatre - Eat or be Eaten - 1985
Fleetwood Mac - Behind the Mask - 1990
Gram Parsons - G.P./Grievous Angel - 1990
Information Society - Information Society - 1988
High School Musical Soundtrack - 2006
Jimi Hendrix - Smash Hits - 1988
Laura Branigan - Laura Branigan - 1990
Little Feat - Hoy-Hoy! - 1989
Little Feat - Representing The Mambo 1990
Lou Reed - New York - 1989
Talking Heads - Naked - 1988
Van Dyke Parks - Tokyo Rose - 1989
The Flamin Groovies - Groovies Greatest Grooves - 1989Further Information
Get more info on 'Cd G'.
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