CD+G

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CD+G
Media type Optical disc
Encoding Various
Capacity Typically up to 700 MB (up to 80 minutes audio)
Read mechanism 780 nm wavelength semiconductor laser
Developed by Philips & Sony
Usage Audio, image, and data storage
Optical discs

CD+G (also known as CD-G, CD+Graphics and TV-Graphics[1]) is an extension of the compact disc standard that can present low-resolution graphics alongside the audio data on the disc when played on a compatible device. CD+G discs are often used for karaoke machines, which utilize this functionality to present on-screen lyrics for the song contained on the disc. The CD+G specifications were published by Philips and Sony in an updated revision of the Red Book specifications.[2][3]

The first CD to be released with CD+G graphics was Eat or Be Eaten by Firesign Theatre in 1985.[4] The CD+EG is a similar format that allows for better graphics, but has been used very rarely.[2]

Players

Along with dedicated Karaoke machines, other consumer devices that play CD+G format CDs include the NEC TurboGrafx-CD (a CD-ROM peripheral for the PC Engine/TurboGrafx-16) and Turbo Duo, the Philips CD-i, the Sega Saturn, Mega-CD, the JVC X'Eye, the 3DO Interactive Multiplayer, the Amiga CD32 and Commodore CDTV, and the Atari Jaguar CD (which was an attachment for the Atari Jaguar). Some CD-ROM drives can also read this data. Since 2003, some standalone DVD players have supported the CD+G format.

Implementation

The CD+G format takes advantage of the subcode channels R through W, which are unused in standard audio CD formats. These six bits store graphics information.[2]

In the CD+G system, 16-color (4-bit) graphics are displayed on a raster field which is 300×216 pixels in size.

See also

References

  1. ↑ Approved Compact Disc Logo configurations
  2. ↑ 2.0 2.1 2.2 CD+G revealed - The HTML version of the no longer available cdg_revealed.txt file
  3. ↑ Approved Compact Disc Logo configurations
  4. ↑ Brewer, Bryan; Key, Edd (1987). The Compact Disc Book. Harcourt Brace Jovanovich. p. 96. 

External links

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