CD+G
CD+G
| Media type | Optical disc |
|---|---|
| Encoding | Various |
| Capacity | Typically up to 800 MB (up to 80 minutes audio) |
| Readmechanism | 780 nm wavelength semiconductor laser |
| Developedby | Philips & Sony |
| Usage | Audio, image, and data storage |
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 use 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][1]
| Media type | Optical disc |
|---|---|
| Encoding | Various |
| Capacity | Typically up to 800 MB (up to 80 minutes audio) |
| Readmechanism | 780 nm wavelength semiconductor laser |
| Developedby | Philips & Sony |
| Usage | Audio, image, and data storage |
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 TurboGrafx-16) and Turbo Duo, the Philips CD-i, the Sega CD, Sega Saturn, the JVC X'Eye, the 3DO Interactive Multiplayer, the Amiga CD32 and Commodore CDTV, and the Atari Jaguar CD (an attachment for the Atari Jaguar). Some CD-ROM drives can also read this data. Pioneer's LaserActive player can also play CD+G discs, as long as either the PAC-S1/S-10 or PAC-N1/N10 game modules are installed.
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, of which only the central 288×192 area is used with a flat-coloured border (6 pixels wide, 12 lines high) drawn around it.
Compact Disc + Extended Graphics
Compact Disc Extended Graphics logo
Compact Disc + Extended Graphics (CD+EG, also known as CD+XG and Extended TV-Graphics[5]) is an improved variant of the Compact Disc + Graphics (CD+G) format. Like CD+G, CD+EG utilizes basic audio CD features to display text and video information in addition to the music being played. This extra data is stored in the subcode channels R-W. Very few, if any, CD+EG discs have been published.[2]
Specifications
288 pixels per line
192 lines
up to 256 colors
See also
Karaoke
MP3+G