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CD+G
CD+G (also known as CD-G, CD+Graphics, and TV-Graphics) is an extension of the compact disc standard that enables the display of low-resolution graphics alongside audio content when played on a compatible device. This functionality is most commonly associated with karaoke systems, which use CD+G discs to display on-screen lyrics synchronized with music playback. The CD+G format was defined by Philips and Sony as an extension of the Red Book specification for audio CDs.
The first commercially released CD to utilize the CD+G format was Eat or Be Eaten by Firesign Theatre in 1985. A related format, CD+EG, offers enhanced graphical capabilities but has seen little adoption in commercial releases.
The CD+G format takes advantage of the six Compact Disc subcode channels R through W (which are unused in standard Compact Disc Digital Audio), to provide 6 extra bits in CD+G for graphics information per 24 bytes of audio data. When a disc is read at normal speed, these six channels provide only 28.8 kbit/s for graphics, which is enough to provide primitive visuals but which is dwarfed by modern bitrates (for comparison see bit rate § Video).
In the CD+G system, 16-color (4-bit) raster graphics are constructed using tiled rendering with 6×12 pixel tiles (6 pixels wide and 12 lines high). These tiles are typically font definitions for text (such as for karaoke or info about the music). But the tiles can be used in any manner that tile rending permits, such as for fragments which combine together to represent a picture, or simply for patterns to decorate the background. These tiles are displayed in the main central 288×192 pixel area which is surrounded by a 1-tile thick border (for a total raster field of 300×216 pixels). The 16 colors are defined in a color table, which can be manipulated to change the color scheme and simulate primitive animations.
The main instructions for manipulating graphics are:
Compact Disc + Extended Graphics (CD+EG, also known as CD+XG and Extended TV-Graphics) is an enhanced version of the CD+G format. Like CD+G, it stores additional visual data in the subcode channels R to W of a standard audio CD, allowing for the display of graphics and text alongside music playback. CD+EG offers improved graphical capabilities compared to CD+G, including higher resolution and a broader color palette. However, the format saw limited commercial adoption, and few CD+EG titles were released.
CD+EG supports the following display specifications:
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, as well as the Japan-only successor the PC-FX, 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.
Hub AI
CD+G AI simulator
(@CD+G_simulator)
CD+G
CD+G (also known as CD-G, CD+Graphics, and TV-Graphics) is an extension of the compact disc standard that enables the display of low-resolution graphics alongside audio content when played on a compatible device. This functionality is most commonly associated with karaoke systems, which use CD+G discs to display on-screen lyrics synchronized with music playback. The CD+G format was defined by Philips and Sony as an extension of the Red Book specification for audio CDs.
The first commercially released CD to utilize the CD+G format was Eat or Be Eaten by Firesign Theatre in 1985. A related format, CD+EG, offers enhanced graphical capabilities but has seen little adoption in commercial releases.
The CD+G format takes advantage of the six Compact Disc subcode channels R through W (which are unused in standard Compact Disc Digital Audio), to provide 6 extra bits in CD+G for graphics information per 24 bytes of audio data. When a disc is read at normal speed, these six channels provide only 28.8 kbit/s for graphics, which is enough to provide primitive visuals but which is dwarfed by modern bitrates (for comparison see bit rate § Video).
In the CD+G system, 16-color (4-bit) raster graphics are constructed using tiled rendering with 6×12 pixel tiles (6 pixels wide and 12 lines high). These tiles are typically font definitions for text (such as for karaoke or info about the music). But the tiles can be used in any manner that tile rending permits, such as for fragments which combine together to represent a picture, or simply for patterns to decorate the background. These tiles are displayed in the main central 288×192 pixel area which is surrounded by a 1-tile thick border (for a total raster field of 300×216 pixels). The 16 colors are defined in a color table, which can be manipulated to change the color scheme and simulate primitive animations.
The main instructions for manipulating graphics are:
Compact Disc + Extended Graphics (CD+EG, also known as CD+XG and Extended TV-Graphics) is an enhanced version of the CD+G format. Like CD+G, it stores additional visual data in the subcode channels R to W of a standard audio CD, allowing for the display of graphics and text alongside music playback. CD+EG offers improved graphical capabilities compared to CD+G, including higher resolution and a broader color palette. However, the format saw limited commercial adoption, and few CD+EG titles were released.
CD+EG supports the following display specifications:
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, as well as the Japan-only successor the PC-FX, 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.