Component video requires an extra synchronization signal to be sent along with the video. Component video sync signals can be sent in several different ways:
Separate sync
Uses separate wires for horizontal and vertical synchronization. When used in RGB (i.e. VGA) connections, five separate signals are sent (Red, Green, Blue, Horz. Sync, Vert. Sync).
Composite sync
Combines horizontal and vertical synchronization onto one pair of
wires. When used in RGB connections, four separate signals are sent
(Red, Green, Blue, Sync).
Sync-on-green (SOG)
Combines composite sync with the green signal in RGB. Only three
signals are sent (Red, Green with Sync, Blue). This synchronization
system is used in - among other applications - many systems by Silicon Graphics and Sun Microsystems through a DB13W3 connector.
Sync-on-luminance
Similar to sync-on-green, but combines sync with the luminance signal (Y) of a color system such as YPbPr. This is the synchronization system normally used in home theater systems.
Sync-on-composite
The connector carries a standard composite video signal along with the RGB components, for use with devices that cannot
process RGB signals. For devices that do understand RGB, the sync
component of that composite signal is used along with the color
information from the RGB lines. This arrangement is found in the SCART connector in common use in Europe and some other PAL/SECAM areas.
External links
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VGA to Sync-On-Green adapter — circuit to convert VGA sync to sync-on-green.
See also
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Composite video - can be contrasted with component video
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Vertical sync
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SCART
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