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A Guide to SVideo
SVideo is a baseband analog video format offering a higher quality signal than composite video, but a lower quality than RGB and component video. This mid-level format divides the signal into two channels - luminance and chrominance. SVideo Signal and Cables
The luminance signal and modulated chrominance subcarrier information are carried on separate synchronized signal/ground pairs. In composite video, the luminance signal is low-pass filtered to prevent crosstalk between high-frequency luminance information and the
color subcarrier. SVideo, however, separates the two, so low-pass filtering is not necessary. This increases bandwidth for the luminance information, and also subdues the color crosstalk problem. While the luminance performance of SVideo compares favorably to analog component video, the chrominance performance—aside from reduced crosstalk—does not show notable improvement over composite video. SVideo signals tend
to degrade considerably when transmitted across more than 5 meters of cable. For long distances, component or composite video may provide better quality. SVideo Connectors
SVideo signals are generally connected using 4-pin mini-DIN connectors using a 75 ohm
termination impedance. The pins in the connectors bend easily, hence care must be taken when plugging the cables in--else a pin is likely to bend, causing the loss of color, corruption of the signal, or complete loss of the signal. Before the mini-DIN plug became standard, SVideo signals were often carried through different types of plugs. For example, the Commodore 64 home computer of the 1980s, one of the first widely available devices to
feature SVideo output, used an 8-pin standard size DIN plug on the computer end and a pair of RCA plugs on the monitor end. Today, SVideo signals can be transferred through SCART connections as well. However the SCART connector must explicitly support SVideo as it is not part of the original SCART standard. SVideo Usage
SVideo is commonly used on consumer DVD players, VTRs, and modern game consoles. It is also available on some professional equipment and computer video capture and playback cards.
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