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S-Video

S-Video (also known as Y/C) is a baseband analog video[?] format offering a higher quality signal than composite video, but a lower quality than component video. This mid-level format divides the signal into two channels - luminance and chrominance.

The luminance signal and modulated chrominance subcarrier[?] information are carried on separate signal/ground pairs. The luminance signal is effectively a black-and-white television signal with the timing of a colour composite video signal. Because the luminance signal is carried on a separate wire, it does not need to be low-pass filtered to prevent crosstalk between high-frequency luminance information and the colour subcarrier.

This allows a higher bandwidth to be used for the luminance information, and also eliminates the colour crosstalk problem.

The luminance performance of S-Video is similar to analog component video, but the chrominance performance retains most of the other defects of composite video, apart from the crosstalk problem.

S-Video signals are generally connected using 4-pin mini-DIN connectors using a 75 ohm termination impedance.

S-Video is commonly used on consumer VTRs, and is also available on some professional equipment and computer video capture and playback cards.

See also

This entry contains some text from FOLDOC, used by permission.



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