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A clear understanding of today’s video signals
Article Number: 24 | Rating: Unrated | Last Updated: Wed, Aug 17, 2011 at 2:30 PM
Understanding the differences between Composite Video, S-Video and Component Video
With the growth of home theatre, video cameras and the consumer
electronics market many of today's computers and peripherals (especially
LCDs) have multiple video input options available to them. Here is a
clearer picture of what these signals represent.
S-Video (Super-Video, Super-VHS) and sometimes referred to as Y/C Video was introduced in the 1980s and solved some of the problems that were inherent with composite video. S-Video provides better color separation and a much cleaner signal by keeping the transmitted luminance and chrominance video signals separated.
Today, S-Video signals are generally connected using 4-pin mini-DIN connectors using a 75 ohm termination impedance. S-Video provides for a high quality method of delivering a clean crisp video signal.
Component video improves the picture quality even more than S-Video. Component refers to video transmitted as three separate signals (subsignals if you prefer) to represent all colors. The first component video was RGB since the three signals represented pure red, pure green, and pure blue content respectively. Today, most video experts use the term "component video" as short for "analog component video" consisting of the three signals Y (luminance), Pr or R-Y, and Pb or B-Y. For NTSC or PAL (interlaced video formats) the Y signal is the same as that used to construct composite video or that found in S-Video.
The most common connection from DVD players is three RCA-type jacks.
(For a very technical explanation of color television and component video,
seeTektronix's Web site.)
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