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So on the 4 pole jack, there is left and right audio, video and a common ground return wire. The jack is designed so that you can insert a stereo (3 pole left and right audio and common ground) into the same socket and all that happens is the video connection is not made.
Composite video only needs 1 connection and a ground return wire. This is because all the colour information is combined with the black and white and sync signals. In S-Video, the colour and black and white information is separated, giving better quality and in a component system, there's further separation of the colour giving better quality again. |
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