The S terminal is also very common terminal, its full name is Separate Video, also known as SUPER VIDEO. The S-Video connection specification is a specification developed by Japanese, S means" SEPARATE", it will be the luminance and chrominance separation output, avoiding the mixed video signal output luminance and chrominance interaction. The S terminal is actually a five core interface, composed of two video luminance signal, the video chrominance signal and a public ground shielding of a total of five core lines.

Compared with the AV interface, because it is no longer Y / C hybrid transmission, so there is no further separation and decoding, and the use of independent transmission channel largely avoided the video device signal crosstalk resulting image distortion, greatly improve the image definition. But the S terminal still want two color difference signals ( Cr Cb ) mixed into a chrominance signal C, transmission and then in a display device is decoded into Cb and Cr processing, so how many will still bring a certain signal loss and distortion ( such distortion is small but in the strict broadcast video equipment under test you can still see ). And because Cr Cb hybrid lead chrominance signal bandwidth is also have certain limitations, so the S terminal has been more outstanding, but are still far from perfect. The S terminal is not the best, but given the current market conditions and comprehensive cost and other factors, it is one of the most commonly used video interface.