What is the S-terminal input?

s terminal is also a very common terminal, its full name is separate video, also known as SUPER video. S-video Connection specification is a specification developed by the Japanese, s refers to the "separate (separation)", which separates the brightness and chroma from the output, avoiding the interference of brightness and chroma when the mixed video signal is output. The S-terminal is actually a five-core interface, consisting of two-channel video brightness signal, two-channel video chroma signal and a total of five core lines of public shielding ground.

S-terminal structure

The S-terminal is based on the AV terminals in Japan. From the hardware structure, the S-terminal is actually a five-core interface, consisting of two-way brightness signal, two-channel video color signal and a public shielded ground line of five core lines (in fact, with its matching brightness, chroma separator). It is not difficult to see from its structure that it is used to separate the brightness and chroma of the output device. This design is mainly for the video program composite output when the brightness and chroma of mutual interference. The composition image requires at least 3 signals (generally luminance signals with two chromatic aberration signals, both y/c/r). However, radio and television signals need to be transmitted remotely, and the receiver cannot use 3 receivers to demodulation the 3 signals separately. Therefore, these signals must be "compound" together, modulated to a high-frequency transmission on the wave, the ancient receiver to use high-frequency head.

S-Terminal enhanced AV terminal

After the introduction of the above we can understand that the S-terminal is actually just an enhanced AV terminals, in any case not to the effect of the output color difference. But its application on the display card has greatly enhanced the function of PC multimedia.

s terminal line

Compared with the AV interface, because it no longer carries on the Y/C mixed transmission, therefore also does not need to carry on the bright color separation and the decoding work, moreover uses each independent transmission channel to greatly avoids the video signal crosstalk to produce the image distortion, greatly enhances the image clarity. However, the s-video still have to mix the two-channel color difference signal (Cr Cb) into a chroma signal C, the transmission and then in the display device to decode the Cb and Cr processing, so how much will still bring a certain signal loss and produce distortion (this is very small distortion but in the strict broadcast-level video device test can still be found). And as a result of the CR CB mixed color Signal bandwidth also has a certain limit, so s-video although has been relatively excellent, but far from perfect. S-video is not the best, but it is one of the most widely used video interfaces, given the current market conditions and the combined costs of other factors.

Seven-pin s terminal

There is also a point is that the S terminal can only transfer video, does not support audio transmission, so want to transfer audio also need to use a dedicated audio line.