By PURPLELEC | 15 June 2024 | 0 Comments
What is the S-Video interface?
S-Video, its full English name is Separate Video, also known as SUPER VIDEO. The S-Video connection specification is a specification developed by the Japanese. S stands for "SEPARATE". It separates the brightness and chroma for output, avoiding the mutual interference of brightness and chroma when the mixed video signal is output. The S-Video is actually a five-core interface, consisting of five core wires, two channels of brightness signals, two channels of video chroma signals and one channel of common shielded ground wire.
The emergence of the S-Video has greatly solved the problem of image distortion during the transmission process, but it also has its own shortcomings. For example, compared with the AV interface, since it no longer performs Y/C mixed transmission, it does not need to perform brightness and color separation and decoding. In addition, the use of independent transmission channels largely avoids the image distortion caused by signal crosstalk in the video device, greatly improving the clarity of the image.
However, S-Video still needs to mix the two color difference signals (Cr Cb) into a chrominance signal C for transmission and then decode it into Cb and Cr in the display device for processing. This will still cause some signal loss and distortion (this distortion is very small but can still be found when tested under strict broadcast-level video equipment).
Because the mixing of Cr Cb leads to certain limitations on the bandwidth of the chrominance signal, although S-Video is already relatively good, it is still far from perfect. Although S-Video is not the best, considering the current market conditions and other factors such as comprehensive cost, it is still one of the most commonly used video interfaces.
The maximum resolution output by the S terminal can only reach 1024×768, so it is not suitable for high-definition video transmission, but the S terminal can be easily connected to the output port of the independent graphics card, and is a good companion for ordinary electronic cathode ray tube TVs. As time goes by, the S terminal will be gradually eliminated, and its advantages will be replaced by digital interfaces such as HDMI.
Leave a Reply
Your email address will not be published.Required fields are marked. *