S-Video's full English name is Separate Video. In order to achieve better video effects, people began to explore a faster and better resolution video transmission method, which is currently the current S-Video (also known as two-component video interface).
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The meaning of Separate Video is to separate the Video signal, that is, to separate the chrominance signal C and the luminance signal Y on the basis of the AV interface, and then transmit them in different channels respectively. It appears and develops in the late 1990s. Standard 4-core (without sound) or extended 7-core (with sound) is usually used.
Graphics cards and video devices with S-Video interfaces (such as analog video capture/editing card TVs and quasi-professional monitor TV cards/TV boxes and video projection devices) are currently more common, compared to AV interfaces because it is not Then Y/C hybrid transmission is performed, so there is no need to perform bright color separation and decoding work, and the use of independent transmission channels largely avoids image distortion caused by signal crosstalk in the video device, greatly improving the image. Sharpness.
However, S-Video still needs to mix two color difference signals (Cr Cb) into one chrominance signal C, transmit it and then decode it into Cb and Cr in the display device for processing, so that it still brings some signal loss. Distortion (this distortion is small but can still be found when testing under strict broadcast-grade video equipment), and the bandwidth of the chrominance signal is limited due to the mixing of Cr Cb, so S-Video is excellent but It is still far from perfection.
Although S-Video is not the best, it is the most popular video interface considering other factors such as current market conditions and overall cost.
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