S-Video refers to a two-component video interface, which is a dedicated output interface for video signals. S-Video is a 5-core interface, in which two channels transmit video brightness signals, two channels transmit chrominance signals, and one channel is a public shielded ground wire. Since the synthesis, encoding, synthesis and processing of image signal Y and chroma signal C are omitted, Input switching, matrix decoding and other steps in the TV set can effectively prevent the mutual crosstalk of the composite output of brightness and chrominance signals and improve the clarity of the image.
The operating environment of this tutorial: Windows 7 system, Dell G3 computer.
In the audio/video field, in addition to the common HDMI and DVI interfaces, there are also some less popular interfaces. I believe that many users may not have heard of S-Video. As a common interface for equipment, it is also There are also better data transfer functions.
Introduction to S-Video
The specific English name of S-Video is Separate Video, in order to achieve better results In order to improve the video effect, people began to explore a faster, better and higher definition video transmission method, which is S-Video (also known as two-component video interface).
The meaning of S-Video is to transmit the Video signal separately, that is, to separate the chrominance signal C and the brightness signal Y on the basis of the AV interface, and then transmit them in different channels. It appears and Developed in the late 1990s, standard 4-core (excluding sound effects) or expanded 7-core (including sound effects) are usually used.
Advantages of S-Video
S-Video (S-Video) was once one of the most commonly used video interfaces. It is a dedicated output interface for video signals.
The common S terminal is a 5-core interface, two of which transmit video brightness signals, two transmit chroma signals, and one is a public shielded ground wire. Since the image signal Y and chroma signal C are omitted The synthesis, encoding, synthesis, input switching, matrix decoding and other steps in the TV set can effectively prevent the mutual crosstalk of the composite output of brightness and chrominance signals and improve the clarity of the image.
Comparison between S-Video and other audio/video ports
Compared with the AV interface, due to the S-Video (S- Video) no longer performs Y/C mixed transmission, so there is no need to perform bright color separation and decoding work. Moreover, the use of independent transmission channels avoids image distortion caused by signal crosstalk within the video equipment to a large extent, greatly improving the clarity of the image.
But S-Video still needs to mix two color difference signals (Cr Cb) into one chrominance signal C for transmission. Then it is decoded into Cb and Cr for processing in the display device. This will still cause certain signal loss and distortion, and the bandwidth of the chrominance signal is also limited due to the mixing of Cr and Cb. Therefore, although S-Video has been compared Excellent but far from perfect. Although S-Video is not the best, before the popularization of high-definition interfaces such as VGA and HDMI, taking into account other factors such as market conditions and overall cost, it is still the most commonly used video interface.
In the past, DVDs, VCDs, TVs, and PCs all had S-video output functions. Users could connect to the corresponding terminals of these devices through dedicated S-video cables for video input.
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