Bnc cable|What are the common types of video signal transmission cables?

Bnc cable|What are the common types of video signal transmission cables?

1. Video signal interface
Introduction of surveillance video cable types:
According to the material, there are SYV and SYWV. The physical material structure of the insulation layer is different. SYV is a solid polyethylene cable, and SYWV is a high-physical foam cable. The transmission performance of the physical foam cable is better than that of polyethylene.
S--coaxial cable Y--polyethylene V--polyvinyl chloride W--stabilized polyethylene
According to the impedance, it can be divided into SYV 50-XX SYV 75-XX SYV-100 XX XX represents the outer diameter of the insulating layer.
1. Composite video signal: the general connector is BNC, RCA (lotus head) 
75 represents resistance, and the following 3 and 5 represent its insulation outer diameter (3mm/5mm).
S---coaxial radio frequency cable in SYV, Y---polyethylene, V---polyvinyl chloride.
SYV75-3 transmission works well within 200 meters.
SYV75-5 transmission is better within 500 meters.
Bnc cable
2.S-terminal (or Y/C)
Its scientific name is "two-component video interface", commonly known as S-terminal, and the transmission distance is short 15 meters.
The S-Video connection specification is a specification developed by the Japanese. S refers to "SEPARATE (separation)", which separates the brightness and chroma to output, avoiding the mutual interference of brightness and chroma when the mixed video signal is output. The S interface is actually a five-core interface, consisting of two visual brightness signals, two video chrominance signals, and one common shielded ground wire, consisting of five core wires.
Compared with the AV interface, since it no longer carries out Y/C mixed transmission, there is no need for bright color separation and decoding, and the use of independent transmission channels largely avoids the signal crosstalk in the video equipment. The image is distorted, which greatly improves the clarity of the image. However, S-Video still has to mix two color difference signals (Cr Cb) into a chrominance signal C, transmit it and then decode it into Cb and Cr in the display device for processing, which will still cause some signal loss. Distortion (this kind of distortion is very small but can still be found when tested under strict broadcast-grade video equipment). Moreover, the bandwidth of the chrominance signal is also limited due to the mixing of Cr Cb, so although S-Video is already relatively good, it is far from perfect. Although S-Video is not the best, it is still one of the most commonly used video interfaces in consideration of current market conditions and overall cost and other factors.
3. VGA signal
VGA (Video Graphics Array) is a video transmission standard introduced by IBM with PS/2 in 1987. It has the advantages of high resolution, fast display rate, and rich colors, and has been widely used in the field of color displays.
High frequency, easy attenuation, short transmission distance, easy to be interfered.
4. Component video (RGBHV signal)
The color difference interface is based on the S interface, and sends the blue difference (b) and red difference (r) in the chrominance (C) signal separately, and its resolution can reach more than 600 lines. It usually uses YPbPr and YCbCr two logos, the former represents progressive scan color difference output, and the latter represents interlaced scan color difference output. Many TV products now rely on component input to improve the quality of the input signal, and through the component interface, a variety of levels of signals can be input, from the most basic 480i to 480p with octave scanning, and even 720p, 1080i, etc. Only through the color difference input can the signal be transmitted to the TV.
5. DVI
DVI-A (Analog) interface: This interface is actually a modification of the VGA interface. It used to be mostly used on some high-end CRT monitors, but it has been basically eliminated. The "fake DVI interface" we often say refers to DVI-A, because it still transmits analog signals instead of digital signals that reflect the advantages of DVI technology.
DVI-D (Digital, digital) interface: DVI-D is a true digital signal interface, which is more advanced than DVI-A; but the DVI-D interface also has shortcomings, that is, users cannot use this interface Compatible with old-fashioned CRT monitors, if it happens that there is only a D-Sub interface on the LCD monitor, then the user will only be stared.
DVI-I (Integrated, integrated) interface: This is a hybrid interface that integrates DVI-A and DVI-D. It can be compatible with both DVI-D and DVI-A (it can also be switched via an adapter). Connected to D-Sub), is currently the most compatible DVI interface.
Generally speaking, when transmitting video signals below 1600×1200@60Hz, there is no obvious difference between using single-channel DVI and dual-channel DVI. If your monitor can support Full HD (1920×1080) or above resolution, don't choose a single-channel DVI cable.
6.HDMI
It uses the same underlying protocol as the DVI digital signal, so it can also be interchanged with the DVI signal through an adapter, compatible with the DVI signal. More powerful than the DVI interface is that HDMI allows the transmission of high-fidelity audio signals through the HDMI cable when establishing the communication protocol. The seamless connection reduces the trouble of the connection and also allows HDMI to have a wider range of compatibility.
Supports 5Gbps data transfer rate, up to 15 meters
Compared with DVI, HDMI can transmit digital audio signals, and adds support for HDCP, while providing better DDC optional functions. HDMI supports a data transfer rate of 5Gbps, and can transmit up to 15 meters, which is enough to cope with a 1080p video and an 8-channel audio signal. And because a 1080p video and an 8-channel audio signal require less than 4GB/s, HDMI still has a lot of margin. This allows it to connect the DVD player, receiver and PRR separately with one cable. In addition, HDMI supports EDID and DDC2B. Therefore, devices with HDMI have the "plug and play" feature. The signal source and the display device will automatically "negotiate" to automatically select the most suitable video/audio format.
6.SDI
SDI (serial digital interface) is a "digital component serial interface". Then HD-SDI is a high-definition digital component serial interface. HD-SDI is a real-time uncompressed high-definition broadcast and television camera. It is another technological advancement in the field of security surveillance, and it is a device that provides a high-definition image source for the surveillance center.