1, RF Coaxial Cable: Initial Experience of Television Signal
When it comes to old-fashioned video cables, it is worth mentioning RF (Radio Frequency) coaxial cables, which are one of the earliest cables used for television signal transmission. In the era when cable TV was not yet popular, many households received wireless TV signals through antennas on their roofs, and the connection between this antenna and the TV was RF coaxial cable. It became the main force in television signal transmission at that time due to its excellent anti-interference ability and long transmission distance. Although RF coaxial cables transmit analog signals with much lower picture quality than today's digital signals, they have opened a window for people to understand the world through television and are the starting point for countless home entertainment activities.
2, AV line: a symbol of the era of composite video
With the popularity of cable TV and video recorders, AV (Audio Video) cables have gradually entered people's field of vision. The AV cable consists of three independent cables: the red and white audio cables are responsible for transmitting the left and right channels respectively, while the yellow video cable is responsible for transmitting the composite video signal. This design enables AV cables to simultaneously transmit audio and video signals, greatly enriching the choices for home entertainment. In the era when VCDs and DVDs were popular, AV cables became an important bridge connecting televisions with various audiovisual devices. It witnessed the transition from black and white television to color television, and accompanied generation after generation through countless unforgettable movie watching moments.
3, S-terminal wire: an advanced analog signal
If AV cable is a symbol of the era of composite video, then S-terminal cable (Separate Video) is an important advancement in analog signal transmission. The S-terminal line is transmitted by separating brightness and chromaticity signals, and compared to composite video signals, it has significantly improved color reproduction and image clarity. Although the S-terminal wire has not completely freed itself from the constraints of analog signals, it has laid a solid foundation for later digital signal transmission. During the period when DVDs and early digital televisions were gradually becoming popular, S-terminal cables became the choice for many families pursuing higher picture quality.
4, VGA cable: an evergreen tree in the field of computer display
In the history of video cable development, VGA (Video Graphics Array) cable is undoubtedly an undeniable presence. It was originally designed as an analog signal transmission interface for computer monitors, connecting the computer host and monitor through a 15 pin D-type interface. VGA cable can transmit red, green, and blue primary color signals, as well as synchronization signals and horizontal and vertical scanning frequencies, thereby achieving image display. Although VGA cables have gradually been replaced by digital interfaces such as HDMI in the era of high-definition and 4K, they can still be seen on many old computers and monitors. The VGA cable has witnessed the entire process of personal computers from birth to popularization, and is a "living fossil" in the field of computer displays.
