BNC and RCA are very common video and audio signal transmission interfaces, we can often see them in life, such as VCD, DVD player, high-definition LCD TV, security video surveillance equipment, etc. They also have two nicknames, called coaxial cable connectors and lotus connectors. But few people can understand the characteristics of the two common signal transmission interfaces very well, let's take a look together.
The BNC connector is different from the special display interface of the ordinary 15-pin D-SUB standard connector. It is composed of RGB three primary color signals and five independent signal connectors for horizontal synchronization and vertical synchronization. Mainly used to connect workstations and other systems that require high scanning frequency. The BNC Connector can isolate the video input signal, reduce the interference between the signals and the signal bandwidth is larger than that of the ordinary D-SUB, which can achieve the best signal response effect.
The RCA terminal adopts the coaxial signal transmission method, the central axis is used to transmit the signal, and the contact layer on the outer edge is used for grounding, which can be used to transmit digital audio signals and analog video signals. RCA audio terminals are generally marked in different colors in pairs: red for the right channel and black or white for the left channel. Sometimes, the center and surround channel cables will be marked with other colors to facilitate the distinction when wiring, but all the RCA connectors in the entire system are the same in terms of electrical performance. Generally speaking, the RCA stereo audio cable is a set of left and right channels, and each channel is a line in appearance.