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How Closed Circuit Television Works
- Jan 07, 2019 -

Closed-circuit television is in contrast to television broadcasts on television.

The broadcast is divided into two types: wireless broadcast and cable broadcast. The open broadcast of the TV station is equivalent to wireless broadcast (the user obtains the TV signal from the antenna), and the closed circuit television is equivalent to the cable broadcast (the cable TV mode: the TV signal is transmitted from the satellite transmission end through the cable to the cable Specify user). It transmits TV signals through wires. It mainly converts audio and video signals into a certain radio frequency signal (ie, a certain channel) so that it can be transmitted in a closed circuit television system.

Closed-circuit television generally refers to televisions other than broadcasting, such as industrial television, military television, medical television, underwater television, and the like.