Find the output interface in the AV interface behind the TV, and then connect the audio and video to the closed circuit, that is, connect the audio and video signals of the TV to the closed circuit, so that the TV signal can be added to the closed circuit. Connect the closed-circuit audio and video signals to the AV input interface on the back of the TV, and you can watch the closed-circuit signals with the TV.
Closed circuit TV is also called cable TV line. First of all, CCTV refers to a video monitoring system used for monitoring a certain unit or area. Broadband RF signal (55 MHz- 1000 MHz) is transmitted in CATV network, and its signal transmission, amplification and distribution is a complex process with high technical content.