In the construction process of closed-circuit television monitoring system
, we often encounter image interference. It mainly including the image jitter, image distortion, snowflakes, horizontal ripple rolling up and down and so on. Before solving the problems of image interference, we should first determine the source of interference, and then prescribe the right medicine.
At present, there are two main types of signal transmission in the closed-circuit television monitoring system: one is analog video signal which is transmitted from the camera to the matrix by the cable, and then transmitted to the display and hard disk recorders by the matrix; the other one is the digital signal which is control signal transmitted between the decoder and the matrices. In the normal operation of the equipment, there will be no interference on the video signal. We have not found problems about interfere with the video caused by the control in the current construction.
How the interference is generated? The following example may help you. The elevator movements, high-power motor start, microwave, power and other elements will interfere the low-frequency analog signals. You should use different methods or equipment to solve problems according to different sources of interference.