Research Of Closed Circuit Television Monitoring System Based On VBI Transmission

With the development of the broadcast technique, the application television which acts as an important branch in the NBTV field has great influence on the life. VBI (Vertical Blanking Interval) is a part of the limited resource of television, in which various digital signals can be inserted. More and more people begin to attach importance to its potence gradually.According to the basic principle of VBI, this paper acquires related experience from the advanced technique for delivering of control signals during the period of VBI. It introduces a scheme using a single coaxial-cable to transmit video signals and control signals simultaneously, in which the key technique is the transmission of control signals in the vertical blanking interval of video signals. In order to keep the signal transmission unfailing, BCH error-correcting code is applied in the system.This kind of system doesn't affect the application television broadcasting normally and doesn't increase video signal bandwidth additionally. It optimizes the transmission circuit for control signals and solves the problem of time-delaying, thereby it promotes the transmission more efficiently and economically.