Video signal routing system

摘要

A video signal routing system includes a video signal carrying line arranged in a loop beginning and ending at a signal multiplexer, a plurality of video cameras electrically connected to the line at points spaced therealong, and a video output line connected to receive video signals from the multiplexer. A synchronization signal insertion device and a code signal insertion device are located in the video signal carrying line adjacent the beginning of the loop between the multiplexer and the cameras. A duplicate synchronization signal insertion device and a duplicate code signal insertion device are located in the video signal carrying line adjacent the end of the loop between the multiplexer and the cameras. A timing generator and interface receives signals from a synch detector and a video level detector in the video output line and is controlled by a microcontroller. The microcontroller and the timing generator and interface control the synchronization signal insertion device, the code signal insertion device, the duplicate synchronization signal insertion device, and the duplicate code signal insertion device.