VDS Loss of Video Detector

The Burst Electronics Model VDS (and the VDS-3, a 3 channel version) detects the presence of composite video at its A input and outputs this video. If loss of video on the A input is detected, then the unit switches to the B input, lights a Red LED (VDS only), and energizes an internal "tally" relay (standard on VDS and VSA, optional on VDS-3). This relay may be used to control external devices. The tally relay has both normally closed and normally open contacts (Form C relay). The Model VSA includes stereo audio switching, audio follow video.

The video detection process utilizes a sophisticated sync separator circuit and a micro controller IC to analyze the A input. The composite sync tip amplitude, vertical sync, horizontal sync, and frame pulse are all analyzed by the micro controller to determine the quality of the incoming video on the A input.

The frame test allows progressive scan video signals (blue screen) and VCR search and pause modes to be detected as bad video.

Check out more details about VDS and other products from Burst Electronics.