Frame synchronizer

A frame synchronizer is a device used in live television production to match the timing of an incoming video source to the timing of an existing video system. They are often used to "time in" consumer video equipment to a professional system but can be used to stabilize any video. The frame synchronizer essentially takes a picture of each frame of incoming video and then outputs it immediately with the correct synchronization signals to match an existing video system.
See more at Wikipedia.org...