Genlock (for Generator Lock) is a common technique where the video output of one source, or a specific reference signal, is used to synchronize other television picture sources together. The aim in video and digital audio applications is to ensure the coincidence of signals in time at a combining or mixing or switching point. When sources are synchronized in this way, they are said to be genlocked

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Video Picture-in-Picture (PIP), Video Inset System, Video Picture-on-Picture (POP) - Model 612S
Video Screen Splitter, Video Split Screen, Video Wiper 613 Series
Video Signal or Image Mixer, Video Dissolver, Video Fader, Video Combiner - 614G Series
Video Screen Splitter, Video Split Screen, Video Wiper 616 Series