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Genlocking A technique where the video output of one source is used to synchronise other video 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 synchronised in this way, they are said to be genlocked. Genlock can be used to synchronise as few as two isolated sources (e.g. a television camera and a videotape machine feeding a vision mixer, also known as a production switcher in North America), or in a wider facility where all the video sources are locked to a single synchronising pulse generator (e.g. a fast paced sporting event featuring multiple cameras and recording devices).