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It is synchronised mostly by "eye." There are some "blip" "blip" "bleeeeep" tests.... (a couple short sounds followed by a lengthy one... along with an electronically detectable flash... that are used to test for audio/video synch through a particular path. That path could be a satellite up and downlink or from a tv studio to master control. Generally, however, an editor or an audio engineer looks at the the lips moving on a subject and "slips" (delays) the audio until everything looks right.

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