If audio technology (radio, etc) developed sooner than video technology, how come early movies were silent?
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Because the difficulty at the time didn’t come from recording either one separately but getting them to be in synchronisation. Early sound recording was done on one medium, film on another, then the two added together on one film print. To get things like speech looking natural by following lip movements, you need the two to be inside a tenth of a second or so difference.
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