... 光路，光束路径：beam path 光录声迹：optical sound track 光录声机：photographic sound recorder ...
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光学声迹 : optical sound track; photographic trac ..
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optical sound track positive 光学声迹正片
optical sound track negative 光学声迹负片
optical sound track printing 光学声迹印片
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But, starting in the nineteen-thirties, music soundtracks were added to silents, and the films needed to move through the projector at twenty-four frames a second, so that the optical sound reader could handle the music track.
NEWYORKER: The Artists
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