optical sound

noun Movies.
sound recorded on and subsequently played back from an optical or photographic soundtrack, as opposed to a magnetic soundtrack.

Origin:
1930–35

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World English Dictionary
optical sound
 
n
sound recorded in the form of a photographic image on cinematograph films

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
At the same time the nitrate optical sound track is rerecorded on magnetic tape and a safety optical negative produced.
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