Optical Sound Definition - Creative Glossary

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Creative Glossary > Film > Optical Sound

Term Details
Term:	Optical Sound
Subcategory:	General
Definition:	The system utilized by a projector to play back a film print’s sound; the sound is exposed onto the film as a translucent modulating line over black. The track is read by the projector by putting it through an exciter lamp. The voltage of the lamp is then amplified and fed through a speaker to project it.

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