photographic sound reproducer

photographic sound reproducer

[¦fōd·ə¦graf·ik ′sau̇nd ‚rē·prə‚düs·ər]
(electronics)
A sound reproducer in which an optical sound record on film is moved through a light beam directed at a light-sensitive device, to convert the recorded optical variations back into audio signals. Also known as optical sound reproducer.
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