optical sound head

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optical sound head [′äp·tə·kəl ′sau̇nd ‚hed]

(electronics)

The assembly in motion picture projection which reproduces photographically recorded sound; light from an incandescent lamp is focused on a slit, light from the slit is in turn focused on the optical sound track of a film, and the light passing through the film is detected by a photoelectric cell. Also known as optical electronic reproducer.

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