optical sound head

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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Debord achieves this remarkable effect by splicing optical track (which gives the white screen and audio) to what appeared to Assayas to be blank perforated magnetic tape--used at the time for sound editing--which is utterly opaque when passing through the gate of a film projector and utterly silent when passing through the optical sound head of a film projector.
Keith Sanborn and Greil Marcus on the films of Guy Debord: return of the supressed

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