Soundtrack interface for motion picture projector

Details Soundtrack interface for motion picture projector Soundtrack interface for motion picture projector

1994-05-17

1996-01-09

Adams, Russell E.

Optics: motion pictures

Removable film strip magazine type

352 27, G03B 3102

Patent

active

054833060

ABSTRACT:
A soundtrack interface for a motion picture projector allows the projector to sense dye only soundtracks or silver soundtracks. The system includes: a) an infrared filter: b) means for moving the infrared filter into the optical path between the sound system light source and photo detector when a film having a dye only soundtrack is to be projected, and for moving the infrared filter out of the optical path when a film having a silver soundtrack is to be projected; c) a preamplifier; and d) means for switching the preamplifier into a circuit between the photo detector and the sound amplifier when a film having a dye only soundtrack is to be projected and out of the circuit when a film having a silver soundtrack is to be projected.

REFERENCES:
patent: 3964826 (1976-06-01), Joseph et al.
patent: 3969593 (1976-07-01), Vlahos
patent: 4235531 (1980-11-01), McCormack
patent: 4367930 (1983-01-01), Kolb, Jr.

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