Soundtrack interface for motion picture projector

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

G - Physics

03

B

G03B 31/02 (2006.01) G03B 31/00 (2006.01) G11B 7/003 (2006.01) G11B 7/135 (2006.01)

Patent

CA 2148532

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.

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