Optics: motion pictures – With sound accompaniment – Common picture and sound record carrier systems
Patent
1994-11-09
1996-12-24
Adams, Russell E.
Optics: motion pictures
With sound accompaniment
Common picture and sound record carrier systems
352 37, G03B 3102
Patent
active
055877494
ABSTRACT:
Analog sound tracks are recorded on a single one of the three dye layers present in a color motion picture film, one of the same dye layers that is used for the color picture information. The single dye layer, preferably the cyan dye layer, is read out using a narrow spectrum, substantially monochromatic light source, preferably a red light-emitting diode (LED), the spectrum of which is such as to be maximally absorbed by the dye layer and to remain well within the absorption range of the dye layer even when the dye layer color characteristics vary among film batches. The resulting lower-cost and environmentally-safer silverless analog-audio soundtracks have playback characteristics extremely close to conventional analog audio soundtracks prepared with silver.
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Goldberg Paul R.
Richards Martin J.
Adams Russell E.
Dolby Laboratories Licensing Corporation
Gallagher Thomas A.
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