Optics: motion pictures – With sound accompaniment – Methods
Patent
1998-06-16
2000-01-04
Metjahic, Safet
Optics: motion pictures
With sound accompaniment
Methods
352 11, 352 27, 352 37, G03B 3100, G03B 3102
Patent
active
060116102
ABSTRACT:
Dolby Digital and Sony SDDS digital signal carrying optical symbols on large-format motion picture film (e.g., film having any of the various 70 mm formats) are recorded in such a way as to permit existing 35 mm optical readers and signal decoders to recover the soundtracks with little or no modification. The conventional motion picture soundtrack in the form of a two-dimensional array of photographically recorded symbols representing digital information intended for application to 35 mm motion picture film is modified by magnifying the symbols in the direction in which the motion picture film is transported when played, the degree of magnification being proportional to the ratio of the film speed of the large-format motion picture film to the 35 mm film speed. The modified soundtrack is applied to the large-format motion picture film, whereby when said large-format motion picture film is played the information recovered is essentially the same as the information recovered from 35 mm motion picture film to which the conventional motion picture soundtrack is applied.
REFERENCES:
patent: 5639585 (1997-06-01), Callahan
patent: 5757465 (1998-05-01), Seagrave
Dolby Laboratories Licensing Corporation
Fuller Rodney
Gallagher Thomas A.
Metjahic Safet
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