Sound system for compact distribution print

Details Sound system for compact distribution print Sound system for compact distribution print

1996-08-26

1997-04-15

Metjahic, Safet

Optics: motion pictures

With plural picture sizes and types

352 80, 352 5, G03B 3100, G03B 4100

Patent

active

056214901

ABSTRACT:
A system is provided for treating sound represented by the varying width of a motion picture film soundtrack, which provides a "flat" frequency response up to 12.5 kHz with maximum phase coherence, even though the film speed is only 62% to 78% of the present speed of 90 feet per minute. The projector photocell which detects a slit-shaped area of light passing through the soundtrack, produces an output that is amplified so the amplification is progressively greater at higher frequencies, with the gain at 12.5 kHz being at least 6 dB greater than at 1 kHz. A photocell is selected whose output at 12.5 kHz is within 1 dB of its output at 1 kHz for light of a wavelength of substantially 1000 nanometers.

REFERENCES:
patent: 3682540 (1972-08-01), Oxberry et al.
patent: 3865738 (1975-02-01), Lente
patent: 4085296 (1978-04-01), Keegan
patent: 4124784 (1978-11-01), Johnson et al.
patent: 4355383 (1982-10-01), Dolby
patent: 4577231 (1986-03-01), Allen
patent: 4900293 (1990-02-01), McLendon
patent: 5231627 (1993-07-01), Paul et al.
patent: 5479223 (1995-12-01), McLendon et al.
patent: 5534954 (1996-07-01), Vetter

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