The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 15, 1997
Filed:
Aug. 26, 1996
Clay Davis, Redondo Beach, CA (US);
The Todd-AO Corporation, Hollywood, CA (US);
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.