Color movie film noise reduction system

Details Color movie film noise reduction system Color movie film noise reduction system

1979-02-05

1980-11-25

Hix, L. T.

Optics: motion pictures

With sound accompaniment

Common picture and sound record carrier systems

1791003K, G03B 3102, G11B 700

Patent

active

042355311

ABSTRACT:
Sound is recorded on color movie film using conventional techniques preferably by variations in density and printed in color such as cyan. Noise reduction on playback is achieved by utilizing a light source generating frequencies capable of being modulated by the color of the sound track and preferably high in infrared frequencies. The infrared frequencies do not see the color sound track but are responsive to noise and other impurities. The modulating signal will be affected by both the colored sound track and impurities. All light frequencies passing through the sound track are directed to a filter such as a dichroic cold mirror which passes the IR frequencies to a first detector and reflects the sound track modulated signal plus noise to a second detector. Apparatus is described for algebraically combining the output of both detectors to thereby cancel the effects of the noise signal from the desired sound track modulated signal.

REFERENCES:
patent: 3407272 (1968-10-01), Barocela
patent: 3513268 (1970-05-01), John, Jr.
patent: 3903360 (1975-09-01), Kamisaka et al.
patent: 3969593 (1976-07-01), Vlahos

Affiliated with

Also associated with

Rating

Color movie film noise reduction system does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Color movie film noise reduction system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Color movie film noise reduction system will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1127173