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Multichromatic Optical Film Recording of Multiple Signals

IP.com Disclosure Number: IPCOM000091155D
Original Publication Date: 1969-Nov-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Davidge, RV: AUTHOR [+2]

Abstract

A spectrum separation technique enables recording and reproducing of several signals on a single space or track of color film. The recording apparatus is at A. It makes use of film 1 having base la and N emulsions or color layers 2, each of which is sensitive to a given frequency of light. Light from sources 3 is focused on film 1 through an aperture in plate 4 by lenses 5. Each source can contain an appropriate filter to generate light of a frequency that sensitizes one of the color emulsions of the film. N signals, which are to be recorded, drive the light sources by signals on lines 6.

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Multichromatic Optical Film Recording of Multiple Signals

A spectrum separation technique enables recording and reproducing of several signals on a single space or track of color film. The recording apparatus is at A. It makes use of film 1 having base la and N emulsions or color layers 2, each of which is sensitive to a given frequency of light. Light from sources 3 is focused on film 1 through an aperture in plate 4 by lenses 5. Each source can contain an appropriate filter to generate light of a frequency that sensitizes one of the color emulsions of the film. N signals, which are to be recorded, drive the light sources by signals on lines 6.

The reproducing facilities are at B. Light from source 7, which has a wide- band special output, is focused on film 1, now developed, through condensing lenses 9. Light transmitted through film 1 and objective lens 10 is broken into a spectrum by prism 11. Photorecepters 12 are oriented on the spectrum so that each receives the light corresponding to one of the recorded signals. The N signal outputs appear on lines 13. Alternately, photorecepters of various spectral sensitivities or a system of filters can be used.

In a typical application, several audio signals can be recorded on the same track. Ordinary color film has three color emulsion layers. Thus, three audio signals can be placed on the same track. The method can also be used to record digital information with each signal corresponding to a bit of a character. Thi...