H - Electricity – 04 – N
Patent
H - Electricity
04
N
352/32.2
H04N 5/76 (2006.01) G11B 7/00 (2006.01)
Patent
CA 1066414
ABSTRACT OF THE DISCLOSURE The present invention relates to the storage of information upon a videodisc. Prior art attempts at storing video information on a disc have involved processing procedures producing recorded intelligence information on a disc directly from a corresponding intelligence signal in amplitude varying with time format. The present invention provides an improved apparatus and method for reliably storing information on a videodisc in the form of a carrier frequency having frequency changes with time varying from the carrier frequency. In accordance with the invention, a video- disc having a light responsive coating covering the disc substrate is provided, and a light source produces a light beam of sufficient intensity to interact with the responsive coating of the videodisc as the disc rotates. An optical system defines an optical path between the light source and the responsive coating on the disc for focusing the light beam on the coating. A light intensity modulator, responsive to the informa- tion signal, is positioned in the optical path for intensity modulating the light beam. The beam passing through the intensity modulator and optically focused on the responsive coating on the disc forms an informa- tion track of indicia representing the frequency modu- lated information signal. The information signal and altered coating of the disc contain intelligence in- formation in the form of a carrier frequency varying in frequency as a function of time.
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