G - Physics – 11 – B
Patent
G - Physics
11
B
352/32.2
G11B 7/00 (2006.01) H04N 5/76 (2006.01)
Patent
CA 1069214
ABSTRACT OF THE DISCLOSURE The present invention relates to a videodisc containing stored information in the form of frequency modulated intelligence. Prior art videodiscs have been made using recording procedures which record video signals in an amplitude varying with time format. As a result, small inaccuracies in the recording process produce low quality signals when read by playback appar- atus. Additionally, handling of the videodiscs of the prior art can easily destroy or adversely affect the quality of the reproduced signal. The present invention overcomes the deficiencies by providing an improved videodisc having its information stored in a unique manner which permits faithful recording and reproduction of a video signal in the face of minor processing in- accuracies and handling of the disc. In accordance with the invention, the videodisc contains information in the form of a carrier frequency having frequency changes with time varying from the carrier frequency. The videodisc has an upper surface carrying a lineal series of indicia positioned in track-like fashion on the sur- face. The indicia represents a frequency modulated intelligence signal. The lineal series of indicia includes regions of alternately high and low directional reflectivity normal to the surface of the disc. The regions of high directional reflectivity normal to the surface are areas of a metal coating on the disc, while the regions of low direction reflectivity normal to the surface are apertures in the metal coating.
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