G - Physics – 11 – B
Patent
G - Physics
11
B
352/32.2
G11B 7/00 (2006.01) H04N 5/76 (2006.01)
Patent
CA 1055157
ABSTRACT OF THE DISCLOSURE The present invention relates to reading while writing on an information storage videodisc. Prior art techniques of recording on videodiscs have involved processing procedures producing recorded intelligence information on a disc directly from a corresponding intelligence signal in amplitude varying with time format. Such procedures have definite limitations as to the quality of the reproduced signal. Additionally, it has previously not been possible to instantaneously read and check the recorded signal. In accordance with the present invention, a writing system includes an apparatus for recording information on a videodisc having a light responsive coating covering the videodisc sub- strate for retaining indicia representing a frequency modulated information signal. A light beam of sufficient intensity is provided to interact with the responsive coating of the videodisc forming the indicia representing the information signal. A reading system is provided and includes a reading beam directed along an optical path between a reading light source and the videodisc. The reading beam is of sufficient intensity to generate reflections from the indicia on the videodisc. A light-sensor is responsive to the reflections for gener- ating a frequency modulated signal having its information content in the form of a carrier frequency which has frequency changes with time. The reading while writing apparatus and method provides a comparative system for analyzing the initial frequency modulated signals used in writing on the videodisc to the actual frequency m odulated signal produced in reading the videodisc.
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