Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1980-03-07
1981-09-01
Konick, Bernard
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
328149, 369 71, 369 72, 369126, G11B 358
Patent
active
042875870
ABSTRACT:
A video disc playback system includes a circuit for detecting degradation in signals recovered from a disc and generates a control pulse responsive to the detected degradation. The degradations are of a predetermined duration and represent a predetermined percentage decrease in amplitude. A peak detecting and following circuit is connected for receiving signals recovered from the disc record. The decay rate of the peak detecting circuit is arranged to be substantially equal to a certain minimum duration of amplitude degradations that should occur before it is desired to generate the control pulse. The output signal from the detector circuit is proportioned by a divider circuit and then integrated to produce a signal which is proportional to the average of the detected signal over a relatively long period of time. The proportioned signal is applied to the reference signal terminal of a comparator circuit and the detected signal is applied to the signal input terminal of the comparator. The comparator is conditioned to change states when the detected signal falls below the proportioned signal.
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"Linear Application Handbook", National Semiconductor Corp., Santa Clara, CA, 1978, pp. AN48-8 to 11.
"Capacitive Pickup and the Buried Subcarrier Encoding System for the RCA Videodisc", J. K. Clemens, RCA Review, vol. 39, Mar. 1978.
Nosker Richard W.
Simshauser Elvin D.
Herrmann E. P.
Konick Bernard
McElheny Jr. Donald
RCA Corporation
Tripoli J. S.
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