Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1987-03-23
1989-05-30
Richardson, Robert L.
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
358336, 358 54, 369124, G11B 700
Patent
active
048357588
ABSTRACT:
A dropout detection device for use in a device for playing back an optical disc such as a video disc and a Compact Disc comprises a four-split photodetector receiving laser beam through a disc on which information is recorded, a sum signal generation circuit for generating sum signals of output signals of two detectors positioned on diagonals of the four-split photodetector, and a dropout detection circuit for detecting difference in the waveform between two output sum signals of the sum signal generation circuit. A dropout in a reproduced signal is detected directly on the basis of result of detection by the dropout detection circuit without subjecting the reproduced signal to other signal processings so that a simplified circuit design can be realized.
REFERENCES:
patent: 3925605 (1975-12-01), Rennick
Richardson Robert L.
Yamaha Corporation
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