Dropout detection device for an optical type disc playback devic

Details Dropout detection device for an optical type disc playback devic Dropout detection device for an optical type disc playback devic

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

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