Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1991-05-21
1993-07-20
Psitos, Aristotelis
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
369 58, 369 59, 369124, G11B 390, G11B 700
Patent
active
052299856
ABSTRACT:
A data recording/reproducing apparatus for recording/reproducing data by use of a recording medium comprises a detector for receiving light beams from a predetermined portion of the recording medium and outputting a corresponding reproduction signal. A first measuring unit measures a time period during which an average level of the reproduction signal output from the detector exceeds a reference value, and outputs a first measurement signal. A second measuring unit measures the number of times, at which an interval of pits recorded on the recording medium meets a predetermined modulation rule, by use of the reproduction signal, and outputs a second measurement signal. A discriminating unit discriminates the recording state of the predetermined portion of the recording medium, on the basis of the first and second measurement signals.
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Huber P. W.
Olympus Optical Co,. Ltd.
Psitos Aristotelis
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