Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1991-10-25
1994-01-04
Psitos, Aristotelis
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
369 48, 369 59, 307359, 307265, G11B 700, H03K 5153
Patent
active
052766640
ABSTRACT:
A reproducing apparatus for reproducing plural types of optical discs comprising: a comparator for digitizing a reproduced signal obtained by reproduction of a first optical disc which is to be reproduced under a first optical condition defined by a first reproducing reference under a second optical condition defined by a second reproducing reference applied to reproduction of a second optical disc having a recording density higher than that of the first optical disc, the comparing operation of the reproduced signal with a reference voltage different from that defined by the first reproducing reference; and a pulse length correction circuit for correcting a pulse length of a digital signal outputted from the comparator such that the pulse length of the digital signal is equal to another pulse length which would be obtained by digitizing another reproduced signal using the reference voltage defined by the first reproducing reference, the another reproduce signal being obtained by reproducing the first optical disc in accordance with the first reproducing reference.
REFERENCES:
patent: 4646103 (1987-02-01), Sugiyama et al.
patent: 4731773 (1988-03-01), Lewkowicz
patent: 4788674 (1988-11-01), Maeda et al.
patent: 5008669 (1991-04-01), Ishibashi et al.
patent: 5111443 (1992-05-01), Yokogawa
Hindi Nabil
Psitos Aristotelis
Victor Company of Japan Ltd.
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