Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1998-04-13
2000-09-12
Psitos, Aristotelis M.
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
G11B 2722
Patent
active
061187429
ABSTRACT:
If a determination is made that a signal is not normally detected by the pre-pit-region detection circuit 53, an error signal is obtained from a pulse generator 58 to control the rotations of the disk 50. If a determination is made that a signal is normally detected by the pre-pit-region detection circuit 53 and if the synchronizing signals are not normally detected at predetermined intervals, an error signal is obtained from the wobble signal so that the rotations of the disk 50 are controlled. If a determination is made that synchronizing signals are detected by the pre-pit-region detection circuit 53 at predetermined intervals, an error signal is obtained from clocks synchronized with the reproduced signal generated by the PLL circuit 54 so that rotations of the disk 50 are controlled.
REFERENCES:
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patent: 4841511 (1989-06-01), Suzuki et al.
patent: 5220551 (1993-06-01), Tateushi et al.
patent: 5745457 (1998-04-01), Hayashi et al.
patent: 5745460 (1998-04-01), Tateishi
Hiratsuka Yukari
Kizu Naoki
Matsui Shigeru
Sugiyama Kazuhiro
Yashima Noboru
Mitsubishi Denki & Kabushiki Kaisha
Psitos Aristotelis M.
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