Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1994-03-17
1995-11-21
Epps, Georgia Y.
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
369 47, 369 48, 369 58, 369 32, G11B 700
Patent
active
054694175
ABSTRACT:
An optical disk apparatus records data on an optical disk or reproduces data therefrom. The optical disk has a plurality of zones each including a plurality of tracks, and the optical disk apparatus records or reproduces data with respect to the zones on the basis of clock signals having different frequencies. The optical disk apparatus comprises first and second phase comparators. The first phase comparator is a pull-in type and outputs a signal corresponding to the phase difference between a clock signal generated by a PLL circuit and a binary signal of reproduction data. The second phase comparator is a lock-in type and outputs a signal corresponding to the phase difference between a signal obtained by frequency-dividing the clock signal generated by the PLL circuit and a signal obtained by frequency-dividing a fundamental clock signal. When data is to be recorded or when the timings at which the PLL circuit outputs clock signals are not appropriate, the clock signals of the PLL circuit are processed by a voltage controlled oscillator in accordance with a signal supplied from the pull-in type first phase comparator. When data is to be reproduced, the clock signals of the PLL circuit are processed by the same voltage controlled oscillator in accordance with a signal supplied from the lock-in type second phase comparator.
REFERENCES:
patent: 4672595 (1987-06-01), Senso
patent: 5210733 (1993-05-01), Yamaguchi et al.
patent: 5327300 (1994-07-01), Satomura
Tanoue Koki
Yokota Tsuneshi
Yoshimaru Tomohisa
Edun Muhammad N.
Epps Georgia Y.
Kabushiki Kaisha Toshiba
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