Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1997-07-01
1999-11-09
Hindi, Nabil
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
331 1, 331 25, 369124, G11B 700, H03L 7099
Patent
active
059827246
ABSTRACT:
This invention prepares two control voltage to be input to a VCO circuit. The first control voltage is used to continuously change the oscillation frequency of the VCO circuit. The second control voltage is used to continuously change the first control voltage/oscillation frequency characteristics. The invention also includes a phase detecting circuit for comparing the phase of the data read from a disk with that of the output from the voltage-controlled oscillator, a frequency detecting circuit for comparing the frequency of the data read from the disk with that of the output from the voltage-controlled oscillator, a first filter circuit for passing signals representing the detection results obtained by the phase detecting circuit and the frequency detecting circuit, and a second filter circuit for extracting only a low-frequency component from the output from the first filter circuit. The output from the first filter circuit is used as the first control voltage. The output from the second filter circuit is used as the second control voltage. The second control voltage is changed to always keep the first control voltage at a predetermined voltage.
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Hayashi Yasuhiro
Mitani Kouichi
Hindi Nabil
Kabushiki Kaisha Toshiba
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