Recording or reproducing apparatus having a spindle servo contro

Details Recording or reproducing apparatus having a spindle servo contro Recording or reproducing apparatus having a spindle servo contro

1995-09-14

1997-11-25

Tran, Thang V.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 47, G11B 700

Patent

active

056919670

ABSTRACT:
A recording or reproducing device for a disc shape recording medium of the type having wobbled grooves includes a circuit for reproducing the recording medium, a circuit for extracting groove information, comparing the frequency of the groove information with a predetermined value, and determining from the comparison if the spindle servo is in a runaway state, and a control circuit which disables a PLL circuit in a spindle servo control if a runaway state is detected to thereby stop the runaway state.

REFERENCES:
patent: 4901300 (1990-02-01), Van Der Zande et al.
patent: 5065384 (1991-11-01), Yokogawa
patent: 5093820 (1992-03-01), Maeda et al.
patent: 5109369 (1992-04-01), Maeda et al.
patent: 5163035 (1992-11-01), Horikiri
patent: 5182741 (1993-01-01), Maeda et al.
patent: 5185732 (1993-02-01), Ogawa et al.
patent: 5315571 (1994-05-01), Maeda et al.
patent: 5528573 (1996-06-01), Shim

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