Apparatus for controlling rotation of a run length limited code

Details Apparatus for controlling rotation of a run length limited code Apparatus for controlling rotation of a run length limited code

1988-07-13

1989-09-05

Faber, Alan

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

360 7303, 369 59, 369240, G11B 700, G11B 1700

Patent

active

048645532

ABSTRACT:
A rotation control apparatus for controlling a rotation of a recording medium in which a signal modulated in a run length limited code has been recorded in concentric or spiral information tracks at a constant linear velocity. An inversion time detecting circuit alternately detects a maximum or minimum transition interval of a reproduced digital signal from its rise transition to its fall transition, and a maximum or minimum transition interval of the reproduced digital signal from its fall transition to its rise transition, so as to thereby produce a transition interval signal corresponding to each of the detected maximum or minimum values. A motor drive circuit drives a motor in such a direction as to reduce a difference between the value of the transition interval signal and a predetermined value.

REFERENCES:
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patent: 4423498 (1983-12-01), Kimura et al.
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patent: 4539666 (1985-09-01), Wachi
patent: 4611319 (1986-09-01), Naito
patent: 4623939 (1986-11-01), Machida et al.
patent: 4675855 (1987-06-01), Iso et al.
patent: 4700337 (1987-10-01), Inagawa et al.

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