Control apparatus for a recording medium drive motor in a digita

Details Control apparatus for a recording medium drive motor in a digita Control apparatus for a recording medium drive motor in a digita

1985-09-26

1987-10-13

Psitos, Aristotelis M.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

360 59, 360240, G11B 702, G11B 1700

Patent

active

047003375

ABSTRACT:
A control apparatus for a recording medium drive motor in a digital information reproducing apparatus. The apparatus controls a rotation speed of the recording medium at a prescribed constant linear velocity in using a reproduced signal from the medium without employing a detector for detecting the position of a pick-up device used therein and without being affected by an unexpected level change of the reproduced signal. The apparatus includes a motor for driving the recording medium having a digital information recorded thereon in the form of a run length limited pulse code modulation, a pick-up for reproducing a digital signal from the recording medium driven by the motor, a detector for detecting a predetermined limited cycle length of the digital signal from the reproduced signal by the pick-up, and a controller for controlling the rotation speed of the motor so that the limited run length of the reproduced digital signal is kept at a predetermined value.

REFERENCES:
patent: 4338683 (1982-07-01), Furukawa et al.
patent: 4397011 (1983-08-01), Ogawa
patent: 4466089 (1984-08-01), Wachi
patent: 4539666 (1985-09-01), Wachi
patent: 4543650 (1985-09-01), Wachi

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