Dynamic information storage or retrieval – Information location or remote operator actuated control – Selective addressing of storage medium
Patent
1992-06-24
1994-03-01
Pascal, Robert J.
Dynamic information storage or retrieval
Information location or remote operator actuated control
Selective addressing of storage medium
369 4425, 369 4428, 369 54, 369 4434, 360 7804, 360 7805, 360 7807, 360 7811, G11B 1722, G11B 3302, G11B 700
Patent
active
052914640
ABSTRACT:
A speed and position control apparatus comprising: an encoder generating two-phase signals having a 90-degree phase difference to correspond to a movement of a carrier; and adder obtaining a sum of phase signals; a subtracter obtaining a subtraction of phase signals; a circuit making bi-leveled signals from the sum and subtraction signals; a circuit obtaining an exclusive OR signal based on the bi-leveled signals; a circuit generating differential signals of respective phase signals; a first selector selecting either of the differential signals by the exclusive OR signal; a first switch selectively outputting an output of the first selector or its opposite-polarity output signal based on the bi-leveled subtraction signal; a second selector selecting either of the respective phase signals by the exclusive OR signal; a second switch selectively outputting an output of the second selector or its opposite-polarity output signal based on the bi-leveled subtraction signal; a device inputting an AC component of the second switch output signal to a sample and hold circuit; and a device returning an output of the sample and hold circuit, which holds a sample value inputted during a predetermined period of time in response to a building-up of the exclusive OR output signal, to its input terminal so as to realize a DC restoration.
REFERENCES:
"An electronic tach for disk file motion control" by R. K. Oswald, IEEE Trans. on Magnetics, vol. MAG-11 No. 5, Sep. 1975.
"Design of a disk file head-positioning servo" by R. K. Oswald, IBM, J. Res. Develop. Nov. 1974.
Kinkead Arnold
Pascal Robert J.
Victor Company of Japan Ltd.
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