Disc drive servo system

Details Disc drive servo system Disc drive servo system

1982-12-21

1984-12-04

Psitos, Aristotelis M.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

358342, G11B 2110

Patent

active

044867956

ABSTRACT:
A disc drive servo system for controlling the drive of a disc carrying a binary digital signal wherein the digital signal includes (i) an information signal portion in which the position of an inversion of the digital signal is determined in accordance with an analog information signal and (ii) synchronizing signal portions which include two successive maximum periods of the inversion. The system comprises a timer means for initialing a timing operation upon receipt of an inversion signal and for producing an output signal when no inversion occurs during a time period which is twice as long as the maximum period of the inversion, thereby reproducing a synchronizing signal and ensuring precise control of the disc drive speed even during periods in which the production of a clock signal is not possible.

REFERENCES:
patent: 3524164 (1970-08-01), Cox et al.
patent: 3911484 (1975-10-01), Mutou et al.
patent: 4308557 (1981-12-01), Dieterich
patent: 4338640 (1982-06-01), Yabu et al.

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