Phase-locked loop for an electronic sectoring scheme for rotatin

Details Phase-locked loop for an electronic sectoring scheme for rotatin Phase-locked loop for an electronic sectoring scheme for rotatin

1976-07-12

1977-10-04

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data clocking

G11B 509

Patent

active

RE0294314

ABSTRACT:
In a rotating magnetic memory, a phase-locked loop tracks pulses derived from sector marks on means mechanically connected to rotate with the memory. The output frequency of the phase-locked loop, which is significantly higher by a factor of N than the frequency of the sector mark pulses, is cyclically counted down to divide each revolution of the memory into M equally time spaced sectors. Third and fourth order filtering in the phase-locked loop assures a high degree of precision and consistency in the sectoring.

REFERENCES:
patent: 3412385 (1968-11-01), Wang et al.
patent: 3778793 (1973-12-01), Hayashi et al.
patent: 3789379 (1974-01-01), Breikss

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