Phase-locked loop for an electronic sectoring scheme for...

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

G - Physics

11

B

352/19.5

G11B 5/09 (2006.01) H03L 7/093 (2006.01)

Patent

CA 1057851

ABSTRACT OF THE DISCLOSURE 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.

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