Phase lock loop for sector servo system

Details Phase lock loop for sector servo system Phase lock loop for sector servo system

1991-09-27

1992-09-08

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 14, 331 25, 331 27, 360 7705, 360 7706, 360 7708, G11B 5596, G11B 2110, H03L 708

Patent

active

051461838

ABSTRACT:
A phase lock loop for a sector servo system. A servo phase lock loop oscillator provides the control timing function of the servo. Initially, the PLO is locked in frequency to a frequency reference obtained from a counter/timer in a digital signal processor (DSP) used to control the servo system. Subsequent to acquisition of the nominal operation frequency, the PLO is caused to lock in turn to gap and frame character markers derived from the digital information encoded into the servo burst. Transition between PLO reference sources is commanded by the microprogram running in the DSP, based upon microprogram assessment of servo PLO status. The PLO outputs timing control tags to the servo control logic and PES demodulator, a reference clock to the file read/write channel, and interrupt pulses to the DSP to synchronize DSP operation with the servo hardware, and initiate periodic DSP computation of the control algorithm.

REFERENCES:
patent: 4297734 (1981-10-01), Laishley et al.
patent: 4901035 (1990-02-01), Cleveland
patent: 5089757 (1992-02-01), Wilson

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