Method and apparatus for locating a movable servo controlled...

Details Method and apparatus for locating a movable servo controlled... Method and apparatus for locating a movable servo controlled...

G - Physics

11

B

352/20, 342/6.4

G11B 17/02 (2006.01) G11B 5/54 (2006.01) G11B 5/55 (2006.01) G11B 7/085 (2006.01) G11B 21/08 (2006.01)

Patent

CA 1157941

Abstract As an aid in counting servo tracks in a position servo system, a position window detector (30) which normally provides coarse and fine pulses to counting logic (53) also provides fine pulses to a reset switch (45) of a tachometer signal integrator means (33), resetting the integrator once for each track. In the event of position signal drop-out wherein coarse pulses are not properly generated, a threshold detection means (43) senses when the output of the integrator reaches a threshold level and produces a threshold reached signal which is transmitted to counting logic means (53) for incrementing a track counter (61). 14

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