Access control apparatus

Details Access control apparatus Access control apparatus

1988-01-28

1989-09-19

Stephan, Steven L.

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 33, 369 44, G11B 555

Patent

active

048688193

ABSTRACT:
An access control apparatus for use with a disc drive having a head provided for movement with respect to tracks on a disc to produce a reproduced signal containing a data signal. The access control apparatus includes a drive device for moving the head in a direction radially of the disc to perform rapid access from one track to a desired track. A traverse detector is provided for producing traverse detection pulses in response to the data signal. The traverse detector includes a trigger signal generator responsive to the data signal for producing trigger pulses for respective cycles of the data signal having a magnitude greater than a predetermined value and a timer responsive to each of the trigger pulses for changing to a first state. The timer returns to a second state a predetermined time afer each the trigger pulse occurs. A counter counts the traverse detection pulses to accumulate a count corresponding to the number of tracks traversed by the head. The drive device is controlled in accordance with the count of the counter.

REFERENCES:
patent: 4464689 (1984-08-01), Probst
patent: 4479194 (1984-10-01), Fogg et al.
patent: 4488098 (1984-12-01), Shimonou
patent: 4677507 (1987-06-01), Elliott
patent: 4774699 (1988-09-01), Giddings
patent: 4779252 (1988-10-01), Custers et al.

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