Digital head position controller with triangle wave comparison

Details Digital head position controller with triangle wave comparison Digital head position controller with triangle wave comparison

1986-08-08

1988-05-17

Cardillo, Raymond F.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

G11B 2110, G11B 5596

Patent

active

047454970

ABSTRACT:
Head position controlling system for a disc memory unit in which reference information recorded on a recording disc is read out by a head to control tracking of the head. In the case of recording data on the recording disc, a first repetitive pattern signal is recorded on the disc while maintaining a predetermined position relationship with respect to a pair of adjacent data tracks to form an N-th reference track on the disc and then a second repetitive pattern signal is recorded on the disc to form (N-1)-th and (N+1)-th reference tracks adjacent to the N-th reference track. The second repetitive pattern signal is shifted in position so as not to be adjacent to the first repetitive pattern signal. In the case of reading out data recorded on the disc, the head sequentially reads out the first and second repetitive pattern signals from the pair of adjacent reference tracks and then the respective numbers of pattern signals of the first and second repetitive pattern signals exceeding a threshold level of a ramp signal generated in synchronism with the read-out operation is extracted. Subsequently, the position of the head is detected in accordance with the difference between the respective numbers.

REFERENCES:
patent: 4157577 (1979-06-01), Porter, Jr. et al.
patent: 4530019 (1985-07-01), Penniman

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