Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1997-05-09
1999-11-30
Psitos, Aristotelis M.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 7712, G11B 558
Patent
active
059953152
ABSTRACT:
A servo system positions a read head for following a magnetic tape track by determining position information from a composite signal read from the tape by the read head. The servo system includes the read head, a discriminator circuit that provides a drive signal in response to the composite signal, and a head positioner that moves the read head in response to the drive signal. One frame of the composite signal in one embodiment includes four sync pulses followed by four position pulses. Sync pulses have a pulse width less than the pulse width of position pulses. The discriminator includes range check circuits that validate sync and position pulses and includes an arithmetic circuit that determines a ratio of sync-to-position time divided by sync-to-sync time. The discriminator provides the drive signal in response to a moving average of such ratios.
REFERENCES:
patent: 4873518 (1989-10-01), Mehnert
patent: 4897746 (1990-01-01), Saito
patent: 4979051 (1990-12-01), Eggebeen
patent: 5689384 (1997-11-01), Albrecht et al.
Davidson Dan I.
Hewlett--Packard Company
Psitos Aristotelis M.
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