Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1976-10-26
1978-12-19
Eddleman, Alfred H.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
G11B 2110, G11B 558
Patent
active
041308441
ABSTRACT:
In a tracking system using an error signal derived from recorded dipulses of opposing polarity on each side of the center of a data track recorded on a magnetic medium, the need for highly accurate signal integration is avoided by partially integrating the dipulse signal, and then integrating the partially integrated signal above a predetermined threshold. The resulting double-integrated signal provides an error signal substantially unaffected by DC and noise offsets. A double-ended average pulse detector with feedback using a double-ended "current mirror" to carry out the described method is disclosed.
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patent: 3250903 (1966-05-01), Vasu et al.
patent: 3412300 (1968-11-01), Westenskow
patent: 3534344 (1970-10-01), Santana
patent: 3593333 (1971-07-01), Oswald
patent: 3838457 (1974-09-01), Palmer
patent: 3893180 (1975-07-01), Braun et al.
patent: 3905043 (1975-09-01), Frank
patent: 4014040 (1977-03-01), Kornhass
Eddleman Alfred H.
Smith Barry Paul
Xerox Corporation
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