Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Synchronizing moving-head moving-record recorders
Patent
1978-09-25
1980-09-23
Cook, Daryl W.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Synchronizing moving-head moving-record recorders
318301, 360 73, 360 85, G11B 2704, G11B 1546, G11B 508, H02K 2720
Patent
active
042246431
ABSTRACT:
An automatic tracking servo control system which is adapted to control the tracking of at least one rotary signal reproducing transducer which scans successive parallel record tracks on a movable record medium. Position pulses are generated when the transducer rotates into predetermined position with respect to the record medium, and these position pulses are used in conjunction with control signals which are reproduced from the record medium and which had been recorded at spaced locations therealong in predetermined relation to the record tracks for controlling the position of the transducer with respect to the tracks scanned thereby. A detector detects the relative strength of the signal reproduced by the transducer during periodic intervals. A phase shift circuit shifts the phase of the position pulses by a selected amount during successive scanning cycles of the transducer, this amount being periodically adjusted as a function of the difference between the relative signal strengths in successive periodic intervals. The phase-shifted position pulses are used in a servo circuit, together with the control pulses, to control the tracking of the rotary head.
REFERENCES:
patent: 3663763 (1972-05-01), Trost
patent: 3663764 (1972-05-01), Trost et al.
patent: 3764755 (1973-10-01), Yamashita et al.
patent: 4003090 (1977-01-01), Beck
patent: 4004205 (1977-01-01), Yamamoto et al.
Nakamura Tadahiko
Nakano Kenji
Cook Daryl W.
Eslinger Lewis H.
Sinderbrand Alvin
Sony Corporation
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