Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Synchronizing moving-head moving-record recorders
Patent
1978-09-07
1980-07-01
Konick, Bernard
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Synchronizing moving-head moving-record recorders
360 73, 360 77, G11B 2110, G11B 1546
Patent
active
042109434
ABSTRACT:
An automatic tracking servo control system which is adapted to control the tracking of at least one rotary signal reproducing head which scans successive parallel record tracks on a movable record medium. Position pulses are generated when the at least one head 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 at least one head with respect to the tracks scanned thereby. A detector detects the relative strength of the signal reproduced by the at least one head during periodic intervals. A phase shift circuit shifts the phase of each reproduced control signal as a function of the difference between the relative signal strengths in successive periodic intervals. The phase-shifted control signal is used in a servo circuit, together with the position pulses, to control the tracking of the rotary head.
REFERENCES:
patent: 3654387 (1972-04-01), Louth
patent: 3663763 (1972-05-01), Trost
patent: 3663764 (1972-05-01), Trost
patent: 3764755 (1973-10-01), Yamashita
patent: 4104684 (1978-08-01), Wakami
patent: 4127881 (1978-11-01), Wakami
Nakamura Tadahiko
Nakano Kenji
Eslinger Lewis H.
Faber Alan
Konick Bernard
Sinderbrand Alvin
Sony Corporation
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