Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Synchronizing moving-head moving-record recorders
Patent
1976-11-04
1978-07-25
Wolff, John H.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Synchronizing moving-head moving-record recorders
G11B 2110
Patent
active
041033132
ABSTRACT:
A terminable scanning movement of a video tape track with respect to the scanning path of a playback head in a helical scan video recorder is provided with a staircase-type tracking control voltage. During each scanning cycle, in which each increment of the scanning voltage provides a monotonic, unidirectional translation of the tape track with respect to the scanning path by suitably altering the velocity of advance of the tape, the occurrence of a successive minimum and maximum in the resulting variation of detected video amplitude results in the generation of a stop signal. Such signal, which ideally coincides with the maximum amplitude of the detected voltage and thereby the desired registration position between the video tape track and the scanning path, is employed to stop the progression of the staircase voltage and to thereafter store the then-attained value for the maintenance of the tape drive servo at the optimum position.
REFERENCES:
patent: 3585291 (1971-06-01), Yamakawa
patent: 3845500 (1974-10-01), Hart
patent: 3905043 (1975-09-01), Frank
patent: 3943565 (1976-03-01), Frank et al.
Loewe-Opta GmbH
Wolff John H.
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