Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Synchronizing moving-head moving-record recorders
Patent
1991-05-16
1993-10-19
Zazworsky, John
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Synchronizing moving-head moving-record recorders
360 7307, 360 7713, 358321, 358338, G11B 15467, G11B 2104
Patent
active
052551342
ABSTRACT:
An auto-tracking system for a helical scan type magnetic recording/reproducing unit comprises a synchronizing signal separating circuit from video signals on a running magnetic tape reproduced by a rotary video head, a periodicity variation measuring and comparing circuit in the synchronizing signals separated in the synchronizing signal separating circuit, and a tracking control means which controls the running condition of the magnetic tape with reference to a phase difference between a reference signal in association with the rotary video head and a signal representing the running condition of the magnetic tape and changes tracking by a predetermined amount in response to the periodicity variation measured by the measuring and comparing circuit so as to minimize the periodicity variation measured by the same, thereby an optimum tracking position is obtained without being interfered by cross-talks between the adjacent tracks.
REFERENCES:
patent: 3845500 (1974-10-01), Hart
patent: 4210943 (1980-01-01), Nakamura et al.
patent: 4255768 (1981-03-01), Kubota
patent: 4607298 (1986-08-01), Yamashita
patent: 4920435 (1990-04-01), Yamazaki
patent: 5119246 (1992-06-01), Tomitaka
Hiramatsu Kiyoshi
Ohta Hisashi
Sekiya Masataka
Usami Hideyuki
Hitachi , Ltd.
Zazworsky John
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