Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Synchronizing moving-head moving-record recorders
Patent
1977-03-21
1979-05-01
Cardillo, Jr., Raymond F.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Synchronizing moving-head moving-record recorders
360 73, 360 77, G11B 2104, G11B 2110
Patent
active
041527348
ABSTRACT:
A method and apparatus is disclosed for use in a record/playback system for providing improved alignment between a transducer and a track on a recording medium on which track information has been recorded. The direction and magnitude of any misalignment between the transducer and the track is represented by an error signal. When the error signal indicates substantial alignment between the transducer and the track, a train of equally spaced pulses is generated. When the error signal indicates misalignment between the transducer and the track, at least one pulse is either added or deleted from the train of pulses, depending on the direction of misalignment indicated by the error signal. The pulse train is then used to generate a drive signal for effecting relative motion between the transducer and the track, the phase of the drive signal varying in response to the addition or deletion of pulses from the pulse train. The drive signal has a constant phase when the pulses are equally spaced, and has its phase altered in one of two selected directions when pulses are either added or deleted from the pulse train. By thus varying the phase of the drive signal, alignment between the transducer and the track is improved.
REFERENCES:
patent: 3126535 (1964-03-01), Streeter
patent: 3582541 (1971-06-01), Hebb
patent: 3585291 (1971-06-01), Yamakawa
patent: 3663764 (1972-05-01), Trost et al.
patent: 3764755 (1973-10-01), Yamashita
patent: 3905043 (1975-09-01), Frank
patent: 3943565 (1976-03-01), Frank et al.
Ampex Corporation
Cardillo, Jr. Raymond F.
Clay Robert G.
Mossino Ralph L.
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