Tracking control circuit using a delayed tach signal

Details Tracking control circuit using a delayed tach signal Tracking control circuit using a delayed tach signal

1975-04-11

1976-05-18

Konick, Bernard

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Synchronizing moving-head moving-record recorders

360 75, 360 77, 318314, G11B 2104, G11B 2110

Patent

active

039582710

ABSTRACT:
In a video tape recorder in which a video signal is recorded on a magnetic tape as a plurality of skewed tracks by a rotary magnetic head which is rotated in synchronism with a frame frequency signal contained in the video signal and in which a recorded video signal is reproduced by the rotary magnetic head from a magnetic tape on which a control signal representing the frame frequency has also been recorded, there is provided a detecting device which detects the time when the rotary magnetic head rotates in contact with the magnetic tape to a point beyond that corresponding to where the frame frequency signal in the video signal is recorded. The output signal from the detecting device is applied to a variable delay circuit. A signal obtained by phase-comparing the output signal from the delay circuit with a signal reproduced by a fixed magnetic head from the control signal recorded on the magnetic tape is used to control the rotating phase of the rotary magnetic head and/or a drive for moving the magnetic tape.

REFERENCES:
patent: 3358080 (1967-12-01), MacLeod
patent: 3384708 (1968-05-01), Stosberg
patent: 3600508 (1971-08-01), Dann
patent: 3662098 (1972-05-01), Yano
patent: 3705840 (1972-12-01), Kosugi

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