Track scan initiation and cutout arrangement for a helical scan

Details Track scan initiation and cutout arrangement for a helical scan Track scan initiation and cutout arrangement for a helical scan

1974-09-25

1976-03-09

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 2104, G11B 2110

Patent

active

039435652

ABSTRACT:
An arrangement for initiating and terminating a scanning movement of a video tape track with respect to the scanning path of a playback head is described for use in a helical scan video recorder. A disturbance detector is actuated when the detected video pulse envelope exceeds a predetermined amplitude indicative of a minimum displacement of the track from the scanning path. Such actuated detector operates to couple the servo unit of the tape velocity regulator to a tracking controller. The controller initiates a track scanning operation by applying to the tape drive servo a cyclic modulation which is superimposed upon an error signal derived from the detected video envelope. At the conclusion of a predetermined interval normally required for the servo to adjust the track to its optimum position, the tracking controller is disconnected from the servo input, and a quiescent signal of the appropriate magnitude necessary to maintain the tape in its optimum position is applied to the servo input by a digitally instrumented storage unit that is coupled to the controller.

REFERENCES:
patent: 3342932 (1967-09-01), Bounsall
patent: 3542950 (1970-10-01), Luther
patent: 3600508 (1971-08-01), Dann
patent: 3663763 (1972-05-01), Trost
patent: 3764755 (1973-10-01), Yamashita

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