Head tracking control system for a helical scan VTR

Details Head tracking control system for a helical scan VTR Head tracking control system for a helical scan VTR

1981-07-23

1983-12-13

Kilgore, Robert M.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 102, 360 70, G11B 2110, G11B 2104, H04N 578

Patent

active

044207786

ABSTRACT:
A video tape recording/reproducing apparatus for reproducing video signals recorded in successive parallel tracks on a magnetic tape, includes a magnetic head movable in a direction generally along each of the tracks in a scanning path from a beginning end to a concluding end thereof for reproducing signals recorded therein, and a bi-morph leaf for mounting the head and being operative to deflect the head in a direction transverse to the direction along the tracks. During the scanning operation, the bi-morph leaf is supplied with a dithering signal for wobbling the head transversely with respect to the longitudinal direction of the record tracks, a tracking error signal to correct deviations of the head trace from the tracks to be scanned and a slant compensation signal to correct any inclination tracking error of the head. During the non-scanning operation, a jump signal is supplied to the bi-morph leaf for deflecting the head to accurately scan the beginning of the tracks. The present invention also includes a sample and hold circuit and a comparator circuit for producing a polarity signal corresponding to the direction of any deviation between the scanning trace of the head and the track then being scanned thereby, at the beginning end of the scanned track, and an UP/DOWN counter for producing and storing a control signal and for supplying the control signal to the bi-morph leaf so as to control the latter to deflect the head to accurately scan the beginning ends of the tracks, the counter being controlled by the comparator circuit to change the value of the stored control signal by an incremental amount by counting either UP or DOWN during each scan in accordance with the direction of the deviation at the beginning ends of the tracks.

REFERENCES:
patent: 4285017 (1981-08-01), Arter
patent: 4287538 (1981-09-01), Sakamoto
patent: 4356522 (1982-10-01), Takano
patent: 4361857 (1982-11-01), Sakamoto
patent: 4364097 (1982-12-01), De Boer
patent: 4366515 (1982-12-01), Takano
patent: 4370685 (1983-01-01), Hosoi

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