Head tracking control system

Details Head tracking control system Head tracking control system

1981-02-06

1983-09-13

Konick, Bernard

Dynamic magnetic information storage or retrieval

Record editing

360 77, H04N 5783

Patent

active

044046014

ABSTRACT:
A video tape recording/reproducing apparatus for reproducing video signals recorded in successive parallel tracks on a magnetic tape includes a magnetic head for scanning the tracks to reproduce signals recorded therein; a bi-morph leaf for deflecting the head in a direction transverse to the direction along the tracks; a synchronizing signal forming circuit for producing substitute vertical synchronizing signals having correct vertical phase continuity for any of different reproducing modes, regardless of any phase discontinuity in the reproduced vertical synchronizing signals included with the video signals, the substitute vertical synchronizing signals being produced in response to either the reproduced vertical synchronizing signals or a speed ratio signal corresponding to the ratio of the speed of advancement of the tape in the reproducing mode to that in the recording mode, with the speed ratio signal being produced in response to the reproduced horizontal synchronizing signals included with the video signals; and a drive signal circuit for producing a drive signal which includes a head jump signal component and supplying the drive signal to the bi-morph leaf so as to control the latter to deflect the head to accurately scan the tracks, the drive signal circuit including a phase difference detecting circuit for producing a phase difference signal in response to the phase difference between the substitute vertical synchronizing signals and a reference vertical synchronizing signal, and a jump signal forming circuit producing the head jump signal component in response to the phase difference signal and the speed ratio signal.

REFERENCES:
patent: 4215362 (1980-07-01), Ravizza
patent: 4257073 (1981-03-01), Tatami
patent: 4268874 (1981-05-01), Yamagiwa et al.
patent: 4268875 (1981-05-01), Morio et al.
patent: 4287538 (1981-09-01), Sakamoto et al.
patent: 4293879 (1981-10-01), Heitmann et al.

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