Helical scan magnetic recording and reproduction system with hea

Details Helical scan magnetic recording and reproduction system with hea Helical scan magnetic recording and reproduction system with hea

1983-05-05

1987-02-17

Cardillo, Raymond F.

Dynamic magnetic information storage or retrieval

Record editing

360 103, 360 77, G11B 15467, H04N 5783

Patent

active

046444149

ABSTRACT:
A magnetic recording and reproduction system of the helical scan type is disclosed. During the recording process, pilot signals for reproduction tracking control are sequentially recorded by the rotary magnetic head in recording tracks in proximity to each other in superimposed relation with the television signal to be recorded. During the normal reproduction process, from the level difference between the crosstalk signals of the pilot signals reproduced from the recording tracks adjacent to the recording track to be reproduced, a tracking error is detected to control the relative positions of the recording track and the reproduction scanning traces of the reproduction magnetic head. During the reproduction process at a speed different from that for recording, on the other hand, a pulse signal is produced at a time point when the crosstalk levels of the pilot signals reproduced from the tracks adjacent to the recording track to be reproduced coincide with each other. This pulse signal is used to maintain a predetermined positional relation between the recording track and the reproduction scanning traces of the reproduction magnetic head thereby to produce a superior reproduced image.

REFERENCES:
patent: 3557320 (1971-02-01), Hopf
patent: 3943562 (1976-03-01), Opelt
patent: 4071856 (1978-01-01), Kihara et al.
patent: 4189758 (1980-02-01), Morio et al.
patent: 4190869 (1980-02-01), Ota
patent: 4276571 (1981-06-01), Sakamoto
patent: 4403260 (1983-09-01), Kawamura et al.
patent: 4414586 (1983-11-01), Hirota et al.
patent: 4439799 (1984-03-01), Haubrich et al.

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