Servo-control system for signal recording and/or reproducing app

Details Servo-control system for signal recording and/or reproducing app Servo-control system for signal recording and/or reproducing app

1976-05-25

1978-01-31

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the record

360 77, 360 70, 360 66, 360 64, G11B 1546

Patent

active

040718565

ABSTRACT:
In an apparatus for recording and/or reproducing information signals, such as, video signals, on a magnetic tape or other record medium by means of rotary recording and/or reproducing heads which scan successive parallel tracks extending across the tape as the latter is longitudinally advanced: a servo-control system for ensuring accurate scanning of the tracks during reproducing operation includes an auxiliary rotary head repeatedly traversing the tape in coordination with the recording and/or reproducing heads and which, during the recording operation, records pilot signals in areas that are spaced apart along an edge portion of the tape and also traversed by the recording and/or reproducing heads, with each of such areas having an extent in the longitudinal direction of the tape that corresponds, and is in predetermined positional relation to a respective plurality of the successive tracks in which the information signals are being recorded; and, during reproducing operation of the apparatus, a reproduced pilot signal is derived from each of the recording and/or reproducing heads during each traversal by the latter of each area in which a pilot signal is recorded, the levels of the reproduced pilot signals obtained during two different traversals of each area recorded with the pilot signal are compared, and, on the basis of such level comparison, the speed of advancement of the tape is regulated.

REFERENCES:
patent: 3293627 (1966-12-01), Auyang
patent: 3504116 (1970-03-01), Sato
patent: 3838453 (1974-09-01), Buslik
patent: 3911477 (1975-10-01), Lackner
patent: 4005481 (1977-01-01), Lackner

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