Eight-head magnetic video tape recording and reproducing apparat

Details Eight-head magnetic video tape recording and reproducing apparat Eight-head magnetic video tape recording and reproducing apparat

1975-11-24

1979-02-13

Cardillo, Jr., Raymond F.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Signal switching

360 70, 360 84, 360108, H04N 5785, G11B 2106

Patent

active

041398718

ABSTRACT:
In a magnetic video tape recording and reproducing apparatus (VTR) having rotary magnetic video heads rotating in a direction substantially perpendicular to the direction of tape travel, the width of the magnetic tape is reduced substantially to one inch from the conventional two inches, and eight video heads for recording a video signal on the magnetic tape and for reproducing the video signal from the magnetic tape are mounted on the circumferential surface of a rotary head drum having a diameter substantially equal to two inches and are arranged to be equidistant from one another in the direction of circumference of the rotary head drum. According to this invention, a compact VTR can be realized. In addition, the video signal may be transferred to and from the rotary head drum alternately through one of two circuit paths composed of a signal coupling means and an input/output circuit respectively, in order to realize a more compact, light weight and low power consumption VTR. Further, in order to improve the tape tracking accuracy in the case of such a narrow-width video head, use is made of a control signal whose n cycles of pulses in a pulse series obtained from a drum tachometer pulse are eliminated when a frame reference signal occurs so as to multiplex the pulse series with the frame reference signal. A control signal track is disposed at or around the minimum stretch portion or the center of the magnetic tape in the direction of the tape travel, and the tape travel is controlled by integral, differential, local proportional and proportional control systems, so as to further improve tape tracking accuracy.

REFERENCES:
patent: 2750449 (1956-06-01), Thompson et al.
patent: 2860191 (1958-11-01), Runge
patent: 2866012 (1958-12-01), Ginsburg et al.
patent: 3099709 (1963-07-01), Barry
patent: 3278678 (1966-10-01), Rank
patent: 3333063 (1967-07-01), Stratton
patent: 3487374 (1969-12-01), Droux
patent: 3536856 (1970-10-01), Kietz et al.
patent: 3911486 (1975-10-01), Hibbard
Kybett, Video Tape Recorders, 1974, p. 150.

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