Recording and reproducing apparatus

Details Recording and reproducing apparatus Recording and reproducing apparatus

1985-08-01

1986-09-02

Stellar, George G.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Synchronizing moving-head moving-record recorders

360 75, G11B 2104

Patent

active

046099522

ABSTRACT:
In a VTR having a rotary head cylinder (20) having four magnetic heads with 90.degree. angular pitches inbetween on a cylindrical surface thereof, a magnetic recording tape is helically wound around the rotary head cylinder (20), a motor to drive the rotary head cylinder (20) is servo-controlled by utilizing output signal of a phase comparator (10) which compare a first frequency divider (62) to divide frequency of output signal of a rotation phase detector (7) into N/(2N-2) times and an output signal of a second frequency divider (61) for dividing frequency of vertical synchronization signal (S.sub.v) of video signal into 1/2 times, and thereby accurate phase control of the rotary head cylinder is attainable.

REFERENCES:
patent: 4249220 (1981-02-01), Yasutake et al.
patent: 4306254 (1981-12-01), Koda et al.
patent: 4490755 (1984-12-01), Tokuyama
Tetsushi Sato, Yoshio Tokuyama and Eiichi Tsuchiya; "All about Victor VHS Video Movie, `GR-Cl`"; Television Technics & Electronics, pp. 19-27; vol. 32, Apr. 1984.

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