Digital phase servo system

Details Digital phase servo system Digital phase servo system

1977-10-25

1980-06-03

Truhe, J. V.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Synchronizing moving-head moving-record recorders

318314, 318608, 318683, G11B 2104

Patent

active

042064856

ABSTRACT:
In a digital servo system suitable for controlling the rotational phase of a rotating body, such as, the rotary head drum of a video tape recorder (VTR), a binary output signal is provided, as a phase error signal, based upon the phase relation between a reference signal and a command signal showing the rotational phase of the rotary head drum, and such binary output signal is used to process a motor drive signal. Further, an analog servo system is used in association with the digital servo system to provide highly accurate correction of both high and low frequency phase errors.

REFERENCES:
patent: 3206665 (1965-09-01), Burlingham
patent: 3408549 (1968-10-01), Shimabukuro
patent: 3495152 (1970-02-01), Keiser et al.
patent: 3764755 (1973-10-01), Yamashita et al.
patent: 3934269 (1976-01-01), Fujita et al.

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