Rotary drum controller

Details Rotary drum controller Rotary drum controller

1990-12-28

1993-07-27

Dixon, Joseph L.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Synchronizing moving-head moving-record recorders

360 75, G11B 5588

Patent

active

052315487

ABSTRACT:
A controller for a rotary drum comprising a measuring module which measures occurrence times of a drum frequency signal that repeatedly and periodically occurs per one revolution of the rotary drum. A divisional time producing module produces a plurality of divisional times obtained by adding successive integer multiples of a period reference for the drum frequency signal to an occurrence time of a phase reference signal that is used for internal signal processing. A rotary drum controlling module computes a plurality of phase errors, each determined by the difference between an occurrence time of the drum frequency signal and an associated divisional time, and controls the phase of the rotary drum based on the phase errors. Accordingly, the controller can quickly establish the desired synchronism of the rotary drum with the phase reference signal.

REFERENCES:
patent: 3038104 (1962-06-01), Wessels
patent: 4216419 (1980-08-01), van Dam et al.
patent: 5008763 (1991-04-01), Horino
Patent Abstracts of Japan, vol. 13, No. 203 (P-870), May 15, 1989 & JP-A-01 023 463 (Yamaha Corp.) Jan. 26, 1989.
Patents Abstracts of Japan, vol 11, No. 299 (P-621), Sep. 29, 1982 & JP-A-62 092 172 (Canon) Apr. 27, 1987.

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