The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 27, 1993
Filed:
Dec. 28, 1990
Makoto Yamada, Tokyo, JP;
Masayoshi Noguchi, Chiba, JP;
Junji Ono, Tokyo, JP;
Toshihiko Takahashi, Chiba, JP;
Sony Corporation, Tokyo, JP;
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.