Rotary drum controller
US5231548A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 28, 1990 |
| Grant date | Jul 27, 1993 |
| Priority date | — |
| Expiry date | Dec 28, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B15/473
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.