Hybrid servo control system
US4004205A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Dec 6, 1973 |
| Grant date | Jan 18, 1977 |
| Priority date | — |
| Expiry date | Dec 6, 1993 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S388/902
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A hybrid servo control system for controlling, for example a rotation of a capstan driving motor or a head motor of a video tape recorder comprises at least an integral control loop including an analog phase comparator for detecting in an analog mode a phase difference between a signal related to the rotation of the capstan driving motor or the head motor to be controlled and a reference signal so as to produce an analog amount corresponding to said phase difference, an analog-digital converter for converting said analog amount into a digital amount and a digital frequency modulator for frequency modulating in a digital mode clock pulses with said digital amount.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.