Self-tracking injection lock voltage controlled oscillator
US4063279A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 28, 1976 |
| Grant date | Dec 13, 1977 |
| Priority date | — |
| Expiry date | Jun 28, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/455
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Apparatus, including an injection lock and voltage controlled oscillator, generates a signal that follows the average frequency variations and instantaneous phase variations of a repetitive non-continuous signal. The oscillator injection lock input receives the repetitive signal and its DC control input receives an error signal generated in an AFC loop which derives the difference between the oscillator output and the repetitive signal average frequency. In one particular application, the appartus is useful in a color television signal processing or reproducing system for generating a television color subcarrier signal. The apparatus is further disclosed in connection with a demodulation-remodulation type color corrector in a video reproducing system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.