Phase responsive composite video signal control system
US4642682A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 27, 1984 |
| Grant date | Feb 10, 1987 |
| Priority date | — |
| Expiry date | Apr 27, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/64
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A phase responsive video parameter control system operative for correcting hue, saturation, and luminance of a phase encoded component of a composite video signal. A digital phase detector detects the instantaneous hue of the video image, and provides a signal which selects which one of a plurality of color intervals or bands the detected instantaneous hue falls in. Prestored digital correction values associated with the selected color interval are retrieved from memory and converted into analog correction signals which modify the phase, amplitude, and DC level of the composite video signal. New digital correction values, which reflect operator control panel adjustments, may be loaded into memory during the vertical retrace interval, thereby allowing frame-by-frame color correction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.