VIR Control of hue and saturation in RGB demodulator
US4261009A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 17, 1978 |
| Grant date | Apr 7, 1981 |
| Priority date | — |
| Expiry date | May 17, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/68
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A chrominance signal controlling apparatus for controlling the chrominance signal in a color television receiver employing a primary color signal demodulator providing red, green and blue primary color signals and not providing color difference signals comprises a luminance signal producing circuit for producing a luminance signal by mixing the three primary color signals, a subtracting circuit for producing a difference signal between one of the primary color signals and the luminance signal, and a comparing circuit for producing a control signal for controlling the chrominance signal level and/or phase by keeping the difference signal equal to a reference level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.