White balance control circuit
US4219841A · kind A · utility
19Cited by
1References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 5, 1979 |
| Grant date | Aug 26, 1980 |
| Priority date | — |
| Expiry date | Mar 5, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/88
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A white balance control circuit for an encoded composite color television signal is disclosed in which three primary color signals of green (G), blue (B) and red (R) are matrixed to be mixed color signal components, color difference signals of R-G and B-G are provided from the mixed color signal components, and gain control circuits provided on the signal transmission paths of two primary color signals of R and B are so controlled in their gains that the color difference signals become zero, when the white balance adjustment is done.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.