Chroma-preference control for VIR automatic operation
US4059838A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 24, 1976 |
| Grant date | Nov 22, 1977 |
| Priority date | — |
| Expiry date | Sep 24, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/64
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Viewer preference adjustment of saturation is realized in a VIR controlled color television receiver by provision of a closed loop control circuit exclusive of the RGB matrix. During the presence of the VIR signal a control signal is generated within the closed loop that controls the chrominance to luminance ratio of the chrominance and luminance signals applied to the RGB matrix and to the blue matrix contained within the closed loop. Adjustment of the level of either the luminance signal or the chrominance signal applied to the blue matrix affects the control signal which in turn adjusts said chrominance to luminance ratio to compensate and thereby brings about a shift in the levels of the red, green and blue signals outputted by the RGB matrix to change the saturation of the color picture.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.