Process and circuit for the demodulation of chrominance signals
US4644388A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 6, 1984 |
| Grant date | Feb 17, 1987 |
| Priority date | — |
| Expiry date | Dec 6, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N11/165
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention relates to chrominance decoding circuits and more particularly to a novel circuit for demodulating chrominance signals, B-Y or R-Y. This circuit comprises, connected in series, a multiplier multiplying the U or V-modulated chrominance signal by itself, a filter giving at the output the square (B-Y).sup.2 or (R-Y).sup.2 of the chrominance signal, a device for extracting the square root giving an absolute value .tbd.B-Y.tbd. or .tbd.R-Y.tbd. of the chrominance signal, and a multiplier multiplying said absolute value by the sign of the chrominance signal B-Y or R-Y to obtain at the output said chrominance signal, B-Y or R-Y.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.