Video signal superimposing device
US4639768A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 1, 1984 |
| Grant date | Jan 27, 1987 |
| Priority date | — |
| Expiry date | Oct 1, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/76
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A video signal superimposing device for superimposing and clearly displaying video signals produced from at least two discrete systems includes an input terminal for inputting a color complex video signal, a separation circuit for separating a first brightness signal and a first chroma signal from the color complex video signal, a first generator for generating a second brightness signal, a first mixer circuit for mixing the second brightness signal and the first brightness signal separated by the separation circuit, a second generator for generating a second chroma signal, a second mixer circuit for mixing the second chroma signal and the first chroma signal separated by the separation circuit, and a third mixer circuit for mixing the mixed brightness signal applied from the first mixer circuit and the mixed chroma signal applied to the second mixer circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.