Scaled video output overlaid onto a computer graphics output
US5710573A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 4, 1995 |
| Grant date | Jan 20, 1998 |
| Priority date | — |
| Expiry date | May 4, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2340/125
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A display control apparatus is provided to generate a scaled video output overlaid onto a computer graphics output. The display control apparatus includes a timing generator, adapted to receive a horizontal synchronization signal of the computer graphics output and the pixel number of horizontal scan line of the scaled video output, for generating a pixel clock of scaled video output and a horizontal lock signal; a scaling buffer, storing a video digital pixel data and having an output port generating the scaled video output, responsive to the pixel clock of scaled video output; an overlay controller, coupled to a controller bus and receiving an analog pixel data of the computer graphics output and, responsive to the pixel clock of scaled video output, the horizontal lock signal and a vertical synchronization signal of the computer graphics output, for overlaying the scaled video output onto the computer graphics output.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.