Graphics overlay device
US5883610A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 22, 1996 |
| Grant date | Mar 16, 1999 |
| Priority date | — |
| Expiry date | Oct 22, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2340/125
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
There is disclosed a graphics overlay device for overlaying a video signal and a graphics signal and outputting the overlayed signal, the graphics overlay device including a frame memory for storing video data, a video address generator for generating a video address which designates an area of the frame memory to read therefrom or store therein, at least two graphics overlay memories for reading and writing graphics data alternatively by a predetermined period wherein the writing is performed on an area designated by a graphics address and the reading is performed on an area designated by the video address, a multiplexer for selecting and outputting graphics data output from one of graphics overlay memories, a look up table for overlaying the video data output from the frame memory and the graphics data output from the multiplexer and outputting the overlayed data, and a central processing unit for generating the graphics data which designates an area of the graphics overlay memories on which the graphics data is to be stored, and a select controlling signal which controls recording and reading operations of the graphics overlay memories, and a switching operation of the multiplex…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.