Method and apparatus for synchronizing video and graphics data in a multimedia display system including a shared frame buffer
US5977989A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 2, 1997 |
| Grant date | Nov 2, 1999 |
| Priority date | — |
| Expiry date | Sep 2, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S715/972
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A multimedia display system includes a central processing unit, a storage device associated with the central processing unit, a standard interface bus to which the central processing unit and the storage device are connected, a graphics processor connected to the bus for generating graphics data in response to commands from the central processor, a digitizer for converting an analog video signal to digital form and for producing synchronization signals, a video processor for processing the digitized video data to produce pixel representations of the digitized video signal, a shared frame buffer for storing the graphics data generated by the graphics processor and the pixel representations of the video signal, a device for converting the stored digital data to a data stream appropriate for driving a video monitor, and a video monitor for displaying the graphics data and the video information, wherein the video processor generates a programmable variable phase vertical synchronization signal for synchronizing video data and graphics data through a shared frame buffer with the capacity to handle relocatable windows.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.