Video frame synchronization of independent timing generators for frame buffers in a master-slave configuration
US5963200A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 20, 1997 |
| Grant date | Oct 5, 1999 |
| Priority date | — |
| Expiry date | Aug 20, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N13/332
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for synchronizing the vertical blanking of multiple frame buffers which may exist on the same computer or separate computers for certain applications including stereo display, virtual reality and video recording, which require such synchronization. To obtain the required synchronization one frame buffer is designation as the master. It provides a signal called FIELD that changes state (0 to 1 or 1 to 0) at the start of every vertical sync event on the master frame buffer. All other frame buffers are set to be slaves. Their timing generators sample the master's FIELD signal. When they detect the master's FIELD signal changing state, they set their own internal timing to match to thereby achieve frame synchronization.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.