Method and apparatus for coordinating horizontal and vertical synchronization signals
US7230615B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 5, 2002 |
| Grant date | Jun 12, 2007 |
| Priority date | — |
| Expiry date | Jan 21, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/12
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a signal coordinating method and apparatus, a pulse generating circuit receives a VSYNC signal and generates a plurality of critical pulses that define critical time periods from fields can control edges of the VSYNC signal. A determining circuit receives an HSYNC signal and the critical pulses, and generates a trigger signal upon detecting that a line scan control edge of the HSYNC signal appears during one of the critical time periods. A time delay loop introduces a time delay into the VSYNC signal upon receipt of the trigger signal to cause the critical time period to appear after the line scan control edge of the HSYNC signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.