Simulated burst gate signal and video synchronization key for use in video decoding
US6765624B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 1, 1997 |
| Grant date | Jul 20, 2004 |
| Priority date | — |
| Expiry date | Jul 29, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/455
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A simulated burst gate signal and a video synchronization key are generated. A video decoder generates a horizontal sync pulse which is programmed to envelop a color burst, thereby simulating a burst gate signal. The offset to the horizontal sync pulse due to simulating a burst gate signal may be compensated at a video memory subsystem receiving the horizontal sync signal, in order to determine when active pixels are provided by the video decoder. Alternatively, counter circuitry external to the video decoder may be used to generate a simulated burst gate signal by counting the number of pixel clock cycles between the horizontal sync pulse and the color burst. Unlike a burst gate signal generated within a video decoder for use with color separation circuitry in the video decoder, a simulated burst gate signal allows for use of color separation circuitry external to the video decoder. Detecting a color burst using external color separation circuitry is thus also disclosed. The programmable horizontal sync pulse of a video decoder is capable of being programmed and later compensated. The programmable horizontal sync pulse thus may also be used as a synchronization key for video devic…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.