System of programmable time intervals used for video signal synchronization
US8446527B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 21, 2010 |
| Grant date | May 21, 2013 |
| Priority date | — |
| Expiry date | Aug 6, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/8458
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A circuit and a method for using the circuit to provide synchronization between a first video signal and a second video signal are provided, comprising a circuit to capture a first video signal, a circuit to measure the timing format of the first video signal including an input clock and count input Vsync pulses, a circuit to measure a phase difference between the first video signal and the second video signal, a circuit to generate an output video signal comprising a number of output Vsync pulses and an output clock, and a PLL circuit to control the output clock period as a constant ratio of the input Vsync period, and maintain a constant number of output clock periods per a number of input clock periods. Also provided is a system to perform the method as above using the circuit as above, maintaining a constant ratio between the output clock period and a number of input clock periods.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.