Process and device for synchronizing a reference signal with respect to a video signal
US7050111B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 25, 2002 |
| Grant date | May 23, 2006 |
| Priority date | — |
| Expiry date | Mar 11, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/126
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A synchronization process may include detecting successive horizontal synchronization pulses of a video signal, and a phase comparison between the successive detected pulses and the successive transitions of the reference signal for controlling the oscillator of the phase-locked loop. The detection of each horizontal synchronization pulse may include sampling the video signal, low-pass filtering the sampled signal, thresholding the filtered signal for leaving pulses having a level below a threshold. The synchronization process may also include selecting, as a function of predetermined selection criteria, from among the residual pulses within an observation window centered on a transition of the reference signal for the one which corresponds to the horizontal synchronization pulse.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.