Synchronizing phase shift corrected synchronous signal detecting apparatus
US5220411A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 11, 1991 |
| Grant date | Jun 15, 1993 |
| Priority date | — |
| Expiry date | Jun 11, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/8715
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a system for eliminating time base fluctuation of a video signal having a synchronizing signal and a burst reproduced from a video disk, for example, the synchronism is first coarsely pulled in on the basis of the horizontal synchronizing signal and then precisely follows the time base fluctuation on the basis of the burst signal. A shift of the output synchronizing signal is corrected by using a phase detection of an input horizontal synchronizing signal when an output synchronizing signal is produced on the basis of the read address of a memory for eliminating time base fluctuation, thereby preventing, for example, a superimposed character using the output synchronizing signal from fluctuating on a picture.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.