Video frame detector readily adaptable to video signal formats without manual programming and method for same
US6160589A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 29, 1997 |
| Grant date | Dec 12, 2000 |
| Priority date | — |
| Expiry date | Dec 29, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/10
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A video frame detector circuit used in synchronizing one video signal with another video signal. The video frame detector of the present invention is able to automatically detect a start of frame portion of any video composite synchronization signal connected to it without requiring programming. The start of frame commences with the least frequent vertical field, or if all fields are equally frequent, a deterministic process is used to promote one of the fields to be the start of the frame. Since the video frame detector circuit of the present invention does not require programming to recognize various video signal formats, it readily adapts to different video signal conditions with little or no manual intervention. The video frame detector contains a number of memory stores for storing previously detected video patterns obtained from a composite synchronization signal. Once a current pattern is ascertained from the composite synchronization signal, it is compared against the stored patterns. Information regarding recognized patterns is stored in a history FIFO. New patterns are stored in vacant memories replacing those stored patterns that are most frequently seen. Frequency count…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.