Insertion of supplemental burst into video signals to thwart piracy and/or carry data
US5651065A · kind A · utility
23Cited by
7References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 9, 1995 |
| Grant date | Jul 22, 1997 |
| Priority date | — |
| Expiry date | Mar 9, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N7/1693
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A video signal is modified to include a supplemental burst signal on at least some of the scan lines for each frame. The supplemental burst signals are used to prevent a pirate decoder from descrambling horizontally sync suppressed scrambled signals by deriving a synchronization timing reference from the color burst signal. The supplemental burst signals can also or alternatively be used to carry data in an otherwise conventional analog video signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.