Method and apparatus for television signal scrambling using vertical sync replacement
US6477253B1 · kind B1 · utility
0Cited by
3References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 13, 1999 |
| Grant date | Nov 5, 2002 |
| Priority date | — |
| Expiry date | Jan 13, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/23895
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and device for scrambling video signals for broadcast in a proprietary television system includes modifying the vertical or horizontal synchronization pulses of the video signal to prevent unauthorized viewers from properly displaying the programming content. Preferably, the vertical sync pulses are removed from the signal prior to broadcast and replaced with horizontal sync pulses. A descrambler used with the receiving television uses the manner in which the false horizontal sync pulses were inserted into the video signal to recreate a sufficient approximation of the vertical sync pulses.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.