System, method, and apparatus for television signal scrambling and descrambling
US4682224A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 31, 1983 |
| Grant date | Jul 21, 1987 |
| Priority date | — |
| Expiry date | Oct 31, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N7/161
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A system for providing intelligible video program signals and corresponding video synchronization signals to authorized video displays only comprising transmitting means for transmitting scrambled signals of at least one video program; a receiver for receiving said scrambled video program signals for said at least one video program; and a descrambling unit coupled to said receiver and including an electronic ticket removably coupled to the input of said video receiver for intercepting and descrambling the at least one scrambled video program signal from said receiver and recovering the synchronizing signals, and means coupling the recovered synchronization sweep signals and the unscrambled intelligible video program signals to said video display.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.