Method and apparatus for securing television signals using sideband interdiction
US5185793A · kind A · utility
3Cited by
4References
22Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 15, 1991 |
| Grant date | Feb 9, 1993 |
| Priority date | — |
| Expiry date | Mar 15, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N7/167
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for securing a television transmission signal from unauthorized reception is disclosed that employs a sideband interdiction technique. A portion of the signal's sideband content is enhanced such that the signal is rendered useless for reception. The signal is decoded by passing the signal through a passive all-pass delay-equalizer network at the site of the receiver.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.