Set top box for receiving and decryption and descrambling a plurality of satellite television signals
US5742680A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 13, 1995 |
| Grant date | Apr 21, 1998 |
| Priority date | — |
| Expiry date | Nov 13, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N7/163
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A system and corresponding method are provided for selecting one of a plurality of simultaneously received encrypted direct broadcast satellite (DBS) signals for decryption and viewing. A converter box or decrypting device is provided with a plurality of different decrypting smart cards, all of which are simultaneously inserted in the converter box. The user or viewer scans the received signals and selects one for viewing. The different decrypting algorithms of the different smart cards respectively correspond to the different encryptions of the received DBS signals so that the selected encrypted signal is decrypted by the appropriate and corresponding decrypting smart card and subsequently decompressed and viewed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.