Signal filtering mechanism for a multi-purpose digital television receiver
US6628891B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 19, 1999 |
| Grant date | Sep 30, 2003 |
| Priority date | — |
| Expiry date | Nov 19, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/4623
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Conditional access methods and apparatus are provided for use with digital television receivers and other digital broadband receivers. The methods and apparatus are capable of handling several different digital signal transmission protocols in an automatic and flexible manner. An input unit is provided for analyzing and tagging incoming data bytes so that further processing operations are less dependent on the transmission format being received. A cipher handling unit is provided for adapting in real time the scrambling and descrambling performances to match the requirements of the transmission network and the receiving apparatus. A filtering mechanism is provided for filtering and handling multiple asynchronous data streams in a parallel manner. A private recording mechanism is provided for making a private copy of selected incoming signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.