Digital video broadcasting
US6408076B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 3, 1998 |
| Grant date | Jun 18, 2002 |
| Priority date | — |
| Expiry date | Mar 3, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/4623
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In order to descramble sections of scrambled data interleaved with sections of unscrambled data in a transport stream of broadcast video data, while leaving the sections with the original timing relationship in the transport stream, a common data flow path (1-5) is provided both for sections of scrambled data and sections of unscrambled data and signal path loops (6,7; 8,9) including cipher means (62,64) to enable the descrambling of scrambled data, and a control state machine for controlling the flow of data through said common data flow path and said signal path loops to enable passage of unscrambled data sections and descrambling of scrambled data sections, while maintaining the desired relative positions of the data sections.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.