Digital video broadcasting
US6072873A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 3, 1998 |
| Grant date | Jun 6, 2000 |
| Priority date | — |
| Expiry date | Mar 3, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/43853
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In order to implement the Digital Video Broadcasting descrambling algorithm in the context of MPEG compressed data streams containing interleaved sections of scrambled and unscrambled data, at a data rate of 60 MBits/sec with a clock of 2.7 MHz, a stream cipher has an input to receive scrambled video data, and an output coupled to a block cipher for providing descrambled data, the stream cipher comprises shift register means for holding input data coupled to a first mapping logic mechanism comprising at least a first logic means and a second logic means coupled in sequence and arranged to carry out similar logical steps, and the block cipher means comprising shift register means for holding the output of the stream cipher means and a second logic mapping mechanism, comprising at least a first logic means, a second logic means, a third logic means and a fourth logic means coupled in sequence being arranged to carry out similar logical steps.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.