Sub-scrambling/descrambling method and sub-scrambling/descrambling device
US7580525B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 11, 1999 |
| Grant date | Aug 25, 2009 |
| Priority date | — |
| Expiry date | Mar 11, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/03866
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A sub-scrambling/descrambling method and device enhances the degree of scrambling of linear PCM data. Data is delimited at predetermined times, and the minimum value of a run is found and used as annex information. The run part is replaced with an arbitrary irreversible random data string, which is processed by a main scrambling device to generate transmission data. After main descrambling of the transmission data, a descrambling device takes out the annex Information and replaces the random data string with a predetermined “0” or “1” run according to the annex information. Thus, the degree of scrambling of linear PCM data is enhanced as much or more than compressed video data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.