Video scrambling
US5815572A · kind A · utility
12Cited by
8References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 31, 1995 |
| Grant date | Sep 29, 1998 |
| Priority date | — |
| Expiry date | Aug 31, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N7/1716
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A system for scrambling a video signal, wherein multiple modes of scrambling are available, including (i) line reversal, (ii) line inversion, (iii) line permutation, and (iv) block permutation. The invention changes the combination of modes used as time progresses. In addition, particular modes can be implemented, or suppressed, in response to such factors as (i) noise in the transmission channel and (ii) amount of motion within the video image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.