Pay television
US5272751A · kind A · utility
4Cited by
10References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 12, 1993 |
| Grant date | Dec 21, 1993 |
| Priority date | — |
| Expiry date | Mar 12, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N7/1713
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a pay television device, a horizontal sync signal, a vertical sync signal, and the like are removed from a composite video signal, and first-frequency and second-frequency signals for descrambling processing are attached in the intervals corresponding to the removed signals, thus eliminating the need for multiplexing signals which are necessary for descrambling processing on an audio signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.