Conditional access television sound
US7146008B1 · kind B1 · utility
9Cited by
11References
25Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 16, 2000 |
| Grant date | Dec 5, 2006 |
| Priority date | — |
| Expiry date | Oct 23, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/835
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A digitally encrypted audio signal may be transmitted with an analog television signal. Access to the analog television video signal may be controlled by using graphics overlay techniques. The use of digital encryption techniques on the audio channel prevents improper interception.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.