Conversion of television signal formats with retention of common control data stream
US5138659A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 2, 1991 |
| Grant date | Aug 11, 1992 |
| Priority date | — |
| Expiry date | May 2, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N7/24
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Television signals are converted from a first format to a plurality of different formats while retaining a common control data stream. A first television signal in a first format is separated into a first signal portion carrying television information and a second signal portion carrying control data. The first signal portion is reformatted into a second format. The second signal portion is combined with the reformatted first signal portion to provide a second television signal. In this manner, a plurality of television signals having different formats can be transmitted with common control data, e.g., for controlling access to television programming.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.