Method and apparatus for downloading a code defining the channel transmission format employed in an addressable CATV system
US4677685A · kind A · utility
138Cited by
7References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 16, 1985 |
| Grant date | Jun 30, 1987 |
| Priority date | — |
| Expiry date | Jul 16, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N7/1675
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A tuning mode command identifying the channel transmission format being used in an addressable CATV system is transmitted via a plurality of encoded CATV channels for downloading in subscriber home terminals. Downloading at the home terminals is effected by executing a plurality of sequential tuning cycles each comprising sequentially tuning successive CATV channels configured according to a different transmission format until a channel is tuned on which encoded data is being accurately received.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.