Teletext communication system with timed multipage local memory
US4388645A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 13, 1981 |
| Grant date | Jun 14, 1983 |
| Priority date | — |
| Expiry date | Apr 13, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N7/0882
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A teletext communications system comprises a transmitter, e.g. an orbiting satellite, transmitting multiple pages of a teletext encoded data service at selected times of the day, each teletext page including a first non-displayable auxiliary teletext data row defining a selected time interval and a unique page memory address code. The transmitter also continuously transmits a second non-displayable auxiliary teletext data row including a time of day code. A teletext decoder is adapted for acquiring and storing each transmitted teletext page at a page memory defined by said page memory address code and automatically rebroadcasts each of the stored pages for which the stored selected time interval coincides with the transmitted time of day code.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.