Television receiver having teletext processor with ROM for on-screen message
US4633297A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 1, 1985 |
| Grant date | Dec 30, 1986 |
| Priority date | — |
| Expiry date | Apr 1, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/47
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A microprocessor based TV/TTX processor includes a stored pages ROM in the TTX processor for storing on-screen display messages and lists of functions and characteristics as pages of TTX data. An RGB switch is coupled to receive the output of a character generator in the TTX processor and to receive the video output of the TV for selectively displaying information from each source with or without the on-screen messages and lists. The stored pages ROM relieves the microprocessor of the necessity of generating the on-screen messages and lists. Items on the list are controllable by the viewer and an indication of the status of the item is given by the microprocessor changing a character in the display memory of the TTX processor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.