Plural video keyboard access system
US4404551A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 14, 1981 |
| Grant date | Sep 13, 1983 |
| Priority date | — |
| Expiry date | Apr 14, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/0489
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A video communication network (20) capable of providing a plurality of simultaneous textual data video frames to a plurality of keystations (22, 24) from a plurality of computer systems comprising at least two different data bases having incompatible keyboard protocols or character codes (40, 47, 46a, 46b) employs a single keyboard (28, 38) at the keystation (22, 24) to both selectively communicate with various different data base computer systems (40, 47, 46a, 46b) and enable keyboard generated dynamic selection of a textual data video display from a multiplexed plurality of simultaneously provided composite video signals corresponding to the plurality of video frames. Each keyboard (28, 38) may control anywhere from one VDU (26) up to four such VDUs (30, 32, 34, 36), by way of example. The keyboard (28, 38) is connected to a keyboard display driver (42a, 42b) which interfaces the keyboard (28, 38) to the various computer systems (40, 47, 46a, 46b), such as host and subscriber computer systems, and to a video matrix switch (44a, 44b). A keyboard code converter (48a, 48b) is connected between the keyboard display driver (42a, 42b) and an incompatible computer system (40) for conver…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.