Conversational video system having local network control
US4555781A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 30, 1983 |
| Grant date | Nov 26, 1985 |
| Priority date | — |
| Expiry date | Mar 30, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M11/085
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A video conversational data communication network (30) in which subscribers (34, 36) may conduct conversational video textual data communications with one or more keystations (70, 602, 98) in the network (30). Each keystation (70, 602, 98) is associated with a keystation terminal controller interface (68, 96, 600) which is in turn connected to a switching concentrator computer (46, 48, 110, 112, 114) and a message switching node (32, 42, 44) for routing calls throughout the network (30). The concentrators (46, 48, 110, 112, 114) enable calls to be directly routed to controllers (68, 96, 600) sharing the same node (32, 42, 44) without having to go through the node (32, 42, 44). The controller (68, 96, 600) locally stores (304, 306) video conversational textual data for its associated keystations (70, 82, 84, 98, 100, 602) and enables two different designated keystations to conduct two different video conversations with a common keystation in a split screen display (76). The split screen display (76) may also be used to display retrievable data from a data base (50, 52) for simultaneous display (76) along with a video conversation. The data is transmitted between connected controller…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.