Conversational video system
US4388489A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 30, 1981 |
| Grant date | Jun 14, 1983 |
| Priority date | — |
| Expiry date | Jan 30, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L12/1804
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A video conversational data communication network (30) in which subscribers (34, 35) may conduct conversational video textual data communications with one or more keystations (70, 602, 98) 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 message switching node (32) for routing calls throughout the network (30). The keystation controller interface (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 video conversational textual data is transmitted between connected keystation controller interfaces (96, 602) in packets which contain less than the total displayable data content of the conversational video textural data message input via the keyboard (72). The keystation controller interfac…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.