Videocommunication network between videophone terminals and a picture bank
US4533943A · kind A · utility
Inventor
Key dates
| Filing date | Jul 6, 1983 |
| Grant date | Aug 6, 1985 |
| Priority date | — |
| Expiry date | Jul 6, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N7/147
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A videocommunication network is connected between videophone terminals and a picture bank through voice switching units and wide-band switching units included in central offices. A purely telephonic communication can be established between two videophone terminals during a videocommunication between one of the two terminals and the picture bank. Once the videocommunication has been established between the videophone terminal and the picture bank via network voice switching units, the local telephone line assigned to the videophone terminal is automatically released while only a local wide-band line assigned to the videophone terminal is occupied for exchanging vision signals and also data signals with the picture bank via wide-band switching units.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.