Television – Two-way video and voice communication – User positioning
Patent
1995-10-12
1998-05-12
Chan, Wing F.
Television
Two-way video and voice communication
User positioning
348 15, 379 9308, 379 9321, 370524, 370468, H04N 712, H04M 1100
Patent
active
057513392
ABSTRACT:
A television conversation/monitoring system connecting a central station and a plurality of terminal stations through an ISDN line. The central station has a picture/sound conversation/monitoring device, a picture input/output device, a sound input/output device, a system control portion and an ISDN line terminal device, and each of the terminal stations has a picture/sound conversation/monitoring device, a system control portion, a picture input/output device, a sound input/output device, a terminal station state change detecting device and an ISDN line terminal device. The central-station-side system control device has a function to control the line capacity, so that conversation and monitoring can be performed with a plurality of terminal stations simultaneously while the line capacity is changed in accordance with the state of terminals.
REFERENCES:
patent: 5371534 (1994-12-01), Dagdeviren et al.
patent: 5444477 (1995-08-01), Yamadera et al.
patent: 5585839 (1996-12-01), Ishida et al.
patent: 5590127 (1996-12-01), Bales et al.
Aramaki Toru
Ishida Kiyoshi
Watanabe Toshio
Chan Wing F.
Hitachi , Ltd.
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