Multiplex communications – Wide area network – Packet switching
Patent
1990-05-31
1991-03-26
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
379 53, 379205, 358 85, H04M 342
Patent
active
050035320
ABSTRACT:
A multi-point conference system for making a video conference includes a center unit having a controller and an image selector, and three or more stations respectively coupled to the center unit, where each station includes at least one camera for picking up an image to output an image data, a display for displaying an image based on an image data and a request part for making a request. The controller initially sets master, sub and participating stations in conformance with a predetermined rule. The image selector automatically supplies the image data from the master station to the sub and participating stations to be displayed on the display thereof and supplies the image data from the sub station to the master station to be displayed on the display thereof. The controller automatically sets a new master station in response to a request from the request part of an arbitrary station requesting the new master station, sets the master station prior to receiving the request as a new sub station and sets all stations other than the new master and sub stations as new participating stations.
REFERENCES:
patent: 4540850 (1985-09-01), Herr et al.
patent: 4650292 (1987-03-01), Boerger et al.
patent: 4710917 (1987-12-01), Tompkins et al.
patent: 4797877 (1989-01-01), Pope et al.
patent: 4805205 (1989-02-01), Faye
patent: 4878242 (1989-10-01), Springer et al.
Ashida Youichi
Ishiguro Hitoshi
Natori Hiroaki
Sato Hitoshi
Yoshida Yuji
Fujitsu Limited
Kim Una
Olms Douglas W.
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