Multilocation video conference terminal including an arrangement

Details Multilocation video conference terminal including an arrangement Multilocation video conference terminal including an arrangement

1983-10-25

1985-07-16

George, Keith E.

179 18BC, H04M 1100, H04M 356, H04N 714

Patent

active

045298394

ABSTRACT:
In a Multilocation Conference Terminal (MLCT), disruptions in the video being viewed which are caused by switching from one conference location to another are minimized by delaying switching of the video signal until a so-called get ready control signal is received from the conference location to be viewed. The conference location transmits the get ready control signal a predetermined interval prior to transmitting a so-called fast video picture update in response to a request from a Multilocation Conference Terminal (MLCT). Additional possible disruptions in the video are eliminated by minimizing the number of fast video picture updates that are used to serve a multiplicity of requests from other conference locations. When multiple MLCTs are employed in a conference, the MLCTs communicate to each other the video select modes of all the conference locations in the conference, i.e., a manual select mode or an automatic select mode. Then, the video select mode information is used to minimize the number of fast video picture updates needed to serve conference locations in the automatic select mode.

REFERENCES:
patent: 3519744 (1970-07-01), Dorros et al.
patent: 3601530 (1971-08-01), Edson et al.
patent: 4004084 (1977-01-01), Brown et al.
patent: 4054908 (1977-10-01), Poirier et al.
"Teleconferencing", IEEE 1981 Conference on Communications, vol. 2, pp. 31.2.1-4, Jun. 1981, by David W. Kennett.
Bernard A. Wright, "The Design of Picturephone.RTM. Meeting Service (PMS) Conference Centers for Video Teleconferencing", IEEE Communications Magazine, pp. 30-36, Mar. 1983.
Audrey J. Kames and W. Gordon Heffron, "Human Factors Design of Picturephone.RTM. Meeting Service", Globecom'82 Conference Record, vol. 3, pp. 976-981, 1982.

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