Communications: electrical – Continuously variable indicating – With meter reading
Patent
1995-03-29
1997-08-26
Zimmerman, Brian
Communications: electrical
Continuously variable indicating
With meter reading
348 16, H04Q 100
Patent
active
056614691
ABSTRACT:
A coupling device for coupling a videotelephone with a video generation device. The coupling device includes (i) a first device, for detecting at least one code word contained in a signal originating from the videotelephone, (ii) a second device, coupled with the first device, for generating a control signal in response to the detected code word, and (iii) a change-over device. The change-over device is coupled with the first device and with the second device. The change-over device receives, from the video generating device, both a first video signal, coded in a first manner, and a second video signal, coded in a second manner. The change-over device then feeds, in response to a control signal, coded video signals originating from one of a number of video generating devices to the first device via the change-over device. The coupling device is readily applicable in multicast environments.
REFERENCES:
Draft prETS 300145, Integrated Services Digital Network (ISDN), Audiovisual Services, Videotelephone Systems and Terminal Equipment Operating on One or Two 64 kbit/s Channels (referring to H-320, G-711, G-722 and G-728), Jul. 1993.
Draft prETS 300144, Integrated Services Digital Network (ISDN), Audiovisual Services, Frame Structure for a 64 to 1920 kbit/s Channel and Associated Syntax for Inband Signalling (referring to H-211), Jul. 1993.
Draft prETS 300143, ISDN, Audiovisual Services, Inband Signalling Procedures for Audiovisual Terminals Using Digital channels up to 2048 kbit/s (referring to H-242), Jul. 1993.
Draft prETS 300142, ISDN, Audiovisual Services, Videocodec for audiovisual services at p*64 kbit/s (referring to H-261) Sep. 1992.
Takizawa et al., "Desktop All-in-One, Color Moving-Picture Videophone", Hitachi Review, vol. 40 (1991), No. 3, pp. 257-262.
Weiss, "Desk Top Video Conferencing--An Important Feature of Future Visual Communications", IEEE International Conference on Communications ICC '90, Atlanta, Georgia, Apr. 19, 1990, pp. 0134-0139.
Mies Ronald Johannes Maria
Schinkel Dolf Albert
Koninklijke PTT Nederland N.V.
Michaelson Peter L.
Pokotylo John C.
Zimmerman Brian
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