H - Electricity – 04 – M
Patent
H - Electricity
04
M
350/3, 379/4
H04M 11/00 (2006.01) H04M 3/56 (2006.01) H04M 9/10 (2006.01) H04N 7/14 (2006.01) H04N 7/15 (2006.01)
Patent
CA 1051568
ABSTRACT OF THE DISCLOSURE: Video conference system connecting a plurality of remotely located conference rooms, each containing a group of conferees. In each room a plurality of videotelephones are respectively associa- ted with microphones and assigned to the conferees, and each include a camera and an image receiver. The first stage of a voice voting circuit compares the levels of the speech signals generated by the microphones in each room. One of address regis- ters records an address signal defining the video-telephone asso- ciated with the microphone generating the loudest speech signal. A duplexer and acoustic feedback preventing circuit are further provided for adding all the signals generated by the microphones, in each room and thereby obtaining room cumulated microphone signals, the levels of which are compared in the second stage of the voice voting circuit. An address register records an address signal de- fining the room whose microphones generate the loudest cumulated signal. The rooms are connected through transmitting and receiving video switching networks. A video switch selectively connects the camera of the videotelephones of a room to the image receivers thereof and to the video switching network. A switch logic con- trols the video switch and is itself controlled by the videotele- phone address signals and the room address signals.
253354
Buchner Georges
Martel Gilbert F.
Poirier Alain M.
Buchner Georges
Martel Gilbert F.
Poirier Alain M.
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