Television – Two-way video and voice communication – User positioning
Patent
1997-08-28
1999-12-28
Loomis, Paul
Television
Two-way video and voice communication
User positioning
379 9321, 379202, H04N 714
Patent
active
060088389
ABSTRACT:
A multi-point video conference system includes a plurality of CODECs which are set at multiple points and participate in a conference, and a multi-point control unit for transmitting/receiving voice signals and video signals between the CODECs. The multi-point control unit includes level measuring circuits, level adjusting circuits, an audio mixer, and a video signal processing circuit. The level measuring circuits measure the levels of voice signals input from the CODECs. The level adjusting circuits adjust the levels of the voice signals input from the CODECs to substantially the same level on the basis of the measurement results obtained by the level measuring circuits. The audio mixer adds the voice signals output from level adjusting circuits, and outputs a sum voice signal, from which the voice signal corresponding to each of the CODECs at transmission destinations is removed, to each of the CODECs. The video signal processing circuit performs signal processing for video signals input from the CODECs, and outputs the video signal from a talk CODEC to which a last talker belongs to all the CODECs.
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patent: 5539741 (1996-07-01), Barraclough
patent: 5768263 (1998-06-01), Tischler
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"Multi-point Control Unit", NEC technical report, vol. 44, No. 6/1991, pp. 32-38.
Loomis Paul
NEC Corporation
Ramakrishnaiah Melur
LandOfFree
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