Television – Two-way video and voice communication – User positioning
Patent
1993-03-05
1994-12-13
Chan, Wing F.
Television
Two-way video and voice communication
User positioning
379 96, 379100, H04M 1100, H04N 712
Patent
active
053733169
ABSTRACT:
A videoconference device connected to a general commercially available facsimile unit and having a function of sending/receiving a facsimile signal during communication. The videoconference device 1 has a facsimile connection terminal connected to a facsimile unit line connection terminal; a call unit for outputting a call signal for a general analog telephone; a 2W/4W convertor for converting a signal from a 2-line facsimile unit to a signal in a 4-line system where the sending and receiving of signals are separated; a voice band signal encode/decode unit for encoding/decoding a facsimile voice band signal; a power supply for supplying to the facsimile connection terminal a voltage/current which meets the standards of a general analog telephone set; a first current detector for detecting the flow of a current on the basis of supply power from the power supply; a first switching unit for selecting whether a signal from the facsimile connection terminal should be connected to the call unit or to a circuit composed of the power supply, 2W/4W converter, and first current detector; a videoconference control unit: and a multiplexing/demultiplexing control unit for multiplexing the encoded/decoded facsimile voice band signal with a video/voice signal and for demultiplexing the multiplexed signal into facsimile voice band signal, a video/voice signal.
REFERENCES:
patent: 4823375 (1989-04-01), Yoshida
patent: 4878242 (1989-10-01), Springer et al.
patent: 4939772 (1990-07-01), Goto
patent: 5136581 (1992-08-01), Muehrcke
Ishida Kiyoshi
Ishinabe Iwao
Ishiwata Shuichi
Kozono Tomoki
Matsuyama Nobuyuki
Chan Wing F.
Hitachi , Ltd.
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