Video telephone and method for changing communication mode durin

Television – Two-way video and voice communication – User positioning

Patent

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Details

348 15, 379 9317, H04N 714

Patent

active

059092394

ABSTRACT:
A video telephone system has a control unit for performing a control routine in response to a mode control signal, a tone code codec unit for decoding, a tone code signal from a telephone network line to produce the mode control signal and receiving a mode control signal from the control unit to generate a tone code indicative of mode setting and changing, and a switch for connecting a telephone network to either a modem or a telephone set under the control of the control unit. The control unit is also provided to control the entire operation of the video telephone system. The video telephone system is capable of selecting, when there is a video communication request from a video telephone of either a calling or a called party, the other party approves the connection/disconnection of a video communication with the video telephone. The video telephone system is also capable of easily changing communication modes during a communication thereof.

REFERENCES:
patent: 3711648 (1973-01-01), Whitney
patent: 3917904 (1975-11-01), Macrander et al.
patent: 5610975 (1997-03-01), Tsuchida
patent: 5619252 (1997-04-01), Nakano

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