Video telephone integrating public-switch telephone network...

Details Video telephone integrating public-switch telephone network... Video telephone integrating public-switch telephone network...

2005-08-02

2005-08-02

Chan, Wing F. (Department: 2643)

Television

Two-way video and voice communication

Transmission control

C348S014010

Reexamination Certificate

active

06924831

ABSTRACT:
The invention includes a telephone using the PSTN, a control module, an ADSL module, and an access and display unit. Using the above, conventional telephone lines are employed for providing a video telephone capable of bi-directional video and audio transmissions. The video telephone is connected with the PSTN, and under circumstances that a receiving party and a calling party are simultaneously using the video telephone, when a receiving party user dials telephone number of the receiving party where by the control module unit is activated to send a signal. Via the PSTN lines, an Internet protocol A or B obtained by the ADSL modules unit is sent to the control module unit of the receiving party or the calling party. The two parties are connected using the IPs sent through the PSTN, and a high frequency band of the ADSL is utilized for transmitting video information.

REFERENCES:
patent: 4387271 (1983-06-01), Artom
patent: 4533943 (1985-08-01), Poirier
patent: 5675375 (1997-10-01), Riffee
patent: 5969750 (1999-10-01), Hsieh et al.
patent: 6201562 (2001-03-01), Lor
patent: 6209025 (2001-03-01), Bellamy

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