Audio-visual telecommunications unit designed to form a videopho

Details Audio-visual telecommunications unit designed to form a videopho Audio-visual telecommunications unit designed to form a videopho

1997-01-08

1999-04-06

Chan, Wing F.

Television

Two-way video and voice communication

User positioning

379 9306, 37911001, H04N 712, H04M 1100

Patent

active

058925376

ABSTRACT:
An audio-visual telecommunications system comprises a videophone terminal including a videophone communication interface for making a connection to a telecommunications network. A picture processing unit receives audio-visual signals from the videophone terminal which it process in order to compose a picture with sound. The picture processing unit transmits signals representing the composite picture to a television set. The picture processing unit includes an image memory which stores visual signals in a digital form as they are received from the videophone communication interface. A time base receives a composite video signal from the television set and extracts the line and frame synchronized signals. The time base controls a read-out which is synchronized with the extracted synchronization signals and formed responsive to the signals stored in the memory.

REFERENCES:
patent: 5541982 (1996-07-01), Bergler
patent: 5675375 (1997-10-01), Riffee

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