Video composite transmission system integrating encoded data...

Details Video composite transmission system integrating encoded data... Video composite transmission system integrating encoded data...

H - Electricity

04

N

350/33

H04N 5/04 (2006.01) H04N 7/085 (2006.01) H04N 7/088 (2006.01)

Patent

CA 1127752

ABSTRACT OF THE DISCLOSURE A video composite transmission system connecting a camera and a picture receiver of a picture transmitting device and data ter- minals to a video switching network via an analog two-path line. The transmission part comprises means for shortening the synchronizing pulses of camera video signal into a shortened synchronizing signal, in elongated back blanking porches of which are companded digital multiplex data channels. Other digital multiplex data channels are companded into the trace interval of each available line of vertical synchronizing signal. The companded data channels are converted in a multilevel code and analogically mixed with the shortened blanking and synchronizing signal and the whole of video signal. The receiving part enables each initial data channel and the initial blanking and synchronizing signal to be reconstituted from the analog composite video signal transmitted from video switching network.

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