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High-Speed Visual Communication over Existing Telephone Networks

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2 Author(s)
A. Beltrami ; Istituto Radiotecnico A. Beltrami, Milan, Italy ; V. Mosca

A fully transistorized low-cost visual communication system has been constructed for the high-speed transmission of still two-level pictures (black and white) over the unmodified existing telephone networks. It reduces the transmission times of ordinary facsimile by a factor of from 10:1 to 20:1, still producing readable pictures with a signal-to-noise ratio of 20 dB. The case of short-distance communication (private telephone exchanges) and some other possibilities of particular application are also discussed. Experimental results are shown, recorded under various operating conditions.

Published in:

IEEE Transactions on Communication Technology  (Volume:17 ,  Issue: 3 )