Telegraphy – Systems – Printing
Patent
1976-10-20
1978-09-05
Richardson, Robert L.
Telegraphy
Systems
Printing
179 15BS, 343179, H04L 514
Patent
active
041122526
ABSTRACT:
A text editing system is provided in which a central station communicates a video signal, timing signals, and control signal to a remote station by way of a single communication pathway for subsequent display on a cathode ray tube at the remote station and wherein keyboard information may be communicated from the remote station to the central station across the same communication pathway. The video signal from the central station includes conventional horizontal and vertical synchronization pulses which are encoded prior to transmission to the remote station and decoded at the remote station. In addition, the video signal is inhibited during both the horizontal and vertical synchronization pulses so that during the horizontal synchronization pulse, keyboard information from the remote station may be communicated to the central station across the communication pathway while during the vertical synchronization period control signals may be communicated from the central station to the remote station via the communication pathway.
REFERENCES:
patent: 3691295 (1972-09-01), Fisk
patent: 4013836 (1977-03-01), Williams
Omnitext, Inc.
Richardson Robert L.
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