UEbertragungssystem zum UEbertragen von Zeichen

摘要

A transmission system for transmitting characters which are picked up by a television camera. The video signal produced is converted into a pulsatory signal each pulse of which determines a black-to-white transition which signal is subsequently applied to a digital-to-analog converter which provides a signal varying in amplitude and comprising several samples which signal is transmitted together with field synchronizing signals through a transmission path to the receiver circuit. In the receiver circuit the signal varying in amplitude, together with the field synchronizing signals is applied directly or through a memory to a display device including a cathode-ray tube having two pairs of deflection means for deflecting an electron beam generated in the tube into two directions which are transverse to each other, a sawtooth signal of field frequency generated under the control of said field signals being applied as a time base to a first pair of deflection means and the signal varying in amplitude being applied to the second pair of deflection means.