Circuit for producing complex voltages for controlling a device for writing letters, numbers and signs

Claim 1

A CIRCUIT FOR SUPPLYING COMPLEX ELECTRIC SIGNALS FOR CONTROLLING POSTING OR TRACING MEANS EXCITED BY AT LEAST TWO ELECTRIC SIGNALS REPRESENTING TWO COMPONENTS FOLLOWING THE COORDINATE AXIS OF DISPLACEMENT TO BE EFFECTED FOR TRACING AN INDICIA SELECTED FROM THE GROUP COMPOSED OF SIGNS, CAPITAL LETTERS, LOWER CASE LETTERS, AND NUMBERS OF THE TYPE NORMALLY PROVIDED ON A TYPEWRITER KEYBOARD, COMPRISING ELECTRIC GENERATOR MEANS CONNECTED TO SUPPLY CONTINUOUSLY TWO GROUPS OF PERIODIC ELECTRIC WAVES OF DIFFERENT FORMS AND FREQUENCIES WITH EACH GROUP COMPRISING FOUR VOLTAGE SIGNALS, THE FOUR VOLTAGE SIGNALS OF THE FIRST GROUP BEING OF THE SAME FREQUENCY AND SUCCESSIVELY DISPLACED IN PHASE BY 90*, THE FOUR VOLTAGE SIGNALS OF THE SECOND GROUP BEING OF A FREQUENCY DOUBLE THAT OF THE FIRST GROUP OF VOLTAGE SIGNALS AND SUCCESSIVELY DISPLACED IN PHASE BY 90*, D.C. POWER SOURCE MEANS CONNECTED TO SUPPLY TWO CONTINUOUS VOLTAGES OF OPPOSITE POLARITY, GATING CIRCUIT MEANS CONNECTED WITH SAID D.C. POWER SOURCE AND GENERATOR MEANS AND RESPONSIVE TO PREDETERMINED COMBINATIONS OF SAID VOLTAGE SIGNALS AND CONTINUOUS VOLTAGES THEREFROM TO PRODUCE FOR EACH INDICIA SELECTED COMPLEX OUTPUT SIGNALS OF PREDETERMINED VOLTAGE LEVELS DEFINING THE DEFLECTION SIGNAL COMPONENTS ALONG TWO COORDINATE AXES FOR TRACING THE DESIRED INDICIA.