Display apparatus

Claim 1

IN COMBINATION WITH A SOURCE OF PULSE SIGNALS, EACH SIGNAL RANDOMLY OCCURRING DURING A DIFFERENT ONE OF SUCCESSIVE BIT PERIODS, MEANS FOR COUNTING THE TOTAL NUMBER OF PULSE SIGNALS OCCURRING DURING EACH OF A PLURALITY OF SUCCESSIVE DIGIT PERIODS, EACH DIGIT PERIOD COMPRISED OF A PREDETERMINED NUMBER OF BIT PERIODS, AND FOR DISPLAYING A PLURALITY OF DIGITS, EACH DIGIT REPRESENTING THE TOTAL NUMBER OF PULSES COUNTED DURING A DIFFERENT DIGIT PERIOD, SAID MEANS INCLUDING: A FIRST COUNTER; MEANS FOR INCREMENTING SAID FIRST COUNTER IN RESPONSE TO EACH OF SAID PULSE SIGNALS; A SECOND COUNTER; MEANS FOR CLEARING SAID FIRST COUNTER AND FOR TRANSFERRING THE COUNT THEREIN TO SAID SECOND COUNTER ONCE DURING EACH OF SAID DIGIT PERIODS; DECODING MEANS HAVING A PLURALITY OF OUTPUT TERMINALS AND RESPONSIVE TO EACH POSSIBLE COUNT IN SAID SECOND COUNTER FOR ENERGIZING A DIFFERENT ONE OF SAID OUTPUT TERMINALS; MEANS FOR GENERATING SINE WAVE AND COSINE WAVE SIGNALS; FIRST AND SECOND SIGNAL MODIFYING CIRCUITS EACH HAVING AN INPUT TERMINAL AND AN OUTPUT TERMINAL; MEANS RESPONSIVE TO THE ENERGIZED DECODING MEANS OUTPUT TERMINAL FOR SELECTIVELY APPLYING EITHER SAID SINE WAVE SIGNAL OR SAID COSINE WAVE SIGNAL TO THE INPUT TERMINALS OF SAID FIRST AND SECOND SIGNAL MODIFYING CIRCUITS DURING EACH OF SAID BIT PERIODS; MEANS IN EACH OF SAID SIGNAL MODIFYING CIRCUITS RESPONSIVE TO SAID ENERGIZED OUTPUT TERMINAL FOR SELECTIVELY REDUCING THE AMPLITUDE OF THE SIGNAL APPLIED THERETO DURING EACH OF SAID BIT PERIODS; MEANS IN EACH OF SAID SIGNAL MODIFYING CIRCUITS RESPONSIVE TO SAID ENERGIZED OUTPUT TERMINAL FOR SELECTIVELY REVERSING THE POLARITY OF THE SIGNAL APPLIED THERETO DURING EACH OF SAID BIT PERIODS; MEANS IN EACH OF SAID SIGNAL MODIFYING CIRCUITS RESPONSIVE TO SAID ENERGIZED OUTPUT TERMINAL FOR APPLYING A SELECTED DIRECT CURRENT BIAS LEVEL SIGNAL TO THE CORRESPONDING SIGNAL MODIFYING CIRCUIT OUTPUT TERMINAL DURING EACH OF SAID BIT PERIODS; A CATHODE RAY TUBE INCLUDING BEAM GENERATING MEANS AND HORIZONTAL AND VERTICAL BEAM DEFLECTING MEANS; AND MEANS FOR RESPECTIVELY COUPLING SAID FIRST AND SECOND SIGNAL MODIFYING CIRCUIT OUTPUT TERMINALS TO SAID HORIZONTAL AND VERTICAL DEFLECTING MEANS.