Extrapolation computer using reversible counter for trajectory measurement

Claim 1

APPARATUS FOR DETERMINING THE VALUE OF A DEPENDENT FUNCTION V AT A SELECTED POINT VO WHERE SAID DEPENDENT FUNCTION VARIES WITH RESPECT TO AN INDEPENDENT VARIABLE T IN A MANNER AT LEAST APPROXIMATELY KNOWN, COMPRISING MEANS FOR RECEIVING A PLURALITY OF SIGNALS VARYING ACCORDING TO CHANGES IN SAID FUNCTION V; MEANS FOR GENERATING PULSES FROM SAID SIGNALS; A REVERSIBLE COUNTER FOR COUNTING SAID PULSES; MEANS FOR STARTING THE COUNT OF SAID PULSES BY SAID COUNTER AT A TIME EQUAL TO T1-$T-TG AND MEANS FOR STOPPING SAID COUNT BY SAID COUNTER AT A TIME EQUAL TO T1-$T+TG TO YIELD A NUMBER OF PULSES IN SAID COUNTER PROPORTIONAL TO 2V1'' WHERE T1 REPRESENTS A VALUE OF THE INDEPENDENT VARIABLE T, $T REPRESENTS A MAGNITUDE OF THE VARIABLE T DETERMINED IN ACCORDANCE WITH THE EXTENT OF DEVIATION FROM A LINEAR RELATIONSHIP BETWEEN THE INDEPENDENT VARIABLE T AND THE DEPENDENT VARIABLE V, THE SUM OF TG AND TG OR 2TG REPRESENTS THE TOTAL LENGTH OF SAMPLING PERIOD DURING WHICH SAID COUNT IS MADE, AND V1'' REPRESENTS THE AVERAGE VALUE OF THE FUNCTION V DURING THE PERIOD 2TG; MEANS FOR SUBTRACTING A PLURALITY OF PULSES FROM SAID REVERSIBLE COUNTER; MEANS FOR STARTING SAID SUBTRACTING COUNT AT A TIME EQUAL TO 2TG1-TG/2 AND MEANS FOR STOPPING SAID SUBTRACTING COUNT AT A TIME EQUAL TO 2TG1-TG/2 TO RESULT IN A SUBTRACTING COUNT PROPORTIONAL TO V2 WHERE V2 REPRESENTS THE AVERAGE VALUE OF THE FUNCTION V DURING A SECOND SAMPLING PERIOD CENTERED ABOUT A TIME EQUAL TO 2T1 AND HAVING THE LENGTH TG; THE RESULTING NUMBER OF PULSES IN SAID REVERSIBLE COUNTER THEREBY EQUALING 2V1''-V2 WHICH IS EQUAL TO SUBSTANTIALLY THE DESIRED VALUE OF V AT VO.