Analog voltage memory

Claim 1

ANALOG POTENTIAL MEMORY APPARATUS, COMPRISING A SOURCE OF POTENTIAL VARYING WITH TIME, MEANS FOR SAMPLING SAID POTENTIAL INCLUDING FIRST REACTIVE IMPEDANCE MEANS, MEANS CONNECTING ONE TERMINAL OF THE IMPEDANCE MEANS TO A POINT OF FIXED POTENTIAL, FIRST SWITCH MEANS OPERABLE TO CONNECT SAID SOURCE TO THE OTHER TERMINAL OF THE IMPEDANCE MEANS FOR A TIME LONG ENOUGH TO ESTABLISH THE POTENTIAL OF THE SOURCE ACROSS THE IMPEDANCE MEANS, A SUMMING AMPLIFIER HAVING FIRST AND SECOND INPUTS AND AN OUTPUT, MEANS CONNECTING SAID FIRST INPUT TO SAID OTHER TERMINAL OF THE IMPEDANCE, A SECOND REACTIVE IMPEDANCE MEANS, MEANS CONNECTING THE SECOND IMPEDANCE MEANS TO THE OUTPUT OF THE SUMMING AMPLIFIER, SECOND SWITCH MEANS OPERATIVELY CONNECTED TO THE SECOND IMPEDANCE MEANS AND SHIFTABLE BETWEEN A FIRST SWITCHING CONDITION IN WHICH IT IS EFFECTIVE TO ESTABLISH AN ELECTRICAL CONDITION OF SAID SECOND IMPEDANCE MEANS AT ZERO AND A SECOND SWITCHING CONDITION IN SAID ELECTRICAL CONDITION MAY VARY A SECOND AMPLIFIER HAVING AN INPUT AND AN OUTPUT, MEANS ELECTRICALLY CONNECTING THE SECOND AMPLIFIER INPUT TO THE SECOND IMPEDANCE MEANS, AND MEANS CONNECTING THE SECOND AMPLIFIER OUTPUT TO THE SECOND INPUT OF THE SUMMING AMPLIFIER, AND SWITCH OPERATING MEANS FOR OPENING SAID FIRST SWITCH MEANS AND CONCURRENTLY SHIFTING THE SECOND SWITCH MEANS TO ITS SECOND POSITION, SAID FIRST IMPEDANCE MEANS BEING THEREAFTER EFFECTIVE TO SUPPLY TO THE FIRST INPUT OF THE SUMMING AMPLIFIER A FIRST COMPONENT POTENTIAL VARYING AS A FIRST PREDETERMINED TIME FUNCTION OF THE SOURCE POTENTIAL SAMPLE AT THE TIME THE FIRST SWITCH MEANS IS OPENED, SAID SECOND IMPEDANCE MEANS AND SAID SECOND AMPLIFIER COOPERATING AFTER OPERATION OF THE SECOND SWITCH MEANS TO ITS SECOND POSITION TO SUPPLY TO THE SECOND INPUT OF THE SUMMING AMPLIFIER A SECOND COMPONENT POTENTIAL VARYING WITH TIME AS THE DIFFERENCE BETWEEN THE POTENTIAL SAMPLE AND THE FIRST COMPONENT POTENTIAL, SO THAT THE POTENTIAL AT THE SUMMING AMPLIFIER OUTPUT REMAINS SUBSTANTIALLY CONSTANT AND A MEASURE OF THE POTENTIAL SAMPLE.