Average signal value measuring means using storage means alternately connected to the signal and a d.c. measuring means

Claim 1

APPARATUS FOR TRANSLATING SIGNALS FROM A SOURCE OF ALTERNATING CURRENT SIGNALS TO OBTAIN AN INDICATION OF THE MAGNITUDE OF THE SIGNALS, SAID APPARATUS COMPRISING AN AMPLIFIER HAVING AN INPUT CIRCUIT AND AN OUTPUT CIRCUIT, FIRST SWITCHING MEANS OPERATING IN SYNCHRONISM WITH SAID SIGNAL SOURCE TO APPLY THE SIGNALS FROM SAID SOURCE TO SAID INPUT CIRCUIT DURING ALTERNATE HALF CYCLES OF SAID SIGNALS, SAID SWITCHING MEANS PERMITTING CURRENT FLOW BOTH TO AND FROM THE INPUT CIRCUIT DURING SAID ALTERNATE HALF CYCLES, A FIRST FEEDBACK CIRCUIT COUPLED BETWEEN SAID OUTPUT CIRCUIT AND SAID INPUT CIRCUIT, SAID FIRST FEEDBACK HAVING A SUBSTANTIALLY RESISTIVE IMPEDANCE TO ENABLE SAID AMPLIFIER TO REPRODUCE THE SIGNALS APPLIED TO SAID INPUT CIRCUIT, A SECOND FEEDBACK CIRCUIT COUPLED BETWEEN SAID OUTPUT CORCUIT AND SAID INPUT CIRCUIT, SAID SECOND FEEDBACK CIRCUIT HAVING A SUBSTANTIALLY CAPACITIVE TO THE MAGNITUDE OF SAID AN AMOUNT OF CHARGE EQUIVALENT TO THE MAGNITUDE OF SAID SIGNALS DURING SAID ALTERNATE HALF CYCLES AND TO HOLD SAID CHARGE DURING THE REMAINING HALF CYCLES OF SAID ALTERNATING CURRENT SIGNALS, DIRECT VOLTAGE MEASURING MEANS, AND A SECOND SWITCHING MEANS OPERATING IN SYNCHRONISM WITH SAID SIGNAL SOURCE TO PROVIDE A CONNECTION FROM SAID OUTPUT CIRCUIT TO SAID VOLTAGE MEASURING MEANS DURING THE REMAINING HALF CYCLES WHEN SAID CHARGE IS HELD AND MEANS CONNECTING ONE TERMINAL OF SAID SIGNAL SOURCE AND SAID MEASURING MEANS TO A COMMON REFERENCE POTENTIAL.