Two polarity automatically variable audio noise limiter

Claim 1

A TWO POLARITY AUDIO NOISE LIMITER HAVING A VARIABLE CLIPPING LEVEL FOR BOTH POLARITIES OF THE DETECTED AUDIO ENVELOPE WITH THE CLIPPING LEVELS VARYING FOR BOTH POLARITIES SUBSTANTIALLY AT THE AUDIO RATE AND SUBSTANTIALLY AT THE AUDIO SIGNAL LEVEL, INCLUDING: AN AUDIO SIGNAL INPUT TERMINAL; FIRST AND SECOND DIODES, EACH HAVING A CATHODE AND AN ANODE, AND HAVING UNLIKE POLES COUPLED TO SAID INPUT TERMINAL; FIRST AND SECOND VOLTAGE DROPPING MEANS CONNECTED IN SHUNT WITH SAID FIRST AND SECOND DIODES, RESPECTIVELY; A FIRST VOLTAGE REFERENCE SOURCE VOLTAGE REFTHE OTHER POLE OF SAID FIRST DIODE; A SECOND VOLTAGE REFERENCE SOURCE CONNECTED TO THE OTHER POLE OF SAID SECOND DIODE; A FIRST TRANSISTOR COUPLED TO THE COMMON JUNCTION OF SAID FIRST AND SECOND DIODES AND SAID FIRST AND SECOND VOLTAGE DROPPING MEANS; SAID FIRST TRANSISTOR HAVING AN OUTPUT ELECTRODE: RECTIFYING MEANS COUPLED TO SAID OUTPUT ELECTRODE; A SECOND TRANSISTOR WITH A CONTROL ELECTRODE CONNECTED TO SAID RECTIFYING MEANS, A SECOND ELECTRODE CONNECTED TO A VOLTAGE SUPPLY, AND A THIRD ELECTRODE CONNECTED TO SAID OTHER POLE OF THE FIRST DIODE AS SAID FIRST VOLTAGE REFERENCE SOURCE; OUTPUT SIGNAL PATH CIRCUIT MEANS FROM THE COMMON JUNCTION OF SAID FIRST AND SECOND DIODES TO AN OUTPUT TERMINAL TO SAID NOISE LIMITER FOR PASSING A SIGNAL OUTPUT FROM SAID NOISE LIMKTER; AND INCLUDING CAPACITIVE MEANS AND RESISTIVE MEANS COUPLED BETWEEN SAID CONTROL ELECTRODE OF SAID SECOND TRANSISTOR AND SAID SECOND VOLTAGE REFERENCE SOURCE HAVING CIRCUIT TIME CONSTANT CHARACTERISTICS PROVIDING VARIATION OF VOLTAGE APPLIED TO SAID CONTROL ELECTRODE OF SAID TRANSISTOR, AND VARIATION OF VOLTAGE DEVELOPED AT THE THIRD ELECTRODE OF SAID SECOND TRANSISTOR FOLLOWING SIGNAL VARIATIONS AT SUBSTANTIALLY THE AUDIO RATE.