Audio compressor circuit

Claim 1

IN A COMPRESSOR CIRCUIT FOR DERIVING A SUBSTANTIALLY CONSTANT LEVEL OUTPUT SIGNAL VOLTAGE IN RESPONSE TO AN INPUT SIGNAL VOLTAGE WHICH VARIES BETWEEN DIFFERENT LEVELS, THE COMBINATION COMPRISING (A) INPUT MEANS FOR APPLYING SAID INPUT SIGNAL VOLTAGE TO SAID COMPRESSOR CIRCUIT, (B) A RESISTANCE CONNECTED TO ONE END TO SAID INPUT MEANS, (C) A UNILATERAL CONDUCTING MEANS CONNECTED BETWEEN THE OTHER END OF SAID RESISTANCE AND A POINT OF REFERENCE POTENTIAL, (D) SQUELCH CIRCUIT MEANS CONNECTED TO SAID INPUT MEANS FOR FORWARD BIASING SAID UNILATERAL CONDUCTING MEANS ONLY WHEN AN INPUT SIGNAL VOLTAGE BELOW A GIVEN LEVEL IS APPLIED TO SAID INPUT MEANS, (E) CONTROL VOLTAGE GENERATING MEANS CONNECTED BETWEEN SAID INPUT MEANS AND SAID OTHER END OF SAID RESISTANCE FOR DERIVING A DIRECT CURRENT FORWARD BIASING VOLTAGE WHICH VARIES IN SUBSTANTIALLY DIRECT PROPORTION TO SAID INPUT SIGNAL VOLTAGE, (F) SAID UNILATERAL CONDUCTING MEANS HAVING A DYNAMIC RESISTANCE WHICH VARIES SUBSTANTIALLY INVERSELY WITH SAID DIRECT CURRENT FORWARD BIASING VOLTAGE SUCH THAT SAID UNILATERAL CONDUCTING MEANS PROVIDES A VARIABLE RESISTANCE BETWEEN SAID RESISTANCE AND SAID REFERENCE POTENTIAL, (G) SAID UNILATERAL CONDUCTING MEANS BEING FULLY CONDUCTING IN RESPONSE TO A GIVEN LEVEL OF SAID DIRECT CURRENT FORWARD BIASING VOLTAGE, AND (H) OUTPUT MEANS CONNECTED BETWEEN SAID OTHER END OF SAID RESISTANCE AND SAID UNILATERAL CONDUCTING MEANS.