Controllable signal transmission network

Claim 1

A GAIN CONTROL CIRCUIT FOR SELECTIVELY VARYING THE DYNAMIC RANGE OF A SIGNAL IN ELECTRONIC AMPLIFYING CIRCUITRY COMPRISING SIGNAL TRANSFORMING MEANS HAVING A PRIMARY WINDING AND TWO SECONDARY WINDING PORTIONS, MEANS FOR APPLYING AN INPUT SIGNAL TO SAID PRIMARY WINDING, MEANS FOR CONNECTING SAID SECONDARY WINDING PORTIONS WHEREBY SIGNALS OF OPPOSITE PHASE ARE PRODUCED BETWEEN A COMMON TERMINAL OF SAID SECONDARY WINDING AND, RESPECTIVELY, THE FIRST AND THE SECOND END TERMINAL OF SAID SECONDARY WINDING, A FIRST JUNCTION DIODE AND A FIRST CAPACITOR SERIALLY CONNECTED TO THE FIRST END TERMINAL, A SECOND JUNCTION DIODE AND A SECOND CAPACITOR SERIALLY CONNECTED TO THE SECOND END TERMINAL, MEANS FOR CONNECTING SAID FIRST AND SECOND CAPACITOR TO A COMMON INPUT TERMINAL OF A LOAD CIRCUIT, MEANS FOR APPLYING A FIXED REFERENCE POTENTIAL BETWEEN SAID COMMON TERMINAL AND THE JUNCTION OF SAID FIRST JUNCTION DIODE AND SAID FIRST CAPACITOR WHEREBY SAID FIRST JUNCTION DIODE IS BACK-BIASED, MEANS FOR APPLYING A VARIABLE GAIN CONTROL VOLTAGE BETWEEN SAID COMMON TERMINAL AND THE JUNCTION OF SAID SECOND JUNCTION DIODE AND SAID SECOND CAPACITOR WHEREBY SAID SECOND JUNCTION DIODE IS NORMALLY BACK-BIASED.