Non-linear coded signal decoder

Claim 1

IN AN ELECTRIC PULSE CODE COMMUNICATION SYSTEM USING RECURRENT GROUPS OF CODED PULSES OF CONSTANT DURATION AND EACH HAVING EITHER OF TWO POSSIBLE SIGNALLING CONDITIONS, A DECODER COMPRISING MEANS FOR RECEIVING SAID CODED PULSES FROM A COMMUNICATION LINK, A TIME BASE SYNCHRONIZED BY SAID RECURRENT PULSE GROUPS AND DELIVERING CONTROL PULSES, AT LEAST A CONDENSER, FIRST AND SECOND DIRECT-CURRENT-VOLTAGE SOURCES, RESPECTIVELY, DELIVERING A FIRST CONSTANT VOLTAGE AND A SECOND CONSTANT VOLTAGE LOWER THAN SAID FIRST CONSTANT VOLTAGE, FIRST SWITCH MEANS FOR CONNECTING SAID CONDENSER TO SAID FIRST SOURCE AND CHARGING IT TO SAID FIRST CONSTANT VOLTAGE AT A FIRST GIVEN TIME CONTROLLED BY PART OF SAID CONTROL PULSES, A PLURALITY OF RESISTORS, SECOND SWITCHING MEANS CONTROLLED BY SAID CODE PULSES AND BY PART OF SAID CONTROL PULSES FOR CONNECTING AT A SECOND GIVEN TIME LATER THAN SAID FIRST GIVEN TIME AT LEAST PART OF SAID RESISTORS IN PARALLEL CONNECTION BETWEEN THEM, AND A PERMANENT CONNECTION BETWEEN SAID SECOND SOURCE AND ALL SAID RESISTORS, FIRST GATE MEANS CONTROLLED BY A FURTHER PART OF SAID CONTROL PULSES FOR CONNECTING AT A THIRD TIME LATER THAN SAID SECOND GIVEN TIME SAID CONDENSER TO SAID PARALLEL-CONNECTED RESISTORS, SECOND GATE MEANS FOR SAMPLING THE VOLTAGE ACROSS SAID CONDENSER AT A STILL LATER TIME SPACED BY A PREDETERMINED INTERVAL FROM SAID THIRD TIME, AND THIRD GATE MEANS CONTROLLED BY A STILL FURTHER PART OF SAID CONTROL PULSES FOR IMPRESSING SAID SAMPLED VOLTAGE UPON A UTILIZATION CIRCUIT.