Three-level binary code transmission

Claim 1

APPARATUS FOR CONVERTING A TWO-VALUED BINARY CODE TRAIN OF ON AND OFF PULSES HAVING A BASIC PULSE REPETITION FREQUENCY AND A POWER DENSITY SPECTRUM WITH DISCRETE COMPONENTS AT ZERO FREQUENCY AND AT SAID BASIC PULSE REPETITION FREQUENCY AND WITH A SUBSTANTIAL CONTINUOUS COMPONENT AT BOTH ZERO FREQUENCY AND SAID BASIC PULSE REPETITION FREQUENCY, WHERE SAID ON AND OFF PULSES ARE RESPECTIVELY DIFFERENT ENERGY LEVELS AND ALL OF SAID ON PULSES HAVE THE SAME POLARITY WITH RESPECT TO SAID OFF PULSES, INTO A THREE-LAVUED PULSE TRAIN HAVING A POWER DENSITY SPECTRUM WITH NO DISCRETE COMPONENTS AND WITH A CONTINUOUS COMPONENT WHICH HAS NULLS AT ZERO FREQUENCY AND SAID BASIC PULSE REPETITION FREQUENCY AND ITS FIRST PEAK AT LESS THAN HALF SAID BASIC PULSE REPETITION FREQUENCY WHICH COMPRISES MEANS FOR SELECTING SUCCESSIVE GROUPS OF N CONSECUTIVE ON PULSES FROM SAID TWO-VALUED BINARY CODE TRAIN, WHERE N IS AN INTEGER GREATER THAN UNITY, AND MEANS FOR INVERTING WITH RESPECT TO THE OFF PULSES THE POLARITY OF ALL OF THE ON PULSES OF ALTERNATE ONES OF SAID SELECTED GROUPS WHILE LEAVING THE OFF PULSES SUBSTANTIALLY UNDISTURBED.