Phase shift keying communication system

Claim 1

IN A PHASE SHIFT COMMUNICATION SYSTEM FOR TRANSFERRING INFORMATION OVER A DISTANCE IN THE FORM OF A MODULATED CARRIER SHIFTING FROM ONE TO ANOTHER OF THREE EQUALLY SPACED PHASES ACCORDING TO AN INFORMATION SIGNAL, A RECEIVER INPUT STAGE CONNECTED TO PRODUCE AS AN OUTPUT SIGNAL AN AMPLIFIED COPY OF SAID MODULATED CARRIER, A PHASE DECTECTOR STAGE CONNECTED TO SAMPLE SAID OUTPUT SIGNAL DEVELOPED BY SAID RECEIVER INPUT STAGE, A SQUARING CIRCUIT ALSO CONNECTED TO SAMPLE THE OUTPUT SIGNAL PROVIDED BY SAID RECEIVER INPUT STAGE AND DEVELOPE A WAVE-TRAIN OF FLAT-TOPPED PULSES, A DIFFERENTIATING CIRCUIT CONNECTED TO RECEIVE SAID FLATTOPPED PULSES AND PRODUCE A SERIES OF TIME-SPACED VOLTAGE SPIKES RESPONSIVE THERETO, A PARALLEL RESONANT CIRCUIT CONNECTED TO RECEIVE SAID VOLTAGE SPIKES AND PRODUCE A TRIPLE FREQUENCY SINUSOIDAL SIGNAL RESPONSIVE THERETO, A FREQUENCY DIVIDER CONNECTED TO SAID PARALLEL RESONANT CIRCUIT FOR REDUCING TO ONE-THIRD THE FREQUENCY OF SAID SINUSOIDAL SIGNAL MEANS FOR SHIFTING THE PHASE OF SAID REDUCED FREQUENCY SIGNAL RELATIVE TO SAID OUTPUT SIGNAL AND FROM APPLYING THE PHASE SHIFTED SIGNAL AS A PHASE REFERENCE SIGNAL TO SAID DETECTOR STAGE FOR PRODUCING AND OUTPUT DIFFERENT FOR EACH OF THE THREE POSSIBLE RECEIVED PHASES OF MODULATED CARRIER.