Data transmission

Claim 1

A TRANSMITTER FOR A COMMUNICATION SYSTEM IN WHICH PAIRS OF SUCCESSIVE BINARY DIGITAL SIGNALS ARE ENCODED ON A PHASE-SHIFTED CARRIER WAVE OF A SINGLE FREQUENCY AS ONE OF EIGHT PRESELECTED RELATIVE PHASES COMPRISING A SERIAL DATA SOURCE, MEANS FOR CONVERTING THE OUTPUT OF SAID DATA SOURCE INTO TWO-BIT PARALLEL FORM, A CLOCK GENERATOR FOR SYNCHRONIZING THE OPERATIONS OF SAID TRANSMITTER AND FOR DETERMINING THE INTERVAL OF TIME DURING WHICH EACH SUCCESSIVE DIGIT PAIR IS TRANSMITTED, DECISIONAL LOGIC MEANS UNDER THE CONTROL OF SAID CLOCK GENERATOR FOR SAMPLING THE OUTPUT OF SAID CONVERTER AND FOR COMPUTING THE AMOUNT OF PHASE SHIFT NECESSARY TO TRANSMIT EACH PARTICULAR DIGIT PAIR ACCORDING TO A PREDETERMINED CODE, A MASTER OSCILLATOR FOR GENERATING A WAVE IN FIXED RELATION WITH THE FREQUENCY OF SAID CARRIER WAVE, MODULATOR MEANS RESPONSIVE TO THE OUTPUT OF SAID LOGIC MEANS FOR IMPARTING TO THE OUTPUT OF SAID MASTER OSCILLATOR THE PHASE SHIFT DETERMINED BY SAID LOGIC MEANS.