Phase-modulation transmitter

Claim 1

APPARATUS FOR INCREMENTALLY PHASE-SHIFTING A CARRIER WAVE IN ACCORDANCE WITH A BINARY DATA SIGNAL COMPRISING PULSE GENERATOR MEANS FURNISHING AN OUTPUT HARMONICALLY RELATED TO THE FREQUENCY OF SAID CARRIER WAVE, A SOURCE OF PAIRED BINARY DATA DIBITS OCCURRING AT A SYNCHRONOUS RATE, COUNT LOGIC MEANS FOR PRODUCING A FIRST OUTPUT WHENEVER A DATA PAIR CONTAINS UNLIKE ELEMENTS AND A SECOND OUTPUT WHENEVER THE INITIAL DATA PAIR DIGIT IS A MARKING ELEMENT, PHASE LOGIC MEANS UNDER THE CONTROL OF THE FIRST AND SECOND OUTPUTS OF SAID COUNT LOGIC MEANS FOR ESTABLISHING AN INITIAL PHASE FOR SAID CARRIER WAVE AT EACH DIBIT INTERVAL, TWO CHANNELS COUNTING DOWN FROM THE OUTPUTS OF SAID PULSE GENERATOR MEANS TO THE FREQUENCY OF SAID CARRIER WAVE, THE PHASE RELATIONSHIP BETWEEN SAID TWO CHANNELS BEING MAINTAINED AT AN ODD MULTIPLE OF 45 ELECTRICAL DEGREES, MEANS FOR SETTING THE PHASES OF SAID TWO CHANNELS ALTERNATELY TO A REFERENCE STATE EVERY DIBIT PERIOD, AND MEANS FOR GATING THE OUTPUT OF SAID PHASE LOGIC MEANS ALTERNATELY TO SAID CHANNELS TO CONTROL THE INITIAL PHASE THEREOF WITH RESPECT TO THE REFERENCE STATE, AND MEANS FOR ADDING THE OUTPUTS OF SAID TWO CHANNELS TO FORM A SINGLE PHASE-MODULATED LINE SIGNAL.