Phase modulator

Claim 1

A PHASE MODULATOR FOR SYMMETRICALLY PHASE MODULATING A CARRIER FREQUENCY SIGNAL TO BE TRANSMITTED COMPRISING, AN OSCILLATOR SOURCE FOR GENERATING AN OUTPUT SIGNAL OF PREDETERMINED FREQUENCY, A FIRST GATE CIRCUIT CONNECTED TO RECEIVE SAID OSCILLATOR OUTPUT SIGNAL AS AN INPUT AND BEING OPERABLE SELECTIVELY TO OPENED AND CLOSED CONDITIONS FOR PASSING AND BLOCKING RESPECTIVELY SAID INPUT SIGNAL, A DELAY CIRCUIT CONNECTED IN CIRCUIT PARALLEL WITH SAID FIRST GATE CIRCUIT TO ALSO RECEIVE SAID OSCILLATOR OUTPUT SIGNAL AS AN INPUT AND BEING EFFECTIVE TO CAUSE A PREDETERMINED DELAY OF SAID INPUT SIGNAL, A SECOND GATE CIRCUIT CONNECTED TO RECEIVE SAID DELAYED SIGNAL FROM SAID DELAY CIRCUIT AS AN INPUT AND BEING OPERABLE SELECTIVELY TO OPENED AND CLOSED CONDITIONS FOR PASSING AND BLOCKING RESPECTIVELY SAID DELAYED INPUT SIGNAL, ADDING MEANS CONNECTED TO RECEIVE AND ADD TOGETHER THE OUTPUTS OF SAID FIRST AND SECOND GATE CIRCUITS TO DERIVE SAID CARRIER FREQUENCY SIGNAL TO BE TRANSMITTED, AND CONTROL MEANS RESPONSIVE TO THE INFORMATION TO BE PHASE MODULATED ON SAID CARRIER FREQUENCY SIGNAL FOR SELECTIVELY OPENING AND CLOSING SAID FIRST AND SECOND GATE CIRCUITS IN SUCH A MANNER THAT BOTH OF SAID FIRST AND SECOND GATE CIRCUITS ARE CONCURRENTLY OPENED TO REPPRESENT THE UNMODULATED STATE OF SAID CARRIER FREQUENCY SIGNAL, WHEREAS EACH OF SAID FIRST AND SECOND GATE CIRCUITS ARE OPENED INDIVIDUALLY IN SUCCESSION FOR EACH BIT OF SAID INFORMATION TO CAUSE EQUAL PHASE ADVANCE AND PHASE DELAY RESPECTIVELY OF SAID CARRIER FREQUENCY SIGNAL DURING MODULATION FOR EACH INFORMATION BIT, WHEREBY THE INTEGRATED PHASE SHIFT OF SAID CARRIER FREQUENCY SIGNAL OVER THE TIME INTERVAL OF EACH INFORMATION BIT IS MINIMIZED.