Frequency-shift-keyed signal generator with phase mismatch prevention means

Claim 1

A GENERATOR OF FREQUENCY SHIFT KEYED BINARY TELEGRAPH SIGNALS OF THE COSINE TYPE, COMPRISING, MEANS TO GATE ONTO AN OUTPUT LINE A FULL CYCLE OF A COSINUSOIDAL WAVE OF FREQUENCY F IN RESPONSE TO AN INPUT BINARY SIGNAL OF ONE TYPE AND MEANS TO GATE ONTO SAID OUTPUT LINE A HALF CYCLE OF A COSINUSOIDAL SIGNAL OF FREQUENCY F/2 IN RESPONSE TO AN INPUT BINARY SIGNAL OF AN OPPOSITE TYPE AND MEANS TO CONTROL THE PHASE OR POLARITY OF THE COSINUSOIDAL SIGNAL IN ANY GIVEN BAUD IN ACCORDANCE WITH THE NUMBER OF OPPOSITE TYPE SIGNALS WHICH PRECEDED IT, SAID LASTNAMED MEANS COMPRISING MEANS TO DETERMINE WHETHER THE NUMBER OF CONSECUTIVE SIGNALS OF SAID OPPOSITE TYPE IS ODD OR EVEN, THEREBY PROVIDING A SMOOTHLY VARYING OUTPUT SIGNAL WITH NO PHASE MISMATCH THEREIN.