Double bridge network for producing signals having a modulation envelope phase difference

Claim 1

AN ELECTRONIC GONIOMETER FOR SUBJECTING A CARRIER WAVE TO MODULATION INFORMATION TO PRODUCE A PAIR OF DOUBLE SIDE BAND, SUPPRESSED CARRIER SIGNALS CONTAINING SAID INFORMATION AND HAVING A PREDETERMINED, RELATIVE MODULATION ENVELOPE PHASE DIFFERENCE, SAID GONIOMETER COMPRISING: A NETWORK INCLUDING A PAIR OF BRIDGES HAVING SEPARATE OUTPUTS, EACH OF SAID BRIDGES BEING PROVIDED WITH AN INPUT; MEANS COUPLED WITH THE BRIDGE INPUTS FOR FEEDING SAID CARRIER WAVE THERETO, EACH OF SAID BRIDGES COMPRISING A PLURALITY OF ARMS EACH HAVING AN ELECTRICALLY CONTROLLABLE, VARIABLE IMPEDANCE DEVICE THEREIN OPERABLE TO VARY THE STATE OF THE RESPECTIVE BRIDGE AT THE OUTPUT THEREOF BETWEEN A BALANCED CONDITION AND AN UNBALANCED CONDITION; AND MODULATION MEANS COUPLED WITH SAID DEVICES FOR APPLYING CONTROL SIGNALS THERETO TO VARY THE IMPEDANCES OF THE ARMS OF THE BRIDGES IN ACCORDANCE WITH THE CHARACTERISTICS OF SAID MODULATION INFORMATION AND TO EFFECT ALTERNATE BALANCING OF SAID BRIDGES, WHEREBY TO PROVIDE SAID SUPPRESSED CARRIER SIGNALS AT RESPECTIVE BRIDGE OUTPUTS.