Variable frequency signal apparatus having a stabilizing reference signal

Claim 1

SIGNAL APPARATUS COMPRISING; AN INPUT CIRCUIT FOR RECEIVING A SIGNAL FREQUENCY FROM A SOURCE; A SOURCE OF REFERENCE FREQUENCY; MEANS CONNECTED TO THE SOURCE FOR RECEIVING SAID REFERENCE FREQUENCY AND TO THE INPUT CIRCUIT FOR RECEIVING THE SIGNAL FREQUENCY AT SAID INPUT CIRCUIT FOR PRODUCING A CONTROL SIGNAL REPRESENTATIVE OF THE PHASE RELATIONSHIP BETWEEN THE SIGNAL FREQUENCY AT SAID INPUT CIRCUIT AND AN INTEGER MULTIPLE OF THE REFERENCE FREQUENCY; MEANS CONNECTED TO ONE OF SAID SOURCES FOR APPLYING SAID CONTROL SIGNAL THERETO TO MAINTAIN PHASE LOCK BETWEEN THE SIGNAL FREQUENCY AT THE INPUT CIRCUIT AND AN INTEGER MULTIPLE OF THE REFERENCE FREQUENCY; CIRCUIT MEANS HAVING AN INPUT CONNECTED TO THE INPUT CIRCUIT FOR RECEIVING THE SIGNAL FREQUENCY AND HAVING ANOTHER INPUT; A SOURCE OF FIRST FREQUENCY EQUAL TO THE REFERENCE FREQUENCY OFFSET BY A SELECTED FREQUENCY VALUE; MEANS CONNECTING THE SOURCE OF FIRST FREQUENCY AND THE OTHER INPUT OF SAID CIRCUIT MEANS FOR APPLYING THERETO A FREQUENCY PROPORTIONAL TO THE FIRST FREQUENCY, SAID CIRCUIT MEANS PRODUCING AN OUTPUT SIGNAL AS A MODULATION PRODUCT OF THE FREQUENCIES OF SIGNALS APPLIED TO THE INPUTS THEREOF; A SOURCE OF SECOND SIGNAL PROPORTIONAL TO SAID SELECTED FREQUENCY VALUE; AND MEANS CONNECTED TO SAID CIRCUIT MEANS AND TO SAID SOURCE OF SECOND SIGNAL FOR PRODUCING A FIRST OUTPUT AS THE COMBINATION OF SAID OUTPUT SIGNAL AND SECOND SIGNAL, THE FIRST OUTPUT BEING REPRESENTATIVE OF THE NUMBER OF THE HARMONIC OF THE REFERENCE FREQUENCY TO WHICH THE SIGNAL FREQUENCY AT THE INPUT CIRCUIT IF PHASE LOCKED.