Automatic rest frequency control for pulsed frequency modulated oscillator

Claim 1

A SYSTEM FOR AUTOMATIC REST FREQUENCY CONTROL OF A PULSED FREQUENCY MODULATED OSCILLATOR COMPRISING: FREQUENCY MODULATED OSCILLATOR MEANS INCLUDING MEANS FOR CHANGING THE OUTPUT FREQUENCY THEREOF RESPONSIVE TO AN INPUT PULSE AND FOR CONTROLLING THE REST FREQUENCY RESPONSIVE TO A CONTROL SIGNAL; FIRST AND SECOND STABLE REFERENCE OSCILLATOR MEANS RESPECTIVELY HAVING FIXED OUTPUT FREQUENCIES EQUALLY ABOVE AND BELOW THE REST FREQUENCY OF SAID FREQUENCY MODULATED OSCILLATOR MEANS; FIRST AND SECOND MIXING MEANS EACH COUPLED TO A RESPECTIVE REFERENCE OSCILLATOR MEANS AND TO SAID FREQUENCY MODULATED OSCILLATOR MEANS FOR RESPECTIVELY PROVIDING FIRST AND SECOND DIFFERENCE FREQUENCY SIGNALS; FIRST AND SECOND FREQUENCY SENSITIVE AMPLIFIER MEANS COUPLED RESPECTIVELY TO SAID MIXING MEANS FOR RESPECTIVELY PROVIDING OUTPUT SIGNALS RESPONSIVE TO THE AMPLITUDE AND FREQUENCY OF SAID DIFFERENCE FREQUENCY SIGNALS; FIRST AND SECOND VOLTAGE DISCRIMINATOR MEANS RESPECTIVELY COUPLED TO SAID AMPLIFIER MEANS FOR RESPECTIVELY PROVIDING DIRECT CURRENT OUTPUT VOLTAGES OF OPPOSITE SIGN HAVING AN AMPLITUDE RESPONSIVE TO THE OUTPUT SIGNAL OF THE RESPECTIVE FREQUENCY-SENSITIVE AMPLIFIER MEANS; AND VOLTAGE COMBINING MEANS COUPLED TO SAID DISCRIMINATOR MEANS FOR COMBINING THE VOLTAGES PROVIDED THEREBY, SAID VOLTAGE COMBINING MEANS BEING COUPLED TO SAID FREQUENCY VARYING MEANS FOR CONTROLLING THE REST FREQUENCY OF SAID FREQUENCY MODULATED OSCILLATOR MEANS RESPONSIVE TO THE DIRECTION AND AMOUNT OF DEVIATION OF THE REST FREQUENCY FROM THE MIDPOINT BETWEEN THE OUTPUT FREQUENCIES OF SAID REFERENCE OSCILLATORS, EACH OF SAID DISCRIMINATOR MEANS COMPRISING A HALF-WAVE RECTIFIER COUPLED IN SERIES WITH THE RESPECTIVE AMPLIFIER MEANS AND A TIME CONSTANT CIRCUIT COUPLED ACROSS SAID RECTIFIER AND HAVING A PREDETERMINED TIME CONSTANT LONGER THAN THE DURATION OF SAID INPUT PULSE WHEREBY THE DISCRIMINATOR MEANS OUTPUT VOLTAGES DO NOT VARY AND THE FREQUENCY OF SAID FREQUENCY MODULATED OSCILATOR MEANS IS NOT CONTROLLED DURING AN INPUT PULSE, THE SAID HALF-WAVE RECTIFIER MEANS OF SAID DISCRIMINATOR MEANS BEING OPPOSITELY POLARIZED.