Television sync separator circuit with missing pulse detector controlling input reference level

Claim 1

IN A TELEVISION RECEIVING CIRCUIT, (A) A SYNCH SEPARATOR COMPRISING, (I) INPUT MEANS FOR RECEIVING A COMPOSITE SIGNAL, (II) A CAPACITOR CONNECTED TO SAID INPUT MEANS, (III) CHARGING AND DISCHARGING MEANS CONNECTED TO SAID CAPACITOR FOR CHARGING THE SAME DURING RECEIPT OF SYNC PULSES AND FOR DISCHARGING THE SAME AT A FIRST RELATIVELY SLOW RATE BETWEEN SYNC PULSES TO SET UP A SUBSTANTIALLY STEADY MEANS REFERENCE VOLTAGE ACROSS SAID CAPACITOR, (IV) AND OUTPUT MEANS CONNECTED TO SAID CHARGING AND DISCHARGING MEANS AND SENSITIVE TO SUCH CHARGING STEPS FOR EMITTING OUTPUT PULSES CORRESPONDING TO SEPARATED SYNC PULSES, (B) DETECTOR MEANS CONNECTED TO SAID OUTPUT MEANS FOR DETECTING PROLONGATION OF THE PERIODICITY OF SAID OUTPUT PULSES, SAID DETECTOR MEANS INCLUDING TRIGGER MEANS FOR EMITTING A SWITCHING PULSE UPON SUCH DETECTION, (C) AND DISCHARGE MEANS CONNECTED TO SAID TRIGGER MEANS AND TO SAID CAPACITOR AND RESPONSIVE TO A SAID SWITCHING PULSE, FOR DISCHARGING SAID CAPACITOR AT A SECOND RATE SUBSTANTIALLY FASTER THAN SAID FIRST RATE, FOR RAPID READJUSTMENT OF SAID REFERENCE VOLTAGE UPON RECEIPT OF A SAID SWITCHING PULSE.