Television deflection system including afc circuit with regenerative phase detector

Claim 1

IN A TELEVISION RECEIVER, THE COMBINATION COMPRISING MEANS FOR PROVIDING A SOURCE OF SYNCHRONIZING PULSE SIGNALS, A DEFLECTION WAVEFORM GENERATING CIRCUIT FOR PRODUCING A RECURRING DEFLECTION WAVEFORM INCLUDING TRACE AND RETRACE PORTIONS, OSCILLATOR MEANS COUPLED TO SAID GENERATING CIRCUIT FOR SUPPLYING A TRIGGERING SIGNAL THERETO TIMED TO INITIATE EACH SAID RETRACE PORTION PRIOR TO THE OCCURRENCE OF A CORRESPONDING SYNCHRONIZING PULSE, MEANS COUPLED TO SAID GENERATING CIRCUIT FOR PROVIDING A REFERENCE PULSE SIGNAL DURING SAID RETRACE PORTION, AN AUTOMATIC FREQUENCY CONTROL CIRCUIT INCLUDING FIRST AND SECOND GATING SIGNAL RESPONSIVE MEANS COUPLED RESPECTIVELY TO SAID REFERENCE PULSE SIGNAL MEANS AND TO SAID SYNCHRONIZING PULSE SIGNAL MEANS, SAID FIRST GATING SIGNAL RESPONSIVE MEANS BEING CONDITIONED FOR CONDUCTION BY SAID REFERENCE PULSE SIGNAL, SAID SECOND GATING RESPONSIVE MEANS BEING SIMILARLY CONDITIONED BY SAID SYNCHRONIZING PULSE SIGNAL, MEANS FOR COUPLING SAID FIRST AND SECOND GATING SIGNAL RESPONSIVE MEANS TOGETHER IN A REGENERATIVE CONFIGURAATION SUCH THAT SAID AUTOMATIC FREQUENCY CONTROL CIRCUIT PROVIDES A CONTROL SIGNAL REPRESENTATIVE OF THE TIME ACCURRENCE OF SAID SYNCHRONIZING PULSE SIGNAL WITH RESPECT TO SAID RETRACE PORTION, AND MEANS FOR SUPPLYING SAID CONTROL SIGNAL TO SAID OSCILLATOR.