Synchronizing signal separator making use of forward and reverse space charge currents

Claim 1

IN A TELEVISION RECEIVER IN WHICH HORIZONTAL SYCHRONIZING PULSES SERVE TO CONTROL A HORIZONTAL DEFLECTION SYSTEM IN WHICH PULSES ARE PRODUCED THAT ARE INDICATIVE OF THE TIMING OF THE HORIZONTAL DEFLECTION CYCLES, A HORIZONTAL PHASE COMPARATOR COMPRISING: AN ELECTRON TUBE HAVING A CATHODE A GRID, AND AT LEAST TWO OTHER ELECTRODES IN SUCCESSION; MEANS FOR SUPPLYING SAID HORIZONTAL SYNCHRONIZING PULSES TO SAID GRID; MEANS FOR UTILIZING SAID TIMING-INDICATIVE PHASE TO SUPPLY TO SAID TWO ELECTRODES VOLTAGES WHICH CAUSE NORMAL AND REVERSE SPACE CURRENTS TO FLOW IN SAID TUBE ACCORDING TO THE TIMING OF SAID DEFLECTION CYCLES IN RELATION TO SAID HORIZONTAL SYNCHRONIZING PULSES, THE AVERAGE NORMAL AND REVERSE CURRENTS BEING EQUAL AND CANCELLING ONE ANOTHER WHEN THE HORIZONTAL DEFLECTION SYSTEM IS SYNCHRONIZED WITH SAID HORIZONTAL SYNCHRONIZING PULSES; AND MEANS FOR DERIVING A CONTROL VOLTAGE ACCORDING TO UNBALANCE OF THE AVERAGE NORMAL AND REVERSE CURRENTS DUE TO NON-SYNCHRONIZATION OF THE HORIZONTAL DEFLECTION SYSTEM WITH THE HORIZONTAL SYNCHRONIZING PULSES.