Television signal converting apparatus

Claim 1

A TELEVISION SIGNAL CONVERSION APPARATUS WHEREIN PICTURES REPRODUCED ON A REPRODUCER TUBE BY INPUT TELEVISION SIGNALS IN ACCORDANCE WITH ONE SET OF TELEVISION STANDARDS HAVING A FIRST FIELD FREQUENCY ARE TELEVISED BY A VIEWING CAMERA TUBE TO PRODUCE OUTPUT SIGNALS IN ACCORDANCE WITH ANOTHER SET OF TELEVISION STANDARDS HAVING A SECOND, DIFFERENT, FIELD FREQUENCY COMPRISING GAIN ADJUSTING MEANS, THE GAIN OF WHICH IS CHANGED REPETITIVELY AT A FREQUENCY EQUAL TO THE DIFFERENCE BETWEEN THE TWO FIELD FREQUENCIES BY A GAIN CONTROL WAVEFORM SO AS SUBSTANTIALLY TO ELIMINATE FLICKER WHICH WOULD OTHERWISE OCCUR DUE TO THE FIELD FREQUENCY DIFFERENCE, A CHAIN COUNTER FOR PRODUCING SAID GAIN CONTROL WAVEFORM HAVING A CASCADED SUCCESSION OF TRIGGER TUBES AND MEANS FOR APPLYING INPUT PULSES AT THE TWO FIELD FREQUENCIES TO THE FIRST TUBE, SAID COUNTER INCLUDING MEANS BIASING SAID FIRST TUBE TO IGNITE ONLY WHEN SAID PULSES ARE SIMULTANEOUS, MEANS FOR CONNECTING EACH SUCCESSIVE TUBE TO RECEIVE INPUT FROM THE PRECEDING TUBE AND, SUPERIMPOSED THEREON, PULSES OCCURRING AT A SELECTED ONE OF THE FIELD FREQUENCIES, THE NUMBER OF TUBE IN THE COUNTER BEING THE SAME AS THE RATIO BETWEEN THE LOWEST COMMON MULTIPLE OF THE FIELD FREQUENCIES AND THE OTHER FIELD FREQUENCY, AND THE WHOLE ARRANGEMENT BEING SUCH THAT SAID TUBES IGNITE IN TURN, EACH FOR A FIELD PERIOD OF SAID SELECTED FIELD FREQUENCY AND A COMBINING NETWORK FOR COMBINING THE OUTPUTS OF THE TUBES TO PRODUCE SAID WAVE.