Scanning circuit arrangements

Claim 1

A SCANNING CIRCUIT ARRANGED COMPRISING A PLURALITY OF INDIVIDUAL COINCIDING GATES EACH HAVING FIRST AND SECOND INPUTS AND AN OUTPUT DIVIDED INTO A NUMBER OF GROUPS, EACH SAID GROUP BEING FURTHER DIVIDED INTO A NUMBER OF SUB-GROUPS, A PLURALITY OF GROUPS OF OUTPUT COINCIDENCE GATES EACH HAVING FIRST AND SECOND INPUTS AND AN OUTPUT CORRESPONDING TO SAID PLURALTIY OF GROUPS OF INDIVIDUAL GATES, THE CORRESPONDING GATES FROM SAID SUBGROUPS HAVING THEIR OUTPUTS CONNECTED IN COMMON TO A FIRST INPUT OF AN INDIVIDAL ONE OF SAID OUTPUT GATES, A FIRST PULSE-DISTRIBUTING CYCLIC COUNTER HAVING FOR EACH SUB-GROUP OF GATES AN OUTPUT LEAD WHICH IS CONNECTED IN COMMON TO THE FIRST INPUTS OF ALL THE INDIVIDUAL GATES IN THAT SUB-GROUP, A SECOND PULSE-DISTRIBUTING COUNTER HAVIN A PLURALITY OF OUTPUT LEADS, THE OUTPUT GATES IN EACH GROUP THEREOF HAVING SECOND INPUTS RESPECTIVELY CONNECTED TO SAID SECOND COUNTER OUTPUT LEADS EACH IN COMMON WITH THE SECOND INPUTS OF THE CORRESPONDING OUTPUT GATES IN THE OTHER GROUPS THEREOF, MEANS FOR DRIVING SAID FIRST PULSE-DISTRIBUTING CYCLIC COUNTER TO PROVIDE AN OUTPUT SIGNAL ON EACH OF ITS OUTPUT LEADS RECURRENTLY IN TURN, SAID SECOND PULSE-DISTRIBUTING COUNTER BEING CONNECTED TO SAID FIRST COUNTER AND RECEIVING A STEPPING PULSE ONCE PER CYCLE OF THE LATTER TO PROVIDE OUTPUT SIGNALS SUCCESSIVELY ON ITS OUTPUT LEADS, EACH OF SAID INDIVIDUAL COINCIDENCE GATES HAVING A SECOND INPUT CONNECTED TO A CIRCUIT TO RECEIVE A MARKING SIGNAL THEREFROM, SAID SCANNING CIRCUIT ARRANGEMENT BEING SUCH THAT THE COINCIDENCE AT ONE OF THE INDIVIDUAL GATES OFA MARKING SIGNAL AND AN OUTPUT SIGNAL FROM SAID FIRST OCUNTER WILL CAUSE THAT GATE THE PASS A SIGNAL TO THE RELEVANT OUTPUT GATE WHILE THE COINCIDENCE AT AN OUTPUT GATE OF SUCH SIGNAL AND AN OUTPUT SIGNAL FROM SAID SECOND COUNTER WILL CAUSE THIS OUTPUT GATE TO PRODUCE A SIGAL ON THE OCCURRENCE OF WHICH THE COMBINED COUNT REACHED BY SAID FIRST AND SECOND COUNTERS WILL BE INDICATIVE OF THE MARKED GATE AND THUS OF THE CIRCUIT ASSOCIATED WITH IT.