Double-frequency coded symbol reader

Claim 1

IN AN INFORMATION TRANSLATING SYSTEM WHEREIN FREQUENCY MODULATED PULSES REPRESENT A PLURALITY OF SYMBOLS AND EACH PULSE IS DIVIDED INTO A PLURALITY OF PORTIONS, EACH PORTION BEING MODULATED BY A SELECTED ONE OF A PLURALITY OF DIFFERENT FREQUENCIES, THE COMBINATION FREQUENCIES SELECTED FOR A GIVEN PULSE UNIQUELY DEFINING ONE OF SAID PLURALITY OF SYMBOLS, THE APPARATUS COMPRISING: A PLURALITY OF BANKS OF FREQUENCY SELECTIVE CHANNELS, A GIVEN BANK BEING ASSOCIATED WITH ONE OF SAID PULSE PORTIONS AND HAVING A PLURALITY OF FREQUENCY SELECTIVE CHANNELS CONNECTED BETWEEN A SOURCE OF SAID GIVEN PULSE AND A PLURALITY OF FREQUENCY-IDENTIFYING OUTPUT TERMINALS, ONE CHANNEL IN EACH BANK FOR EACH ONE OF SAID DIFFERENT FREQUENCIES, A GIVEN CHANNEL INCLUDING A FREQUENCY FILTER HAVING A CENTER FREQUENCY CORRESPONDING TO ONE OF SAID DIFFERENT FREQUENCIES FOR PASSING ENERGY OF THE SIGNAL PORTION ASSOCIATED WITH SAID GIVEN BANK OF CHANNELS, AN INTEGRATOR CONNECTED TO SAID FILTER MEANS FOR MEASURING THE ENERGY OF SAID FREQUENCY MODULATED PULSE PORTION PASSING THROUGH SAID FILTER MEANS, COMPARATOR MEANS FOR COMPARING THE ENERGY MEASURED BY SAID INTEGRATORS WITH THE ENERGY MEASURED BY ALL OF THE INTEGRATORS IN THE CHANNELS OF SAID GIVEN BANK TO IDENTIFY THE CHANNEL MEASURING THE MOST ENERGY AND PRODUCE A SIGNAL AT A CORRESPONDING OUTPUT TERMINAL; A PLURALITY OF SYMBOL-IDENTIFYING OUTPUT TERMINALS CORRESPONDING TO ONE OF SAID PLURALITY OF SYMBOLS; A PLURALITY OF DECODING GATES HAVING A PLURALITY OF INPUT TERMINALS AND AN OUTPUT TERMINAL, A GIVEN GATE HAVING AN INPUT TERMINAL CONNECTED TO A FREQUENCY-IDENTIFYING OUTPUT TERMINAL ASSOCIATED WITH ONE OF SAID CHANNELS IN EACH OF SAID BANKS, THE COMBINATION OF FREQUENCY-IDENTIFYING OUTPUT TERMINALS CONNECTED TO SAID GIVEN GATE CORRESPONDING TO A UNIQUE COMBINATION OF FREQUENCIES WHICH DEFINE THE SYMBOL ASSOCIATED WITH THE SYMBOL-IDENTIFYING TERMINAL CONNECTED TO SAID GIVEN GATE.