Multitone data transmission system with data bits comprised of combinations of data tones and rest tones

Claim 1

A DATA TRANSMISSION SYSTEM COMPRISING: A CARD HAVING OPENINGS PUNCHED THEREIN, DIFFERENT GROUPS OF TWO OPENINGS REPRESENTING DIFFERENT BITS OF INFORMATION; MEANS FOR SEQUENTIALLY DETECTING EACH GROUP OF OPENINGS AND PRODUCING FIRST SIGNALS REPRESENTATIVE OF THE OPENINGS IN SAID DETECTED GROUP; MEANS INCLUDING NINE NORMALLY OPEN SWITCHES EACH CONNECTED TO A DIFFERENT ONE OF NINE TUNED CIRCUITS AND RESPONSIVE TO SAID SIGNALS FOR SIMULTANEOUSLY GENERATING TWO DIFFERENT DATA SIGNALS PRODUCED BY TWO OF SAID TUNED CIRCUITS WHEN TWO OF SAID NORMALLY OPEN SWITCHES CLOSE IN RESPONSE TO TWO OF SAID SIGNALS; MEANS COUPLED TO SAID FIRST-MENTIONED MEANS INCLUDING THREE OR GATES EACH RESPONSIVE TO ANY ONE OF THREE OF SAID FIRST SIGNALS AND CONNECTED TO A DIFFERENT NORMALLY CLOSED SWITCH CONNECTED TO A TUNNEL CIRCUIT FOR GENERATING, SIMULTANEOUSLY WITH SAID DATA SIGNALS, ONE OF THREE DIFFERENT REST SIGNALS PRODUCED BY ONE OF SAID TUNED CIRCUITS WHEN ONE OF SAID OR GATES RECEIVES NONE OF SAID SIGNALS AND IS NONCONDUCTIVE AND THE CONNECTED SWITCH REMAINS CLOSED AND FOR GENERATING SAID THREE REST SIGNALS DURING PERIODS WHEN NO DATA SIGNALS ARE GENERATED; AND, MEANS FOR TRANSMITTING SAID SIMULTANEOUSLY GENERATED DATA AND REST SIGNALS REPRESENTING BIT INFORMATION AND FOR TRANSMITTING SAID THREE REST SIGNALS DURING PERIODS WHEN NO DATA SIGNALS ARE TRANSMITTED TO SQUELCH UNDESIRED SIGNALS.