Acoustic signaling system

Claim 1

A COMMUNICATION SYSTEM COMPRISING MEANS FOR TRANSMITTING THROUGH A MEDIUM INFORMATION CONTAINING A PLURALITY OF DIFFERENT FREQUENCY SIGNALS, A PAIR OF SAID SIGNALS REPRESENTING THE BITS OF A BINARY CODED MESSAGE AND SPACED BY ANOTHER OF SAID SIGNALS REPRESENTING TIMING BITS FILTER MEANS FOR SEPARATING SAID PLURALITY OF SIGNALS BINARY SHIFT REGISTER MEANS FOR STORING SAID PAIR OF SIGNALS REPRESENTING THE BITS OF THE BINARY CODED MESSAGE, SAID SIGNALS REPRESENTING TIMING BITS BEING APPLIED TO SHIFT SAID REGISTER MEANS TO SERIALLY STORE SAID PAIR OF SIGNALS GATE MEANS RESPONSIVE TO SAID STORED PAIR OF SIGNALS FOR GENERATING A SIGNAL TO ACTUATE A DEVICE, AND MEANS RESPONSIVE TO SAID SIGNALS REPRESENTING TIMING BITS FOR GENERATING A NEGATIVE SIGNAL TO RESET SAID REGISTER MEANS TO CLEAR THEREFROM SAID STORED PAIR OF SIGNALS.