START-STOP COMMUNICATION SYSTEM WITH SIGNAL FREQUENCY KEYING Russian patent published in 2009 - IPC H04L25/38 

FIELD: information technology.

SUBSTANCE: proposed start-stop communication system pertains to wireless communication and can be used in different communication lines. The start-stop communication system with signal frequency keying has on the transmission side an information source, first shift register, OR circuit, carrier frequency generator, transmitter, first trigger flip-flop, first AND circuit and a pseudorandom sequence generator. On the receiving side, the system has a receiver, frequency discrimination circuit, interrupter switch, matched filter, decision device, pulse former, non-linear element, first adder, delay line, second adder, threshold device, RS-trigger, first key, comparator, second shift register, second key, minimum signal selection circuit, N switches, second trigger flip-flop and a second AND circuit.

EFFECT: increased noise immunity of communication.

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