FIELD: security communication devices. SUBSTANCE: transmitting part of device has amplifier 1, analog-to-digital converter 2, modulo-two adder 3, encoded sequence generator 4, digital-to-analog converter 5, adder 6, controlled switch 7, clock 8 and threshold unit 9. Receiving part of device has low-pass filter 10, analog-to-digital converter 11, modulo two adder 12, encoded sequence generator 13, digital-to- analog converter 14, narrow band filter 15 and clock synchronization signals generator 16. EFFECT: increased reliability. 2 cl, 2 dwg
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