FIELD: radio engineering.
SUBSTANCE: method includes radiation of useful and masking signals, their addition, conversion of masking signal and its further rejection. Proposed method is characterized in that group of useful signals is radiated irrespective of masking signal and the latter is radiated in frequency band of entire group of useful signals; masking signal is shaped from narrow-band signal by expanding its spectrum using frequency or phase modulation whose mechanism is familiar for home receiver; all input signals including marking one are converted so that masking signal spectrum is contracted and spectrums of other input signals are expanded; then masking signal is rejected and remaining input signals are recovered.
EFFECT: enhanced security of narrow-band signal group transmission.
1 cl, 7 dwg
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