FIELD: measures taken against commercial and industrial espionage. SUBSTANCE: in case of detection of parametric micromodulation effect in radio-electronic equipment and acoustoelectronic channels through which information is drained over communication lines excitation signal is generated for communication-line-investigated-equipment system , adjusted to phase-frequency characteristics of system, amplified in power, and entered in communication line at optimal matching of input circuit with wave parameters of communication line. Response signal parametrically modulated in amplitude and/or phase is selected and demodulated by means of correlation demodulator with complex signal sensors built around current and voltage sensors of communication line. Separated low-frequency modulation signal is amplified and listened to in headphones; excitation frequency control is ceased in case noise is clearly heard in headphones. EFFECT: enhanced effectiveness of information drain channel detection due to demodulating low-modulation-level signal. 5 cl, 1 dwg
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