METHOD FOR CONCEALED SUPPRESSION OF EAVESDROPPING DEVICE, CONTAINING A MICROPHONE AMPLIFIER
FIELD: radio engineering. ^ SUBSTANCE: in accordance to concealed eavesdropping device suppression method, which device contains microphone amplifier, ultrasound is generated in form of bi-harmonic oscillation, frequencies f1 and f2 of which are selected from condition of occurrence of combination f...
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Zusammenfassung: | FIELD: radio engineering. ^ SUBSTANCE: in accordance to concealed eavesdropping device suppression method, which device contains microphone amplifier, ultrasound is generated in form of bi-harmonic oscillation, frequencies f1 and f2 of which are selected from condition of occurrence of combination frequency f3 in spectral range of speech, equal to |2f1-f2|, if f2>f1, and |2f2-f1| if f2 |
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