METHOD FOR REMOTE CAPTURE OF VOICE INFORMATION FROM PROTECTED ROOM Russian patent published in 2015 - IPC H04K3/00 

FIELD: radio engineering, communication.

SUBSTANCE: invention can be mainly used for remote capture of confidential voice information from a protected room (PR) using electric sounding of technical means (TM) located in this room and vibrating under action of acoustic waves carrying the voice information. The method for remote capture of voice information from PR is based on generation of a harmonic electric signal and by its sounding via lead-in wire of TS located in PR, reception and detection of the electric signal reversely reflected from TM and modulated by voice. Frequency of the sounding signal is chosen equal to half upper boundary frequency of voice spectrum, and detection of the modulated signal is performed by single-band demodulation of its upper side band.

EFFECT: providing efficient capture of voice information under conditions of counteraction using high-frequency filtration of signals in lead-in TM wire.

9 dwg