METHOD OF PROTECTING ACOUSTIC INFORMATION Russian patent published in 2016 - IPC H04K1/02 

FIELD: physics.

SUBSTANCE: one version of the method of protecting acoustic information comprises installing a nonlinear converter (11) of a secondary electromagnetic noise signal in a facility to be protected in the immediate vicinity of an emitter (4) of an acoustic noise signal with a frequency spectrum whose width corresponds to the spectrum of the acoustic information signal, which is simultaneously the source of the secondary electromagnetic noise signal with the same frequency spectrum and statistical properties, said converter changing its frequency spectrum and statistical properties, thereby preventing compensation of the protective noise signal in eavesdropping equipment. In another version of the method the facility to be protected, near an emitter of an acoustic noise signal with a frequency spectrum whose width corresponds to the spectrum of the acoustic information signal, which is simultaneously the source of a secondary electromagnetic noise signal with the same frequency spectrum and statistical properties, is fitted with a nonlinear re-emitter-converter of the secondary electromagnetic noise signal, connected a generator, which performs intermodulation conversion of the secondary electromagnetic noise signal, thereby changing its frequency spectrum and statistical properties, thereby preventing compensation of the protective noise signal in eavesdropping equipment.

EFFECT: high effectiveness of protecting acoustic information by preventing compensation in eavesdropping equipment of a signal generated by a protective acoustic noise emitter.

2 cl, 10 dwg