SYSTEM OF HIDDEN PROTECTION OF CONFIDENTIAL ACOUSTIC INFORMATION FROM UNAUTHORIZED REMOVAL AND A FILM COATING FOR THIS SYSTEM Russian patent published in 2022 - IPC H03B29/00 H04M1/68 

FIELD: confidential acoustic information protection.

SUBSTANCE: inventions group relates to a system of hidden protection of confidential acoustic information from unauthorized removal and a film coating for it. The system of hidden protection of confidential acoustic information from unauthorized removal contains an absorbing-reflective film glued to the inner side of the glazing and piezoelectric emitters for excitation of mechanical vibrations of a chaotic nature on the elements of the window structure, which are fixed on a flexible conductive tape attached along the perimeter of the glazing on the specified film under the glazing seals in window construction. These piezo emitters are connected to the current-carrying elements of the said tape and connected to the vibroacoustic noise generator. The film is made flat and glued to the glazing with its edges placed under the seals of the window structure and is made multilayer, consisting of a spatter layer facing the glazing and cholesteric and low-emission layers located above it.

EFFECT: increasing the degree of protection against unauthorized retrieval of information by means of laser location systems for remote listening by changing the polarization of the transmitted signal from linear to circular while simultaneously forming a chaotic masking noise on all elements of the window.

4 cl, 5 dwg