PIEZOELECTRIC CONVERTER TO GENERATE OSCILLATIONS IN BUILDING STRUCTURES Russian patent published in 2006 - IPC B06B1/06 H04R17/00 

FIELD: audio security systems adapted to protect room against non-authorized voice interception.

SUBSTANCE: piezoelectric converter is installed and secured in building structure body. The converter comprises bearing ring, upper and lower membranes fixed to bearing ring and upper and lower piezoelectric cells fastened to inner surfaces of upper and lower membranes correspondingly. The bearing ring has side orifice made in bearing ring body and adapted to receive pipe with electric cord passing through the pipe. The electric cord is connected with piezoelectric cell surfaces facing cavity and with inner surfaces of both membranes.

EFFECT: reduced parasite noise in room and simplified converter structure.

8 cl, 1 dwg