ULTRASONIC ACOUSTIC DEVICE FOR SUPPRESSION OF SPEECH INFORMATION RECORDING DEVICES Russian patent published in 2020 - IPC H04K3/00 

FIELD: physics.

SUBSTANCE: invention relates to protection of information and can be used to counter unauthorized obtaining information using devices for detecting information using microphones. Ultrasonic acoustic device for suppression of speech information recording devices, comprising power supply unit 1, unit comprising serially connected generator, amplifier, filter, emitter, characterized by that device comprises swinging frequency unit 12, consisting of oscillating frequency signal generator 10, connected to power supply unit 1, output of signals of swinging frequency unit 7 connected to input of power amplifier, high-frequency filter of swinging frequency unit 8, input of swinging frequency unit 7 connected to output of power amplifier of swinging frequency unit, and by output with input of radiator of swinging frequency unit 9, modulator 6, input/output of which is connected to generator of swing frequency 10, wherein modulator 6 generates signals of saw-tooth shape with frequency of 10–15 Hz with amplitude required for frequency ramping of master LC circuit of oscillation frequency generator 10 signals.

EFFECT: technical result is high efficiency of suppressing microphones used for unauthorized information retrieval.

1 cl, 1 dwg