SHIELDED BOX WITH THE FUNCTION OF ULTRASONIC SUPPRESSION OF THE SOUND RECORDING PATH OF AN ELECTRONIC DEVICE PLACED INSIDE Russian patent published in 2022 - IPC G10K11/175 H04K3/00 

FIELD: anti-espionage technology.

SUBSTANCE: invention relates to anti-espionage technology. The box contains a box body made of an electrically conductive material, an ultrasonic suppressor for microphones of smartphones and voice recorders of an electronic device, located inside the case and containing a battery connected by electrical circuits, an ultrasonic generator and three ultrasonic emitters arranged in such a way that the radiation pattern of said ultrasonic emitters is directed to the electronic device placed inside a shielded box containing a sound recording device. The ultrasonic suppressor of microphones of smartphones and voice recorders of an electronic device is made autonomous. The ultrasonic suppressor is configured to generate interference in the form of ultrasonic waves with a frequency of 24-26 kHz. The shielded box is designed with a shielding efficiency of at least 60 dB in the frequency range from 30 MHz to 6 GHz. The shielded box is designed to block the following interfaces: GPS/Glonass; GSM/3G/4G/5G; WiFi, Bluetooth; NFC. The body of the box is made of aluminum with a wall thickness of at least 1.5 mm.

EFFECT: obtaining complete shielding of the electromagnetic field of the smartphone, as well as blocking the sound recording device built into the smartphone.

12 cl, 6 dwg