公开(公告)号：US10805721B2

公开(公告)日：2020-10-13

申请号：US16254680

申请日：2019-01-23

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Chi Hoon Choi ,  Ji Eun Choi ,  Young Jun Lee ,  Heesun Park ,  Young Hyoun Kwon ,  Sae-Hoon Ju ,  Kyung-Hoon Lee

IPC: H04R3/00

Abstract: An apparatus and method for preventing an electronic device from recording. The apparatus includes a control unit for generating a first modulation signal and controlling the components of the apparatus; a first modulation unit for modulating the first modulation signal to an FM signal; an ultrasonic signal generation unit for generating an ultrasonic signal, the frequency of which is adjusted by changing the value of at least one of a variable resistor and a variable capacitor depending on the magnitude of the FM signal; an amplification unit for increasing or decreasing the magnitude of the ultrasonic signal; a resonance unit for increasing the voltage to be applied to a transducer by generating resonance; and an ultrasound output unit for converting electrical signals into ultrasonic signals using the transducer and radiating a recording prevention signal, converted into the ultrasonic signal, to the microphone of an electronic device.

公开(公告)号：US10320518B2

公开(公告)日：2019-06-11

申请号：US15807917

申请日：2017-11-09

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Hui-Rae Cho ,  Jin-Hyun Kim ,  In-Ho Hwang ,  Sae-Hoon Ju ,  Kyung-Hoon Lee

IPC: H04L27/26 ,  H04K3/00

Abstract: An apparatus and a method for preventing an information leakage. The apparatus for preventing the information leakage includes a shielding signal pattern generation unit configured to generate a shielding signal pattern including a radiation band and a radiation suppression band; a shielding signal generation unit configured to generate an electromagnetic leakage shielding signal corresponding to an Orthogonal Frequency Division Multiplexing (OFDM) scheme by using the shielding signal pattern; a signal amplification unit configured to amplify a transmitting power of the electromagnetic leakage shielding signal; and an antenna unit configured to transmit the amplified electromagnetic leakage shielding signal.