Self-adaptive interference adjustment method based on microphone nonlinear anti-eavesdropping

• Main Authors: ZHANG GUOMING, PU YUNLONG, HAN ZHICHENG, HU PENGFEI, YU DONGXIAO
• Format: Patent
• Language: Chinese; English
• Published: 11.07.2023
• Subjects: DEAF-AID SETS; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKEACOUSTIC ELECTROMECHANICAL TRANSDUCERS; PUBLIC ADDRESS SYSTEMS

The invention belongs to the technical field of information security, and particularly relates to an adaptive interference adjustment method based on microphone nonlinear anti-eavesdropping. The method comprises the following steps of: 1, constructing an interference signal: separating the interference signal into four 4kHz bandwidth frequency bands through a band-pass filter; self-adaptive control is carried out on the separated signals of the four different frequency bands; the divided four bandwidth frequency bands respectively correspond to three different ultrasonic sensor center frequencies and sampling frequencies of eavesdropping equipment; step 2, interference signal transmission: enhancing the signal of the center frequency; carrying out self-adaptive adjustment on the overall power of the interference signal through a power amplifier; then the interference signal is sent through an ultrasonic sensor array; the ultrasonic sensor array is composed of three kinds of ultrasonic sensors with different c