Ultrasonic active sound attenuation anti-eavesdrop and anti-wiretapping device, and anti-eavesdrop and anti-wiretapping method using the device

Abstract

The invention claims an ultrasonic active sound attenuation anti-eavesdrop and anti-wiretapping device, and an anti-eavesdrop and anti-wiretapping method using the device. The device comprises an ultrasonic generator which is used for generating ultrasonic signals, a valid audio frequency information gatherer which is used for gathering valid audio frequency information which may be eavesdropped and wiretapped, an inverter which is connected with the valid audio frequency information gatherer for performing backward processing of the valid audio frequency information and forming active sound attenuation interference audio frequency information, a modulator which can modulate the active noise reduction interference audio frequency information by taking the ultrasonic signals as carrier waves so as to form modulated ultrasonic signals, and an ultrasonic transmitter which is connected with the modulator for transmitting the modulated ultrasonic signals. The ultrasonic active sound attenuation anti-eavesdrop and anti-wiretapping device of the invention can interfere various types of eavesdropping and wiretapping devices in the prior art effectively, thus effectively preventing eavesdropping or wiretapping of conference information or military content, and improving safety of the information.

Description

technical field [0001] The present invention relates to an anti-eavesdropping and stealing recording device and an anti-eavesdropping and stealing recording method, in particular to an ultrasonic technology-based active noise reduction anti-eavesdropping and stealing recording device, a method for preventing wiretapping and stealing recording using the ultrasonic active noise reduction technology, and Anti-eavesdropping and stealing recording system based on ultrasonic active noise reduction technology. Background technique [0002] Eavesdropping or wiretapping refers to the use of certain technological means to obtain effective audio information such as conversations or other sounds in a covert manner. To a certain extent, it will cause damage to the party being eavesdropped or recorded. [0003] At present, most manufacturers use electromagnetic interference technology to carry out anti-eavesdropping and wiretapping, but because electromagnetic interference will make othe...

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Problems solved by technology

Similarly, it will not be able to achieve the ideal purpose of preventing wiretapping and wiretapping

[0008] Therefore, this technique of using this simple transmitted ultrasonic wave as a source of interference is not effective against advanced wiretapping devices with effective filtering modules and those with a lower upper band limit of the receiver

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