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

An ultrasonic and active cancellation technology, applied in the field of anti-eavesdropping and eavesdropping systems, can solve the problems of poor eavesdropping and eavesdropping equipment, inability to prevent eavesdropping and eavesdropping, and achieve the effect of preventing eavesdropping or eavesdropping and improving security.

Inactive Publication Date: 2015-11-11
NORTHWESTERN POLYTECHNICAL UNIV
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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 ultrasoni

Method used

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

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Embodiment Construction

[0034] In order to deepen the understanding of the present invention, the present invention will be further described below in conjunction with the embodiments and accompanying drawings.

[0035] The basic principle of the present invention is, as figure 2 As shown in Fig. 1, the effective audio information reverse signal and the interference audio information are used to modulate the ultrasonic wave, and then emit it. After the eavesdropping device receives the modulated ultrasonic wave, if the upper limit of the frequency band of the receiver is high and there is no good filter module, the modulated ultrasonic wave will enter the audio channel of the eavesdropping device and interfere with the effective audio information, making it impossible to achieve eavesdropping. purpose of recording. If the eavesdropping equipment has a good filter module or the upper limit of the receiver frequency band is low, the modulated ultrasonic wave will be filtered out, but the effective au...

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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...

Claims

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Application Information

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IPC IPC(8): G10K11/178
Inventor 王剑
Owner NORTHWESTERN POLYTECHNICAL UNIV
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