The protection device voice information from unauthorized removal


The invention relates to techniques for optical communication and is designed to protect the voice data from eavesdropping. The technical result consists in increasing the efficiency of protection of verbal information from unauthorized access. For this purpose, in the device containing the continuous laser radiation, power supply and case, entered the photodetector, amplifier, control unit, generator, speech-like signals, an optical modulator and forming an optical relay system. 2 Il.

The proposed technical device relates to the field of optics, in particular to devices for the protection of verbal information from eavesdropping and recording using laser acoustic location systems.

Known devices intended to protect speech information in the premises in which the window glass serves oscillations with amplitude, clearly exceeds the amplitude of the vibrations of the human voice (see, for example, “Spy stuff” and device for protection of objects and information. Reference book /Ed. by S. Zolotarev A. - S.-Pb.: The DOE. 1996, S. 134-135).

The disadvantages of such devices are mainly in the so-called “acoustic white noise” eno is C the remaining part of the spectrum of acoustic noise using the decomposition in amplitude and frequency quite easily distinguished modulating oscillations, inherent in the voice of a man.

Also known device using the laser, creating noise sasvetochka interference photodetector laser acoustic locating system. In such devices the laser radiation is directed onto the reflective surface of the premises so that the reflected signal from them was much higher than the amplitude of the reflected laser signal to the listening device (see Review active technical means of information protection), 1997, No. 6, S. 61-63).

The closest proposed device is a laser device interference, described in the book Khoreva A. A. Ways and means of information protection. - M, defense Ministry, 1998, S. 69-70, 79, adopted as a prototype.

In Fig.1 shows a functional diagram of the device of the prototype showing: 1 - continuous laser radiation; 2 - power supply; 3 - case.

The device prototype has the following functional relation.

In case 3 is rigidly fixed to the continuous laser radiation 1 and power supply 2.

The device prototype works as follows.

At the time of the exchange of information enables the continuous laser radiation 1. Facing the laser beam is directed on box in a wide angle, covering practically the entire polusobrannom laser acoustic location systems (RTLS). Because the amplitude of this total signal exceeds the amplitude of the “listening” signal, that is “light-sensitive layer of the sensor and it does not provide useful (listening) signals.

The drawback of the prototype is that to ensure reliable suppression of the photodetector laser acoustic locating system requires a lot of power laser radiation, making it unsafe for people (your eyes), being in the room.

In addition, the continuous (CW) laser operation is not economically profitable.

Objectives of the invention are: enhancing the protection of verbal information from unauthorized access; reducing the cost of protecting the premises from unauthorized eavesdropping.

Solving these problems is achieved that the device containing the continuous laser radiation, power supply and case, entered sequentially electrically connected to the photodetector, amplifier, control unit, generator, speech-like signals, an optical modulator and forming an optical relay system. Optical input of the modulator is connected to the output of the laser continuous theme. One output of the control unit is electrically connected to the input of the continuous laser radiation, and the second output from the generator input speech-like signals. The generator output is speech-like signals is connected to the electrical input of the optical modulator.

The inclusion of these elements will improve the efficiency of the detection laser irradiation areas, creating a listening device laser noise speech-like signals and thereby to protect the premises from unauthorized retrieval of verbal information.

In Fig.2 shows a functional diagram of the proposed device, where we have introduced the following notation: 1 - photodetector; 2 amp; 3 - generator speech-like signals; 4 - control unit; 5 - power supply; 6 - forming a transmitting optical system; 7 - optic modulator; 8 - continuous laser radiation; 9 - case.

The proposed device has the following functional relationships. The output of the photodetector 1 is electrically connected to the input of the amplifier 2, the output of which is electrically connected through the series-connected control unit 4 and the generator speech-like signal 3 to the input of the optical modulator 7. The input of the photodetector 1 is simultaneously input device. Posledovatelno optically connected with the optical modulator 7 and forming a transmitting optical system 6, which is the output device.

The output of the power supply unit 5 is electrically connected to the inputs of a sensor 1, an amplifier 2, a control unit 4, the generator speech-like signals 3, continuous laser radiation 8 and the optical modulator 7.

The proposed device operates as follows.

When detected by the photodetector 1 of the laser radiation in the control unit 4 produces the signal. One signal generator includes a speech-like signal 3, which is coming to an optical modulator 7. The signal from the second output control unit 4 includes a continuous laser radiation 8. The laser beam 8 passing through the optical modulator 7, modulated according to the law of the generator speech-like signals 3 and is directed to forming a transmitting optical system 6. The output form of the transmitting optical system 6, the beam is formed with a predetermined pattern and is radiated onto the reflecting surface of the window glass. The laser light modulated sound (speech) frequency, captured by the receiver laser acoustic locating system, resulting in concealment of the true speech signal (voice data).

Introduction in the device consistently electr what about the modulator and forming an optical transmission system provides a stable, operational protection of premises against unauthorized retrieval of verbal information.

Implementation of the proposed device is straightforward, as all the separate blocks and nodes included in it is well-known, widely described in the technical literature and can be used when implementing the proposed device without additional development.


The protection device voice information from unauthorized removal, comprising a housing, a power supply, the continuous laser radiation, characterized in that it additionally introduced sequentially electrically connected to the photodetector, amplifier, control unit, generator, speech-like signals, an optical modulator, as well as forming the transmitting optical system, while the second output control unit electrically connected to the input of the continuous laser radiation, optical output through which an optical modulator is connected to the input of forming a transmitting optical system, the output of which is the output device and the power unit is connected to the input of the optical modulator of the continuous laser radiation, generator speech-like signals, a control unit, Wuxi


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