The protection device voice information from unauthorized removal

 

The invention relates to the field of optics, in particular to devices for the protection of verbal information from closed spaces from eavesdropping and recording using laser acoustic location systems. The technical result is the strengthening of the protection of information from unauthorized removal and weakening of the amplitude of the reflected laser radiation with simultaneous creation of false acoustic signals. The technical result is achieved in that the device comprises a sensor of the laser acoustic location systems (RTLS) are sequentially electrically connected through the pad unit is connected to the input of block forming acoustic signals, the first output unit forming acoustic signals connected to the window glass, and the second output unit forming acoustic signals connected to the piezoelectric element, and the power supply output is connected to the input of the block forming acoustic signals and the input of the starting block, and absorbing - reflecting film is mechanically fixed to the window glass. 2 Il.

The device relates to the field of optics, in particular to devices for the protection of verbal information from closed areas from about the formation, using laser producing 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, for example, “Overview of active technical protection of information” M., 1997, No. 6, - S. 61-63).

The disadvantage of such devices 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 (especially their eyes), located in the protected area.

Also known devices intended to protect speech information in the premises indoors, on its inner reflecting surface or directly on the window glass served acoustic oscillations with amplitude, clearly exceeds the amplitude of the vibrations of the human voice (see, for example, RU 27442 U1, 7 H 04 To 3/00. The device vibroacoustic noise premises / Romanuk C. M., Fokin, E. M. CJSC "ANNA". - 2002109695/20; Appl. 16.04.2002).

The closest technical solution chosen as a prototype, is the device described in patent RU No. 2130697, C1, 6 H 04 M 1/68 way to protect the voice data from eavesdropping and recording / Ratnikov, A. Y., George D. N., Kapralov, N. - 98103645/09; Appl. 24.02.98.).

In Fig.1 shows a functional diagram of the device of the prototype, where indicated:

1 - window glass;

2 - body window glass.

3 - block the formation of acoustic signals;

4 - power source.

In addition, in Fig.1 mark:

I is the incident laser listening device;

II - laser radiation reflected from the surface of the window glass;

III - acoustic vibrations of the window glass.

The device prototype has the following functional relation.

In the case of window glass 2 is rigidly fixed to the window glass 1. Block the formation of acoustic signals 3 acoustically connected to the window glass 1.

The device prototype works as follows.

When working for the protection of the speech information includes block formiranje, reflected from the surface of the window glass II is modulated at an audio frequency of persons in the protected area. Since the amplitude of these acoustic waves is certainly higher than the acoustic oscillations of the protected information, the input of the receiver laser acoustic location systems (RTLS) will be perceived false signals generated by the processing unit of acoustic oscillations 3.

The drawback of the prototype is that the generated acoustic obstacle quite easily filtered out, because the decomposition of the spectrum not only on frequency but also the amplitude, which makes it possible to select only the modulating oscillations inherent in the human voice. An attempt to write in block formation of acoustic oscillations of the votes of the persons present at the meeting, in accordance with the amplitude and frequency characteristics of the persons involved, only adds complexity to the equipment.

To address these shortcomings in the device containing the window glass with the body, block the formation of acoustic signals and the power supply, put the sensor of the laser acoustic location systems (RTLS), piezoelectric element, the actuator block and absorb the Cesky fixed sensor laser acoustic location systems (RTLS) and absorbing-reflecting film, which is mechanically connected with the piezoelectric element. The sensor output of the laser acoustic location systems (RTLS) are sequentially electrically connected through the pad unit is connected to the input of block formation of acoustic signals. The first output unit forming acoustic signals connected to the window glass, and the second output unit forming acoustic signals connected to the piezoelectric element made in the form of a tape attached to the glass.

Introduction in a device of the above mentioned elements will allow to solve the problem of rapid and enhanced protection mode information representing the state (military) a secret from unauthorised removal laser acoustic locating systems by automatically "blanking" (weakening) of the amplitude (information) of the laser radiation and the simultaneous creation of false acoustic (speech-like) signals.

In Fig.2 shows a functional diagram of the proposed device, where we have introduced the following notation:

1 - window glass;

2 - body window glass;

3 - block the formation of acoustic signals;

4 - power source;

5 - starting block;

6 - sensor laser acoustic location systems (RTLS);

7 the communications performance communications.

On the window glass 1, is rigidly fixed in the housing 2, the mechanical sensor is fixed to the operation of the laser acoustic locating system 6 and absorbing-reflecting film 8, which is mechanically connected to the piezoelectric element 7. The sensor output of the laser acoustic location systems (RTLS) 6 sequentially electrically via the actuator unit 5 is connected to the input of the block forming acoustic signals 3. The first output unit forming acoustic signals 3 connected to the window glass 1. The second output unit forming acoustic signal 3 is connected to the piezoelectric element 7. The output of the power source 4 is connected to the input of the block forming acoustic signals 3 and the input pad unit 5.

Absorbing-reflecting film made in the form of a hemisphere so that the radius R is related to the size of the irradiating surface and the ratio R=(0,001-0,005)a, enables the distribution of the reflected signal in a wide (close to 180) coal.

Comparative analysis of the prototype shows that in the known device further introduced the starting block, sensor, sensor, laser acoustic location systems (RTLS) and absorbing-reflecting film, United in indicated in Fig.2 osogo retrieval of verbal information by significant attenuation information of the laser signal due to multiple reflections of the incident laser radiation in a wide (close to 180) angle from the window glass and absorbing-reflecting film, the absorption of radiation by the film, as well as through the creation of disturbances of acoustic signals.

Thus, the inventive security device voice information from unauthorized removal meets the criteria of the invention of “novelty.”

The comparison of the proposed solutions not only prototype, but also with other technical solutions in this field of technology has allowed to reveal in them the features distinguishing the claimed solution to the prototype that allows to conclude that the criterion of “inventive step”.

The proposed device operates as follows.

The laser acoustic location systems (RTLS) for listening to voice information from the premises of the sensor triggers the operation of the laser acoustic locating system 6, a signal which is fed to the input pad unit 5. The output signal from the starting unit 5 is fed to a forming unit of acoustic signals 3 generating interfering speech-like signals on the window glass 1, fixed in the housing 2, and the piezoelectric element 7, acoustically associated with absorbing-reflecting film 8. As a result of this laser radiation reflected from the in Addition, due to at least double reflection of laser radiation from the surfaces of the window glass 1 and absorbing-reflecting film 8, as well as due to the absorption of radiation absorbing-reflecting film 8, there is a significant weakening of the laser radiation received at the receiver input laser acoustic location systems (RTLS). Given that the absorbing-reflecting film made in the form of positive hemisphere of radius R associated with the size of the exposed surface of the absorbing-reflecting film 8 a correlation of R=(0,001-0,005)a, where a is the size of the exposed surface of the absorbing-reflecting film, leads to scattering of the reflected laser radiation in a wide (close to 180) coal.

Power supply 4 provides the functionality of all blocks included in the proposed device.

The proposed device will significantly improve the efficiency and effectiveness of the protection of the premises against unauthorized retrieval of verbal information by significant attenuation information of the laser signal due to multiple reflections of the incident laser radiation in a wide (close to 180) angle from the window glass and absorbing-reflecting Peyia time experimental work, confirming the correctness of the chosen solution.

Implementation of the proposed device is not in doubt, 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.

Claims

1. The protection device voice information from unauthorized removal, containing the window glass, building window glass, power supply and block the formation of acoustic signals, characterized in that it additionally introduced absorbing-reflecting film, the sensor of the laser acoustic location systems (RTLS), sensor and actuator unit, and the sensor output of the laser acoustic location systems (RTLS) are sequentially electrically connected through the pad unit is connected to the input of block forming acoustic signals, the first output unit forming acoustic signals connected to the window glass, and the second output unit forming acoustic signals connected to the piezoelectric element, when the power supply output is connected to the input of the block forming acoustic signals and input pusp.1, characterized in that the sensor of the laser acoustic location systems (RTLS) is mechanically fixed to the window glass.

3. Device according to any one of paragraphs.1 and 2, characterized in that the piezoelectric element is made in the form of a tape, mechanically connected with absorbing-reflecting film.

4. Device according to any one of paragraphs.1-3, characterized in that the absorbing-reflecting film made in the form of positive hemisphere of radius R associated with the size of the exposed surface of the absorbing-reflecting film of a ratio R=(0,001-0,005)a, where a is the size of the exposed surface of the absorbing-uragawa film.

 

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FIELD: measurement technology; pulse stream generators.

SUBSTANCE: proposed Poisson pulse stream generator has k + 1 memory devices, comparison unit, k digital-to-analog converters, control circuit, register, counter, selector, k bell-shaped pulse generators, adder, voltage-to-current converter, and clock generator.

EFFECT: enlarged generation range of pulses adequate to ionization chamber signals.

1 cl, 2 dwg

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