Method for protecting speech information along vibro-acoustic channel

FIELD: radio engineering, namely, equipment for generating artificial interference, possible use for protecting information from leaking along vibro-acoustic channel from a room.

SUBSTANCE: in accordance to method for protecting speech information along vibro-acoustic channel, interference is generated for masking speech signal, while interference is formed as M-series of pulses with following transformation, while transformation of M-series of pulses is performed in form of generation of vibration impact signals, by which speech signal is multiplicatively masked, while M-series of pulses is generated from period to period in accordance to random rule.

EFFECT: increased efficiency of technical means for information protection, decreased acoustic radiations, interfering with negotiations, radiations, affecting operation of nearby radio-electronic means, and also disclosing a structure of noise interference, decreasing probability of it being filtered.

2 dwg

 

The invention relates to the field of radio, namely the technique of creating an artificial interference, and can be used to protect information from leaking through vibro-acoustic channel from the premises.

There are ways to protect information from unauthorized removal by vibroacoustic channel (see, for example, Choriev A.A. Ways and means of information protection. - M.: the Ministry of defense, 2000, p.62, p.80-83; C1 2130697 EN 6 H 04 M 1/68. The way to protect the voice data from eavesdropping and recording. /Ratnikov, A., George D., Kapralov GN. No. 98103645/09; Appl. 24.02.98), which are aimed at protecting information in the selected areas, by the effect of noise interference on the elements of the building structure on the basis of which collected the premises.

The known methods have the following disadvantages. When data protection noise / interference effects occur, hindering the negotiations in a dedicated room. In addition, there is radiation in the environment, which affect the operation of nearby electronic equipment, and also reveals the structure of noise interference that may allow it to filter (see, for example, Ubogu S.A. vibro-acoustic radiators of electromagnetic type. - M.: Protection of information. A fiduciary, No. 1, 2003, p.54).

The closest in technical essence of the proposed method is C1 2130697 EN 6 H 04 M 1/68 - with whom persons protection acoustic information from eavesdropping and recording, including the definition amplitudemodulated characteristics of votes of the persons participating in the exchange of information, and the generation of acoustic noise in a certain amplitudemodulated characteristics. Prototype method involves the application analyzer acoustic environment in a dedicated room, and shaper adapted to this environment noise amplifier and emitter.

This method has the following disadvantages. Direct suppression of noise speech signals in terms of the exercise of intelligence is not effective and requires current "signal/noise" in octave bands up to 20 dB. This leads to the fact that the negotiations in the room become daunting.

An important difference of the proposed method from the prototype method is the lack of need for special analysis amplitudemodulated characteristics of votes of the persons participating in the exchange of information, to select interference to ensure the desired effect protection. In addition, for technical solutions implementation of the proposed method are required lesoustroistva that do not allow for the full implementation of the type C1 2130697 EN 6 H 04 M 1/68 (see, for example, Ubogu S.A. vibro-acoustic radiators of electromagnetic type. - M.: Protection of information. A fiduciary, No. 1, 2003, article is .54).

An important difference of the proposed method from the method type C1 2130697 EN 6 H 04 M 1/68 is the use of piezocryst not for the formation of interference in the form of a noise signal from a set of harmonics, and for the formation of interference that can be converted into vibration shock signals.

The invention solves the problem of improving the effectiveness of technical means of information protection and reduction of interfering radiation on people leading the negotiations in a dedicated room, and radiation affecting the operation of other nearby electronic and revealing the structure of noise interference, thereby reducing the possibility of filtering.

The proposed method of information protection uses a new approach in the implementation of artificial interference vibro-acoustic channel. This approach is based on the multiplicative sum of the masked speech and interfering signals. For this disturbance to form into the form of a M-sequence of pulses with subsequent transformation, and M is a sequence of pulses is converted into vibration shock signals, the effect of which leads to the decrease of the amplitude of the speech signal at the receiver input acoustic intelligence that accompanies the efficiency of technical protection of information from qualitative and quantitative reducing their disadvantages. In addition, an M-sequence pulse is law period from period form randomly, thereby preserving not only the required statistical characteristics of the interference, but also minimizing the possibility of filtering in the conduct of intelligence in ideal conditions (when the scout priori known not only contributing factors, but the law of formation of the masked voice signal). In other words, to account for the manifestations of the multiplicative noise generated by the proposed method, it is necessary to consider factors not only stationary, dynamic, and determined random functions that in the modern development of technological implementations reconnaissance will require in the real conditions of the time, exceeding the importance of protected information. The proposed obstacle directly, not filtered, especially when the choice of level at which due to the multiplicative level masked speech signal at the receiver input acoustic intelligence close to zero.

The invention is illustrated graphics, where:

figure 1 - block diagram of the method;

figure 2 - implementation of forming a vibrating drum signals.

On the block diagram figure 1 shows:

1 - generator M-sequence of pulses;

2 - power (matching unit);

3 - shaper vibration shock signals;

4 - the element of the building structure.

Has been verified the feasibility of the proposed method of protection of verbal information on vibro-acoustic channel. This was developed is described device whose output signal formed by the shaper (3) vibration shock signals, mounted on the element of the building structure. Amplifier (2) was used for matching the output parameters of the generator (1) M is a sequence of pulses with the input parameters of the shaper (3) vibration shock signals.

The generated vibration shock signal element of the building structure was reported rapidly changing (neravnomernii) vibratoire ("Vibrations in engineering. The Handbook. Volume 6 / edited by Kvirila. - M.: Mashinostroenie, 1981, str" - "large velocity").

According to theory of oscillations and vibrations expression for the dynamic characteristics provodenciales element (building construction) - result signal (at the receiver input acoustic intelligence) has the form:

F(x, x', t)=Fin(x, t)-Fy(x)-Fd(x', t)

where Fin(x, t) - acting (formed of masker is Amy voice shock and vibration) signal, informing the deflection element of the building structure on the value of x at time t; Fy(x) - linear elastic component of the signal (which is formed by the influence of the element of the building structure), depending on the values of the displacement (deformation) x (vibrational effects Fy(x)=Fy(x, t), i.e. the observed time dependence), and

Fy(x, t)=c·x(t)

here is the rigidity of the element; Fd(x', t) is dissipative (non-elastic) component of the signal (which is formed by the influence of the element of the building structure), depending on the availability of impact vibration shock signals, determined by nonlinear vibrational energy redistribution system (including acting signals and the object of their application element of the building structure) in General.

The nonlinearity was formed in the form of a quadratic dependence of the dissipative component of the signal from the rate of change of coordinates x (deformation element of the building structure). The expression describing this dependence is as follows:

Fd(x', t)=b2·x'2(t)·sgn x'(t).

Here b2is a certain constant.

Such dissipative component of the signal formed by the impact of multiple vibration shock signals converted from short is Rostov pulses M-sequence.

In addition, to compare the effectiveness of the proposed method of protection of verbal information on vibro-acoustic channel in relation to the efficiency of the method type C1 2130697 EN 6 H 04 M 1/68 dissipative component of a signal formed by interference effects in the form of a noise signal from a set of harmonics.

The dissipative component of the signal formed in the form of its linear dependence on the rate of change of coordinates x (deformation element of the building structure). The expression describing this dependence is as follows:

Fd(x', t)=b1·x'(t).

Here b1is a certain constant.

During the formation of dissipative component of the signal in terms of its linear dependence on strain rate element of the building structure was not observed manifestation of the multiplicative form of interference. Was observed only famous for its traditional properties of additivity (additive addition masked speech and interfering signals).

When checking the feasibility of the proposed method of protection of verbal information on vibro-acoustic channel and the comparison of its efficiency with the efficiency of this method was formed:

the masked voice signal sound pressure 80 dB;

interfering signals, the value of the effective voltage levels which did not exceed 5 In h is the generator output.

Under the conditions of the same experiment to compare the effectiveness of methods multiplicatively generated interference was possible to reduce the amplitude of noise signal (at least 10 dB) through (including) decrease (due to the multiplicative form of the interference level of the masked voice signal.

For the formation of interference that can be converted into vibration shock signals applied lesoustroistvo - shaper vibration shock signals. Figure 2 shows the implementation of the formation of the vibrating drum signals.

Figure 2 indicated:

2 - power M-sequence of pulses;

5 - piezoplates (metallic surface) of the shaper vibration shock signals;

6 - metal substrate shaper vibration shock signals;

7 - holding fixture of the piezo-shaper vibration shock signals;

4 - the element of the building structure.

As lesoustroistva used domestic system - similar to type PO-3, representing a piezoelectric transducer constructed on the basis of a piezoelectric material. The piezoelectric transducer was used as a shaper vibration shock signals. It consists of a disk piezoplates - 5, polarized in thickness and tightly sacral is authorized on a metal substrate 6. The outer surface of piezoplates is metallized. The substrate and the metallized surface of piezoplates electrodes are connected to the output of the amplifier M-pulse - 2. On the surface of piezoplates there is no normal component of the electric induction. The outer surface of the piezoelectric transducer is free from mechanical stresses. The possibility of such piezoelectric tranducers described in some sources (see, for example, Ivin NF, tigilau A.A. the Analysis of free vibrations of the disk Flexural piezoelectric tranducers with arbitrary aspect ratio. - M.: Electronic journal. Technical acoustics, No. 2, 2005, p.2-9).

By means of the mounting device 7, which is a metal construction, shaper vibration shock signals rigidly fastened to the surface of an element of building construction - 4. The piezo-shaper vibration shock signals were fixed on the path to fixing mechanical device node.

The use of piezoelectric transducer as an integral part of the shaper vibration shock signals for the implementation of the proposed method due to the possibility of piezocryst linearly convert the electrical signal forming the electric field for PiezoStar Ista, in mechanical. This property is characteristic, in particular, to a reverse piezoelectric effect (see, for example, Piezoceramic transducers / edited by Pugachev SR - Leningrad: Sudostroenie, 1984, 256 C.). This effect is described by the expression

x=dE,

where E is the electric field; d - piezomodulus (some constant).

That is, using the described property of the linear transformation inverse piezoelectric effect, was formed shock vibration signals, which are transmitted to the element of the building structure, repeating in time the fronts of the signals generated M-sequence of impulses.

Thus, we used the range (see, for example, Ubogu S.A. vibro-acoustic radiators of electromagnetic type. - M.: Protection of information. A fiduciary, No. 1, 2003, p.54) effective frequency (above units kHz - given the fact that the period M-sequence of pulses is comparable with the correlation interval of the speech is more than 10 MS to avoid the implementation of algorithms for the optimal filtering masked speech signals, and the number of pulses in its period of more than 300, from the properties of filterability interference with digital noise generation and implementation principle of recurrent formulas in the formation of the M-pulse sequence, see, e.g., Horowitz P., hill U. Art circuitry, so 2. - M. Mir, 1986, p.97-100) lesoustroistva for the formation of shock vibration signals.

When checking the feasibility of the proposed method of protection of verbal information on vibroacoustic channel allocated to the following main aspects of its implementation:

1. Described by use of the shaper vibration shock signals were used multiplicatively interference due to the formation of dissipative component of the signal with the nonlinear characteristic is its quadratic dependence on strain rate element of the building structure.

2. In addition, an obstacle in the form M-pulse vibration shock signals (with a uniform range of tens of kHz - see, for example, Horowitz P., hill U. Art circuitry, so 2. - M.: Mir, 1986, p.98-99) as described was applied to the element of the building structure as the masked her speech signal with minimal distortion. The element of the building structure acted as a mechanical resonance-antiresonance filter (that is, they have formed a real spectrum of the resulting signal F(x, x', t), dependent masked and interfering signals based on multiplicative).

3. Implementation of the described method, there is no doubt, as it is implemented on elements and nodes produced by the industry of the country.

. The way to protect the voice data via vibro-acoustic channel, namely, that form an obstacle to the masking of the speech signal and noise shaping in the form of an M-sequence of pulses with subsequent conversion, wherein the conversion of the M-sequence of pulses is carried out in the form of formation vibration shock signals that multiplicative masking the speech signal.

2. The method according to claim 1, characterized in that the M-pulse sequence is formed from period to period randomly.



 

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