Device for masking electromagnetic channels of leakage of speech signals of sound amplification equipment

FIELD: technology for creating artificial interference for masking speech information in industrial network of alternating current.

SUBSTANCE: device (dwg. 1) contains rectifier 2 and, connected serially, noise signal generator 4, noise signal power amplifier 5 and emitter 6, in noise signal amplifier 5, mode B or AB is implemented, between rectifier 2 and power chain of noise signal generator 4 and power amplifier of noise signal, impulse automatic-compensation voltage stabilizer 8 is inserted, at output of which upper frequency filter is mounted, lower cut frequency of which is higher than upper frequency of audible spectrum, but lower than clock frequency of impulse automatic-compensation voltage stabilizer 8.

EFFECT: increased protection of sound amplification equipment from possible electromagnetic leakage of sound information along power chains.

2 dwg

 

The technical field.

The invention relates to the field of artificial noise to disguise voice in industrial AC.

The level of technology.

It is known that the value of economic, political, scientific and technical information exceed the value of material objects. It is therefore extremely urgent protection from unauthorized leaks of information from the state, defense, scientific-technical and business content.

In addition to organizational measures, prescribing the staff rules, to protect the content information apply sophisticated technical means. In particular, to reduce the leakage of information on acoustic and radio channels, a telephone network, a circuit used equipment, etc. applied special schemes masking information signals, reducing the possibility of unauthorized listening. For example, "a Device to counter unauthorized work wired portable devices and informative disturbances in the mains LGS-220" (passport TU-6379-005-31056649-2002, laboratories PCA certificate gasteromycete of the Russian Federation No. 742 dated 07 April 2003); Rotkiewicz Century, Ratkevich P. "Technique measurements at the radio", M: Communications, 1969, str-381.

In operation Horev AA "Methods and means p is the claim electronic devices intercept information", M: the defense Ministry, p.24 presents examples of network bookmarks that are installed in electrical outlets, extension cords, equipment powered by AC, or directly in the power line. Bookmarks are used for retrieval of verbal information. Equipment gain of verbal information should be protected by the channel leak power. Without protective measures amplifying equipment makes a reaction in the network in accordance with the amplified signal, which allows their separation from the network, i.e. the possibility of information leakage. Use power strips and equivalents network in this frequency range is almost not impair the electrical signals. Network filters on the audio frequencies are very bulky and provide a relatively low attenuation (of the order of 5-10 dB) in the range of 100-10000 Hz, which is clearly not enough.

Other information security technical means is the creation of artificial noise generators masking signals, the capacity of which is many times higher than the signal power of information leakage. This significantly reduces the possibility of detecting and receiving information.

The present invention is an improvement in this direction. Conventional structural diagram of the masking device is shown, for example, in the book of Ratkevich Century. Ratkevich P. "Technique from Areni with the radio", M: Communications. 1969 (str-461, RES. It contains the noise generator, the output of which (if required - with amplification) goes to the load, which is usually the radiating antenna. And both the generator and the amplifier, if used, are powered by AC current through the rectifier with a smoothing low pass filter. It is usually carried out on a multi-tier C-L-C elements. In addition, between the generator output and the load enabled network filter to eliminate spurious leakage of information signals from the load in the power network and in the opposite direction.

The described device closest to the claimed most essential features, therefore, selected as a prototype.

Device masking of speech signals, the apparatus comprises a generator of the noise signal, the output of which through an amplifier connected to the antenna, and the generator is connected to the commercial AC power through a low pass LC filter.

The device prototype works as follows. After connecting the rectifier to the commercial AC voltage is supplied to the input of the rectifier, is rectified by the rectifier is supplied to the filter power filter the lower frequencies, it is filtered, then fed to the generator starts to generate a noise signal. This signal, seleniumselenium, also connected to the filter feeding the rectifier goes to the load (antenna), which emits in the ether powerful electromagnetic noise signal, the mask spurious, unwanted radiation amplification equipment, noise which is the claimed device. The device works effectively in cases of power masked equipment from independent power sources. It prevents or substantially reduces the leakage of information through the airwaves.

However, when the power of the masked equipment from General industrial AC leaks not only by air but also by the above General industrial AC.

The mechanism of formation of these channels leak may be as follows.

The change in current consumption especially powerful amplifiers in accordance with the voice information causes a corresponding change in the AC. Naturally, the specified speech information can be extracted from the AC (outside protected areas) for unauthorized eavesdropping.

The device is a prototype, with no masks formed, for example, the above image signals of information leakage through industrial power. Radiated broadcast signals of the noise generator of the mask only e is ectromagnetic channel leakage.

The most obvious two ways to circumvent this:

a) feed protected from equipment leaks only from Autonomous sources of power, i.e. without the use of a shared industrial network. But this is not always possible and quite expensive.

b) enter in the power supply circuit of each of the protected equipment surge suppressing the speech signal that requires significant additional costs (see, for example, p.8, Resv, g and e in the book Kostikova VG, Parfenova EM and Sakhnova VA "Sources of power electronic means. The system engineering and design". Textbook for high schools, 2nd ed., Moscow Hot line - Telecom, 2001). Network filters to suppress speech range must have a large inductance, so they almost make it not more than 10 dB, which is clearly not enough to prevent information leakage. In particular, the network filter contained in the schema of the prototype, in the audio range is almost useless.

Objectives of the invention.

The objective of the invention is to improve the protection of sound equipment from electromagnetic leakage sound information for power circuits from industrial AC.

The solution of the problem.

The problem is solved by the fact that in the known device masking electromagnetic leakage channels audible speech signals is producing apparatus, powered by industrial AC containing a rectifier and connected in series generator noise signal, the power amplifier of the noise signal and the emitter, and the power supply circuit of the oscillator and the amplifier is connected to the rectifier, made significant changes, namely, the amplifier noise mode is applied In or AV, between the rectifier and the power supply circuit of the generator and amplifier noise introduced pulse autocompensation the voltage regulator at the output of the stabilizer has a high-pass filter, cutoff frequency above the upper frequency of the audible spectrum, but lower clock frequency switching regulator.

To increase the effectiveness of the masking pulse autocompensation stabilizer is better not to escape.

Inventive problem - introduction to industrial AC powerful noise current component - resolved two are inextricably related technical findings: the creation of a powerful current source, the shape is close to the generated noise signal, and supply a simple way of introducing it into industrial AC.

The first solution - applying mode In the amplifier. In this mode, the instantaneous amplitude passing through the current amplifier is almost directly proportional to the instantaneous amplitude of Wuxi is Ivanovo they signal. Thus, in our case, when the gain of the noise signal on the power supply circuit of the amplifier will be current, identical to the amplified noise signal. Of course, in AV mode, this dependence is passing current from the amplified signal is mitigated somewhat. Incidentally, While it is absent at all.

The second solution is the connection of the power amplifier of the noise signal to the commercial AC power through pulse autocompensation the voltage regulator. As is known, the voltage regulator consumes from the industrial network current, instantaneous value of which is proportional to the instantaneous values of current to its load. In our case (the gain of the noise signal) when the power of the noise signal through pulse autocompensation the voltage regulator last will consume commercial power supply current corresponding to the current form of the amplified noise signal.

To avoid this circuit the current through the filter stabilizer applied a high-pass filter, the lower cutoff frequency above the upper frequency of the audible spectrum, but lower clock frequency switching regulator.

Thus, the proposed changes to the device masking of speech signals has allowed a very simple means to enter into the network of industrial AC powerful noise of the howling signal, frequency which is close to the composition of the generated noise signal. The latter is known to mask the signals of all of the audible spectrum.

Disclosure of the invention.

The invention is illustrated by the two figures, which show examples of block diagrams of the device masking of the speech signal (figure 1) and pulse autocompensating stabilizer voltage noise generator and amplifier noise (figure 2).

In the figures, the following notation:

1 - industrial AC current 2 - voltage rectifier network 3 - lowpass filter, 4 - noise signal generator, 5 - amp noise signal, 6 - emitter noise signal (e.g., antenna), 7 - sound amplifying equipment, 8 - pulse autocompensation voltage regulator power supply, 9 - key cascade, 10 - pulse transformer, 11 - output rectifier, 12 a high - pass filter, 13 - source reference voltage, 14 - comparator 15 - pulse-width modulator 16 - power PWM signal, 17 - master oscillator sawtooth waveform,

Device masking (figure 1) works as follows. When activated, the voltage industrial network 1 AC power is supplied to the rectifier 2 which rectifies the received rectified voltage is supplied to the pulse avtok mpensation stabilizer 8. Stable block 8 voltage powers the generator 4 of the noise signal and the amplifier 5 to the power of the noise signal. The generator 4 is excited, starts generating a noise signal which after amplification by the amplifier 5 emits emitter 6. Radiated noise signal (electromagnetic field generated in the air) has a capacity many times greater than the power possible electromagnetic radiation masked apparatus 7, which is powered from the network 1 alternating current through the rectifier 2 and the low pass filter 3.

As for the masking of signals in the circuit, it is due to the special mode power amplifier of the noise signal and the injection pulse autocompensating voltage between the rectifier and the power amplifier. Next, it is explained in more detail.

Pulse autocompensation stabilizer 8 voltage works as follows. Voltage industrial network 1 AC network through the rectifier 2 is supplied to the input key cascade 9, the second control input of which receives the opening pulses fed from the output of the amplifier 16 PWM signal. Upon receipt of each trigger pulse key cascade 9 is unlocked and through him, and the primary winding of the pulse transformer 10 (included consistently in key cascade 9) forms the t of the current pulse, creating the secondary winding of the transformer 10 pulse voltage with a frequency of master oscillator 17, which continuously generates a sawtooth pulses with a frequency of 20-30 kHz. The duration of the current pulse and voltage pulse transformer 10 is automatically adjusted by the feedback circuit. This feedback circuit eliminates pulse output voltage output from the pulse transformer 10 and compares it computadora 14 with a given constant reference voltage, a separate low-power rectifier or the battery 13. The comparator 14 produces at its output a periodic sequence of sawtooth voltage, slew rate of each of which is proportional to the difference between the amplitude of each pulse of the pulse transformer 10 and the reference voltage 13. This sequence of sawtooth pulses fed to the input of pulse width modulator 15 (PWM modulator that converts this sequence of sawtooth pulses in corresponding sequence of rectangular pulses whose width is proportional to the instantaneous amplitude of the input current. The received PWM signal through the amplifier 16 PWM signal at the control input key cascade 9, Opera it for the duration of each pulse. The output pulse on what the custody of the key cascade 9 through pulse transformer 10 is supplied to the output rectifier 11 and the filter 12 of the upper frequencies, the output which is the output of the switching regulator 8, a power supply 5 power generator 4 of the noise signal.

Because you selected the mode (or AB) operation of the power amplifier 5 of the noise signal, the instantaneous value of its current proportional to the amplified noise signal. I.e. opening and locking key cascade 9 connected directly to the rectifier 2 industrial AC will also repeat the instantaneous value of the noise signal. Note that the high-pass filter has a lower cutoff frequency above the upper frequency of the audible spectrum in order not to distort the shape of the masking power into AC power, but lower clock frequency switching regulator to smooth out the pulsations of the rectified voltage.

In other words, in the industrial network 1 AC current flows, the spectral form which repeats the spectral shape of the generated noise signal.

Naturally, the flow of current such forms in industrial network 1 AC has the same masking effect on the signals of possible leakage of information, what produce the signals radiated by the antenna for electromagnetic signals leak information through the airwaves.

Thus, the application of class b or AB amplifier power noise GE is erator and power from industrial AC current through pulse autocompensation stabilizer with a high-pass filter on the output is allowed to enter the powerful masking signal in industrial AC current is extremely simple and cheap way.

Industrial applicability.

The claimed device is easily realizable known and long-established industry scheme and constructive means. Rectifiers, filters, generators and amplifiers are traditionally. Pulse autocompensation the stabilizer may be performed, for example, in accordance with the recommendations of the guidelines "power radio", Saint-Petersburg state Academy of aerospace instrumentation, St. Petersburg, 1995, p.27-32.

The applicant has fabricated and tested the claimed device. The test results showed that the protection of the equipment against unauthorized leakage of sound information along the food chain is increased by 2-3 times, depending on the power of the speech signal, amplified masked reinforcement systems.

The cost of changes and extra money was incomparably lower in comparison with the known solutions to this problem, and the efficiency is much higher.

Thus, in our opinion, the claimed device meet all the criteria of the invention - it is new, not obvious and industrially applicable.

Device masking electromagnetic leakage channels of speech signals, sound equipment, powered by prom the industrial AC, containing a rectifier and connected in series generator noise signal, the power amplifier of the noise signal and the emitter, characterized in that the amplifier noise signal applied to the mode or AV, between the rectifier and the power supply circuit of the generator of the noise signal and amplifier noise signal introduced pulse autocompensation the voltage regulator, the output of which has a high-pass filter, the lower cutoff frequency above the upper frequency of the audible spectrum, but lower clock frequency pulse autocompensating voltage regulator.



 

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