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Vibroacoustic noise generator. RU patent 2253181.

IPC classes for russian patent Vibroacoustic noise generator. RU patent 2253181. (RU 2253181):

H03B29 - Generation of noise currents and voltages

G10K3 - Rattles or like noise-producing devices

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FIELD: radio engineering.

SUBSTANCE: proposed vibroacoustic noise generator that can be used in information protection systems to produce noise signal for blocking voice information interception from locations designed for secret negotiations has microphone, microphone amplifier, log amplifier, splitter, n band filters, n scramblers, n random pulse generators, adder, power amplifier, and radiator. Effectiveness of noise signal produced by generator is independent of generator location, acoustic properties of room, vibration properties of guarding structures and engineering services, and type of radiators connected to generator.

EFFECT: enhanced efficiency of noise signal.

1 cl, 1 dwg

The invention relates to electrical engineering and can be used to create acoustic and vibration noise signals in systems vibro-acoustic masking, designed to protect sensitive voice data in a dedicated (protected) areas.

Known acoustic generators (vibro-acoustic) noise containing shapers of the noise signal, amplifiers and acoustic (vibration) emitters [1, 2, 3].

These generators can generate one of the following types of interference:

- "white" noise (noise with a constant spectral density in the speech frequency range);

- "pink" noise (noise with the declining trend of the spectral density of 3 dB per octave at high frequencies);

- the noise from the declining trend of the spectral density of 6 dB per octave at high frequencies;

noise "speech-like" noise (noise with an envelope amplitude spectrum that is similar to the speech signal).

Of speech-like noise most effectively have speech-like noise generated from fragments of hidden speech signal with their multiple overlapping with different levels [4, 5].

The closest in technical essence and the achieved positive effect of the claimed invention is a generator of acoustic speech-like noise, described in [3]. The generator of acoustic speech-like noise contains connected in series microphone, microphone amplifier, block processing signal, the power amplifier and the emitter.

In this generator implemented method of generating a speech-like noise by multiplying and dividing the frequency components concealed speech signal and multiple overlays accept paratragedy acoustic signals (reverb).

The microphone receives the acoustic speech fluctuations arising from negotiating, and converts them into electrical signals that are amplified by the microphone amplifier and the connecting cable are fed into the processing unit of the signal.

In the block processing of these signals by multiplying and dividing the frequency components converted into noise “speech-like”, are amplified and emitted through the speakers. Radiated noise “speech-like acoustic signals reflected from the enclosing structures of buildings (walls, Windows, ceiling, floor, furniture and interior, and some time after radiation (delay time) are accepted by the microphone and as well as hide the speech signals are processed and emitted through the speakers. This process is repeated several times.

Thus, the device radiates “speech-like” interference resulting from multiple overlay shifted by different time delays of the multi-level signal obtained by multiplying and dividing the frequency components concealed speech signal.

The disadvantage of this device is a significant dependence of the efficiency of the generated interference from acoustic parameters of the room, placement of speakers and the quality of the system setup. In addition, this method of forming the interference cannot be used in systems vibro-acoustic masking when connected to the generator vibroisolating, due to the impossibility of obtaining the reverb effect.

The required technical result of the invention consists in ensuring the effectiveness of interfering signal irrespective of the place of installation of the generator, the acoustic properties of the room, the vibrational properties of building envelopes and engineering services, as well as type connected to the generator radiators.

The required technical result is achieved that the device consisting of series-connected microphone, microphone amplifier, array signal processing, amplifier and loudspeakers, additionally introduced a logarithmic amplifier, splitter, n bandpass filters, n scrambler, n generators of random pulses and the adder, the output of the microphone connected to the microphone input of the amplifier, the output of which is connected to the input of the logarithmic amplifier, the output of which is connected to the input of the splitter whose outputs are connected to inputs of bandpass filters whose outputs are connected to the main inputs of the analog scrambler to the control inputs of which are connected the outputs of the generators of the random pulses the outputs of the analog scrambler connected to inputs of the adder, the output of which is connected to a power amplifier, the output of which is connected to the emitters.

The proposed solution differs from the prototype to the presence of new units: logarithmic amplifier, splitter, n bandpass filters, n scrambler, n generators of random pulses, adder and their relationships with other elements of the scheme. These differences allow to draw a conclusion on the conformity of the proposed solutions to the criterion “novelty”.

The desired result is achieved of all the newly introduced set of essential features that are known in the patent and scientific literature is not detected at the date of filing. Therefore, the technical solution meets the “inventive step”.

The drawing shows a block diagram of the generator vibroacoustic noise.

Generator vibroacoustic noise contains a microphone 1, microphone amplifier 2, a logarithmic amplifier 3, y 4, n band-pass filters 5, n scrambler 6, n of generators of the random pulses 7, the adder 8, the power amplifier 9 and the emitters 10.

Thus the output of the microphone 1 is connected to the input of the microphone amplifier 2, the output of which is connected to the input of logarithmic amplifier 3, the output of which is connected to the input of the coupler 4, the outputs of which are connected with the inputs of the bandpass filter 5, the outputs of which are connected with the main inputs analog scrambler 6, to the control inputs of which are connected the outputs of the generators of the random pulses 7, the outputs of the analog scrambler 6 is connected to the inputs of the adder 8, the output of which is connected to the power amplifier 9, the output of which is connected to the emitters 10.

Generator vibroacoustic noise works as follows.

Hidden acoustic signal converted by the microphone 1 in electrical and served on a microphone amplifier 2. The amplified signal from the microphone amplifier 2 is fed to a logarithmic amplifier 3, and then through the splitter 4 - n band-pass filters 5. With the output of each bandpass filter 5 signal into a corresponding analog scrambler 6, which produces an inversion of the signal spectrum. The operation of the analog scrambler 6 is a generator of random pulses 7, the frequency point of each inversion scrambler 6 will change randomly in the range of frequencies from f n1-f n2 at time intervals t u . Further, the analog scrambler 6 are fed to the adder 8. The adder 8 n noise signals are summed and fed to the power amplifier 9 which amplifies them to the specified level. Next, a noise signal is supplied to the emitters 10 (speakers or vibroisolating).

Due to a change in the point of inversion randomly, you cannot select position signal from interfering.

Thus, the proposed generator vibroacoustic noise in comparison with the prototype allows you to create speech-like vibroacoustic noise interference regardless of the location of the generator and the characteristics of the room.

Sources taken into account

1. Andrianov, V.I., Borodin V.A., Sokolov A.V. “Spy stuff” and device for protection of information. The Fallow Deer, St. Petersburg., 1996. - P.146.

2. Digital noise generators. Radio, 1990, No. 8. - S.

3. The speaker protection “Echo”. The instruction manual. - M.: NPP “Insano”, 1999. - 4 S.

4. Bortnikov A.N., Gubin S., Komarov I.V., Mayorov VI the results of the experimental evaluation of the effectiveness of protection of verbal information from leakage through technical channels using different types of interference.// Information and security. - Voronezh, 1999. - Issue # 4. - P.4-8.

5. Horev A.A., Makarov J.K. TO assess the effectiveness of protection acoustic (speech) information// Special equipment. - M.: 2000. No. 5 - P.46-56.

Generator vibroacoustic noise containing connected in series microphone, microphone amplifier, power amplifier and emitter, characterized in that it additionally introduced a logarithmic amplifier, splitter, n bandpass filters, n scrambler, n generators of random pulses and the adder, the output of the microphone amplifier is connected to the input of the logarithmic amplifier, the output of which is connected to the input of the splitter whose outputs are connected to inputs of bandpass filters whose outputs are connected to the main inputs of the analog scrambler to the control inputs of which are connected the outputs of the generators of the random pulses, the outputs of the analog scrambler connected to the inputs of the adder, the output of which is connected with the power amplifier, the output of which is connected to the emitters.