RU91786U1 - VIBROPHONIC DEVICE FOR PROTECTING ACOUSTIC (SPEECH) INFORMATION FROM LISTENING THROUGH AN UNAUTHORIZED ACTIVATED TELEPHONE APPARATUS - Google Patents

Abstract

A vibrating device for protecting acoustic (speech) information from listening through an unauthorized activated telephone set containing a power supply unit, a vibro-acoustic noise generator connected with a vibrating device made in the form of an electromagnetic or piezoelectric vibration emitter, characterized in that the vibration emitter is rigidly fixed to the telephone set body.

Description

The proposed technical solution relates to techniques for protecting against leakage of acoustic (speech) information from the premises through a telephone (hereinafter TA) through the following technical channels: due to unauthorized access to TA - "police mode", due to acoustoelectric conversions to TA - microphone effect, by HF method - imposing and through acoustic bookmarks installed in the telephone set.

The use of disconnecting telephone sets from the line when conducting confidential conversations in a room is the most effective method of protecting information, and it is convenient to use the installation of a special protection device in the telephone line that automatically (without operator intervention) disconnects the telephone set from the line when the handset is on-hook.

A device is known for protecting acoustic information through telephone sets (see, Yu.F. Katorin et al., Encyclopedia of Industrial Spying, 2000, Anti-Spyware, St. Petersburg, p. 396), containing two pairs of silicon diodes included in the varistor circuit , shunt capacitors, additional inductors - an additional high-pass filter.

The well-known technical solution provides protection against secret listening through the telephone by suppressing weak information signals that occur in the ringer coil when exposed to acoustic waves using the RF imposition method.

A telephone is known for operating in conditions of external noise (see, patent RU No. 22280, IPC H04M 1/19 A61F 11/00 G01K 11/16 H04R 3/00, publication of 03/10/2002) containing a telephone handset with it installed a microphone capsule and a sound-emitting telephone capsule, wherein a feedback microphone is installed in said handset, the acoustic input of which is located near the acoustic output of said handset, and the acoustic input of the feedback microphone is combined with the acoustic output of the handset.

A device is known for protecting a subscriber SLT from unauthorized acoustic monitoring (see patent RU No. 2350032 IPC H04M 1/68, H04M 1/19, H04K 1/0, publication of 03/20/2009) containing a state monitoring unit connected to a subscriber telephone line a telephone set with two exits: “hung up” and “off-hook”, noise generator, light indication unit, special control signals detection unit in the telephone line, galvanic connection detection unit for unauthorized acoustic control devices installed on the telephone line in front of the telephone state monitoring unit, and the low-pass filter system and low-amplitude filter-limiters placed in front of the protected TA, as well as a signal adder, a telephone line voltage level correction unit, a noise noise generator, consists of a white noise interference generation unit noise "and a high-frequency noise-like signal generation unit, and the display unit further comprises an audio display unit.

The known solution allows the protection of the subscriber telephone from unauthorized acoustic control.

A device for protecting voice information "Bouquet" (see, http://allofsafety.ru/index.php?act=showgood&good_id=3564), containing a processing unit (microprocessor company "Texas Instruments") and a microphone, power supply 220 V / 50 Hz.

The proposed solution is intended to mask the speech of two or more interlocutors by the method of acoustic noise of the room in the negotiations.

Known vibration system WNG - 006 for interfering with devices for intercepting information (see, http://schematic.narod.ru/Radio/spy/ll.htm), containing a block generating interference, randomly modulated and a sensor that converts an electrical signal interference into a vibration signal, the sensor being rigidly mounted on the surface to be protected, covering an area of up to 1.5 m ² , the power supply is 220 V / 50 Hz.

The most effective means of protecting premises intended for confidential negotiations against the taking of information without the needless method through structural elements (windows, walls, pipes, ventilation systems, etc.) are vibration-acoustic noise systems. Protection is provided by the creation of noise vibrations on various building structures, and the system of vibration acoustic noise consists of a generator and actuators: vibration emitters that are mounted on protected structures and acoustic speakers installed in air ducts, tambours, sometimes in the window space, the generator generates "white" noise in the range of sound frequencies that is transmitted to the actuators and, accordingly, to the protected structures, therefore, setting the noise level Igna in octave bands, providing the necessary degree of protection with a minimum of interference acoustic signal in the room, which in this case does not affect the comfort of the negotiations, and in some systems also provides for a voice activation.

A known acoustic “white noise” generator of the LGSh-301 type (see, http://www.suritel.ru/cgi-bin/view.pl?cid=1187156006&ProdId=pr16013) is designed to protect speech information from direct acoustic interception , vibro-acoustic and optical-acoustic channels, using specialized electro-acoustic transducers of low power (see, vibration electromagnetic emitter TRN-2000 (see, http://www.suritel.ru/cgi-bin/view.pl?cid=1187156006&ProdId=pr16009 or a PI-45 vibrating piezoelectric emitter (see, http://www.suritel.ru/cgi-bin/view.pl?cid=1187156006&ProdId=pr16032), designed for excitation of noise vibration (formation of interference) in the walls and floors of the room, in the glazing of windows (doors, office partitions, etc.).

Known vibro-acoustic electromagnetic emitter (universal) SEL SP-55 / V converts the electrical signal generated by the acoustic noise generator into mechanical vibrations of the TA.

A device for protecting analog telephone sets "Korund" is known (see, http://www.suritel.ru/cgi-bin/view.pl?cid=1187156006&ProdId=pr13010), containing a filter (protection from microphone effect), which provides signal attenuation low level from the telephone towards the subscriber line.

A device for protecting 4-wire digital telephone sets MP-1C is known (see, http://www.suritel.ru/cgi-bin/view.pl?cid=1187156006&ProdId=pr14002), comprising a noise generator, non-linear circuits and a node suppression of low-level signals, with the help of which the noise signal is introduced into the subscriber line, attenuation of the low-level signal from the telephone set (SLT) towards the subscriber line and information protection from leakage during active exposure methods, in the call waiting mode.

A known system of vibro-acoustic noise (see. Information Protection, Inside, March - April 2005, No. 2), comprising an acoustic noise generator connected to a vibration transducer, rigidly fixed to the radiation surface, wherein the vibration transducer is implemented as a piezoelectric or electromagnetic vibrator.

For a more complete understanding of the essence of the proposed technical solution, we clarify the terms used to describe it: an adapter is a device, any finished device or part, designed to connect devices that do not have another compatible connection method;

acoustic bookmarks installed in the telephone — designed to eavesdrop on the acoustic (speech) information circulating in the room where the telephone is installed; acoustic radio bookmarks — transmitting information over the air; acoustic network bookmarks - information transfer via 220 V power supply network; acoustic IR bookmarks - transmitting information through an optical channel in the infrared wavelength range; acoustic telephone bookmarks - transmission of information over a telephone line at a high frequency; - acoustic telephone bookmarks of the "telephone ear" type - transmission of information over the telephone line to the "telephone-observer" at a low frequency;

Automatic telephone exchange - automatic telephone exchange: ten-day-step or quasi-electronic, or electronic (digital);

“white” noise - noise with a constant spectral density in the speech frequency range, having the same power distribution for all frequencies;

HF - imposition - this is HF - imposition on wire lines, the basis of which is a tunable RF generator from 70 kHz to 500 kHz, sometimes up to 1 Mg, the output of which is connected to one of the line and ground wires and an RF amplifier with an amplitude detector, which is connected to another wire of the line and ground, when probing the line, the generator frequency is tuned, at some frequency, for example, a telephone or a call connected to the line “resonates” to the probing signal - this will be the probing frequency for this the lines ; the second method of RF imposition is to probe the room through a directional microwave antenna;

the microphone effect is an undesirable phenomenon in which some part of the electric circuit perceives sound vibrations and vibration like a microphone, which is a source of interference, most often occurs when the capacitance changes, especially in high-frequency circuits, where even slight vibrations of poorly fixed parts can significantly affect the transmission parameters main signal.

"police mode" - almost all digital automatic telephone exchanges (DSCs) have declared capabilities for unauthorized (for the subscriber) use of microphones, for example, in the DSC HiCom there are a number of functions that allow you to control the inclusion of microphones and listen to conversations of the subscriber: Service observing - listen to the subscriber's conversation; Answer - the mode of "picking up the handset" on a call signal without the knowledge of the subscriber; Voice calling - voice dialing with a sub-function for listening to the room (remote inclusion of the speakerphone, "baby home" mode);

“pink” noise - noise with a tendency to decrease in spectral density of 3 dB per octave towards high frequencies, instead of the same energy for each frequency, it is similar to “white” noise;

the same energy distribution for each octave (octave bands - frequency ranges in which the upper limit of each band is twice the lower limit) instead of the same energy for each frequency like white noise;

TA - terminal electronic (electro-mechanical) device that performs the following basic functions: dialing to establish outgoing communication; receiving a call from a telephone exchange; transmission of voice information of the interlocutor; various service functions (number memorization, auto redial, call forwarding, etc.); moreover, the telephone has several elements capable of converting acoustic vibrations into electrical vibrations, that is, having a "microphone effect". These include the ringer circuit, telephone and, of course, microphone capsules. When the handset is on, the telephone and microphone capsules are galvanically disconnected from the telephone line, and when special high-sensitivity low-frequency amplifiers are connected to it, interception of information signals resulting from acoustoelectric transformations in the elements of the ring circuit only is possible;

information leakage technical channel (TKUI) - a combination of an intelligence object, technical intelligence equipment (TCP), with which information is obtained about this object, and the physical environment in which the information signal is distributed, in fact, by TKUI they mean a method of obtaining intelligence using TCP information about the object;

noise "speech-like" interference - noise with an envelope of the amplitude spectrum similar to a speech signal, formed by repeatedly superimposing delays of different levels of signals shifted by different times, obtained by multiplying and dividing the frequency components of the hidden speech signal;

a loop is a two-wire line connecting a specific telephone set to a PBX hub.

The technical result of the proposed solution is to increase the effectiveness of protection against listening to acoustic (speech) information through an unauthorized activated telephone.

The technical result is achieved by the fact that in the vibrophonic device for protecting acoustic (speech) information from listening through an unauthorized activated telephone, an electromagnetic or piezoelectric vibration emitter is used, which is connected to a vibro-acoustic noise generator and a power supply, the vibrator being rigidly fixed to the telephone housing. The essence of the technical solution is the protection of acoustic (speech) information due to vibrational noise of the telephone set of any type (analog, digital, facsimile, conference communication systems or IP-telephony) by using: an effective piezoelectric vibrator or electromagnetic vibrator to excite mechanical sound vibrations.

Thus, the sound vibrational vibrations generated by the vibro-acoustic noise generator act on the TA body through a vibro-emitter rigidly fixed on it, which leads to a significant increase in the level of vibration noise in the TA and thereby to a significant deterioration in the conditions for receiving and restoring voice messages by reconnaissance means, providing an excess by noise level above the level of useful speech signal in the channel of information leakage (at the input of the microphone and other acoustoelectric transducers inside the telephone nog apparatus).

Comparison of the proposed solution with the well-known technical solutions shows that it has a new set of essential features, which, together with the known ones, allow to successfully achieve the goal.

The essence of the technical solution is illustrated by the drawing.

The composition of the device:

1. telephone;

2. power supply;

3. a generator of vibro-acoustic noise (white, pink or speech-like interference);

4. switch;

5. vibrator-on device (passive piezoelectric emitter or electromagnetic emitter).

The proposed device operates as follows. A vibro-acoustic noise generator 3 operating in the frequency of masked acoustic signals is built into the power supply unit 2 and connected to a vibration emitter 5, which is rigidly attached to the TA 1 case of any type (analog, digital, fax, conferencing or IP-telephony) from below or in another convenient place on glue or mastic. Thus, vibrating shock signals from the vibro-acoustic noise generator 3 and through the vibrating emitter 5, transmitted to the TA elements, are generated by rapidly changing (unevenly accelerated) vibrations (see, Handbook, Vibrations in Engineering, 1981, volume 6, edited by K.V. Frolov, Moscow , Mechanical Engineering, p. 129).

To generate noise, converted into vibrational shock signals, a passive piezoelectric vibration emitter 5 was used (see, Electronic Journal, Technical Acoustics, 2005, No. 2, pp. 2-9, N.F. Ivina, A.A. Tagiltsev, Analysis of intrinsic oscillations of disk bending piezoelectric transducers with an arbitrary aspect ratio) - shaper of vibration shock signals. As well as to generate interference, converted into vibrational shock signals, an electromagnetic vibration emitter 5 was used (see, Information Protection, Confident, 2003, No. 1, p. 54, S.A. Ubogov, Electromagnetic Vibroacoustic Emitters) - a vibration shock generator .

The device is switched into protection mode manually by switch 4 either from the infrared remote control, before starting negotiations in the room where the SLT is installed, or automatically using the acoustic start device (VOX system) from the adaptive microphone when triggered by voice (not shown in the block diagram )

The technical and economic advantages of the proposed technical solution are enhanced protection of acoustic (voice) information circulating in the room through a telephone of any type (analog, digital, fax, conferencing or IP-telephony), without the use of design modifications of the TA or connections to TA lines, thereby providing comfort for negotiators.

Claims (1)

A vibrating device for protecting acoustic (speech) information from listening through an unauthorized activated telephone set containing a power supply unit, a vibro-acoustic noise generator connected with a vibrating device made in the form of an electromagnetic or piezoelectric vibration emitter, characterized in that the vibration emitter is rigidly fixed to the telephone set body.