RU2691743C1 - Autonomous device for physical break of audio path circuit - Google Patents

Abstract

FIELD: telecommunication systems.SUBSTANCE: invention relates to the field of telecommunication systems and can be used to create devices with protection against information transmitted through the audio path from unauthorized access. Autonomous device for physical break of the audio path circuit comprises a button, a control module, a sound path circuit break module and a safe mode activation indicator, the input of which is connected to the output of the circuit breaker of the audio circuit, group of inputs of which is connected to group of outputs of control module, input of which is connected to button output, group of outputs of circuit break module of audio circuit is connected to group of outputs of device, wherein the control module comprises a Schmitt trigger and a D-trigger whose output is connected to the output of the control module, the input of which is connected to the input of a Schmitt trigger, the output of which is connected to the input of the D-trigger, wherein the audio path circuit break module comprises a relay unit.EFFECT: preventing the possibility of unauthorized covert listening of conversations of the user, as well as premises, in which negotiations are carried out, by physical break of the audio circuit of the device used for negotiation.1 cl, 3 dwg

Description

The invention relates to the field of telecommunication systems and can be used to create devices with protection against unauthorized access to information transmitted via the audio path.

The prior art "Method of protection against unauthorized listening to conversations in the room in the intervals between telephone conversations and the device for its implementation" [EN 151425 U1, NM 1/68, 01.27.2000], containing the node blocking unauthorized access devices and ensure the operation of a regular telephone device, node blocking devices for unauthorized access and ensuring the work of a regular telephone set is made in the form of a remote execution unit installed outside the protected premises and zhaschee switching device connected to the incoming telephone line portion, and connected to a control unit, comprising allocation scheme of control commands and connected thereto electronic activity detector, connected to the standard telephone.

The disadvantage of this method and device is that the node blocking devices for unauthorized access and ensuring the work of a regular telephone set is made in the form of a remote unit installed outside the protected premises, which does not exclude the possibility of disconnecting or replacing this unit. Also in the device there is no indication of the mode of protection against unauthorized listening to conversations. The described method provides protection against unauthorized tapping of conversations in a room only in the intervals between telephone conversations, but not during negotiations, which allows an attacker to secretly listen to the user. Thus, the described method and device do not exclude the possibility of unauthorized activation of a telephone device with a digital communication channel.

It is known “Device for blocking unauthorized removal of information from a cell phone” [RU 2596935 С2, НММ 1/68, 09/10/2016]. A device for blocking unauthorized removal of information from a cell phone located in a case, contains an electronic node blocking the phone. The electronic node blocking the phone consists of a magnetically sensitive current key and a permanent magnet. A magnetically sensitive current switch is installed inside the phone case and is inserted into the gap of one of the power supply or signal lines of its nodes to ensure their disconnection, and a permanent magnet is placed on the wall of the said cover.

The disadvantage of this device is that it is intended only for mobile phones and can not be used for fixed phones, because The practice of using covers for fixed phones is not known. Also, you need additional equipment in the form of a cover with a built-in magnet, which also increases the size and weight of the mobile phone. The proposed solution is not universal, because Mobile phones from different manufacturers differ in size and shape, which will require the manufacture of a separate case for each phone model.

Closest to the claimed is "Mute device for interrupting the microphone circuit or connecting a shunt impedance through the microphone" [DE 3928298, NM 1/19, 28.02.1991], containing a light indication, a combination of suppression RlC and a resistor R2 connected to the transmitter, with On the one hand, to the handset, and on the other hand, a microphone and a mute button are placed on the handset.

The disadvantage of this device is that it only allows you to suppress the speech function and prevent background noise or conversation returned to the caller (breaking only one electrical circuit of the sound path for the microphone, but not for the speaker). Also in the device there are no means to prevent covert listening of user conversations.

The technical result achieved by the claimed invention is to prevent the possibility of unauthorized secretive listening to conversations of the user, as well as the room in which negotiations are being held, by physically breaking the sound path of the device used to conduct negotiations.

The technical result is achieved by the fact that the “Autonomous device for physical breaking of the audio path circuit”, which contains a button and a safe mode activation indicator, additionally introduces a control module and an audio path circuit break module, the input group of which is connected to the output group of the control module whose input is connected with the button output, the input of the safe mode activation indicator is connected to the output of the audio path circuit breaker, the output group of which is connected to the device output group, m, the control unit comprises a Schmitt trigger and the D-trigger whose output is connected to the output control unit having an input coupled to the input of a Schmitt trigger whose output is connected to the input of D-trigtera, wherein the circuit breaking module sound path comprises a relay unit.

FIG. 1 is a block diagram of an “Autonomous Device for the Physical Break of the Audio Path Circuit”.

FIG. 2 is a block diagram of the control module.

FIG. Figure 3 shows an example of enabling a stand-alone device to physically break the sound path circuit into a telephone.

A stand-alone device for the physical breaking of the audio path circuit (Fig. 1) contains a button 1, a control module 2, a module for breaking the audio path circuit 3 and an indicator for activating the safe mode 4.

The control module 2 (Fig. 2) contains a Schmitt trigger 5 and a D-trigger 6.

Module breaking the audio path 3 (Fig. 3) contains a relay unit.

The stand-alone device for the physical break of the audio path (Fig. 1) contains a button 1, a control module 2, an audio path break circuit 3 and an activation indicator for safe mode 4, the input of which is connected to the output of the audio path break 3, the group of inputs of which is connected with the output group of the control module 2, the input of which is connected to the output of the button 1, the output group of the open-loop circuit of the audio path 3 is connected to the output group of the device, and the control module 2 contains the Schmitt trigger 5 and D-flip-flop 6, you od coupled to an output of the control unit 2, whose input is connected to the input of the Schmitt trigger 5, whose output is connected to the input of D-flip-flop 6, wherein the circuit breaking unit 3 comprises sound path switch unit.

Under the safe mode means the state when the electrical circuit of the audio path is open. It is possible to turn on or turn off the safe mode only by directly acting on the control element, but not in any other way, including remotely or covertly from the user.

In addition to button 1, a controller or a microprocessor can be used as a switch (in the case of programmed control of the discontinuity), as well as other control elements of mode switching.

The control module 2 must have at least two stable (stable) states: the state of the open circuit and the state of the closed circuit. A state is also possible in which part of the electrical circuits are open, part is closed.

In the control module 2, the D-trigger stores the current state of the control module. The Schmitt trigger is necessary to avoid multiple switching of the D flip-flop as a result of the “bounce of the button” phenomenon. Other elements that perform similar functions may also be used.

The activation indicator of the safe mode 4 can be implemented as a light illumination (for example, in the form of LED illumination of the safe mode activation button), a sound alert, a vibration alert, etc.

Module breaking the audio path 3 consists of electromechanical relays.

The proposed invention can be used in any means known to those skilled in the art that provide for the transmission of sound messages. For example, it can be a fixed telephone set included in a wired telephone network, an IP telephone, any cordless telephone, for example, a mobile phone or smartphone, a walkie-talkie, as well as other devices that provide voice messages.

In the description of the invention, the standard IP-phone (hereinafter referred to as "the phone") is considered as an example. As an indicator of the activation of safe mode 3, an LED is used. If safe mode is active, the light is on; if it is off, the light is off.

The claimed invention works as follows.

A stand-alone device for the physical breaking of the sound path circuit is connected to the break in the electrical circuits of the telephone (Fig. 3).

The signal to press button 1 enters the control module 2, which changes its state to the opposite and stores this state until the next button is pressed. The new state of the control module 2 is transmitted to the open circuit of the audio path 3. The open circuit of the signal path 3 changes the current state of the relay to the opposite with the help of an electrical signal. In the case of an open electrical circuit closes it, in the case of a closed electrical circuit - opens.

If the circuit is open, the safe mode activation indicator 4 is activated. The safe mode activation indicator is active until the state of the control module 2 changes to the opposite.

The described device for the physical breaking of the sound path circuit is autonomous, since It is not associated with the control signals of the protected device. In the event of an unauthorized attack by an intruder on the protected device, the state of the autonomous device for the physical breaking of the sound path circuit will remain unchanged.

The circuit elements 10, 11 and 12, shown in FIG. 3, do not apply to the claimed device.

As these elements can be used, for example, speaker phone 10, microphone 11, audio codec 12, analog-to-digital converters and other elements.

Thus, the claimed invention allows the prevention of the possibility of unauthorized covert listening of the user's conversations, as well as the room in which negotiations are being held, by physically breaking the sound path of the device used to conduct negotiations.

Claims (1)

A standalone device for physical breaking of the audio path, containing a button and an indicator, characterized in that it additionally introduces a control module and an audio path breakout module, the input group of which is connected to the output group of the control module, the input of which is connected to the output of the button, the indicator input activation of the safe mode is connected to the output of the audio path breakout module, the output group of which is connected to the output group of the device, the control module contains a Schmitt trigger and D-t the trigger, the output of which is connected to the output of the control module, the input of which is connected to the input of the Schmitt trigger, the output of which is connected to the input of the D-flip-flop, with the audio path breaking module containing the relay unit.

Images