KR20010045669A - A system and method for monitoring a wiretap - Google Patents

Abstract

PURPOSE: A wiretap supervising system and a method thereof are provided to generate sound by previously stored sound source or supervise exactly whether there is the wiretap or not by using the previously stored spectrum basic information, inform the result of supervising the wiretap to a remote site, thereby capable of supervising concentrically any time whether there is the wiretap or not. CONSTITUTION: A tuning unit(10) tunes the corresponding radio frequency among radio frequency sensed through an antenna(Ant). An intermediate frequency converter(20) changes the radio frequency with the bandwidth of MHz-GHz into an intermediate frequency. An A/D converter(30) converts the analog signal of the intermediate signal into digital data and outputs the digital data. A ROM(41) stores a device discrimination code, and a program for discriminating the wiretap. A memory(42) stores frequency basic information, frequency spectrum basic information, sound source data for discriminating the wiretap, and alarming sound data to be outputted when discriminating the wiretap. A timer(43) counts the present time continuously. A key pad(50) has several keys for inputting a key such as time setting. An LCD(Liquid Crystal Display)(60) displays message. A D/A converter(71) converts the stored digital sound source data into an analog signal and outputs the data. A sound output unit(70) amplifies the analog signal and outputs the signal to a speaker(Sp). A communication unit(80) transmits the discriminating result data and a device discrimination code to a regional server through a LAN and receives the control data from the server. A control unit(40) performs a discrimination operation of wiretap by driving the program stored in the ROM(41).

Description

A system and method for monitoring a wiretap}

The present invention relates to an eavesdropping monitoring system and a monitoring method for determining whether eavesdropping is performed by a tapping device. It is about the monitoring method.

An eavesdropper is not a special thing, but an unused frequency (unlicensed) designed to reduce the size of the wireless microphone and replace complex parts with microchips to reduce overall size and save power through a low-power design. It is a kind of small voice transmitter using frequency).

According to the principle of operation, the tapping device is classified into a tapping device (VOX method) that taps the voice only when the voice is detected and the tapping tap is always on because the tapping power is always on. Due to the disadvantage that the tapping is possible for only about 48 hours and unnecessary power is wasted, VOX taps are mainly used. In addition, according to the transmission form of the eavesdropping voice, it is classified into a wireless eavesdropper and a wired eavesdropping device.

Wireless interceptor mainly uses the frequency band of 76MHz to 120MHz for FM band, 134MHz to 155MHz for VHF band, and 320MHz to 1200MHz for UHF band (especially 330MHz to 450MHz). The radio modulation method mainly uses FM or WFM.

Modern wiretaps are becoming more advanced and smaller, up to a quarter of the size of a thumbnail, so they can be inserted into anything you want, such as watches, phones, calculators, pictures, and mirrors. This is almost impossible, and can only be found by using a professional wiretap monitoring device.

These wiretaps are being used illegally mainly for the purpose of finding important information or secrets of a company or individual, and thus are emerging as social and ethical problems.

Therefore, several devices have been developed and used to determine whether the taps are installed illegally as described above. Most of the existing wiretap monitoring devices are manufactured by modifying a radio receiver, a frequency analyzer, or a spectrum analyzer. These monitoring devices detect the frequency bands of the received signals and display them on the LCD or monitor so that the wiretap supervisor can determine whether there is a specific frequency band having a dual ideal strength. Since it is necessary to rely on the skill or expertise of the wiretap supervisor, it is not only expensive to detect the wiretap, but is mainly performed once, so it is difficult to accurately identify the wiretap by an unspecified signal at the time of monitoring.

In addition, since this method does not accurately detect eavesdropping by the VOX-type taps that operate only during voice detection, the VOX-type taps are always kept in mind, and the sound is forced by a person for a certain time or continuously. There was a cumbersome problem that should arise. In addition, since most of the wiretap monitoring device is a stand-alone type, there is a cumbersome problem of monitoring the wiretap by monitoring the wiretap when necessary.

Therefore, the present invention was created to solve the above problems, and generates sound sound by pre-stored sound source data or accurately monitors the eavesdropping by using pre-stored spectrum basic information, and informs the eavesdropping monitoring result to the remote site. The purpose is to provide a monitoring system and a monitoring method that enables the centralized monitoring of eavesdropping at any time.

1 to 4 show an example of the entire network form of the wiretap monitoring system according to the present invention;

Figure 5 shows the configuration of a preferred embodiment of a single wiretap monitoring device according to the present invention,

Figure 6 shows the flow of a preferred embodiment of the wiretap monitoring method according to the present invention,

7 shows data of frequency spectrum for a tuning band.

Figure 8 illustrates a configuration of another embodiment of a single wiretap monitoring device according to the present invention,

9 shows an example of the spectrum before and after the sound output by the apparatus shown in FIG. 5 or 8;

Figure 10 shows the flow of another embodiment of the wiretap monitoring method according to the present invention.

※ Explanation of code for main part of drawing

10: tuning unit 20: intermediate frequency converter

30, 74: A / D converter 40: control unit

41: Rom 42: Memory

43: timer 50: keypad

60: LCD 70: sound output section

71: D / A converter 72: output amplifier

73: input amplifier 80: communication unit

100 _n : wiretap monitoring device 200 _n : local server

300: central monitoring server 400: monitor device

The wiretap monitoring device according to the present invention for achieving the above object, the tuning means for detecting a radio signal while varying the tuning band; Obtaining means for obtaining a frequency spectrum by the signal sensed by the tuning means; Storage means for storing frequency basic information and frequency spectrum basic information, and storing the obtained frequency spectrum; A sound output means for outputting a sound; And controlling the sound output of the sound output means according to a preset sound output time, varying the tuning means, comparing the acquired and stored frequency spectrum with basic information of the pre-stored frequency spectrum, and determining whether to eavesdropping therefrom. And sound detection means for detecting whether or not the sound of the to-be-applied sound is input from the outside, wherein, when detecting the sound of the sound detection means, the control means respectively before and after the sound detection. It is characterized by comparing the obtained frequency spectrum and determining whether there is eavesdropping from it.

An eavesdropping monitoring method according to the present invention comprises: a first step of obtaining a frequency spectrum of a radio-detected signal; Generating a sound; Acquiring a frequency spectrum of a signal wirelessly detected after the sound generation output; And a fourth step of comparing both spectra obtained in the first step and the third step, and determining whether the wire is eavesdropped therefrom.

In addition, the tapping monitoring system according to the present invention, the tapping monitoring device for generating a sound sound in the predetermined active operation time zone to determine whether the tapping and transmitting the tapping result data according to the tapping; And a central monitoring device for centrally monitoring whether the tapping is performed from the tapping result data received from the plurality of tapping monitoring devices through the communication network.

Hereinafter, the configuration and operation of an embodiment of the wiretap monitoring system and monitoring method according to the present invention will be described in detail with reference to the accompanying drawings.

Figure 1 illustrates the entire network form of the wiretap monitoring system according to the present invention, for example, generating and outputting sound sounds, obtaining the frequency spectrum of the radio-detected signal before and after the sound generation output, and tapping from the frequency spectrum. a plurality of taps monitoring device (100 _n) for transmitting a rear taps is determined that the data determines whether or not; A local server 200 _n connected to the plurality of wiretap monitoring devices 100 _n through a local area network (LAN) to receive the tapping result data, and to transmit the tapping result data through a public telephone network (PSTN); It is configured to include a central monitoring server 300 for outputting and displaying the result of tapping discrimination data received through the public telephone network on the monitor device 400, and centrally monitors whether the tapping.

In addition, the wiretap monitoring system according to the present invention may be implemented in the form of using serial communication or a USB (Universal Serial Bus) port as shown in FIGS. 2 to 4, and in some cases, a discrete DC output port (Discrete DC) It can also be implemented in the form of being connected to a dedicated terminal of an external security company by using an output port).

FIG. 5 illustrates a configuration of a preferred embodiment of the wiretap monitoring device 100 _n according to the present invention among the network configurations of FIG. 1, wherein a corresponding high-frequency signal of a radio frequency detected through an antenna Ant is included. A tuning unit 10 for tuning a high frequency signal; An intermediate frequency converter (20) for converting the tuned high frequency signals of several MHz to several GHz into an intermediate frequency; An A / D converter (30) for converting and outputting the converted analog signal of the intermediate frequency band into digital data; A ROM 41 in which a device identification code and a program for determining eavesdropping are stored; A memory 42 storing frequency basic information, frequency spectrum basic information, and, in some cases, sound source data relating to sound for determining eavesdropping and sound source data relating to a warning sound to be output at the time of tapping; A timer 43 which keeps track of the current time; A keypad 50 for key input such as time setting; An LCD (Liquid Crystal Display) 60 for the message window; A D / A converter 71 for converting and outputting digital sound source data stored in the memory 42 into an analog signal, and an output amplifier 72 for amplifying the converted and output analog signal and outputting the converted analog signal to a speaker Sp or the like. Sound sound output unit 70 composed of; Send the result data and device identification code of wiretap to local server (dedicated PC in case of serial communication or dedicated terminal in case of integrated configuration with external security company) through connected local area network (LAN) and control from server Communication unit 80 for receiving data; And a controller 40 for setting the tuning band of the tuning unit 10 and driving the program stored in the ROM 41 to perform eavesdropping determination.

Figure 6 illustrates the flow of a preferred embodiment of the wiretap monitoring method according to the present invention, the following describes in detail the monitoring method of Figure 6 according to the present invention with reference to the overall configuration of Figure 1 and the detailed configuration of FIG. .

First, the user installs the tapping monitoring device 100 in a place where there is a risk of tapping by the tapping device, and then, through the keypad 50 of the tapping monitoring device 100 (or via a server or a dedicated PC), A general operating time zone (for example, always (24 hours)) and an active operating time zone (for example, 9 pm to 10 pm) are set, and the control unit 40 stores the set operating time zone and always operates In the following, the wiretap monitoring is performed through the normal RF reception, and active tapping monitoring is performed by generating a sound sound in the set active operation time period, which will be described in detail below.

In addition, frequency basic information and frequency spectrum basic information are pre-stored in the memory 42. The frequency basic information may include common frequency distribution information or frequency information which is actually used (this is information for consideration in selecting a scanning frequency). The frequency spectrum basic information is information obtained before an artificial sound output or before a tapping target source exists.

In the state where the tapping monitoring device is installed in a specific place as described above, the timer 43 in the tapping monitoring device 100 keeps track of the current time, and the controller 40 is connected to the timer 43. It is checked whether the current time tracked and maintained is included in the pre-set and stored active operation time zone (S10).

As a result of the check, if the current time is not included in the preset active operation time zone, the controller 40 performs the always operation mode. For this purpose, the controller 40 is stored and driven in the ROM 41. The eavesdropping discrimination operation is performed by the program.

The tuning unit 10 detects a high frequency signal of a tuning band set by the control unit 40 among the high frequency signals detected through the antenna Ant, and the detected high frequency signal is transmitted to the intermediate frequency converter 20. After the conversion to the intermediate frequency by the A / D converter 30 is converted into digital data.

The controller 40 determines the presence or the size of a signal component with respect to the currently tuned band from the size of the converted digital data, and sets the next tuning band to the tuner 10. According to the procedure described above, the controller 40 obtains a frequency spectrum while scanning a preset full band, for example, a frequency band of 10 MHz to 2 GHz or more by referring to frequency basic information previously stored in the memory 42 (S11). Data is stored in the form as shown below.

7 is an example in which the tuning band is sliced into a 10 KHz band in the 135 MHz to 155 MHz and the 320 MHz to 450 MHz bands, and the other band is sliced into the 30 KHz band, and the 320 MHz to 450 MHz band according to the priority of a preset band search. Is scanned first, followed by the 135 MHz to 155 MHz band, followed by the 450 MHz to 1,2 GHz band.

The controller 40 compares the frequency spectrum thus obtained with the basic information on the frequency spectrum previously stored in the memory 42 (S12) to check whether the bands detected by the signal are identical to each other, and determines whether the signal is intercepted. (S13).

If the signal detected bands are not identical to each other and the controller 40 determines that the controller is currently eavesdropping, the controller 40 drives the sound output unit 70 to output a sound. In some cases, the sound source data related to the warning sound such as the siren sound, which is previously stored in the memory 42, is read out, and the D / A converter 71 of the sound output unit 70, and the output amplifier 72. By outputting to the speaker Sp through, the eavesdrop monitoring device 100 _n and a person located in close proximity to the eavesdropping facts so that the user can immediately take appropriate measures, such as searching for the eavesdropper, and the control unit ( 40 through the communication unit 80, the local eavesdropping determination data and the device identification code stored in the ROM 41, the local server 200 through a local area network (LAN) connected and connected _n ) or the host device, and the eavesdropping operation is continuously performed during the normal operation time zone.

Received from the plurality of taps monitoring device (100 _n) and the LAN to said local server (200n), the tapping monitoring device (100 _n) taps monitoring device (100 _n) at each or a plurality of the data received from the access connection via After collecting the collected data at regular time intervals, the central monitoring server 300 is connected and connected through a public telephone network to receive data received from the wiretap monitoring device 100 _n through a public telephone network through a gateway. The monitoring server 300 is to be transmitted (S14).

Therefore, the central monitoring server 300 outputs and displays the data received through the public telephone network for each device identification code on the monitor device 400 and outputs a warning sound when there is discrimination data indicating that the data is being intercepted. whether eavesdropping on by the central monitoring server 300, the taps monitoring device (100 _n) is specified from the device the identification code allows the management operator in the received data, that is, all the taps monitoring device (100 _n) provided It is possible to check whether the tap is installed at the location (placement), and from this, centralized monitoring is performed.

8 illustrates a configuration of another embodiment of the wiretap monitoring apparatus according to the present invention, which comprises: an input amplifier 73 for amplifying an analog audio signal input through a microphone Mic to a predetermined level in the same configuration as that of FIG. And an A / D converter 74 (in some cases, the A / D converter 30 may be used) for converting and outputting the amplified output analog audio signal into digital data.

In the wiretap monitoring device configured as described above, the controller 40 is always inputted through the input amplifier 73 and the A / D converter 74 while always obtaining the frequency spectrum as described above. Continue to check the sound input from the outside through the microphone from the data.

When the control unit 40 confirms the sound input from the outside through the microphone Mic while performing the operation, the control unit 40 obtains the spectrum obtained before the sound input confirmation from the outside and the sound input obtained after the sound input confirmation. By comparing the spectrum to determine whether the eavesdropping from the above as described above, the eavesdropping determination operation is performed only when confirming the sound input from the outside, wherein the control unit 40 after checking the sound input from the outside The obtained spectrum may be compared with the stored basic information on the frequency spectrum to determine whether the eavesdropping is performed, and the subsequent process according to the eavesdropping is performed as described above.

The controller 40 continuously checks whether the current time tracked and maintained by the timer 43 is included in the preset active time zone while performing the above operation in the normal time zone.

During the operation, if the current time is included in the preset active time zone, the controller 40 causes the corresponding eavesdropping determination operation to be performed by a program stored and driven in the ROM 41. This is as follows.

First, the control unit 40 drives the sound output unit 70 to output a sound sound, or in some cases, the sound source data previously stored in the memory 42, preferably sound source data relating to the development of a person. Read and output it to the D / A converter 71 to convert the digital sound source data into an analog signal, and the output amplifier 72 amplifies the converted analog signal by power and generates sound through a speaker Sp or the like. Output it (S22).

The sound output through the speaker Sp is continuously performed for a predetermined time, and after the output of the sound is made, the control unit 40 responds to a signal detected by the tuning unit 10 while the sound is output. As described above, the frequency spectrum is obtained again (S23), and the frequency spectrum (S21) as shown in FIG. 7 obtained before the sound output is compared with the frequency spectrum obtained after the sound output (S24), and the signal detected band. Check whether the same is the same (S30) to determine whether or not eavesdropping from this. This is because if the tapping device is installed within a predetermined distance from the tapping monitoring device 100 _n , the tapping device starts tapping with the output of the sound sound, and sends out the tapping contents through an unauthorized frequency band. It is based on the fact that the spectrum of the frequency detected by the tuning unit 10 before and after and obtained by the control unit 40 is changed as shown in FIG.

When the result of the comparison of the obtained both spectra is not the same, that is, when a signal component that does not exist in the spectrum obtained before the sound sound output exists in the spectrum obtained after the sound sound output, the control unit 40 It is determined that the eavesdropping is performed (S40) as described above to drive the sound output unit 70 to output a sound, or in some cases to output a warning sound such as a siren sound as described above, the communication unit 80, the wiretap discrimination result data and the device identification code stored in the ROM 41 are transmitted to a local server 200 _n or a higher level device through a connected local area network (LAN) or the like. Intensive monitoring is carried out in Esau, and the active eavesdropping discrimination operation is performed by a preset function. Each operation time zone (9:00 to 10:00 PM) becomes periodically made of.

In the above embodiment, even when both spectra are the same as a result of the comparison of both spectra obtained before and after the sound output of the controller 40, the controller 40 may be a constant tapping device instead of a VOX tapping device. Frequency spectrum basic information about one frequency spectrum obtained before or after the sound sound output and the signal components receivable in the installation area which is previously stored in the memory 42 in a form similar to that of Fig. 9 (1). By comparison (S31), it is determined whether the tapping device is installed or not, according to the comparison result (S32), and the subsequent process according to the tapping determination is made as described above.

10 illustrates the flow of another embodiment of the wiretap monitoring method according to the present invention. Hereinafter, the monitoring method of FIG. 10 according to the present invention will be described in detail with reference to the entire configuration of FIG. 1 and the detailed configuration of FIG. .

FIG. 10 relates to another monitoring method for eavesdropping when the current time tracked by the timer 43 is included in a preset stored active time zone (S50). After comparing the spectrum before and after the sound output as described above to determine whether eavesdropping from this, after the sound output (S51) after obtaining the frequency spectrum of the signal detected from the tuning unit 10 (S52), after the sound output The obtained frequency spectrum is compared with the basic information of the frequency spectrum previously stored in the memory 42 (S53) to determine whether eavesdropping is performed as described above according to whether the two spectrums are the same (S54). Subsequent process S55 is the same as described above.

The reason why the sound is first output in the embodiment comparing the basic information with the frequency spectrum is to detect the eavesdropping by the VOX type taps as described above.

In the above-described embodiment, the keypad 50 is replaced with a button switch (reset switch) to implement only a minimum function, and other functions are inputted through a separate server or a dedicated PC, and the LCD It is possible to implement a method to replace the (60) in the form of LED to implement only the minimum function and to display other graphic output (spectrum information output, etc.) on a separate server or a dedicated PC.

In addition, the tapping monitoring system may be implemented using a conventional tapping monitoring apparatus as well as an existing tapping monitoring apparatus according to the present invention. In this case, after the tapping monitoring apparatus has a communication unit, tapping of an externally generated sound By determining whether or not to transmit the result of the tapping determination result through the communication unit, the centralized monitoring is also performed at this time.

In addition, preferred embodiments of the present invention described above are disclosed for purposes of illustration, and those skilled in the art will be able to make various modifications, changes, substitutions and additions through the spirit and scope of the present invention disclosed in the appended claims.

The wiretap monitoring system and the monitoring method according to the present invention configured as described above accurately use the sound tap or the pre-stored frequency spectrum information of the device, and the tapping by the VOX type tapping device as well as the tapping device. By monitoring and monitoring the result of eavesdropping centrally through the communication network, all the eavesdropping monitoring devices have to be monitored by individuals individually, without having to pay the hassle or expensive expenses for eavesdropping detection. It is a very useful invention that can more effectively monitor eavesdropping where privacy is needed.

Claims (17)

A first step of obtaining a frequency spectrum of the radio-detected signal; Generating a sound; Acquiring a frequency spectrum of a signal wirelessly detected after the sound generation output; And And a fourth step of comparing both spectra obtained in the first step and the third step and determining whether there is a tap. The method of claim 1, The first to third steps of the wiretap monitoring method, characterized in that is made periodically at a predetermined time. The method of claim 1, In the fourth step, when both frequency spectrums are the same as the result of the comparison, the eavesdrop monitoring method according to claim 1, wherein the stored frequency spectrum basic information is compared with the obtained frequency spectrum to determine whether the eavesdropping is performed. A first step of generating a sound; Acquiring a frequency spectrum of a signal wirelessly detected after the sound generation output; And And a third step of comparing the acquired frequency spectrum with prestored frequency spectrum basic information and determining whether there is an eavesdropping therefrom. The method according to any one of claims 1 to 4, The first step further comprises a higher step of selecting a scanning frequency using frequency basic information. The method of claim 5, The sound output is a tapping monitoring method, characterized in that made from pre-stored sound source data. The method according to any one of claims 1 to 4, The sound output is a tapping monitoring method, characterized in that made from pre-stored sound source data. A first step of obtaining a frequency spectrum of the radio-detected signal; A second step of checking whether or not the sound to be heard from the outside is input; And And a third step of comparing the frequency spectrum obtained before the confirmation of the sound input with the frequency spectrum obtained after the confirmation of the sound input and determining whether the eavesdropping is based on the comparison result. . The method of claim 8, The first step further comprises a higher step of selecting a scanning frequency using frequency basic information. Tuning means for sensing a radio signal while varying the tuning band; Obtaining means for obtaining a frequency spectrum by the signal sensed by the tuning means; Storage means for storing frequency basic information and frequency spectrum basic information, and storing the obtained frequency spectrum; A sound output means for outputting a sound; And Control means for controlling the sound output of the sound output means according to a preset sound output time, varying the tuning means, comparing the acquired and stored frequency spectrum with basic information of the stored frequency spectrum, and determining whether to eavesdrop from it. Tapping monitoring device configured to include. The method of claim 10, It further comprises a sound detecting means for detecting the input of the sound to be heard from the outside, When detecting the sound of the sound detecting means, the control means compares each obtained frequency spectrum before and after the sound detection, and determines whether the eavesdropping from it. The method of claim 10, And the control means causes the audible sound output means to output a warning sound when determining the eavesdropping from the obtained frequency spectrum. The method of claim 10, It further comprises a communication means for data communication with the outside, The storage means further stores the device identification code, And the control means transmits the wiretap determination result data and the device identification code to a destination through the communication means. The method according to any one of claims 10 to 13, And the storage means further stores sound source data, and the sound output means reads out the sound source data and converts the sound into data. An eavesdropping monitoring device generating and outputting a sound sound in a preset active operation time period, acquiring a frequency spectrum of a radio-detected signal after outputting the sound sound generation, and determining whether to eavesdropping from the frequency spectrum, and transmitting eavesdropping discrimination result data; And An eavesdrop monitoring system comprising a central monitoring unit for centrally monitoring whether eavesdropping is received from eavesdropping discrimination data received from a plurality of eavesdropping monitoring devices through a communication network. An eavesdropping monitoring apparatus for acquiring a frequency spectrum of a signal that is wirelessly detected, determining whether to tap the externally generated sound from the frequency spectrum, and transmitting the same through a communication means equipped with tapping result data; And And a central monitoring device connected to a plurality of the wiretap monitoring devices through a communication network, the central monitoring device for centrally monitoring whether or not wiretaps are performed from the tapping result data received from the wiretap monitoring device. Generates and outputs a sound sound in a preset active operation time period, and determines whether the wire is tapped from the frequency spectrum of the signal that is wirelessly detected after outputting the sound sound, or checks whether the to-be-taped sound is input from outside. An eavesdropping monitoring device which compares the frequency spectrums obtained before and after inputting respectively, determines whether the eavesdropping is performed according to the comparison, and transmits the eavesdropping result data; And An eavesdrop monitoring system comprising a central monitoring unit for centrally monitoring whether eavesdropping is received from eavesdropping discrimination data received from a plurality of eavesdropping monitoring devices through a communication network.