JP2000163678A - Radio-wave alarm - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a radio-wave alarm which can detect the presence/absence of tapping radio equipment regardless of the modulating system, installed position, and installed state of the radio equipment. SOLUTION: A radio-wave alarm is provided with an antenna section 1 which outputs a reception signal upon receiving a transmission signal sent from tapping radio equipment, a frequency band-wise electric field intensity digitizing section 40 which digitizes the electric field intensity of the reception signal outputted from the antenna section 1 at every band, and a data base in which a prescribed criterion is recorded. The alarm is also provided with a checking section 41 which discriminates the presence/absence of abnormal radio waves based on the output of the digitizing section 40 and the criterion recorded in the data base 5 and an alarm display 9 which displays the state discriminated by the checking section 41.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio alarm for detecting an abnormal radio wave caused by eavesdropping.

[0002]

2. Description of the Related Art FIG.
It is a block diagram which shows the conventional eavesdropping wireless device discovery apparatus shown by No. 46 gazette. In the figure, an antenna unit 1 receives a radio signal and outputs a received signal. Broadband amplifier 2
Amplifies the received signal received by the antenna unit 1. The demodulation unit 29 converts the amplified received signal into an AM inverse transform or an FM
The audio signal is demodulated by performing the inverse conversion.

On the other hand, an input unit 31 amplifies an audio input signal from an audio pickup 30 such as a microphone as required. Then, the cross-correlation function calculation unit 32 calculates a cross-correlation function value of the audio signal input from the antenna unit 1 and the audio signal input from the audio pickup 30, and the detection unit 33 eavesdrops on the cross-correlation function value. The presence or absence of the wireless device is determined, and the audiovisual display unit 11 displays the wireless device.

In such an eavesdropping radio detection device, the antenna unit 1 receives radio waves emitted by the eavesdropping radio 34, and the audio signal demodulated by the wideband amplifier 2 and the demodulation unit 29 is sent from the audio pickup 30 to the input unit 31. Has a waveform similar to the audio signal input to the That is, the audio signal obtained by demodulating the received radio wave and the audio pickup 3
Since there is a high correlation between the audio signals captured by 0, the detection unit 33 tests the magnitude of the correlation function calculated by the cross-correlation function calculation unit 32 by comparison with a reference to detect the presence of an eavesdropping radio. can do. Note that the test result of the detection unit 33 is displayed by the audiovisual display unit 11 as an alarm sound, a lamp, or the like.

[0005]

In a conventional eavesdropping wireless device detecting apparatus having such a configuration, a target eavesdropping wireless device employs a general specific modulation method such as AM modulation or FM modulation. As a result, the audio signal demodulated by the inverse conversion processing is used as the material for determining the presence or absence of the eavesdropping radio. Therefore, if the eavesdropping radio employs a modulation scheme different from the assumption, or if the modulation method is finely changed, there is a problem that the eavesdropping radio cannot be found because the sound cannot be demodulated correctly.

In order to compare the waveform of an audio signal obtained by inversely converting radio waves with the waveform of an audio signal obtained from an input of the pickup 30, the input signal of one frequency band must be measured for a long time. No. For this reason, only the frequency band which is extremely limited in practice has to be monitored.

Also, since the actual voice present at the monitoring target location is used as a criterion, if the distance between the position of the pickup 30 of the audio signal with respect to the input unit 31 and the position of the eavesdropping radio 34 is large, the output of the input unit 31 Since the correlation between the signal and the output signal of the demodulation unit 29 is low, there is a problem that the eavesdropping wireless device 34 cannot be detected.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem, and has found out the existence of an eavesdropping radio in an arbitrary frequency band irrespective of the modulation method and the mounting position and mounting method of the eavesdropping radio. It is another object of the present invention to obtain a radio alarm capable of detecting an eavesdropping radio.

[0009]

A radio alarm according to the present invention receives a transmission signal transmitted from an eavesdropping radio,
An antenna unit for outputting a received signal, a frequency band electric field intensity quantifying unit for quantifying the electric field intensity of the received signal output from the antenna unit for each band, a database for recording a predetermined criterion, and an electric field for each frequency band A testing unit for determining the presence or absence of an abnormal radio wave based on the output of the intensity quantifying unit and the determination criterion recorded in the database is provided with an alarm display for displaying the status of the determination by the testing unit.

[0010] The frequency band-specific electric field strength digitizing section sequentially changes the frequency of the band at predetermined time intervals.

[0011] Also, the alarm unit has a counter unit for measuring the duration during which the result of the test unit is that there is an abnormal radio wave, and the alarm display unit has an eavesdropping radio when the counter value exceeds a predetermined value. To inform.

A data collection unit for creating update information of a database based on an output of the electric field intensity quantification unit for each frequency band; and a switch unit for instructing a disposal content of the data collected by the data collection unit. By operating the switch unit, the data stored in the data collection unit can be discarded or updated.

The testing unit compares the magnitude of the electric field strength stored in the database with an offset value and the output of the frequency-band-based electric field strength quantifying unit to compare the magnitude of the electric field strength stored in the database. If the output of the electric field intensity quantifying unit for each frequency band is greater than the value obtained by adding the offset value to the magnitude of the intensity, it is determined that an abnormal radio wave is present.

Further, the average of the values obtained by squaring the output of the electric field strength digitizing unit for each frequency band, the maximum value of the variance or estimation section, and the maximum value of the reliability section are obtained, and this value and the magnitude of the electric field strength stored in the database are obtained. The average of the squared values of, the variance or estimation interval, a comparison unit that performs a magnitude comparison with the reliability interval, the comparison unit, the value obtained by processing the output of the electric field strength digitization unit for each frequency band, If the value is larger than the value stored in the database, it is determined that there is an abnormal radio wave.

Further, the average and the variance of the output of the electric field intensity digitizing section for each frequency band are obtained, and the average and the variance of the value obtained by calculating the average and the variance of this value and the square of the electric field intensity stored in the database are calculated. An abnormal radio wave is present when the t-test operation unit has a t-test operation unit that performs a test, and the t-test operation unit outputs that there is a significant difference between the value of the database and the output of the electric field intensity quantification unit for each frequency band.

The comparing section compares the output of the electric field strength digitizing section for each frequency band with the minimum output value required for wireless transmission from indoors to outdoors, and the judgment result of the comparing section is negative. In this case, the determination of the significant difference is ignored, and it is determined that there is no abnormal radio wave.

The magnitude of the electric field strength stored in the database is sampled a plurality of times at predetermined time intervals, and the largest data is adopted as a registered value.

Further, the magnitude of the electric field strength stored in the database is sampled a plurality of times at predetermined time intervals, and the average or variance value of the section where the average value of the acquired data is the largest, or the reliability section. The maximum value of the estimated section is adopted as a registered value.

The magnitude of the electric field intensity stored in the database is obtained by sampling a plurality of data in a predetermined time unit and excluding small data determined to be not belonging to the same population from an average value for each time. The average value or variance value of the obtained data or the maximum value of the reliability section / estimated section is adopted as the registered value.

The magnitude of the electric field strength stored in the database is obtained by sampling a plurality of data in a predetermined time unit and excluding large data determined to be not belonging to the same population from an average value for each time. The average value or variance value of the obtained data or the maximum value of the reliability section / estimated section is adopted as the registered value.

Further, the frequency band-based electric field intensity quantifying section does not execute the detection processing for an arbitrary frequency among a plurality of frequencies.

Further, the alarm display device is used as an alarm means.
It has a speaker or a rotating light.

Further, the alarm display device has a display device for displaying a frequency, a received power or a received voltage, a judgment criterion, and a judgment result by character display, as means for notifying and judging the judgment result.

[0024] Further, there is provided an output unit for notifying a judgment result and an alarm of the verification unit to a remote place using a public line or the like, and an alarm display device of the remote place notifies the presence or absence of an abnormal radio wave.

Further, the alarm display notifies the frequency, the received power or the received voltage, the criterion, and the determination result regardless of the determination result.

When it is determined that an unknown radio wave transmitted from the wiretap radio is present, the alarm display notifies the frequency of the radio wave, the received power or voltage, the criterion, and the result of the determination.

When it is determined that an unknown radio wave transmitted from the wiretap radio is present, the alarm display notifies the frequency, received power or received voltage, a judgment criterion, and a judgment result of a plurality of radio waves before and after the radio wave. I do.

In the alarm display, the notification information includes the identification name or number of the device to be notified.

In the alarm display, the notification information includes a telephone number to which the device to be notified is connected.

Further, in the alarm display, the notification information includes an address of a network to which the device to be notified is connected.

[0031]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a block diagram showing a radio alarm of the present invention. In the figure, 1 is an antenna unit, 2 is a variable band amplifier, and 3 is a frequency control unit for changing the frequency band of the band amplifier 2 in ascending order one after another within a certain range (hereinafter, this operation is referred to as sweep). Is an electric field intensity quantifying unit for quantifying the magnitude of the output of the band amplifier 2, 5 is a database for storing the electric field intensity when there is no eavesdropping radio, and 6 is a quantified band amplifier 2
Is a t-test calculation unit that performs a t-test to confirm whether the output value of the field has a significant difference with respect to the record in the database 5, and 8 is the output of the electric field strength digitizing unit 4 determined to have a significant difference and the set value. A counter section 7 for counting the number of consecutive times that the output of the comparing section 8 confirms abnormal radio waves; and 40, a variable band amplifier 2 and a frequency control section 3.
And an electric field intensity digitizing unit for each frequency band constituted by the electric field intensity digitizing unit 4 and a test unit 41 constituted by the t test calculating unit 6 and the comparing unit 8. The electric field intensity quantifying unit 40 for each frequency band samples the output of the antenna unit 1 with a D / A converter (not shown) and performs a Fourier transform, or a band-pass filter and a band amplifier 2 with respect to the output of the antenna unit 1. The devices can be replaced by devices arranged in parallel. Further, the processing of the counter unit 7 can be replaced with a timer that measures the duration of time after it is first determined that there is an abnormal radio wave. Reference numeral 9 denotes an alarm display unit as an alarm notification unit that issues an alarm when there is a significant difference that is not rejected in the test in the t-test operation unit 6 and the comparison in the comparison unit 8.

Here, the t-test is one of the methods for testing whether or not there is a significant difference between the respective means of two statistical variable groups, and in the present embodiment, the database 5 Is performed on the comparison between the known information stored in the sample and the new measurement result. Since the sample is basically a two-sample problem, the population 1 (known sampling data) and the population 2 (newly acquired sampling data) are the same. If so, there is no need to issue an alarm, so the hypothesis that "group 1 is not the same as group 2" is tested, and if it is "denied", there is no need to issue an alarm.

Specifically, the presence or absence of a significant difference between the two groups is determined based on the equation in FIG. In the formula of FIG. 2, X1: average value of population 1 (database 5) X2: average value of population 2 (measurement result) n1: number of data of population 1 (database 5) n2: number of data of population 2 (measurement result) S1: Sum of squares of group 1 (database 5) S2: Sum of squares of group 2 (measurement results) φ1: degrees of freedom of group 1 (database 5) φ2: degrees of freedom of group 2 (measurement results) At this time, if the limit value t (φ, P) <t0 in the t table is satisfied, it means that there is a significant difference between the average value X1 and the average value X2. That is, there is a significant difference in the comparison between the known information stored in the database 5 and the new measurement result. (For details, see References: “Introduction to the Mathematical Seminar Extra Number: Modern Mathematics“ 11 ”Statistical Estimation-2 Sample Problem”, Publisher: Nihon Hyoronsha, No. 1
Chapter Integrative Hypothesis and Test and Chapter 2 Perense
See Fisher problem. )

In the radio alarm having the above configuration, the band amplifier 2 is controlled by the frequency control unit 3 to the antenna unit 1.
, The electric field intensity for each frequency band is sampled by the electric field intensity quantifying section 4. The t-test operation unit 7 performs a t-test on the presence or absence of a significant difference between the sampled data and the sampled data stored in the database 5 so that the state of the radio wave being received is significant compared to the state without the eavesdropping radio. You will see if you have made a difference.

If it is not possible to continue checking the significant difference a sufficient number of times in the counter section 7, the result of the determination of the significant difference is rejected, so that the portable telephone, temporary carry-in equipment, etc. In addition, the effect of devices that emit radio waves for a short time can be ignored, leaving only the effects of devices that constantly emit radio waves, such as stationary eavesdropping radios, as significant differences that cannot be ignored. .

Further, the comparison unit 8 rejects a significant difference in a frequency band having a small electric field strength, which cannot be received outdoors by penetrating a reinforcing bar or a steel structure such as an office or the like, and is effective as an eavesdropping radio. Only as a significant difference. Therefore, a warning is issued to the user by the alarm display device 9 only when a change indistinguishable from the case where the stationary eavesdropping wireless device is newly installed is present in the frequency range to be swept.

Embodiment 2 FIG. 3 is a block diagram showing another example of the radio wave alarm of the present invention. In the figure, 1 is an antenna unit, 2 is a variable band amplifier, 3 is a frequency control unit for sweeping with this band amplifier, 4 is an electric field intensity quantifying unit that quantifies the magnitude of the output of the band amplifier 2, Reference numeral 5 denotes a database that records a judgment value for each frequency. Reference numeral 8 denotes a comparison unit that compares the judgment value with a digitized magnitude of the electric field strength. Reference numeral 11 denotes an output device such as a serial communication interface, and reference numeral 11 denotes an audiovisual display unit as an alarm notification unit for displaying an output result by a lamp or a sound.

In the radio alarm device of the present embodiment, rejection of sampling data having a small electric field strength by the t-test used in the first embodiment is replaced by a comparison between the judgment value and the sampling data. That is, the formula in FIG. 2 of the first embodiment, in which the difference between two average values is usually performed by a t-test, is modified into a formula in FIG.

In the equation of FIG. 4, t (φ, P): the degree of freedom φ of the t distribution, the value of t at the significance level P n1: the number of data in the group 1 (database 5) n2: the number of data in the group 2 (measurement results) Number of data X1: Average value of population 1 (database 5) AVRmax: Maximum value that X2 can take with a reliability of (1-P / 2) (limit at which no significant difference can be determined). At this time, if X2> AVRmax is satisfied, it means that there is a significant difference between the average value X1 and the average value X2. (Refer to the references above for details.)

In this embodiment, the rejection of sampling data having a small electric field strength by the t-test used in the first embodiment is replaced with a comparison between the judgment value and the sampled data, so that the t-test is performed on the sample data. It can be replaced by a simple comparison between the average and AVRmax. According to this equation, (average of sample data)> AVRmax is the same as judging that there is a significant difference by the t-test. Therefore, the electric field strength A which cannot pass through the reinforcing bars and steel frames of an office or the like and cannot be received outdoors.
By employing the larger VRmax as the determination criterion, the processing of the test unit 41 of the first embodiment can be realized by the comparison unit 8 of the second embodiment as it is.

Therefore, the band amplifier 2 sweeps the input signal of the antenna unit 1 by the frequency control unit 3 so that the electric field intensity for each frequency band is sampled by the electric field intensity quantifying unit 4, and this sampling data is stored in the database 5 By comparing the determination value stored in the storage unit with the magnitude by the comparing unit 8, it is determined whether a radio wave of a non-negligible electric field strength has appeared. Further, the detection result is displayed on the audiovisual display section 11 via the output section 10 to display the detection status of the radio wave.

Embodiment 3 FIG. 5 is a block diagram showing another example of the radio wave alarm of the present invention. In the figure, 1 is an antenna unit, 2 is a variable band amplifier, 3 is a frequency control unit for sweeping with this band amplifier, 4 is an electric field intensity quantifying unit that quantifies the magnitude of the output of the band amplifier, 5 Is a database that records the judgment value for each frequency, 8 is a comparing unit that compares the judgment value with the digitized magnitude of the electric field strength, 7 counts the number of consecutive times that the sampling data exceeds the judgment value, A counter unit 9 compares the value of the counter with the set number of times, and an alarm display unit 9 issues an alarm when there is a significant difference that cannot be rejected in all tests and comparisons.

In the radio alarm having the above-described configuration, the frequency controller 3 sweeps the input signal of the antenna unit 1 by the frequency control unit 3 so that the electric field intensity for each frequency band is converted into the electric field intensity numerical unit 4. To sample. By comparing the size of the sampled data with the determination value stored in the database 5 by the comparing unit 8, a threshold value for testing a significant difference with respect to the sampled data when there is no eavesdropping wireless device and rejecting the sampled data having a small electric field strength. Substitute for comparisons with values. In addition, unless the sampling data continues to exceed the determination value by a sufficient number of times in the counter section 7, the determination result is rejected, and thus the mobile phone, the temporary carry-in device, etc.
The effect of a device that emits radio waves for a short time will be ignored. Eventually, if there is a significant difference that cannot be ignored only by the effect of a device that continuously emits radio waves, such as a stationary eavesdropping radio, a warning is issued to the user by the alarm display 9.

Embodiment 4 FIG. FIG. 6 is a block diagram showing another example of the radio wave alarm of the present invention. In the figure, 1 is an antenna unit, 2 is a variable band amplifier, 3 is a frequency control unit for sweeping with this band amplifier, 4 is an electric field intensity quantifying unit that quantifies the magnitude of the output of the band amplifier, 5 Reference numeral 8 denotes a database in which a judgment value for each frequency is recorded. Reference numeral 8 denotes a comparison unit that compares the judgment value with the digitized magnitude of the electric field strength. Reference numeral 10 denotes an output device that notifies a comparison result to the outside.
Reference numeral 12 denotes a data collection unit that stores the output of the electric field intensity quantification unit 4. Reference numeral 13 denotes whether the database 5 is updated based on the data stored in the data collection unit 12, or the data collection unit 12.
Is a switch for instructing whether to discard the data.

In the radio alarm having the above-described structure, the band width amplifier 2 sweeps the input signal of the antenna unit 1 by the frequency control unit 3 so that the electric field intensity for each frequency band can be converted into the electric field intensity digitizing unit 4. To sample. By comparing the sampling data with the judgment value stored in the database 5 by the comparing unit 8, it is confirmed whether the electric field intensity of the frequency band is too strong or not. Also,
As long as the sampling data does not continue to exceed the determination value a sufficient number of times in the counter unit 7, the determination result is rejected, and a device such as a mobile phone or a temporary carry-in device, which has a short time of radiating radio waves, is used. You will ignore the effects. Therefore, when the state where the electric field intensity is too strong continues for a long time, the alarm indicator 9 is displayed.
Will warn the user.

Further, based on the sampling data of the electric field intensity digitizing section 4, the data collecting section 12 keeps calculating the criterion. If the new criterion calculation result> the old criterion calculation result, the new criterion calculation result is stored in
Save in.

When actually operating such a radio alarm device, the user searches for an eavesdropping radio in response to the alarm issued by the alarm display device 9, and if the eavesdropping radio device actually exists, the user operates the switch 13. The user selects to discard the data stored in the data collection unit 12. When the eavesdropping wireless device does not actually exist, if the switch 13 selects to update the database 5 with the data stored in the data collection unit 12, the probability of occurrence of false alarm can be reduced.

Embodiment 5 FIG. FIG. 7 is a flowchart showing a processing method for one frequency performed by the data collection unit 12 of the radio alarm device of the present invention. The frequency band to be amplified by the band amplifier 2 is set using the frequency control unit 3 (STEP 70).
By doing 1), a value obtained by digitizing the output of the band amplifier 2 by analog-to-digital conversion processing in the electric field intensity digitizing section 4 is obtained (STEP 702). If the acquired value of the electric field strength is larger than the record of the data collection unit 12 (YES in STEP 703), the value of the record is updated to a new acquired value (STEP 705), and if smaller (STEP 703 is NO), the acquired value is Is rejected and the process proceeds to the next process (STEP 704). According to the above procedure, the maximum value of the acquired data is stored in the record of the data collection unit 12.

When the user who judges that the probability of false alarm is too high in the use criterion is instructed to update the data by the switch 13 (YES in STEP 706), a fixed value is added to the recorded contents of the data collection unit 12. By adding (STEP 707) and writing the result in the database 5 (STEP 708), the criterion is updated.

When an eavesdropping radio is actually set up, the data collection unit 12 captures the strong electric field strength generated by the eavesdropping radio in a record, so that the collected data cannot be used as a criterion. Therefore, when the user who has confirmed the existence of the eavesdropping wireless device instructs data destruction by the switch 13 (YES in STEP 709), the storage area of the data collection unit 12 storing the record is initialized (STEP 71).
0), the acquired data is discarded and data is newly collected.

Embodiment 6 FIG. FIG. 8 is a flowchart showing a processing method for one frequency performed by the data collection unit 12 of the radio alarm device of the present invention. The frequency band to be amplified by the band amplifier 2 is set using the frequency control unit 3 (STEP 70).
1), a plurality of values obtained by digitizing the output of the band-pass amplifier 2 by processing such as analog and digital conversion in the electric field intensity digitizing section 4 are obtained (STEP 801).

By the way, the electric field strength is represented by voltage. As can be seen from the formula (energy) = (voltage) 2 / (resistance), the frequency distribution of the obtained values is as shown in FIG. In FIG. 9, a curve 14 is a frequency distribution curve for each electric field intensity, and a curve 15 is a frequency distribution curve for the square of the electric field intensity and the energy conversion value (the frequency distribution of the square of the electric field intensity). And the frequency distribution of the energy conversion values match). For this reason, it is desirable to perform the t-test based on the equation in FIG. 4 using the energy or the square of the acquired value that has a distribution close to the normal distribution, instead of the value of the electric field strength that does not follow the normal distribution. Based on this perspective,
Each of the obtained electric field strength values is squared (hereinafter this value is EI
AVRmax of EI is calculated using the equation of FIG. 4 (STEP 802). If the value obtained by returning the unit to the original voltage by calculating the square root of AVRmax is larger than the record of the data collection unit 12 (YES in STEP 803), the value of the record is changed to the new A
Update to the square root of VRmax (STEP805), and if smaller (STEP805)
If EP803 is NO), reject the calculation result and move to the next process (S
TEP804). By the above procedure, the record is continuously updated to the criterion based on the acquired value under the situation where the electric field is strong.

When the user who judges that the probability of false alarm is too high in the use criterion is instructed by the switch 13 to update data (YES in STEP 706), a fixed value is added to the recorded contents of the data collection unit 12. By adding (STEP 707) and writing the result in the database 5 (STEP 708), the criterion is updated.

Further, when an eavesdropping radio is actually set up, the data collection unit 12 takes in the strong electric field strength generated by the eavesdropping radio into a record, so that the collected data cannot be used as a criterion. Therefore, when the user who has confirmed the existence of the eavesdropping wireless device instructs data destruction by the switch 13 (YES in STEP 709), the storage area of the data collection unit 12 storing the record is initialized (STEP 71).
0), the acquired data is discarded and data is newly collected.

Embodiment 7 FIG. FIG. 10 is a flowchart for a single frequency band showing the method of accumulating the criteria for the database of the radio alarm device of the present invention. FIG. 11 shows a change in the electric field intensity at a certain frequency per day. Unlike the noise of passing vehicles, etc., which are rejected by the counter unit 7 of the first embodiment and the like, the radio waves emitted by facilities such as offices, substation facilities, broadcast waves, and the radio waves emitted by stationary eavesdropping radios and the like. The output does not change significantly during short time intervals. For this reason, there is no need to constantly perform processing to receive the signal in broadband and calculate the spectrum by fast Fourier exchange or to measure the electric field strength for each frequency band. In other words, even if the frequency is changed in order and the electric field strength of the same frequency is measured at a substantially constant interval (a fixed measurement time provided at regular intervals is referred to as a time packet hereinafter), the measurement becomes more practically problematic. There is no difference in the distribution of the results.

By taking advantage of this point, the electric field intensity is continuously measured for each time packet (STEP 1001), and the maximum value among the acquired data is stored in the database 5 as a criterion of the frequency (STEP 1002). The criteria for each frequency can be stored.

Embodiment 8 FIG. FIG. 12 is a flow chart for a single frequency band showing the method of accumulating the criteria for the database of the radio alarm device of the present invention. The required number of electric field strengths is measured (STEP 1201), and the process of calculating the AVRmax of the square of the acquired value EI using the equation of FIG. 4 is performed for each time packet (STEP 1202). Further, as shown in FIG. 11, since the strength of the electric field is constantly changing finely, in consideration of the fact that a device that adopts an acquired value when the electric field strength is small as a criterion causes only false reports, A which is the processing result of the measured value
The maximum value of VRmax is registered in the database 5 as a criterion (STEP1203).

Embodiment 9 FIG. FIG. 13 is a flowchart for a single frequency band, showing a method of accumulating the criteria for the database 5 of the radio alarm device of the present invention. The required number of electric field strengths is measured (STEP1201) to confirm whether there is a significant difference between the data groups acquired in the individual time packets (STEP130).
1). Especially when used wirelessly, b to e in FIG.
There is a clear superior difference between the electric field strength measurement result when there is a radio wave like the time packet No. and the electric field strength measurement result when there is a radio wave like the time packet a and f in FIG. For this reason, individual time packets are sorted into a group with a strong electric field strength and a group with a weak electric field strength by a significant difference test, and only the group with a strong electric field strength is left as a measured value (STEP1).
302) to increase the accuracy of the criterion. Using all the remaining data, the AVRmax of the square of the acquired value EI is calculated using the equation of FIG. 4 (STEP1303), and √AVRmax, which is the same unit system as the acquired data, is registered in the database 5 as a criterion ( STEP1304).

Embodiment 10 FIG. FIG. 14 is a flowchart for a single frequency band, showing a method for accumulating the criteria for the database 5 of the radio alarm device of the present invention. FIG.
It is a reference example showing the change of the electric field intensity on a day. In the case where the electric field strength changes daily as described above, FIG.
A using all the measurement data of the time packets a to f
When VRmax is calculated, AVRmax sometimes becomes large enough to be unpractical because the apparent variation looks large. Therefore, first, the required number of electric field intensities are measured (STEP 1201), and the time packets a to f in FIG. 15 are classified into a plurality of groups by a significant difference test (STEP 1301). Extract only data (S
(TEP1401) By calculating AVRmax (STEP1303), the value of AVRmax is reduced, and an increase in the electric field strength is easily detected. Finally, the same unit system as the acquired data
VRmax is registered in the database 5 as a criterion (S
TEP1304).

Embodiment 11 FIG. 16 is a flowchart showing an operation for one sweep in the frequency determination procedure of the frequency control unit 3 of the radio alarm device of the present invention. First, the lower limit frequency registered in the storage area of the frequency control unit 3 is given as the scheduled frequency to be set (STEP 160).
1). A list of frequencies for which monitoring processing registered in the frequency control unit 3 is not performed (hereinafter, referred to as skip) is searched,
If skip is not requested for the scheduled frequency (ST
By setting the preset frequency to the variable band amplifier 2 (STEP1603), the data of the electric field strength of the frequency is acquired. If skip is requested for the set scheduled frequency (YES in STEP 1602), a new value is obtained by adding (incrementing) a fixed value to the set scheduled frequency without performing any processing (STEP 1602).
EP1605). If the new scheduled frequency exceeds the upper limit frequency of the sweep range, one sweep is completed (STEP160).
6).

Embodiment 12 FIG. 17 is an external view showing an installation example of a radio alarm of the present invention. Reference numeral 16 denotes a ceiling, reference numeral 17 denotes a piezoelectric buzzer for auditory display, reference numeral 18 denotes a patrol lamp for visual display, and reference numeral 19 denotes a housing of a radio alarm having the piezoelectric buzzer 17 and the patrol lamp 18.
It should be noted that, other than the form of FIG. 17 hanging from the ceiling, the antenna unit 1 and the visual display unit 1
There are various embodiments according to the place of use, such as a form in which the radio wave alarm device 1 is integrated with the radio alarm device main body 19.

FIG. 18 is a circuit diagram for explaining the operation of the alarm display according to this embodiment. 20 is a relay for notifying the judgment result to the audiovisual display unit 11, 21 is a motor for rotating the patrol lamp,
Reference numeral 22 denotes a patrol lamp, and reference numeral 23 denotes a power supply of the audiovisual display unit 11. As a result of the information processing, when an alarm instruction is input to the audiovisual display section 11 by closing the relay 20, the piezoelectric buzzer 17 sounds, the patrol lamp 22 is turned on, and the motor 21 rotates.

Embodiment 13 FIG. 19 is an external view showing a display example of an audiovisual display section of a radio alarm according to the present invention. 2
Reference numeral 4 denotes a monitor as a display device for visual display for displaying the minimum information required for the user to search for the eavesdropping wireless device. A graph display unit for displaying the electric field strength measurement result, and a character information display unit 26 for displaying the parameters used for the judgment (the frequency at which an abnormality is detected, the electric field strength, and the criterion) as specific numerical values. As a method of displaying the electric field intensity and the determination standard, in addition to the method of displaying the electric field intensity itself, a voltage (unit V or the like) applied to the input terminal of the antenna unit 1 shown in FIG. The same operation and effect can be obtained even if the unit is replaced with an arbitrary unit system that is reversible with the electric field strength, such as a method of displaying the power (unit W or J) applied to the terminal and a method of displaying the square of the voltage (unit V2). it can.

Embodiment 14 FIG. FIG. 20 is a conceptual diagram showing a remote monitoring system using a public line of a radio alarm according to the present invention. In the figure, reference numeral 27 denotes an information terminal as a remote notification device such as a personal computer, and reference numeral 28 denotes an arbitrary public line such as a telephone line connecting the plurality of radio alarms 19 and the information terminal 27 or the Internet. The radio wave alarm 19 which has detected the abnormal electric field strength uses the public line 28 to inform the information terminal 27 located at the monitoring place that the abnormal electric field strength has been detected, the frequency at which the abnormality was detected, and the electric field strength at that time. Then, the results of the electric field strength measurement for five steps before and after the frequency at which the abnormality is detected, and information (telephone number, network address, identification number, etc.) for specifying the radio wave alarm device at which the abnormality is detected are notified.

[0065]

As described above, according to the present invention, the strength of the electric field strength is continuously measured based on the frequency distribution of the electric field strength in a state where there is no abnormal radio wave without collating with the indoor sound. In addition, it can be confirmed whether or not a change that satisfies the characteristics of the radio wave emitted by the stationary eavesdropping radio, in which the radio wave having a large output is continuously emitted for a long time, appears.

Therefore, since there is no need to demodulate into an audio signal, it is possible to determine the possibility of the presence of the eavesdropping radio regardless of the modulation method of the eavesdropping radio.

Further, since it is not necessary to acquire the pattern of the audio signal, the time for receiving a single frequency is as short as less than 1 second. Therefore, since the time required for one sweep is short, the frequency range that can be practically monitored is very wide.

Further, since the determination is made only by the received radio wave, the detection accuracy does not change due to the distance between the eavesdropping radio and the relative position of the pickup.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a radio alarm device of the present invention.

FIG. 2 is a formula showing a t-test technique for testing whether there is a significant difference between each mean of two statistical variate groups.

FIG. 3 is a block diagram showing another example of the radio wave alarm of the present invention.

FIG. 4 is a modified version of the formula in FIG. 2 so as to compare a judgment value with sampling data.

FIG. 5 is a block diagram showing another example of the radio wave alarm of the present invention.

FIG. 6 is a block diagram showing another example of the radio wave alarm of the present invention.

FIG. 7 is a flowchart illustrating a processing method for one frequency performed by the data collection unit of the radio wave alarm according to the present invention.

FIG. 8 is a flowchart illustrating a processing method for one frequency performed by the data collection unit of the radio wave alarm according to the present invention.

FIG. 9 is a diagram showing a frequency distribution of electric field intensity.

FIG. 10 is a flowchart for a single frequency band showing a method for accumulating the criteria for the database of the radio alarm device of the present invention.

FIG. 11 shows a change in electric field intensity at a certain frequency in one day.

FIG. 12 is a flowchart for a single frequency band, showing a method of accumulating a criterion for a database of a radio alarm device according to the present invention.

FIG. 13 is a flowchart for a single frequency band illustrating a method for accumulating the criteria for the database of the radio alarm device of the present invention.

FIG. 14 is a flowchart for a single frequency band, showing a method of accumulating a criterion in a database of a radio alarm device of the present invention.

FIG. 15 is a reference example showing a change in the electric field intensity in one day.

FIG. 16 is a flowchart showing an operation for one sweep in a frequency determination procedure of the frequency control unit of the radio alarm device of the present invention.

FIG. 17 is an external view showing an installation example of an audiovisual display unit of the radio alarm device of the present invention.

FIG. 18 is a circuit diagram for explaining the operation of the audiovisual display unit.

FIG. 19 is an external view showing a display example of an audiovisual display section of the radio alarm device of the present invention.

FIG. 20 is a conceptual diagram showing a remote monitoring system using a public line of the radio alarm device of the present invention.

FIG. 21 is a block diagram illustrating an eavesdropping wireless device detection device.

[Explanation of symbols]

1 antenna section, 2 variable band amplifier, 3 frequency control section, 4 electric field strength quantification section, 5 database, 6
t-test calculation unit, 7 counter unit, 8 comparison unit, 9 alarm display unit (alarm notification unit), 10 output unit, 11 audiovisual display unit (alarm notification unit), 12 data collection unit, 13 switch unit, 17 piezoelectric buzzer, 18. Patrol lamp (rotating light), 24 monitor (display device), 27 information terminal (remote notification device), 28 public line, 40 electric field strength digitizing unit by frequency band, 41 testing unit.

Continued on the front page (72) Inventor Yoshiharu Sato 6-28-1 Minamioi, Shinagawa-ku, Tokyo Central Within Chiyoda Co., Ltd. (72) Inventor Naotaka Miura 6-28-1 Minamioi, Shinagawa-ku, Tokyo Central Chiyoda stock Company F-term (reference) DA01 DA19 DA24 EA02 FA03 FA08 FA11 FA15 GA01 GA12 HA01 HA05 HA13 5K061 AA00 BB00 CC02 CC25 CC25 CC49 DD14 JJ07

Claims (22)

[Claims] An antenna unit for receiving a transmission signal transmitted from an eavesdropping radio and outputting a reception signal, and an electric field for each frequency band for quantifying the electric field strength of the reception signal output from the antenna unit for each band An intensity digitizing unit, a database for recording a predetermined criterion, and a test unit for determining the presence or absence of an abnormal radio wave based on the output of the electric field intensity quantifying unit for each frequency band and the criterion recorded in the database. And a warning display device for displaying the status of the determination by the test section. 2. The radio wave alarm according to claim 1, wherein the frequency band-based electric field strength digitizing section changes the frequency of the band sequentially at predetermined time intervals. 3. A counter unit for measuring a duration during which the result of the test unit determines that there is an abnormal radio wave, wherein the alarm display unit is configured to provide an eavesdropping radio when the value of the counter unit exceeds a predetermined value. The radio alarm according to claim 1 or 2, wherein the presence of the alarm is notified. 4. A data collection unit for creating update information of the database based on an output of the frequency band-based electric field strength quantification unit, and a switch unit for instructing disposal of data collected by the data collection unit. The radio wave alarm according to any one of claims 1 to 3, further comprising: operating the switch unit to discard or update the data stored in the data collection unit. 5. The test section compares the value of the electric field strength stored in the database with an offset value and the output of the electric field strength digitizing section for each frequency band, and stores the magnitude in the database. 5. An abnormal radio wave is detected when the output of the frequency band-based electric field intensity quantifying unit is larger than a value obtained by adding an offset value to the stored electric field intensity. The radio alarm described in Crab. 6. An average, a variance or an estimated section, and a maximum value of a reliability section obtained by squaring the output of the electric field strength digitizing section for each frequency band, and calculating this value and the electric field strength stored in the database. A comparison unit that compares the magnitude of the squared value of the magnitude with the average, variance or estimation interval, and the reliability interval; and the comparison unit calculates the output of the frequency band-based electric field intensity quantification unit. The radio wave alarm according to any one of claims 1 to 5, wherein when the set value is larger than the value stored in the database, an abnormal radio wave is detected. 7. A value obtained by calculating an average and a variance of an output of the electric field intensity quantifying unit for each frequency band, and calculating an average and a variance of a value obtained by squaring the electric field intensity stored in the database. When the t-test operation unit outputs that there is a significant difference between the value of the database and the output of the electric field strength quantification unit for each frequency band, The radio wave alarm according to any one of claims 1 to 6, wherein there is radio wave. 8. The comparing section compares the output of the frequency band-based electric field strength quantifying section with the minimum output value required for wireless transmission from indoors to outdoors, and the comparison section determines a result. 7. The radio alarm as claimed in claim 6, wherein, if negative, the determination of the significant difference is ignored and it is determined that there is no abnormal radio wave. 9. The method according to claim 4, wherein the magnitude of the electric field strength stored in the database is sampled a plurality of times at predetermined time intervals, and the largest data is adopted as a registered value. The radio alarm according to any one of the above. 10. The magnitude of the electric field strength stored in the database is sampled a plurality of times at predetermined time intervals, and the average value or the variance value or the reliability interval of the section where the average value of the acquired data is the largest. The radio wave alarm according to any one of claims 4 to 8, wherein a maximum value of the estimated section is adopted as a registered value. 11. The magnitude of the electric field strength stored in the database is obtained by sampling a plurality of data in a predetermined time unit, and calculating small data determined as not belonging to the same population from an average value for each time. The radio wave alarm according to any one of claims 4 to 8, wherein an average value or a variance value of the excluded data or a maximum value of the reliability section / estimation section is adopted as a registered value. 12. The magnitude of the electric field strength stored in the database is obtained by sampling a plurality of data in a predetermined time unit, and determining a large data determined as not belonging to the same population from an average value for each time. The radio wave alarm according to any one of claims 4 to 8, wherein an average value or a variance value of the excluded data or a maximum value of the reliability section / estimation section is adopted as a registered value. 13. The frequency band-based electric field strength quantifying section,
The radio wave alarm according to claim 1 or 2, wherein the detection processing is not performed on an arbitrary frequency among the plurality of frequencies. 14. The radio wave alarm according to claim 1, wherein the alarm display has a speaker or a rotating light as a means for alarming. 15. The alarm display device includes a display device for displaying a frequency, a received power or a received voltage, a determination criterion, and a determination result by character display, as means for notifying and warning the determination result. The radio wave alarm according to claim 1 or 2. 16. An output unit for notifying a judgment result and an alarm of the verification unit to a remote place using a public line or the like, and an alarm display device at the remote place notifies the presence or absence of an abnormal radio wave. Item 4. The radio wave alarm according to any one of Items 1 to 3. 17. The radio alarm device according to claim 1, wherein the alarm display device notifies the user of a frequency, a received power or a received voltage, a criterion, and a determination result regardless of the determination result. 18. The alarm display device, when it is determined that an unknown radio wave transmitted from the wiretap radio is present, notifies the frequency, the received power or the received voltage, the criterion, and the determination result of the radio wave. The radio wave alarm according to claim 1 or 2, wherein: 19. The alarm display device, when it is determined that an unknown radio wave transmitted from the eavesdropping radio exists, the frequency, reception power or reception voltage of a plurality of radio waves before and after the radio wave, a determination criterion, a determination result. The radio wave alarm according to claim 1 or 2, wherein the radio wave alarm is notified. 20. The radio alarm according to claim 1, wherein the alarm display includes, in the notification information, an identification name or a number of a device to be notified. 21. The radio alarm according to claim 1, wherein the alarm display includes, in the notification information, a telephone number to which a device to be notified is connected. 22. The radio alarm device according to claim 1, wherein the alarm display device includes, in the notification information, an address of a network to which the device to be notified is connected.