Signal processing device, radio, signal processing method, and signal processing program

Abstract

It can identify inappropriate wireless signals without analyzing the content of the wireless signals. [Solution] The signal processing device 20 comprises a receiving unit 21, an analysis unit 22, a display processing unit 23, and a determination unit 24. The receiving unit 21 receives radio waves D containing one or more radio signals M. The analysis unit 22 analyzes the signal strength Pw for each frequency f contained in the radio waves D. The display processing unit 23 performs display processing to display a spectral image V1 showing the correspondence between frequency f and signal strength Pw on a display device 27. The determination unit 24 determines, based on the correspondence between frequency f and signal strength Pw, whether the radio signal M containing a frequency f whose signal strength Pw is equal to or greater than a predetermined threshold Pw0 conforms to a predetermined standard. The display processing unit 23 adds at least one of a non-conformity indicator 41 indicating the frequency of a radio signal that does not conform to the standard, and a conformity indicator 43 indicating the frequency of a radio signal that conforms to the standard, to the spectral image V1.

Description

Technical Field

[0001] This invention relates to a signal processing apparatus, a radio, a signal processing method, and a signal processing program.

Background Art

[0002] Generally, in amateur radio, a regulatory agency or guidance agency is provided to monitor the usage status of radio waves, such as whether the radio waves being used deviate from the regulations of the law or whether a call sign is properly transmitted. The regulatory agency or guidance agency manually selects and receives a radio signal of a specific frequency using a radio communication device, and the content of the communication is directly confirmed by a monitor who is a user of the radio communication device. When an inappropriate radio signal (an illegal station) is discovered, a warning is sent to the communicator.

[0003] However, information on radio signals whose appropriateness has already been confirmed is not stored in the radio communication device and is thus left to the monitor's records and memory. There is a desire to store this information in the radio communication device itself and further display it together with the frequency spectrum to inform the user of the radio signal.

[0004] Techniques for displaying the content of a received signal together with the frequency spectrum are already known. For example, in Patent Document 1, a radio communication device is disclosed that displays the frequency spectrum on a display unit, analyzes the content of the received signal to extract identification information of the communication source or destination, and associates and displays the identification information and the frequency with the frequency spectrum.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, if a regulatory station or guidance station were to use the wireless communication device described in Patent Document 1, it would be difficult for an operator to determine the illegality of the radio waves solely from the relationship between the identification information analyzed by this wireless communication device and the frequency. Ultimately, confirmation by demodulated audio would be necessary. Therefore, it is desirable to provide the wireless communication device with a function to determine and display whether at least a part of the received signal is illegal, thereby assisting the operator's verification work. Furthermore, even if the content of the received signal is analyzed, in most cases, identification information cannot be extracted because it does not contain an identification signal, such as an analog-modulated audio signal. Therefore, it is desirable to be able to determine whether a wireless signal is appropriate or not without analyzing the wireless signal.

[0007] The present invention has been made in view of the above problems, and aims to provide a signal processing device, a radio device, a signal processing method, and a signal processing program that can determine an inappropriate radio signal without analyzing the content of the radio signal. [Means for solving the problem]

[0008] The signal processing device developed to solve the above problems comprises a receiving unit, an analysis unit, a display processing unit, and a determination unit. The receiving unit receives radio waves containing one or more radio signals. The analysis unit analyzes the signal strength for each frequency contained in the radio waves. The display processing unit performs display processing to display a spectral image showing the correspondence between the frequency and the signal strength on a display device. The determination unit determines, based on the correspondence between the frequency and the signal strength, whether a radio signal containing a frequency whose signal strength is above a predetermined strength conforms to a predetermined standard. The display processing unit adds at least one of the following to the spectral image: a non-conformity indicator showing a non-conformity frequency contained in a non-conformity radio signal determined by the determination unit to be non-conformity to the standard, and a conformity indicator showing a conformity frequency contained in a conformity radio signal determined by the determination unit to be conformity to the standard. In this way, the signal processing device determines non-conformity radio signals based on the correspondence between the frequency and signal strength of radio waves and displays the determination result on a display device. In other words, by determining whether or not a radio signal is non-compliant based solely on its frequency and signal strength, it is possible to identify non-compliant radio signals with simple processing without analyzing the content of the radio signal.

[0009] In the above-described signal processing device, it is preferable that the determination unit determines that a radio signal is a non-compliant radio signal if it includes a frequency in the frequency modulation band, which is the frequency band in which the transmission of radio signals modulated by frequency modulation is permitted, in which the signal strength fluctuates by more than a first fluctuation range, which is a predetermined fluctuation interval, during a first period, which is a predetermined time interval. In this way, by determining that a radio signal is non-compliant when the signal strength fluctuates by more than a predetermined fluctuation range at a predetermined frequency in the frequency modulation band, it becomes possible to identify radio signals that do not comply with the law. Therefore, it becomes easier to determine non-compliant radio signals in the frequency modulation band.

[0010] In the above-described signal processing device, it is preferable that the determination unit determines that a radio signal containing a frequency in a non-frequency modulation band other than the frequency modulation band, which is the frequency band in which the transmission of radio signals modulated by frequency modulation is permitted, is a non-compliant radio signal. This determination is made when the signal strength fluctuates within a predetermined range of variation during a second period that represents a predetermined time interval.

[0011] In the above-described signal processing device, it is preferable to further include a storage unit that stores a list of compliant frequencies. The determination unit preferably determines that the radio signal is a non-compliant radio signal if the frequency at which the signal strength is equal to or greater than a predetermined strength is other than the compliant frequency. In this way, since radio signals included in the compliant radio list are excluded from non-compliant radio signals, the load required for the determination process of non-compliant radio signals in the signal processing device can be reduced.

[0012] In the above signal processing device, the list preferably includes various statuses corresponding to the compliant frequency. The determination unit preferably determines the compliant radio signal based on the list. The display processing unit preferably displays status images indicating the various statuses on the display device. When status images are displayed in this way, detailed information about the compliant radio signal becomes easier for the user to understand, and it becomes less likely that they will mistakenly identify it as a non-compliant radio signal.

[0013] In the above signal processing device, it is preferable to further include a reception unit that receives user operations. It is preferable that the display processing unit switches the display of the status image on and off in response to the operations performed on the reception unit. This makes it possible to display the status image only when necessary for the user, simplifying the display of the display device and enabling the display of only the information desired by the user.

[0014] In the above-described signal processing device, it is preferable that the display processing unit adds a band division display indicating the usage of each frequency band to the spectral image. This allows the user to visually confirm the usage of each frequency band on the display device, thereby assisting the user's judgment in monitoring the radio wave usage status.

[0015] The wireless device developed to solve the above problems comprises the signal processing device, an antenna for detecting radio waves, and a display device for displaying images related to the radio waves. In this way, the wireless device determines an unsuitable wireless signal based on the correspondence between the frequency and signal strength of the radio waves and displays the determination result on the display device. In other words, by determining whether or not a signal is unsuitable based only on the frequency and signal strength of the radio waves, it is possible to determine an unsuitable wireless signal with simple processing without analyzing the content of the wireless signal.

[0016] The signal processing method developed to solve the above problems includes a receiving step, an analysis step, a display step, and a determination step. In the receiving step, a radio wave containing one or more radio signals is received. In the analysis step, the signal strength for each frequency contained in the radio wave is analyzed. In the display step, a spectral image showing the correspondence between the frequency and the signal strength is displayed. In the determination step, based on the correspondence between the frequency and the signal strength, it is determined whether a radio signal containing a frequency whose signal strength is above a predetermined strength conforms to a predetermined standard. In the display step, at least one of a non-conformity indicator showing a non-conformity frequency contained in a non-conformity radio signal determined to be non-conformity to the standard, and a conformity indicator showing a conformity frequency contained in a conformity radio signal determined to be conformity to the standard is added to the spectral image. In this way, the above signal processing method determines non-conformity radio signals based on the correspondence between the frequency and signal strength of the radio wave and displays the determination result on a display device. In other words, by determining whether or not a radio signal is non-conformity based only on the frequency and signal strength of the radio wave, non-conformity radio signals can be determined with simple processing without analyzing the content of the radio signal.

[0017] The signal processing program developed to solve the above problem causes a computer to perform a reception step, an analysis step, a display step, and a determination step. In the reception step, radio waves containing one or more radio signals are received. In the analysis step, the signal strength for each frequency contained in the radio waves is analyzed. In the display step, a spectral image showing the correspondence between the frequency and the signal strength is displayed. In the determination step, based on the correspondence between the frequency and the signal strength, it is determined whether or not a radio signal containing a frequency whose signal strength is above a predetermined strength conforms to a predetermined standard. In the display step, at least one of a non-conformity indicator showing a non-conformity frequency contained in a non-conformity radio signal determined to be non-conformity to the standard, and a conformity indicator showing a conformity frequency contained in a conformity radio signal determined to be conformity to the standard is added to the spectral image. In this way, the signal processing program determines non-conformity radio signals based on the correspondence between the frequency and signal strength of the radio waves and displays the determination result on a display device. In other words, by determining whether or not a radio signal is non-conformity based only on the frequency and signal strength of the radio waves, non-conformity radio signals can be determined with simple processing without analyzing the content of the radio signal. [Effects of the Invention]

[0018] According to the present invention, it is possible to determine an inappropriate wireless signal without analyzing the content of the wireless signal. [Brief explanation of the drawing]

[0019] [Figure 1] This shows a wireless device according to one embodiment of the present invention. [Figure 2] This shows a functional block diagram of a wireless device according to one embodiment of the present invention. [Figure 3] This shows an example of a spectral image displayed on a display device for a wireless device according to one embodiment of the present invention. [Figure 4] An example of a compliant wireless list according to one embodiment of the present invention is shown. [Figure 5]An example of a status image displayed on a display device according to an embodiment of the present invention is shown. [Figure 6] A flowchart of a signal processing method according to an embodiment of the present invention is shown. [Figure 7] A flowchart of a signal processing method according to an embodiment of the present invention is shown.

Embodiments for Carrying Out the Invention

[0020] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate. However, the present invention is not limited to the following embodiments.

[0021] FIG. 1 shows a radio device 1 according to an embodiment of the present invention. The radio device 1 is installed in a regulatory station or guidance station that monitors the usage status of radio waves, such as whether the radio waves used in an amateur radio that transmits and receives radio signals (radio waves) deviate from the regulations of the law or whether a call sign, etc. is properly transmitted. In an amateur radio, for example, radio waves in a frequency band from 144.00 [MHz] to 146.00 [MHz] (144 MHz band), or a frequency band from 430.00 [MHz] to 440.00 [MHz] (430 MHz band), etc. are used. In amateur radio, a radio signal modulated by a frequency modulation (FM: frequency modulation) method is mainly used. A radio signal modulated by the FM method is permitted to be used in a frequency band from 144.70 [MHz] to 145.65 [MHz] in the 144 MHz band, and in frequency bands from 431.40 [MHz] to 431.90 [MHz] and from 432.10 [MHz] to 434.00 [MHz] in the 430 MHz band.

[0022] The radio device 1 includes a communication device 2 and an antenna 4. The communication device 2 receives radio waves D via the antenna 4. The radio waves D include one or more radio signals W. The antenna 4 is connected to the communication device 2 by, for example, a coaxial cable 5. The antenna 4 detects the radio waves D and outputs them to the communication device 2 via the coaxial cable 5.

[0023] Figure 2 shows a functional block diagram of a wireless device 1 according to one embodiment of the present invention. The communication device 2 comprises a signal processing device 20 that processes radio waves D, a display device 27 that displays various images related to radio waves D and wireless signals W, an input operation unit 29 that receives input operations from the user of the communication device 2, and a storage unit 30 that stores various data and programs.

[0024] The signal processing device 20 includes a receiving unit 21 that receives radio waves D, an analysis unit 22 that performs frequency analysis on radio waves D, a display processing unit 23 that performs display processing to display the analysis results of the analysis unit 22 on a display device 27, a determination unit 24 that determines whether the radio signal W contained in the radio waves D conforms to the law, and a receiving unit 25 that receives input operations input to the input operation unit 29. The law is an example of a predetermined standard that the radio signal W must satisfy. The signal processing device 20 includes a processor such as a CPU (Central Processing Unit) and controls the display device 27 and the input operation unit 29. The storage unit 30 includes a storage device such as a hard disk drive (HDD). The signal processing device 20 functions as the receiving unit 21, analysis unit 22, display processing unit 23, and determination unit 24 by reading and executing the signal processing program in the storage unit 30. In the communication device 2, the storage unit 30 is provided outside the signal processing device 20, but the signal processing device 20 may be provided inside the signal processing device 20. In this case, the signal processing device 20 includes a storage unit 30 as a memory element such as a semiconductor memory.

[0025] The receiving unit 21 receives radio waves D via the antenna 4 and coaxial cable 5. The receiving unit 21 outputs the received radio waves D to the analysis unit 22.

[0026] The analysis unit 22 performs frequency analysis of the radio wave D received from the receiving unit 21 and analyzes the signal strength Pw for each frequency f contained in the radio wave D. For example, the analysis unit 22 is formed by an analog-to-digital converter (ADC) 91, a mixer 92, a local oscillator circuit 93, a low-pass filter 94, a downsampling circuit 95, a memory 96, and an FFT circuit 97. The analog-to-digital converter (ADC) 91 converts the radio wave D into a digital signal Wd at a sampling frequency fs. The mixer 92 mixes the digital signal Wd with the oscillation signal from the local oscillator circuit 93 to convert it into an intermediate frequency signal Wc, which is then output to the downsampling circuit 95 through the low-pass filter 94. By passing through the low-pass filter 94, aliasing noise is removed from the intermediate frequency signal Wc. The downsampling circuit 95 periodically decimates the data from the intermediate frequency signal Wc that has passed through the low-pass filter 94 by 1 / n and temporarily stores it in the first-in, first-out memory 96. The FFT circuit 97 reads the intermediate frequency signal Wc from the memory 96 in predetermined time window lengths T and performs a Fast Fourier Transform on each portion. As a result, the intermediate frequency signal Wc is decomposed into its own frequency f components.

[0027] Furthermore, if the frequency of the input signal is low, frequency conversion by the mixer 92 may be omitted. Also, if the amount of data is small, the data may be input directly from the downsampling circuit 95 to the FFT circuit 97 without using the memory 96. The oscillator circuit 90 and local oscillator circuit 93 that operate the analog / digital conversion circuit 91 at the sampling frequency fs oscillate based on a signal of frequency f0 from the reference oscillator circuit 99.

[0028] The display processing unit 23 generates a spectral image V1 showing the correspondence between frequency f and signal strength Pw contained in the radio wave D, based on the analysis results of the analysis unit 22. Figure 3 shows an example of the spectral image V1 displayed on the display device 27 of the radio 1. Specifically, the display processing unit 23 acquires spectral information J1 showing the signal strength Pw for each frequency f of the intermediate frequency signal Wc, which is the conversion result of the FFT circuit 97. Based on the acquired spectral information J1, the display processing unit 23 generates a spectral display V11 showing frequency f on the horizontal axis and signal strength Pw on the vertical axis. The spectral display V11 in Figure 3 shows, as an example, the signal strength in the frequency range from 430.00 [MHz] to 438.00 [MHz] within the 430 MHz band.

[0029] Furthermore, the display processing unit 23 generates a waterfall display V12 based on the acquired spectral information J1, showing frequency f on the horizontal axis and signal intensity Pw in color. As the display processing unit 23 sequentially generates and updates the waterfall display V12, the time change of signal intensity Pw for each frequency f is shown as the vertical axis of the waterfall display V12. The waterfall display V12 in Figure 3 corresponds to the spectral display V11.

[0030] For example, the display processing unit 23 generates a spectral image V1 by arranging the generated spectral display V11 and waterfall display V12 vertically and displays it on the display device 27. The display device 27 includes, for example, a liquid crystal display or an organic EL display.

[0031] Note that spectral image V1 may contain only one of either spectral display V11 or waterfall display V12.

[0032] Furthermore, the spectral image V1 includes a band division display V13 that indicates the usage of each frequency band. In the signal processing device 20, the storage unit 30 stores band division information that indicates the usage of, for example, the 430 MHz band. The display processing unit 23 refers to the band division information in the storage unit 30 and generates a band division display V13 that arranges the displays indicating the usage of each frequency band in order from low frequency band to high frequency band, and places and adds it between the spectral display V11 and the waterfall display V12 in the spectral image V1. As a result, the user of the communication device 2 can visually confirm the usage of each frequency band on the display device 27, thereby assisting the user's judgment in monitoring the radio wave usage status.

[0033] [Judgment in FM band: Non-compliant] For example, if the radio wave D received by the receiving unit 21 includes a frequency f1 (Figure 3) with a signal strength Pw of threshold Pw0 or higher, the determination unit 24 determines whether the radio signal W1 including frequency f1 conforms to the law.

[0034] Specifically, the determination unit 24 refers to the spectral information J1, which is the analysis result of the analysis unit 22, and when it detects a frequency f1 in the spectral information J1 that has a signal intensity Pw1 of threshold Pw0 or higher, it acquires the signal intensity Pw1 of frequency f1. After detecting a signal intensity Pw1 of threshold Pw0 or higher at frequency f1, the determination unit 24 continues to acquire the signal intensity Pw1 of frequency f1 from the spectral information J1 for a predetermined period t1 (for example, 1 second).

[0035] Furthermore, the determination unit 24 identifies the frequency band to which frequency f1 belongs. The determination unit 24 identifies the frequency band to which frequency f1 belongs by referring to the band classification information in the storage unit 30. In this embodiment, frequency f1 is assumed to belong to the repeater band (434.00 [MHz] to 435.00 [MHz]). The repeater band is an example of a frequency modulation band (hereinafter referred to as the FM band) R1 to which the transmission of radio signals modulated using the FM method is permitted. In addition to the repeater band, the FM band R1 in the 430 MHz band includes the frequency bands of 431.40 [MHz] to 431.90 [MHz] and 432.10 [MHz] to 434.00 [MHz].

[0036] The determination unit 24 holds the acquired signal strength Pw1 for the period t1 and extracts the maximum value Pw11 and minimum value Pw12 of the signal strength Pw1 during the period t1. The determination unit 24 calculates the difference M1 between the maximum value Pw11 and the minimum value Pw12. The determination unit 24 compares the calculated difference M1 with a predetermined fluctuation range r1. The fluctuation range r1 may be a fixed value or a predetermined percentage (%) of the maximum value Pw11 or the minimum value Pw12. If the frequency f1 belongs to the FM band R1 and the difference M1 is greater than the fluctuation range r1, the determination unit 24 determines that the radio signal W1 containing the frequency f1 is non-compliant with the law. In other words, the determination unit 24 determines that a radio signal W1 containing a frequency f1 in which the signal strength Pw1 fluctuates by more than the fluctuation range r1 during the period t1 in the FM band R1 where the transmission of radio signals modulated in the FM method is permitted is a non-compliant radio signal.

[0037] Generally, non-compliant radio signals are often used in radio communications between truck vehicles by transportation companies, etc. (hereinafter referred to as "truck radio"). Because truck radio transmits and receives radio signals modulated using the FM method while moving, the fluctuations in signal strength are larger compared to radio communications by fixed base stations. Therefore, by determining that a signal is non-compliant when the signal strength fluctuates beyond a predetermined range at a predetermined frequency in the FM band, it becomes possible to identify truck radios that do not comply with the law. Thus, it becomes easier to identify non-compliant radio signals in the FM band.

[0038] [Judgment in FM band: Compliant] On the other hand, if the receiving unit 21 detects that the received radio wave D includes a frequency f2 (Figure 3) with a signal strength Pw equal to or greater than the threshold Pw0, the determination unit 24 refers to the band classification information to identify the frequency band to which frequency f2 belongs. In this embodiment, frequency f2 is assumed to belong to the FM band R1 (repeater band).

[0039] Similar to the determination for frequency f1, the determination unit 24 detects a signal strength Pw2 at frequency f2 that is equal to or greater than the threshold Pw0, and then continues to acquire the signal strength Pw2 of frequency f2 from the spectral information J1 for a predetermined period t1 (for example, 1 second). In this embodiment, it is assumed that the signal strength Pw2 at frequency f2 is approximately constant during period t1, and the difference between the maximum and minimum values ​​is approximately zero. If frequency f2 belongs to the FM band R1 (repeater band) and the difference M1 is less than or equal to the fluctuation range r1, the determination unit 24 determines that the radio signal W2 including frequency f2 conforms to the law. In other words, the determination unit 24 determines that a radio signal W2 including frequency f2 in which the signal strength Pw2 fluctuates within a fluctuation range r1 during period t1 is a compliant radio signal in the FM band where the transmission of radio signals modulated in the FM method is permitted is a compliant radio signal.

[0040] [Judgment outside the FM band: Non-compliant] For example, if the radio wave D received by the receiving unit 21 includes a frequency f3 (Figure 3) with a signal strength Pw of threshold Pw0 or higher, the determination unit 24 determines whether the radio signal W3 including frequency f3 conforms to the law.

[0041] The determination unit 24 refers to the spectral information J1, which is the analysis result of the analysis unit 22, and when it detects a frequency f3 in the spectral information J1 that has a signal strength Pw3 of threshold Pw0 or higher, it acquires the signal strength Pw3 at frequency f3. After detecting a signal strength Pw3 of threshold Pw0 or higher at frequency f3, the determination unit 24 continues to acquire the signal strength Pw3 at frequency f3 from the spectral information J1 for a predetermined period t2 (for example, 2 seconds).

[0042] Furthermore, the determination unit 24 identifies the frequency band to which frequency f3 belongs. The determination unit 24 identifies the frequency band to which frequency f3 belongs by referring to the band classification information. In this embodiment, frequency f3 is assumed to belong to the CW (Continuous Wave) band (430.00 [MHz] to 431.01 [MHz]). The CW band is a frequency band permitted for CW communication, which is communication performed by a combination of transmitting and stopping a radio signal W having a predetermined signal strength Pw. In other words, the CW band is a frequency band in which the transmission of radio signals modulated using the FM method is prohibited, and is an example of a non-frequency modulation band (non-FM band) R2 excluding the FM band R1 within the 430 MHz band.

[0043] The determination unit 24 holds the acquired signal strength Pw3 during period t2 and extracts the maximum value Pw31 and minimum value Pw32 of the signal strength Pw3 during period t2. The determination unit 24 calculates the difference M2 between the maximum value Pw11 and the minimum value Pw12. The determination unit 24 compares the calculated difference M2 with a predetermined fluctuation range r2. The fluctuation range r2 may be a fixed value or a predetermined percentage of the maximum value Pw31 or the minimum value Pw32. Typically, the fluctuation range r2 is the difference between the signal strength Pw4 of the radio signal W4 (Figure 3) used in CW communication and the threshold Pw0.

[0044] If the frequency f3 belongs to the non-FM band R2 and the difference M2 is less than or equal to the fluctuation range r2, the determination unit 24 determines that the radio signal W3 including the frequency f3 is non-compliant with the law. In other words, the determination unit 24 determines that a radio signal W3 including a frequency f3 in the non-FM band R2 other than the FM band where the transmission of radio signals modulated in the FM method is permitted is a non-compliant radio signal if the signal strength Pw3 fluctuates within a fluctuation range r2 during the period t2.

[0045] In the case of FM modulation, a radio signal with a nearly constant signal strength is continuously transmitted for a predetermined period. Therefore, compared to CW communication, where the transmission and stopping of the radio signal are repeated for a predetermined period, the fluctuation range of the signal strength is smaller. Consequently, by determining that a radio signal is non-compliant when the signal strength fluctuates within a predetermined range at a predetermined frequency in the non-FM band, it becomes possible to identify the above-mentioned truck radio signals that do not comply with the law. Thus, it becomes easier to identify non-compliant radio signals in the non-FM band.

[0046] [Judgment outside the FM band: Compliant] On the other hand, if the receiving unit 21 detects that the received radio wave D includes a frequency f4 (Figure 3) with a signal strength Pw equal to or greater than the threshold Pw0, the determination unit 24 refers to the band classification information to identify the frequency band to which frequency f4 belongs. In this embodiment, frequency f4 is assumed to belong to the non-FM band R2 (CW band).

[0047] Similar to the determination for frequency f3, the determination unit 24 detects a signal strength Pw4 at frequency f4 that is equal to or greater than the threshold Pw0, and then continues to acquire the signal strength Pw4 of frequency f4 from the spectral information J1 for a predetermined period t2 (for example, 2 seconds). In this embodiment, since the radio signal W4 including frequency f4 is used for CW communication, the maximum value of signal strength Pw4 is constant, and the minimum value of signal strength Pw4 is zero. In other words, the difference M2 between the maximum and minimum values ​​of signal strength Pw4 is the maximum value of signal strength Pw4. Therefore, the maximum value of signal strength Pw4, which is the difference M2 between the maximum and minimum values ​​of signal strength Pw4, is greater than the difference between signal strength Pw4, which is a typical fluctuation range r2, and the threshold Pw0. In other words, signal strength Pw4 fluctuates beyond the fluctuation range r2. Therefore, if frequency f4 belongs to the non-FM band R2 (CW band) and the difference M2 is greater than the fluctuation range r2, the determination unit 24 determines that the radio signal W4 including frequency f4 conforms to the law. In other words, the determination unit 24 determines that a radio signal W4 is a compliant radio signal if it includes a frequency f4 in which the signal strength Pw4 fluctuates by more than the fluctuation range r2 during the period t2, in a non-FM band R2 other than the FM band in which the transmission of radio signals modulated in the FM method is permitted.

[0048] [Displaying the judgment results] When the determination unit 24 determines whether the radio signal W contained in the received radio wave D is a compliant radio signal or a non-compliant radio signal, the display processing unit 23 adds the determination result of the determination unit 24 to the spectral image V1 and displays it on the display device 27.

[0049] For example, the display processing unit 23 generates a non-conformity indicator 41A that indicates the frequency f1 included in the radio signal W1 which has been determined to be a non-conformity radio signal, based on the determination result of the determination unit 24. As shown in Figure 3, the non-conformity indicator 41A is a mark having a predetermined shape (e.g., a triangle) and a predetermined color (e.g., yellow). The non-conformity indicator 41A may have a shape other than a triangle, or a color other than yellow. Furthermore, the non-conformity indicator 41A may be a predetermined character or symbol.

[0050] The display processing unit 23 places the generated non-conformity display 41A at a position corresponding to frequency f1 in the spectral image V1. For example, the non-conformity display 41A is placed in the spectral image V1 between the spectral display V11 and the waterfall display V12, at a position corresponding to frequency f1 in the horizontal axis direction. However, the position in which the non-conformity display 41 is placed is not limited to the above.

[0051] Similarly, the display processing unit 23 generates a non-conformity display 41B that indicates the frequency f3 included in the radio signal W3 which has been determined to be a non-conformity radio signal, and places it in the spectral image V1 at the position corresponding to the frequency f3.

[0052] As described above, in the signal processing device of this embodiment, non-compliant radio signals are determined based on the correspondence between radio wave frequency and signal strength, and the determination result is displayed on the display device. In this way, by determining whether or not a signal is non-compliant based only on the radio wave frequency and signal strength, non-compliant radio signals can be determined with simple processing without analyzing the content of the radio signal.

[0053] In this embodiment, a display different from the non-conformity displays 41A and 41B may be displayed on the display device 27 depending on the input operation input to the input operation unit 29. Specifically, the regulatory station or guidance station issues a warning to the sender or receiver of the non-conformity radio signal. The communication device 2 displays the non-conformity radio signal for which the regulatory station or guidance station has issued a warning on the display device 27.

[0054] For example, the user of communication device 2 inputs a selection operation to the input operation unit 29 to select the non-compliant radio signal that issued the warning. The input operation unit 29 is typically a switch composed of physical keys or a dial. The input operation unit 29 may also be a touch panel formed integrally with a liquid crystal display or an organic EL display.

[0055] For example, when a selection operation to select the non-conformity display 41B displayed on the display device 27 is input to the input operation unit 29, the reception unit 25 (Figure 2) accepts the selection operation from the input operation unit 29. When the reception unit 25 accepts the selection operation, the display processing unit 23 changes the non-conformity display 41B to a warning display 42 according to the content of the selection operation. Specifically, the display processing unit 23 generates a warning display 42 in which at least one of the shape and color tone of the non-conformity display 41B is changed, and places it in the spectral image V1 in place of the non-conformity display 41B. In Figure 3, the warning display 42 differs from the non-conformity display 41B only in color tone. In Figure 3, the difference in color tone is shown by the type of hatching.

[0056] Furthermore, the display processing unit 23 generates a conformity indicator 43 that shows the frequencies f2 and f4 included in the radio signals W2 and W4, respectively, which have been determined to be conformity radio signals, based on the determination result of the determination unit 24. As shown in Figure 3, the conformity indicator 43 is the same mark as the non-conformity indicators 41A, 41B, or the warning indicator 42, and differs only in its color tone from the non-conformity indicators 41A, 41B, or the warning indicator 42.

[0057] The display processing unit 23 places the generated adapted display 43 at the position corresponding to frequency f2 or frequency f4 in the spectral image V1, respectively.

[0058] In this embodiment, a compliant radio list J2, which shows a list of correspondences between non-compliant or compliant radio signals determined by the determination unit 24 and frequency f, may be stored in the storage unit 30. Figure 4 shows an example of a compliant radio list J2.

[0059] For example, the display processing unit 23, based on the determination result of the determination unit 24, associates the frequency f with either a non-compliant or compliant radio signal and adds it to the compliant radio list J2, thereby generating or updating the compliant radio list J2. In the compliant radio list J2, non-compliant radio signals may be further distinguished from non-compliant radio signals that have already been warned about. In this case, the display processing unit 23 updates the compliant radio list J2 according to the selection operation on the input operation unit 29.

[0060] Specifically, the display processing unit 23 associates frequency f1 (434.70 [MHz]) with "Non-compliant," which indicates a non-compliant radio signal, and adds it to the compliant radio list J2. Similarly, the display processing unit 23 associates frequency f2 (434.20 [MHz]) with "Compliant," which indicates a compliant radio signal, and adds it to the compliant radio list J2. After the display processing unit 23 associates frequency f3 (430.60 [MHz]) with "Non-compliant," which indicates a non-compliant radio signal, and adds it to the compliant radio list J2, it updates "Non-compliant" to "Warned" according to the selection operation on the input operation unit 29. The display processing unit 23 associates frequency f4 (430.50 [MHz]) with "Compliant," which indicates a compliant radio signal, and adds it to the compliant radio list J2.

[0061] The compliant radio list J2 may further include various status information corresponding to frequency f. For example, the status information may indicate the station name of a base station or relay station of a radio signal, or the type of known noise. As an example, the status information (station name) corresponding to frequency f3 (430.60 [MHz]) is "Station A". The status information (type of noise) corresponding to the frequency 436.00 [MHz] is "Voice".

[0062] The correspondence between frequency f and status information may be stored in the storage unit 30 as a compliant radio list J2 before the determination unit 24 makes its determination. In this case, the determination unit 24 may determine the compliant radio signal based on the compliant radio list J2.

[0063] Specifically, when the receiving unit 21 receives radio waves D, the determination unit 24 obtains the analysis results from the analysis unit 22 and compares the analysis results from the analysis unit 22 with the compliant radio list J2. For example, if the determination unit 24 finds that the frequency fa in the analysis results from the analysis unit 22 has a signal strength Pw of threshold Pw0 or higher and matches the frequency f2 corresponding to a compliant radio signal included in the compliant radio list J2, the determination unit 24 determines that the radio signal W containing frequency fa is a compliant radio signal.

[0064] On the other hand, the determination unit 24 determines that if the frequency fa with a signal strength Pw equal to or greater than the threshold Pw0 among the analysis results of the analysis unit 22 does not match the frequency f2 corresponding to a compliant radio signal included in the compliant radio list J2, then the radio signal W containing frequency fa is a non-compliant radio signal. In this way, radio signals included in the compliant radio list are excluded from non-compliant radio signals, thus reducing the load required for the non-compliant radio signal determination process in the signal processing device.

[0065] The display processing unit 23 generates a conformance indicator 43 or a non-conformance indicator 41 indicating the frequency fa based on the determination result of the determination unit 24 and adds it to the spectral image V1. For example, if the radio signal W containing the frequency fa is a conformance radio signal, the display processing unit 23 may display a status image V14 indicating various statuses of the corresponding conformance radio signal on the display device 27 along with the conformance indicator 43. Figure 5 shows an example of a status image V14 displayed on the display device 27. Figure 5 shows a status image V14 displayed on the display device 27 together with the spectral image V1 of Figure 3.

[0066] Specifically, the display processing unit 23 refers to the compliant radio list J2 and obtains the frequency f2, which is a compliant radio signal, and the status information "Station A" corresponding to frequency f2. The display processing unit 23 generates a status image V14 showing the obtained frequency f2 and status information "Station A", and displays it superimposed on the spectrum image V1. More specifically, the display processing unit 23 places the generated status image V14 at the position corresponding to frequency f2 in the spectrum image V1. In addition to being superimposed on the spectrum image V1, the status image V14 may also be displayed separately from the spectrum image V1 on the display device 27. When the status image V14 is displayed in this way, detailed information about the compliant radio signal becomes easier for the user of the communication device 2 to understand, and it becomes less likely that they will mistakenly identify it as an uncompliant radio signal.

[0067] For example, the display processing unit 23 may switch the display of the status image V14 on and off in response to an input operation input to the input operation unit 29. Specifically, when the status image V14 is displayed on the display device 27, if an operation to select the status image V14 or the conformance display 43 on the display device 27 is input to the input operation unit 29, the reception unit 25 (Figure 2) accepts the operation to the input operation unit 29. When the reception unit 25 accepts the operation to select the status image V14 or the conformance display 43, the display processing unit 23 switches the status image V14 on the display device 27 to be hidden according to the content of the operation. On the other hand, when the status image V14 is hidden on the display device 27, if an operation to select the conformance display 43 on the display device 27 is input to the input operation unit 29, the reception unit 25 (Figure 2) accepts the operation to the input operation unit 29. When the reception unit 25 accepts the operation to select the conformance display 43, the status image V14 is displayed on the spectral image V1. This allows the status image V14 to be displayed only when needed by the user of communication device 2, simplifying the display of the spectrum image V1 and enabling the display of only the information desired by the user.

[0068] Figures 6 and 7 show flowcharts of a signal processing method according to one embodiment of the present invention. Figure 7 is a continuation of Figure 6.

[0069] First, the communication device 2 receives radio waves D containing one or more radio signals W via the antenna 4 (step S11: reception step).

[0070] The communication device 2 performs frequency analysis of the received radio wave D and analyzes the signal strength Pw for each frequency f contained in the radio wave D (Step S12: Analysis step).

[0071] Based on the results of the frequency analysis, the communication device 2 generates a spectral image V1 showing the correspondence between the frequency f and signal strength Pw contained in the radio wave D, and displays it on the display device 27 (step S13: display step).

[0072] The communication device 2 determines whether the signal strength Pw is greater than or equal to the threshold Pw0 for each frequency f included in the radio wave D (step S14). If the signal strength Pw is less than the threshold Pw0 for any frequency included in the radio wave D (NO in step S14), the communication device 2 waits for the reception of a different radio wave D (step S11).

[0073] On the other hand, if the signal strength Pw at a specific frequency f is greater than or equal to the threshold Pw0 (YES in step S14), the communication device 2 compares the specific frequency f with the compliant radio list J2, which shows a list of compliant radio signals that comply with the law (step S15).

[0074] If the communication device 2 finds that a specific frequency f matches the frequency of a compliant radio signal included in the compliant radio list J2 (YES in step S15), it adds a compliance indicator 43 to the spectral image V1 (step S16). The communication device 2 then waits for the reception of a different radio wave D (step S11).

[0075] On the other hand, if a specific frequency f does not match the frequency of a compliant radio signal included in the compliant radio list J2 (NO in step S15), the communication device 2 identifies the frequency band to which the specific frequency f belongs (step S17).

[0076] If a specific frequency f belongs to the frequency modulation band (FM band) R1 (YES in step S17), the communication device 2 compares the difference M1 between the maximum value Pw11 and the minimum value Pw12 of the signal strength Pw1 during period t1 with a predetermined fluctuation range r1 (step S18).

[0077] On the other hand, if a particular frequency f belongs to a non-frequency modulation band (non-FM band) R2 other than the frequency modulation band (FM band) R1 (NO in step S17), the communication device 2 compares the difference M2 between the maximum value Pw31 and the minimum value Pw32 of the signal strength Pw3 during period t2 with a predetermined fluctuation range r2 (step S19).

[0078] If the difference M1 is less than or equal to the fluctuation range r1 (NO in step S18), or if the difference M2 is greater than or equal to the fluctuation range r2 (NO in step S19), the communication device 2 determines that the radio signal M containing a specific frequency f is a compliant radio signal (step S20). The communication device 2 adds the frequency f corresponding to the radio signal M that it determined to be a compliant radio signal to the compliant radio list J2 and updates it (step S21). The process proceeds to step S15.

[0079] On the other hand, if the difference M1 is greater than the fluctuation range r1 (YES in step S18), or if the difference M2 is less than the fluctuation range r2 (YES in step S19), the communication device 2 determines that the radio signal M containing a specific frequency f is an incompatible radio signal (step S22).

[0080] If the communication device 2 has issued a warning to the sender and receiver of radio signal M, which has been determined to be an incompatible radio signal (YES in step S23), the communication device 2 adds a warning indicator 42 to the spectral image V1 in response to the user's input (step S24). The communication device 2 then waits for the reception of a different radio wave D (step S11).

[0081] Conversely, if no warning has been issued to the sender or receiver of the radio signal M, which has been determined to be an incompatible radio signal (NO in step S23), the communication device 2 adds an incompatible indication 41 to the spectral image V1 (step S25). The communication device 2 then waits for the reception of a different radio wave D (step S11).

[0082] In the signal processing method of this embodiment, the processing from step S14 to step S22 constitutes a "determination step".

[0083] In this embodiment, as shown in Figure 3, an undetermined indicator 44 or a noise indicator 45 may be further added to the spectral image V1. The undetermined indicator 44 and the noise indicator 45 are marks similar to the non-conformity indicator 41, the warned indicator 42, or the conformity indicator 43, differing only in their color tone. For example, the display processing unit 23 of the signal processing device 20 places the undetermined indicator 44 on the spectral image V1 before the determination processing by the determination unit 24. Also, if it has been determined that a specific frequency f included in the radio wave D is a noise component or a spurious component, the display processing unit 23 places the noise indicator 45 on the spectral image V1. In this case, the fact that a specific frequency f is a noise component or a spurious component is included as status information in, for example, the conformity radio list J2.

[0084] Furthermore, the display processing unit 23 may, after adding the non-conformity display 41, warning display 42, conformity display 43, undetermined display 44, or noise display 45 to the spectral image V1 and a predetermined time has elapsed, delete the non-conformity display 41, warning display 42, conformity display 43, undetermined display 44, or noise display 45 from the spectral image V1. For example, if the frequency analysis by the analysis unit 22 shows that no signal intensity Pw above the threshold Pw0 is measured for a predetermined period, the display processing unit 23 deletes the non-conformity display 41, warning display 42, conformity display 43, undetermined display 44, or noise display 45 from the spectral image V1.

[0085] In this embodiment, the determination and display processing for the 430MHz band of the communication device 2 was explained as a representative example using Figures 3 and 5. However, the invention is not limited to this, and similar processing to the determination and display processing for the 430MHz band may be performed for the 144MHz band and other frequency bands as well.

[0086] In this embodiment, the signal processing device 20, the display device 27, and the input operation unit 29 are configured as a single device called the communication device 2, but the signal processing device 20, the display device 27, and the input operation unit 29 may each be configured as different devices.

[0087] In this embodiment, periods t1 and t2 are set to be different time intervals, but periods t1 and t2 may be the same time interval.

[0088] As described above, the wireless device of the present invention is not limited to the embodiments described above, and can be implemented in various forms without departing from the spirit of the invention. Furthermore, the multiple components disclosed in the above embodiments can be modified as appropriate. For example, some components from all the components shown in one embodiment may be added to the components of another embodiment, or some components from all the components shown in one embodiment may be deleted from the embodiment.

[0089] Furthermore, the drawings schematically show each component in order to facilitate understanding of the invention, and the thickness, length, number, spacing, etc. of each component shown may differ from the actual dimensions due to the convenience of drawing creation. Also, the configuration of each component shown in the above embodiments is merely an example and is not particularly limiting, and it goes without saying that various modifications are possible without substantially departing from the effects of the present invention. [Explanation of Symbols]

[0090] 1: Radio 2: Communication device 4: Antenna 20: Signal Processing Equipment 21: Receiving section 22:Analysis Department 23: Display Processing Unit 24: Judgment section 25: Reception Department 27:Display device 30: Storage section 41: Nonconformity indication 41A: Nonconformity indication 41B: Nonconformity indication 42: Warning displayed 43: Compatibility indication D: Radio wave J2: Compatible Wireless List M: Wireless signal Pw, Pw1, Pw2, Pw3, Pw4: Signal strength Pw0: Threshold R1: FM band (frequency modulation band) R2: Non-FM band (non-frequency modulation band) V1: Spectral image V13: Bandwidth Classification Display V14: Status Image W, W1, W2, W3, W4: Wireless signal f, f0, f1, f2, f3, f4, fa: frequency r1: Fluctuation range (first fluctuation range) r2: Fluctuation range (second fluctuation range) t1: Period (First Period) t2: Period (Second Period)

Claims

1. A receiving unit that receives radio waves containing one or more wireless signals, An analysis unit that analyzes the signal strength for each frequency contained in the aforementioned radio waves, A display processing unit that performs display processing to display a spectral image showing the correspondence between the frequency and the signal intensity on a display device, A determination unit determines whether a wireless signal including the frequency whose signal strength is equal to or greater than a predetermined strength conforms to a predetermined standard, based on the correspondence between the frequency and the signal strength. Equipped with, The display processing unit adds to the spectral image at least one of a non-conformity display indicating a non-conformity frequency included in a non-conformity radio signal determined by the determination unit to be non-conformity to the standard, and a conformity display indicating a conformity frequency included in a conformity radio signal determined by the determination unit to be conformity to the standard.

2. The signal processing apparatus according to claim 1, wherein the determination unit determines that a radio signal including a frequency in which the signal strength fluctuates by more than a first fluctuation range, which indicates a predetermined fluctuation interval, in a frequency modulation band, which is a frequency band in which the transmission of a radio signal modulated by a frequency modulation scheme is permitted, is an unsuitable radio signal.

3. The signal processing apparatus according to claim 1 or 2, wherein the determination unit determines that a radio signal including a frequency in a non-frequency modulation band other than the frequency modulation band, which is the frequency band in which the transmission of a radio signal modulated by a frequency modulation scheme is permitted, is a non-conforming radio signal, wherein the signal strength fluctuates within a second fluctuation range indicating a predetermined fluctuation interval during a second period indicating a predetermined time interval.

4. The system further includes a storage unit that stores a list of suitable frequencies, The signal processing apparatus according to claim 1, wherein the determination unit determines that the radio signal is a non-compliant radio signal if the frequency at which the signal strength is equal to or greater than the predetermined strength is other than the compliant frequency.

5. The aforementioned list includes various statuses corresponding to the applicable frequencies, The determination unit determines the compliant wireless signal based on the list, The display processing unit, The signal processing apparatus according to claim 4, wherein the display device displays status images indicating the various statuses.

6. It also includes a reception area for receiving user input, The signal processing apparatus according to claim 5, wherein the display processing unit switches the display and hiding of the status image in response to the operation performed on the receiving unit.

7. The signal processing apparatus according to claim 1, wherein the display processing unit adds a band division display indicating the use of the frequency band to the spectral image.

8. The signal processing apparatus according to claim 1, An antenna for detecting the aforementioned radio waves, A display device that displays an image related to the aforementioned radio waves and A wireless device equipped with the following features.

9. A receiving step of receiving radio waves containing one or more wireless signals, An analysis step to analyze the signal strength for each frequency contained in the aforementioned radio wave, A display step of displaying a spectral image showing the correspondence between the frequency and the signal intensity, A determination step of determining whether a radio signal including the frequency whose signal strength is equal to or greater than a predetermined strength conforms to a predetermined standard, based on the correspondence between the frequency and the signal strength. Includes, A signal processing method comprising the display step of adding to the spectral image at least one of a non-conformity indicator showing non-conformity frequencies included in a non-conformity radio signal determined to be non-conformity to the standard, and a conformity indicator showing conformity frequencies included in a conformity radio signal determined to be conformity to the standard.

10. A receiving step of receiving radio waves containing one or more wireless signals, An analysis step to analyze the signal strength for each frequency contained in the aforementioned radio wave, A display step of displaying a spectral image showing the correspondence between the frequency and the signal intensity, A determination step of determining whether a radio signal including the frequency whose signal strength is equal to or greater than a predetermined strength conforms to a predetermined standard, based on the correspondence between the frequency and the signal strength. Have the computer run it, A signal processing program that, in the display step, adds to the spectral image at least one of a non-conformity indicator showing non-conformity frequencies included in a non-conformity radio signal determined to be non-conformity to the standard, and a conformity indicator showing conformity frequencies included in a conformity radio signal determined to be conformity to the standard.

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