JP7077926B2 - Communication equipment, control methods, and control programs - Google Patents

Description

The present invention relates to communication devices, control methods, and control programs.

A technique for removing noise contained in a spectrum is known in a spectrum analyzer that visually observes the frequency of a received signal.

Patent Document 1 discloses a technique for automatically removing noise from input spectrum data while suppressing rounding of the spectral shape.

Patent Document 2 describes a PL using a fractional divider in a spectrum analyzer.
A technique for removing spurious generated when an L (Phase Locked Loop) circuit is applied as a local signal generator is disclosed.

Japanese Unexamined Patent Publication No. 2010-266258 Japanese Unexamined Patent Publication No. 2008-11182

In the technique described in Patent Document 1, noise is averaged by performing a moving average process on the measured data. The technique described in Patent Document 2 removes noise generated in an internal circuit of a spectrum analyzer. Therefore, in the techniques described in Patent Document 1 and Patent Document 2,
It is difficult for the user to visually identify a specific signal buried in noise.

The present invention has been made in view of the above, and an object of the present invention is to provide a communication device, a control method, and a control program capable of visually displaying a specific signal buried in noise.

The communication device of the first aspect of the present invention includes a first receiving unit that receives a first received signal of a predetermined frequency and demolishes the first received signal, and a frequency of the first received signal. A second receiving unit that receives a second received signal in a frequency band in a predetermined range and displays the frequency spectrum of the second received signal is provided, and the first receiving unit is included in the first receiving signal. A noise reducing unit that reduces at least one of noise and an interference wave and a first control unit that controls the reduction amount of the noise reducing unit are provided. In the second receiving unit, the noise reducing unit is the first. A second control unit that removes noise contained in the second received signal and generates display data of frequency spectra before and after removing the noise of the second received signal based on the processing executed for the first received signal. When,
A display unit for displaying based on the display data is provided.

The control method of the second aspect of the present invention includes a first receiving unit that receives a first received signal of a predetermined frequency and demolishes the first received signal, and a frequency of the first received signal. A control method for a communication device including a second receiving unit that receives a second received signal in a frequency band in a predetermined range and displays a frequency spectrum of the second received signal, and is included in the first received signal. A reduction step of reducing at least one of noise and an interference wave, a removal step of removing noise included in the second received signal based on the processing in the reduction step, and noise of the second received signal are removed. It includes a generation step of generating display data of frequency spectra before and after removal, and a display step of displaying based on the display data.

The control program of the third aspect of the present invention includes a first receiving unit that receives a first received signal of a predetermined frequency and demolishes the first received signal, and a frequency of the first received signal. A computer including a second receiving unit that receives a second received signal in a frequency band in a predetermined range and displays the frequency spectrum of the second received signal has at least noise and interference waves contained in the first received signal. A reduction step for reducing any one, a removal step for removing noise contained in the second received signal based on the processing in the reduction step, and a frequency spectrum before and after removing the noise of the second received signal. The step of generating the display data of the above and the display step of displaying based on the display data are executed.

According to the present invention, it becomes easy to visually discriminate a specific signal buried in noise.

FIG. 1 is a block diagram showing an example of the overall configuration of the communication device according to the embodiment of the present invention. FIG. 2 is a block diagram showing a configuration of an example of a noise blanker used in the communication device according to the embodiment of the present invention. FIG. 3 is a block diagram showing an example of the configuration of a control unit in the spectrum analyzer of the communication device according to the embodiment of the present invention. FIG. 4 is a block diagram showing an example of the configuration of the spectrum generation unit of the control unit of the spectrum analyzer according to the embodiment of the present invention. FIG. 5A is a diagram showing an example of a first frequency spectrum including pulse noise. FIG. 5B is a diagram showing an example of a second frequency spectrum from which pulse noise has been removed. FIG. 5C is a diagram showing an example in which the first frequency spectrum and the second frequency spectrum are combined. FIG. 6A is a diagram showing an example of a second frequency spectrum in which noise is included in a specific narrow band. FIG. 6B is a diagram showing an example of a first frequency spectrum in which noise in a specific narrow band is removed. FIG. 6C is a diagram showing an example in which the first frequency spectrum and the second frequency spectrum are combined. FIG. 7 is a diagram for explaining an example in the case where a plurality of signals are included in the frequency spectrum after removing noise. FIG. 8 is a flowchart showing an example of the operation flow of the spectrum analyzer of the communication device according to the embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The embodiment of the present invention can be suitably used in a communication device such as an amateur radio. note that,
In each figure, the same or corresponding parts are designated by the same reference numerals, and the description thereof will be omitted as appropriate.

FIG. 1 is a block diagram showing an example of the overall configuration of the communication device according to the embodiment of the present invention. As shown in FIG. 1, the communication device 1 includes a demodulator (also referred to as a first receiver) 10, a spectrum analyzer (also referred to as a second receiver) 20, an antenna 31, a first mixer 32, and a first. A local oscillator 33 is provided.

The antenna 31 receives a received signal having a specific frequency. The antenna 31 supplies the received received signal as an RF (Radio Frequency) signal to the first mixer 32. The first local oscillator 33 generates an oscillation signal having a first local oscillation frequency and supplies it to the first mixer 32. As a result, the first mixer 32 generates a first IF signal, which is an intermediate frequency (IF) signal, by down-converting the frequency of the RF signal based on the first local oscillation frequency. The first mixer 32 uses the generated first IF signal as a demodulator 10.
And supply to the spectrum analyzer 20. The first IF signal is a received signal of each of the demodulator 10 and the spectrum analyzer.

The first IF signal supplied to the demodulator 10 is a first bandpass filter (BPF: Band Pa).
After passing through the ss Filter) 11, it is amplified by the first amplifier 12, and the first noise reducing unit 1
It is supplied to 3-1.

The first noise reducing unit 13-1 reduces the noise contained in the first IF signal. The first noise reduction unit 13-1 can be realized by, for example, a noise blanker that reduces pulse noise included in the first IF signal.

An example of the configuration of the first noise reduction unit 13-1 will be described with reference to FIG. 2. FIG. 2 is a block diagram showing an example of a configuration when the first noise reducing unit 13-1 is a noise blanker. As shown in FIG. 2, the first noise reduction unit 13-1 includes a logarithmic converter 131, an envelope derivation unit 132, a peak derivation unit 133, a threshold value derivation unit 134, an attenuation derivation unit 135, and an attenuation unit. It is equipped with 136.

The first IF signal is supplied to the logarithmic converter 131 from the first amplifier 12. In this case, the logarithmic converter 131 performs logarithmic conversion on the supplied first IF signal by performing logarithmic conversion.
Convert the first IF signal to a logarithmic value. The logarithmic converter 131 outputs the first IF signal converted into a logarithm to the envelope deriving unit 132 and the attenuation deriving unit 135.

The comprehensive line derivation unit 132 derives the envelope of the modulated wave from which the pulse noise is removed from the logarithmically converted first IF signal. Specifically, the comprehensive line derivation unit 132 uses a first integrator that has a larger time constant when the signal becomes larger than the time constant when the signal becomes smaller for the log-converted first IF signal. The wrapping line is derived by integrating. The comprehensive line derivation unit 132 outputs the derived comprehensive line to the peak derivation unit 133.

The peak derivation unit 133 derives a peak curve based on the peak of the envelope derived by the inclusion line derivation unit 132. For example, the peak derivation unit 133 derives a peak curve by integrating an envelope using a second integrator having a larger time constant when the signal becomes smaller than the time constant when the signal becomes larger. The peak derivation unit 133 outputs the derived peak curve to the threshold value derivation unit 134.

The threshold value derivation unit 134 derives a threshold value reference curve that serves as a threshold value reference based on the peak curve. The threshold derivation unit 134 derives a threshold reference curve by integrating the peak curve using, for example, a third integrator whose time constant when the signal becomes smaller is larger than the second integrator. Further, the threshold value derivation unit 134 may derive a threshold value reference curve by sampling the peak curve and calculating the difference between the peak values before and after sampling. In this case, the threshold value derivation unit 134
For example, when the difference value is less than a predetermined threshold value for a predetermined predetermined time, it is determined that the input signal has disappeared. Then, the threshold value derivation unit 134 resets the operation of the third integrator, and then executes the integration again using the third integrator. Further, the threshold value derivation unit 134 may derive a threshold value reference curve by maintaining the peak value of the peak curve for a predetermined time by using a peak hold device. The threshold value derivation unit 134 outputs the derived threshold value reference curve to the attenuation derivation unit 135.

The attenuation derivation unit 135 derives the threshold value curve by adding a predetermined offset value to the threshold value reference curve. Based on the threshold curve, the attenuation derivation unit 135 does not attenuate if the logarithmically converted first IF signal is less than the threshold curve, and if the logarithmically converted first IF signal is greater than or equal to the threshold value, the first I
An attenuation characteristic line that attenuates according to the logarithmic value of the F signal is derived. The attenuation derivation unit 135 outputs the derived attenuation characteristic line to the attenuation unit 136.

The attenuation unit 136 receives the first IF signal and the attenuation characteristic line. The attenuation unit 136 attenuates the noise contained in the first IF signal according to the attenuation characteristic line derived by the attenuation derivation unit 135. The attenuation unit 136 supplies the attenuated first IF signal to the second mixer 14.

Refer to FIG. 1 again. The second mixer 14 receives the first IF signal attenuated from the attenuation unit 136. The second local oscillator 15 generates an oscillation signal having a second local oscillation frequency, and outputs the transmission signal to the second mixer 14. As a result, the second mixer 14 down-converts the frequency of the first IF signal based on the second local oscillation frequency to generate the second IF signal. The second mixer 14 outputs the generated second IF signal to the second noise reducing unit 13-2.

The second noise reducing unit 13-2 reduces the noise contained in the second IF signal. The first noise reducing unit 13-1 can be realized by, for example, a notch filter that reduces an interference signal in a specific band caused by interference or a beat of a single frequency. The second noise reduction unit 13-2 outputs the noise-reduced second IF signal to the low-pass filter (LPF: LOW Pass Filter) 16.

The noise-reduced second IF signal passes through the low-pass filter 16 and then the detector 1
It is detected by 7 and supplied to the speaker 18. The speaker 18 converts the second IF signal detected by the detector 17 into sound and outputs it to the outside.

The first control unit 19 controls the amount of noise reduction in the first noise reduction unit 13-1 and the second noise reduction unit 13-2. The user is, for example, an operation button provided on the communication device 1.
By operating (not shown), the noise reduction amount of the first control unit 19 can be adjusted. The first control unit 19 has a first noise reduction unit 13-1 and a second noise reduction unit 13-2.
The reduction information regarding the amount of noise reduction is supplied to the spectrum analyzer 20. For example, when the user adjusts the reduction amount, the first control unit 19 adjusts the reduction amount of the first noise reduction unit 13-1 or the second noise reduction unit 13-2, and reduces information regarding the reduction amount. Is supplied to the spectrum analyzer 20. Such a first control unit 19 is, for example, a CPU.
It can be realized by an electronic circuit including (Central Processing Unit).

Next, an example of the configuration of the spectrum analyzer 20 will be described.

The spectrum analyzer 20 of the communication device 1 according to the embodiment of the present invention displays a received signal in a frequency band in a predetermined range including the reception frequency of the demodulator 10 as a waveform of the frequency spectrum. The first IF signal supplied to the spectrum analyzer 20 is a signal in a frequency band in a predetermined range including the reception frequency of the demodulator 10. The first IF signal passes through the second bandpass filter 21, is amplified by the second amplifier 22, and is supplied to the third mixer 23. The third local oscillator 24 generates an oscillation signal having a second local oscillation frequency and supplies it to the third mixer 23. As a result, the third mixer 23 generates the third IF signal by down-converting the frequency of the first IF signal based on the second local oscillation frequency. Third mixer 23
Outputs the third IF signal to the third bandpass filter 25.

The third IF signal passes through the third bandpass filter 25 and is supplied to the A / D (analog / digital) converter 26. The A / D converter 26 converts the third IF signal into a digital IF signal by performing analog-to-digital conversion on the third IF signal at a predetermined sampling frequency. The A / D converter 26 outputs a digital IF signal to the second control unit 27.

The second control unit 27 removes noise contained in the digital IF signal. Specifically, the second control unit 27 removes noise contained in the digital IF signal based on the reduction information regarding the noise reduction amount of the first noise reduction unit 13-1 or the second noise reduction unit 13-2. do. As a result, the second control unit 27 reflects in the spectrum analyzer 20 the process of reducing the noise executed by the demodulator 10 with respect to the received signal. The second control unit 27 is a digital IF
The processing performed on the signal does not have to be the same as the processing performed by the first noise reducing unit 13-1 or the second noise reducing unit 13-2. The second control unit 27 performs the processing corresponding to the processing performed by the first noise reduction unit 13-1 or the second noise reduction unit 13-2 on the digital IF signal. Specifically, the second control unit 27 performs processing such as removal of stationary noise by the spectral subtraction method, removal of beats by a beat canceller, and removal of pulse noise by a noise blanker. In this case, the user can select which noise processing to execute, for example, by operating an operation button (not shown) provided on the spectrum analyzer 20. The second control unit 27 can be realized by, for example, an electronic circuit including a CPU (Central Processing Unit).

The configuration of the second control unit 27 will be described with reference to FIG. FIG. 3 is a block diagram showing an example of the configuration of the second control unit 27.

As shown in FIG. 3, the second control unit 27 includes a noise reduction control unit 41, a noise removal unit 42, a first spectrum generation unit 43, a second spectrum generation unit 44, and a synthesis unit 45.

The noise reduction control unit 41 controls the noise removal unit 42. Specifically, the noise reduction control unit 41 receives reduction information regarding at least one reduction amount of the first noise reduction unit 13-1 and the second noise reduction unit 13-2 from the first control unit 19 of the demodulator 10. .. Then, the noise removal control unit 41 controls the noise removal amount of the noise removal unit 42 based on the received reduction information. That is, in the present embodiment, the spectrum analyzer 20 has a function that reflects the function of reducing noise in the demodulator 10.

The noise removing unit 42 receives a digital IF signal from the A / D converter 26. The noise removing unit 42 removes noise contained in the digital IF signal according to the control of the noise removing control unit 41. In this case, the noise removing unit 42 performs the processing corresponding to the processing executed by the first noise reducing unit 13-1 of the demodulator 10 and the second noise reducing unit 13-2 on the second IF signal, as a digital IF. Execute for the signal. Therefore, the processing executed by the noise removing unit 42 for the digital IF signal is the same as the processing executed by the first noise reducing unit 13-1 or the second noise reducing unit 13-2 for the second IF signal. Not limited to. The noise removing unit 42 outputs the noise-removed digital IF signal to the second spectrum generation unit 44.

The first spectrum generation unit 43 receives a digital IF signal from the A / D converter 26.
The first spectrum generation unit 43 generates a first frequency spectrum as a spectrum of a digital IF signal containing noise. The first spectrum generation unit 43 outputs the generated first frequency spectrum to the synthesis unit 45.

The second spectrum generation unit 44 is a digital IF in which noise is removed from the noise removal unit 42.
Accept the signal. The second spectrum generation unit 44 generates a second frequency spectrum as a spectrum of a digital IF signal from which noise has been removed. The second spectrum generation unit 44 outputs the generated second frequency spectrum to the synthesis unit 45.

The configuration with the first spectrum generation unit 43 will be described with reference to FIG. 4. FIG. 4 is a block diagram showing an example of the configuration of the first spectrum generation unit 43. Since the configuration of the second spectrum generation unit 44 is the same as that of the first spectrum generation unit 43, the description thereof will be omitted.

The first spectrum generation unit 43 includes a window function application unit 51, a Fourier transformer 52, a power spectrum calculation unit 53, a logarithmic converter 54, and an interpolation processing unit 55.

The window function application unit 51 applies a predetermined window function to the received signal. In particular,
The window function application unit 51 has a buffer (not shown). The buffer is the window function application unit 5.
A delay signal is generated by buffering the signal received by 1. The buffer can hold at least a delay signal having the number of points N (N is an arbitrary integer) required for the FFT (Fast Fourier Transform) executed by the Fourier transformer 52. In this case, the window function application unit 51
Applies a window function of predetermined length to N delay signals. The window function is not particularly limited, and is, for example, a Hanning window and a Humming window. The window function application unit 51 outputs a signal to which the window function is applied to the Fourier transformer 52.

The Fourier transformer 52 calculates the amplitude of each frequency component by executing FFT on the signal received from the window function application unit 51. The Fourier transformer 52 outputs the calculated result to the power spectrum calculation unit 53.

The power spectrum calculation unit 53 is based on the result supplied from the Fourier transformer 52.
Calculate the power spectrum of each frequency component. The power spectrum calculation unit 53 outputs the calculated power spectrum to the logarithmic converter 54.

The logarithmic converter 54 converts the power spectrum into a dB value by performing logarithmic conversion on the power spectrum supplied from the power spectrum calculation unit 53. The logarithmic converter 54
The power spectrum converted into the dB value is output to the interpolation processing unit 55.

The interpolation processing unit 55 generates a first frequency spectrum by interpolating and thinning the number of data according to the number of display data of the display unit 28 with respect to the signal supplied from the logarithmic converter 54. The interpolation processing unit 55 outputs the generated one frequency spectrum to the outside.

The synthesis unit 45 receives the first frequency spectrum from the first spectrum generation unit 43, receives the second frequency spectrum from the second spectrum generation unit, and outputs the second frequency spectrum to the display unit 28 as display data. The synthesizing unit 45 may synthesize the first frequency spectrum and the second frequency spectrum. Specifically, the synthesizing unit 45 synthesizes the first frequency spectrum and the second frequency spectrum so that the display unit 28 shown in FIG. 1 can display the first frequency spectrum and the second frequency spectrum at the same time. Further, either the first frequency spectrum before noise removal or the second frequency spectrum after noise removal may be output as display data.

An example of the process of synthesizing the first frequency spectrum and the second frequency spectrum will be described with reference to FIGS. 5A, 5B, and 5C. FIG. 5A is a diagram showing an example of a first frequency spectrum including pulse noise. FIG. 5B is a diagram showing an example of a second frequency spectrum from which pulse noise has been removed. FIG. 5C is a diagram showing an example in which the first frequency spectrum and the second frequency spectrum are combined.

The first frequency spectrum 61 is an example of a frequency spectrum containing noise generated by the first spectrum generation unit 43. As shown in FIG. 5A, the first frequency spectrum 61 contains pulse noise over a wide range of the section T1. In such a case, even if the received signal is included in the first frequency spectrum 61 in the section T1, the user cannot grasp the signal.

The second frequency spectrum 62 is an example of a frequency spectrum from which noise has been removed, which is generated by the second spectrum generation unit 44. As shown in FIG. 5B, in the second frequency spectrum 62, the pulse noise included in the section T1 is removed in the first frequency spectrum 61. In this case, the noise removing unit 42 shown in FIG. 3 is, for example, a digital I.
A process corresponding to a noise blanker is executed for the F signal. As a result, in the second frequency spectrum 62, it becomes clear that the signal 71 buried in the pulse noise is included in the section T2. The signal 71 is, for example, an audio signal buried in noise.

5C is a diagram showing the first frequency spectrum 61 shown in FIG. 5A and the second frequency spectrum 62 shown in FIG. 5B superimposed. The synthesis unit 45 superimposes the first frequency spectrum 61 received from the first spectrum generation unit 43 and the second frequency spectrum 62 received from the second spectrum generation unit 44 to generate the figure shown in FIG. 5C. In this case, the display unit 28 displays the figure shown in FIG. 5C to the user. That is, in the present embodiment, the frequency spectrum before the noise is removed and the frequency spectrum after the noise is removed can be visually displayed to the user at the same time. Further, the first frequency spectrum 61 shown in FIG. 5A and the second frequency spectrum 62 shown in FIG. 5B may be displayed side by side, or the first frequency spectrum 61 shown in FIG. 5A and the second frequency spectrum 62 shown in FIG. 5B may be displayed side by side. The second frequency spectrum 62 and the respective displays may be switched.

Next, an example of a process of synthesizing a frequency spectrum containing noise different from that of FIGS. 5A to 5C will be described using FIGS. 6A, 6B, and 6C. FIG. 6A is a diagram showing an example of a second frequency spectrum in which noise is included in a specific narrow band. FIG. 6B is a diagram showing an example of a first frequency spectrum in which noise in a specific narrow band is removed. FIG. 6C is a diagram showing an example in which the first frequency spectrum and the second frequency spectrum are combined.

The first frequency spectrum 63 is an example of a frequency spectrum containing noise generated by the first spectrum generation unit 43. As shown in FIG. 6A, noise is included in the narrow band of the section T3 in the first frequency spectrum 63. Such noise occurs, for example, when the communication device 1 receives an interference signal in the band in the section T3 and interferes with the received signal and the interference signal.

The second frequency spectrum 64 is an example of a frequency spectrum from which noise has been removed, which is generated by the second spectrum generation unit 44. As shown in FIG. 6B, in the second frequency spectrum 64, the noise included in the section T3 is removed in the first frequency spectrum 63. In this case, the noise removing unit 42 shown in FIG. 3 performs, for example, a process corresponding to a notch filter on the digital IF signal.

FIG. 6C is a diagram showing the first frequency spectrum 63 shown in FIG. 6A and the second frequency spectrum 64 shown in FIG. 6B superimposed. That is, in the present embodiment, regardless of the type of noise, the frequency spectrum before the noise is removed and the frequency spectrum after the noise is removed can be visually displayed to the user at the same time. ..

Although only one received signal is included in the second frequency spectrum 62 shown in FIGS. 5A to 5C, in the present embodiment, even if a plurality of signals are included in the frequency spectrum after noise is removed. good. FIG. 7 is a diagram for explaining an operation when a plurality of signals are included in the frequency spectrum after removing noise.

The first frequency spectrum 65 is an example of a frequency spectrum containing noise generated by the first spectrum generation unit 43. The second frequency spectrum 66 is an example of a frequency spectrum from which noise has been removed, which is generated by the second spectrum generation unit 44.
As shown in FIG. 7, the second frequency spectrum 66 includes the first signal 81 and the second signal 82.
A third signal 83 is included. In this case, in the present embodiment, when a plurality of signals are included in a specific frequency band, a frequency spectrum containing noise and a frequency spectrum from which noise is removed and containing a plurality of signals are visually simultaneously displayed to the user. On the other hand, it can be displayed. That is, in this embodiment, the first frequency spectrum 65 and the second frequency spectrum 66
A specific signal can be extracted based on. The first signal 81, the second signal 82,
The third signal 83 is, for example, an audio signal. Further, the first signal 81, the second signal 82, and the like.
The third signal 83 may be, for example, different types of signals.

With reference to FIG. 8, the operation of the second control unit 27 synthesizing the frequency spectrum before the noise is removed and the frequency spectrum after the noise is removed will be described. FIG. 8 is a flowchart showing the flow of operation of the second control unit 27.

First, the second control unit 27 receives a digital IF signal from the outside (step S101).
). It is assumed that the digital IF signal received in step S101 contains noise.

Next, the second control unit 27 receives reduction information regarding noise reduction from the demodulator 10 (step S102). The second control unit 27 adjusts the removal amount for removing noise contained in the digital IF signal based on the reduction information (step S103). The second control unit 27 removes noise contained in the digital IF signal according to the adjusted removal amount (step S10).
4).

Next, the second control unit 27 generates the first frequency spectrum from the digital IF signal containing noise (step S105). The second control unit 27 in step S104.
Generate a second frequency spectrum from the noise-removed digital IF signal (step S)
106).

The second control unit 27 synthesizes the first frequency spectrum and the second frequency spectrum so as to be superimposed and displayed (step S107). Then, the second control unit 27 causes the display unit 28 to display the result of synthesizing the first frequency spectrum and the second frequency spectrum (step S108).

As described above, in the present embodiment, the spectrum analyzer of the communication device can display the waveform before noise removal and the waveform after noise removal in an overlapping manner.
As a result, the user can visually grasp the waveform before and after removing the noise, so that a weak signal buried in the noise can be easily identified. That is, by applying this embodiment to an amateur radio, it becomes easy to discriminate signals.

In the present embodiment, the input signal of the spectrum analyzer containing various noises can be subjected to processing such as removal of stationary noise by the spectrum subtraction method, removal of beats by a beat canceller, and removal of pulse noise by a noise blanker. .. As a result, the user can perform the desired noise processing, so that the target signal buried in the noise can be easily identified.

In the present embodiment, when a plurality of signals are included in a specific frequency band, the frequency spectrum including noise and the frequency spectrum from which noise is removed and containing the plurality of signals are visually simultaneously displayed to the user. can do. This makes it easy to operate the communication device so as to receive a desired signal among a plurality of received signals.

The components described above include those that can be easily assumed by those skilled in the art and those that are substantially the same. Further, the configurations described above can be combined as appropriate. Further, various omissions, substitutions or changes of the configuration can be made without departing from the gist of the present invention.

1 Communication device 10 Demodulator (first receiver)
11 1st bandpass filter 12 1st amplifier 13-1 1st noise reduction section (noise reduction section)
13-2 Second noise reduction section (noise reduction section)
14 Second mixer 15 Second local oscillator 16 Low-pass filter 17 Detector 18 Speaker 19 First control unit 20 Spectrum analyzer (second receiver)
21 2nd bandpass filter 22 2nd amplifier 23 3rd mixer 24 3rd local oscillator 25 3rd bandpass filter 26 A / D converter 27 2nd control unit 28 Display unit 31 Antenna 32 1st mixer 33 1st local oscillator 41 Noise removal control unit 42 Noise removal unit 43 First spectrum generation unit 44 Second spectrum generation unit 45 Synthesis unit 51 Window function application unit 52 Fourier converter 53 Power spectrum calculation unit 54 Log converter 55 Interpolation processing unit 61, 63, 65 1st frequency spectrum 62,64,66 2nd frequency spectrum 71 signal 81 1st signal 82 2nd signal 83 3rd signal 131 log converter 132 comprehensive line derivation part 133 peak derivation part 134 threshold derivation part 135 attenuation derivation part 136 Damping part

Claims (9)

A first receiving unit that receives a first received signal of a predetermined frequency and demodulates the first received signal.
A second receiving unit for receiving a second receiving signal in a frequency band in a predetermined range including the frequency of the first receiving signal and displaying the frequency spectrum of the second received signal is provided.
The first receiver is
A noise reducing unit that reduces at least one of the noise and the interference wave included in the first received signal, and the noise reducing unit.
It is provided with a first control unit that controls the reduction amount of the noise reduction unit.
The second receiver is
Display data of the frequency spectrum before and after removing the noise contained in the second received signal and removing the noise of the second received signal based on the processing executed by the noise reducing unit for the first received signal. The second control unit that generates
A communication device including a display unit for displaying based on the display data. The second control unit
It is characterized by generating display data of either or both of the first frequency spectrum before removing the noise of the second received signal and the second frequency spectrum after removing the noise of the second received signal. The communication device according to claim 1. The communication device according to claim 2, wherein the display unit displays the first frequency spectrum and the second frequency spectrum in an overlapping manner. The second control unit
A noise removing unit that removes noise from the second received signal,
It is provided with a noise removal control unit that controls the removal amount of the noise removal unit.
The noise reduction control unit receives reduction information regarding the reduction amount from the first control unit.
The communication device according to any one of claims 1 to 3, wherein the removal amount is controlled based on the reduction information. The communication device according to claim 4, wherein the noise reduction control unit controls the noise reduction unit so as to execute a process corresponding to at least one process of the noise blanker and the notch filter. A first receiving unit that receives a first received signal of a predetermined frequency and demodulates the first received signal, and a second received signal in a frequency band in a predetermined range including the frequency of the first received signal. Receive and
A method for controlling a communication device including a second receiving unit for displaying the frequency spectrum of the second receiving signal.
A reduction step for reducing at least one of noise and interference waves contained in the first received signal, and
A removal step for removing noise contained in the second received signal based on the processing in the reduction step, and a removal step.
The generation step of generating the display data of the frequency spectrum before and after removing the noise of the second received signal, and the generation step.
A control method including a display step to display based on the display data. The display step is
The control method according to claim 6 , wherein the two frequency spectra before and after removing the noise of the second received signal are superimposed and displayed. A first receiving unit that receives a first received signal of a predetermined frequency and demodulates the first received signal, and a second received signal in a frequency band in a predetermined range including the frequency of the first received signal. Receive and
A computer including a second receiver that displays the frequency spectrum of the second receive signal.
A reduction step for reducing at least one of noise and interference waves contained in the first received signal, and
A removal step for removing noise contained in the second received signal based on the processing in the reduction step, and a removal step.
The step of generating display data of the frequency spectrum before and after removing the noise of the second received signal, and
A control program that executes a display step to be displayed based on the display data. The display step is
The control program according to claim 8 , wherein the two frequency spectra before and after removing the noise of the second received signal are superimposed and displayed.

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