JP2012186799A - Interfering wave detection device and interfering wave elimination device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an interfering wave elimination device by considering a point that an interfering degree of an interfering wave to a desired wave depends on a modulation factor of the interfering wave.SOLUTION: An interfering wave elimination device includes an intermediate frequency conversion part 3 in which a received signal is converted to an intermediate frequency signal, a filter part 4 in which a desired wave is extracted from the intermediate frequency signal, and an interfering wave detection part 6 in which an interfering wave is detected and a pass bandwidth at the filter part 4 is controlled. The interfering wave detection part 6 includes a pass bandwidth control part 18 in which the pass bandwidth for a desired wave at the filter part 4 is controlled, neighbor frequency band signal extraction parts 12 to 15 in which bandpass filters at neighbor frequency band to the center frequency of the desired wave are allocated, a modulation factor detection part 17 in which a modulation factor of an interfering wave is detected based on the output of the neighbor frequency band signal extraction parts. The pass bandwidth control part 18 controls a pass bandwidth at the filter part 4 based on the output of the modulation factor detection part 17.

Description

  The present invention relates to an interference wave detection device and an interference wave removal device, and more specifically, an interference wave detection device that detects an interference wave with respect to a desired wave and suppresses the influence of the interference wave on the desired wave, and the interference wave detection device thereof. The present invention relates to an interference wave removing device that removes the interference wave detected in (1).

  In general, when a radio receiver or the like receives a signal of a desired frequency (hereinafter referred to as a “desired wave”) and there is a broadcasting station using a frequency near the desired wave, The reception quality deteriorates due to the influence. Therefore, in a radio receiver or the like, an IF (Intermediate) that detects a signal in the vicinity of the desired wave (hereinafter referred to as “(near) jamming wave” as appropriate) and passes the intermediate frequency signal of the reception signal on the receiver side. Countermeasures are taken such as changing the passband width of the (Frequency) filter to reduce the influence of the interference wave.

  As a method for detecting the presence / absence of such interference waves, for example, the one described in Patent Document 1 efficiently removes interference waves adjacent to a reception desired wave and is adjacent to the received signal after detection with less distortion. This relates to a receiver with an interference wave canceling function. In this patent document 1, the pass band width of the IF filter is controlled by threshold determination based on the signal strength of the desired wave and the disturbing wave, and further, in order to prevent erroneous detection of the desired wave as the disturbing wave, The modulation degree of the wave is detected, and the threshold value is controlled when the desired wave is overmodulated.

  In addition, the device described in Patent Document 2 relates to a detection device and an interference wave removing device that removes the detected interference wave. The pass bandwidth of the IF filter is controlled in accordance with the frequency range in which the wave exists (see paragraphs [0023] to [0025]).

International Publication WO2007-000882 (Patent No. 4203111) JP 2004-40367 A

  However, in the method described in Patent Document 2 described above, a frequency range in which adjacent interfering waves exist is measured while sequentially scanning the bandpass filter, so that a time difference occurs in the output from each bandpass filter. For example, since there is a time difference between the outputs of the bandpass filters (BPF + 1) and (BPF + 2), the method described in Patent Document 2 shows that when the frequency range in which adjacent interfering waves exist changes in a very short time. There is a problem that an appropriate instantaneous value indicating the frequency range cannot be expressed.

  The present invention has been made in view of such problems, and an object of the present invention is to detect an interference wave with respect to a desired wave and suppress the influence of the interference wave on the desired wave and the interference thereof. An object of the present invention is to provide an interference wave removing device for removing an interference wave detected by a wave detection device.

  The present invention has been made to achieve such an object, and the invention according to claim 1 detects an interference wave with respect to a desired wave and suppresses the influence of the interference wave on the desired wave. A frequency band signal extraction unit having a bandpass filter disposed in a frequency band near the center frequency of the desired wave, and a maximum signal intensity and an average signal strength of an interference wave passing through the frequency band signal extraction unit And a nearby frequency band modulation degree detection unit, and a pass bandwidth control unit that controls a pass bandwidth of the desired wave based on an output result of the neighboring frequency band modulation degree detection unit. To do.

  According to a second aspect of the present invention, in the first aspect of the present invention, a desired frequency band signal extraction unit in which a bandpass filter is disposed at a center frequency position of the desired wave, and the desired frequency band signal extraction unit are provided. A desired wave modulation degree detection unit that detects a maximum signal intensity and an average signal intensity of the desired wave passing through, and the pass bandwidth control unit outputs an output result of the desired wave modulation degree detection unit and the vicinity The passband width of the desired wave is controlled based on the output result of the frequency band modulation degree detection unit.

The invention according to claim 3 is the invention according to claim 1 or 2, wherein the neighboring frequency band is a first neighboring frequency band that is a frequency band close to a center frequency of the desired wave, and the desired wave. A second neighboring frequency band that is a frequency band close to the center frequency of the first neighboring frequency band signal extracting unit, wherein the neighboring frequency band signal extracting unit includes a bandpass filter disposed in the first neighboring frequency band; A second neighboring frequency band signal extraction unit in which a bandpass filter is disposed in the second neighboring frequency band, and the neighboring frequency band modulation degree detection unit passes through the first neighboring frequency band signal extraction unit. A first neighboring frequency band modulation degree detecting unit for detecting the maximum signal intensity and the average signal intensity of the wave, and a second neighboring frequency band modulation for detecting the modulation degree of the disturbing wave passing through the second neighboring frequency band signal extracting unit. And a degree detector ,
The passband width control unit controls the passband width of the desired wave based on an output result of the first neighboring frequency band modulation degree detection unit and an output result of the second neighboring frequency band modulation degree detection unit. It is characterized by doing.

According to a fourth aspect of the present invention, in the third aspect of the present invention, the second neighboring frequency band modulation degree detecting unit is configured to provide a maximum signal strength of an interference wave that passes through the second neighboring frequency band signal extracting unit. And the average signal intensity are detected, and the modulation degree of the interference wave is detected based on the maximum signal intensity and the average signal intensity.
The invention according to claim 5 is an interfering wave detection device that detects an interfering wave with respect to a desired wave and suppresses the influence of the interfering wave on the desired wave, and has a band at a frequency position of the center frequency of the desired wave. A desired frequency band signal extracting unit in which a pass filter is disposed; a desired wave modulation degree detecting unit for detecting a maximum signal intensity and an average signal intensity of a desired wave passing through the desired frequency band signal extracting unit; and a center of the desired wave Based on the output result of the nearby frequency band signal extraction unit in which a band pass filter is installed in the nearby frequency band of the frequency, the desired wave modulation degree detection unit, and the output result of the nearby frequency band signal extraction unit, the desired wave passes And a pass bandwidth control unit for controlling the bandwidth.

The invention according to claim 6 is the invention according to claim 5, further comprising a nearby frequency band modulation degree detection unit that detects a modulation degree of an interference wave that passes through the nearby frequency band signal extraction unit. It is characterized by.
The invention according to claim 7 is an interference wave removing apparatus for removing an interference wave from a received signal, an intermediate frequency converting unit for converting the received signal into an intermediate frequency signal, and a desired frequency from the intermediate frequency signal. An interference wave detection device comprising: a filter unit that extracts a desired wave that is a signal in a band; and an interference wave detection unit that detects the interference wave and controls a pass bandwidth in the filter unit, the interference wave detection device Detects a near frequency band signal extraction unit in which a band pass filter is arranged in the vicinity of the center frequency of the desired wave, and detects the maximum signal strength and the average signal strength of the interference wave passing through the near frequency band signal extraction unit A neighboring frequency band modulation degree detecting unit, and a pass bandwidth control unit for controlling a pass bandwidth in the filter unit based on an output result of the neighboring frequency band modulation degree detecting unit. To.

  The invention according to claim 8 is an interference wave removing device for removing an interference wave from a received signal, an intermediate frequency converting unit for converting the received signal into an intermediate frequency signal, and a desired frequency from the intermediate frequency signal. An interference wave detection device comprising: a filter unit that extracts a desired wave that is a signal in a band; and an interference wave detection unit that detects the interference wave and controls a pass bandwidth in the filter unit, the interference wave detection device Detects a desired frequency band signal extraction unit in which a band pass filter is arranged at a frequency position of the center frequency of the desired wave, and detects a maximum signal intensity and an average signal intensity of the desired wave passing through the desired frequency band signal extraction unit A desired wave modulation degree detection unit, an adjacent frequency band signal extraction unit in which a band pass filter is disposed in the vicinity frequency band of the center frequency of the desired wave, an output result of the desired wave modulation degree detection unit, Based on the output results of the frequency band signal extractor, characterized in that a passband-width control unit for controlling the pass bandwidth of the filter unit.

  According to the present invention, an interference wave detection device that detects an interference wave with respect to a desired wave and suppresses the influence of the interference wave on the desired wave, and an interference wave removal device that removes the interference wave detected by the interference wave detection device are realized. can do.

It is a block diagram for demonstrating one Embodiment of the receiver of the jamming wave detection apparatus which concerns on this invention. FIG. 2 is a specific block configuration diagram for explaining an interference wave detection unit illustrated in FIG. 1. It is a figure which shows the example of the passage characteristic of BPF used for FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a configuration diagram for explaining an embodiment of a receiving device of an interference wave detecting device according to the present invention. In the figure, reference numeral 1 is a receiving device, 2 is an antenna, 3 is a front end unit (intermediate frequency converting unit) 4 is an IF filter (filter unit), 5 is a detection unit, and 6 is an interference wave detection unit.
The interference wave detection apparatus according to the present invention includes an antenna 2, a reception device 1 including a front end unit 3, an IF filter 4, a detection unit 5, and an interference wave detection unit 6, and detects an interference wave with respect to a desired wave. Thus, the influence of the disturbing wave on the desired wave is suppressed.

  The receiving device 1 is a receiving device for receiving, for example, FM (Frequency Modulation) radio. The front end unit 3 receives a signal from the antenna 2, performs channel selection and amplification processing, and then down-converts the frequency of this signal to an intermediate frequency. The IF filter 4 receives the output of the front end unit 3, and its passband width is controlled by the interference wave detection unit 6 to extract an intermediate frequency signal in a desired band. The IF filter 4 can be realized by, for example, an FIR (Finite Impulse Response Filter) filter. The FM detector 5 receives the output of the IF filter 4 and performs a detection (demodulation) process.

The jamming wave detection unit 6 detects the degree of modulation of the jamming wave and controls the passband width (passband width of the IF filter 4) of the desired wave, which is a signal in a desired frequency band, based on the detection result.
FIG. 2 is a specific block diagram for explaining the interfering wave detector shown in FIG. The interference wave detection unit 6 detects the signal intensity of each band of a desired wave BPF (desired wave bandpass filter) 11 (desired frequency band signal extraction unit), +100 kHz BPF 12, −100 kHz BPF 13, +200 kHz BPF 14, and −200 kHz BPF 15. A signal intensity detection unit 16, a modulation degree detection unit 17 that detects the modulation degree of the desired wave and the interference wave, and a pass bandwidth control unit 18 for controlling the pass band width of the desired wave are provided. Also, the BPFs 12 to 15 constitute a nearby frequency band signal extraction unit, and the nearby frequency band signal extraction units 12 to 15 are configured by disposing a bandpass filter at a position near the center frequency of the desired wave. The pass bandwidth control unit 18 controls the pass bandwidth of the desired wave based on the output results of the nearby frequency band signal extraction units 12 to 15.

The interference wave detection device according to the present invention further includes a desired frequency band signal extraction unit 11 in which a bandpass filter is arranged at the center frequency position of the desired wave, and the pass bandwidth control unit 18 extracts the desired frequency band signal. The passband width of the desired wave is controlled based on the output result of the unit 11 and the output results of the nearby frequency band signal extraction units 12 to 15.
The modulation degree detection unit 17 detects the maximum signal intensity and the average signal intensity of the desired wave and the interference wave that pass through the bandpass filter, and determines the modulation degree of the desired wave and the interference wave based on the maximum signal intensity and the average signal intensity. It is to detect.

  The desired wave BPF 11 is a BPF in which the center frequency of the pass bandwidth is installed at the position of the center frequency of the desired wave. The +100 kHz BPF 12 is a BPF in which the center frequency of the pass bandwidth is installed at a position of +100 kHz with respect to the center frequency of the desired wave. The −100 kHz BPF 13 is a BPF in which the center frequency of the pass bandwidth is set at a position of −100 kHz with respect to the center frequency of the desired wave. The +200 kHz BPF 14 is a BPF in which the center frequency of the pass bandwidth is installed at a position of +200 kHz with respect to the center frequency of the desired wave. The −200 kHz BPF 15 is a BPF in which the center frequency of the pass bandwidth is installed at a position of −200 kHz with reference to the center frequency of the desired wave.

In the present embodiment, the BPFs 12 to 15 for detecting the interference wave are arranged at intervals of 100 kHz before and after the center frequency of the desired wave (BPFs 12 to 15). For example, it may be determined according to the interval of channels that can be allocated to broadcasting stations determined by the laws of each country.
In the present embodiment, a frequency band close to the center frequency of the desired wave is set as the first vicinity frequency band, and a frequency band far from the center frequency of the desired wave is set as the second vicinity frequency band, and +100 kHz and − 100 kHz is included in the first nearby frequency band, and +200 kHz and −200 kHz are included in the second nearby frequency band. The BPFs 12 and 13 constitute a first neighborhood frequency band signal extraction unit, and the BPFs 14 and 15 constitute a second neighborhood frequency band signal extraction unit.
Further, as shown in FIG. 3, it is preferable to use a BPF having a narrow pass bandwidth so that the desired wave BPF 11 and the BPFs 12 to 15 for detecting the interference wave do not wrap around signals other than the desired signal.

  The signal strength detection unit 16 holds the maximum value of the signal strength at a certain time of each output in the desired wave BPF 11 and the interference wave detection BPFs 12 to 15, and the held maximum value is the desired wave and the vicinity of +100 kHz, respectively. The maximum signal strength of the jamming wave, the −100 kHz jamming wave, the +200 kHz jamming wave, and the −200 kHz jamming wave is assumed (here, the maximum signal strength in each band is regarded as the signal strength of each broadcasting station). Then, on the basis of the signal strength of the desired wave, the signal strength of the nearby interference wave of ± 100 kHz and the magnitude of the signal strength of the nearby interference wave of ± 200 kHz (for example, when the signal strength of the desired wave is set to 1 The ratio of the signal strength of the nearby disturbance wave is calculated.

  The degree-of-modulation detection unit 17 calculates the average signal strength of the desired wave and each nearby jamming wave, and grasps it from the maximum signal strength of each neighboring jamming wave detected by the signal strength detection unit 16 and the calculated average signal strength. The degree of modulation of the desired wave, the interference wave near +100 kHz, the interference wave near −100 kHz, the interference wave near +200 kHz, and the interference wave near −200 kHz is calculated from the signal intensity attenuation of the desired wave and each nearby interference wave.

  Here, with regard to signal strength attenuation, in a signal with a small modulation degree, the signal strength difference between the maximum signal strength and the average signal strength is small (that is, the attenuation from the maximum signal strength to the average signal strength is small), and modulation is performed. In a signal having a large degree, there is a relationship that the signal strength difference is large between the maximum signal strength and the average signal strength (that is, the attenuation from the maximum signal strength to the average signal strength is large). The modulation degree detection unit 17 uses this relationship to calculate the modulation degree. Note that such a relationship of signal intensity attenuation is determined by the specifications of the filter used, and can be modeled in advance.

  For example, when the modulation degree of a +100 kHz disturbance wave at a certain time is close to 0 kHz, values that pass through the center of the +100 kHz BPF and the vicinity of the center continue to be output (that is, the disturbance wave frequently passes around the center frequency). ). Therefore, when the average signal strength is calculated from the output result, the maximum signal strength and the average signal strength are substantially equal. On the other hand, when the modulation degree of the +100 kHz interference wave is about 75 kHz, for example, a value that passes through a frequency region greatly deviating from the center is output in addition to the center and the vicinity of the center of the +100 kHz BPF. Therefore, when the average signal strength is calculated from the output result, there is a large signal strength difference between the maximum signal strength and the average signal strength.

  Furthermore, the modulation degree calculation in the modulation degree detection unit 17 can detect the modulation degree more accurately by considering not only the signal intensity attenuation relationship of the desired band but also the modulation degree of the nearby frequency band. It becomes. That is, it is preferable that the modulation degree of the desired wave is calculated based not only on the maximum signal intensity and the average signal intensity of the desired wave but also based on the modulation degree of the nearby interfering wave. Not only the maximum signal intensity and the average signal intensity of the interference wave, but also the modulation degree of the desired wave, and further interference waves in the vicinity of each nearby interference wave (for example, +200 kHz when the target of modulation degree calculation is a nearby interference wave of +100 kHz) It is preferable to calculate based on the degree of modulation of the nearby interference wave.

Specifically, for example, when calculating the modulation degree of a nearby disturbance wave of +100 kHz, not only the maximum signal intensity and the average signal intensity of a disturbance wave near +100 kHz, but also the modulation degree of a signal existing in a nearby frequency band, for example, It is desirable to calculate in consideration of the degree of modulation of the desired wave and the nearby interference wave of +200 kHz.
This is because the greater the degree of modulation of the desired wave or near-jamming wave of +200 kHz, the more the average signal strength increases because it wraps around the +100 kHz jamming wave band. This is because the smaller the value is, the more difficult it is to enter the interference wave band of +100 kHz, and the average signal strength decreases. Similarly, when calculating the modulation degree of the desired wave, not only the maximum signal intensity and the average signal intensity of the desired wave, but also the modulation degree of a signal existing in a nearby band, for example, a +100 kHz interference wave or a −100 kHz interference wave It is desirable to calculate in consideration of the degree of modulation of a wave, a disturbance wave near +200 kHz, or a disturbance wave near −200 kHz.

Further, for example, when calculating the modulation degree of a nearby disturbance wave of +100 kHz, in addition to the modulation degree of a signal existing in a nearby frequency band, for example, the modulation degree of a desired wave or a nearby disturbance wave of +200 kHz, a nearby frequency band It is desirable to calculate in consideration of the signal strength of a signal existing in the signal, for example, the signal strength of a desired wave or a nearby interference wave of +200 kHz.
This is because the greater the signal strength of the desired wave and the +200 kHz nearby interference wave, the greater the influence on the modulation degree of the +100 kHz nearby interference wave when the signal spills into the +100 kHz interference wave band.

  Similarly, when calculating the modulation factor of the desired wave, the modulation factor of the signal existing in the nearby band, for example, the modulation factor of the interference wave near +100 kHz or the interference wave near −100 kHz, is present in the nearby frequency band. It is desirable to calculate in consideration of the signal strength of the signal, for example, the signal strength of the interference wave near +100 kHz, the interference wave near −100 kHz, the interference wave near +200 kHz, or the interference wave near −200 kHz.

  The passband width control unit 18 receives the modulation degrees of the desired wave, the −100 kHz interference wave, the +100 kHz interference wave, the −200 kHz interference wave, and the +200 kHz interference wave from the modulation degree detection unit 17 and is set in advance. Based on the threshold determination using the threshold value, an appropriate passband width of the desired wave is determined. Specifically, for example, if the degree of modulation of each interfering wave is equal to or greater than a threshold value, the pass bandwidth is narrowed by a predetermined width, and if less than the threshold value, the pass bandwidth is widened by a predetermined width, etc. Perform the process. Furthermore, if the modulation degree of the desired wave is equal to or greater than the threshold value, the pass band width is increased by a predetermined width, and if it is less than the threshold value, the pass band width is decreased by the predetermined width.

  In addition, when determining the passband width of the desired wave, in addition to the modulation factor described above, the signal intensity of the nearby disturbance wave of ± 100 kHz and the signal intensity of the nearby disturbance wave of ± 200 kHz are used to obtain higher quality. A received signal can be provided. This is because the influence of the nearby interfering wave varies depending not only on the modulation degree of the interfering wave but also on the signal intensity of the nearby interfering wave of ± 100 kHz, the signal intensity of the nearby interfering wave of ± 200 kHz, and the frequency difference with the desired wave. This is because the optimum passband width of the desired wave differs depending on these.

In the above-described embodiment, in the output results of +100 kHz BPF and −100 kHz BPF, signals existing at both frequencies of +100 kHz and −100 kHz are detected. However, the high frequency side signal or the low frequency side signal of the desired frequency is detected. The passband width of the desired wave may be controlled using only one of the interference wave signals.
With such a configuration, it is possible to realize an interference wave detection device that detects an interference wave with respect to a desired wave and suppresses the influence of the interference wave on the desired wave.

Next, an interference wave removing device using the above-described interference wave detecting device will be described below.
An interference wave removing device for removing an interference wave from a received signal according to the present invention extracts an intermediate frequency converter 3 that converts the received signal into an intermediate frequency signal, and a desired wave that is a signal in a desired band from the intermediate frequency signal. And an interference wave detection device having an interference wave detection unit 6 that detects the interference wave and controls the pass bandwidth in the filter unit 4. The interference wave detection device has a center frequency of the desired wave. A band-pass filter is disposed in the vicinity of the frequency band, and adjacent frequency band signal extraction units 12 to 15 for detecting the maximum signal intensity and the average signal intensity of the disturbing wave passing through the band-pass filter, and the vicinity frequency band signal extraction And a pass bandwidth control unit 18 for controlling the pass bandwidth in the filter unit 4 based on the units 12 to 15.

  In addition, an interference wave removing apparatus for removing an interference wave from a received signal according to the present invention includes an intermediate frequency conversion unit 3 that converts the received signal into an intermediate frequency signal, and a desired wave that is a signal in a desired band from the intermediate frequency signal. An interference wave detection device having a filter unit 4 to be extracted and an interference wave detection unit 6 that detects the interference wave and controls the pass bandwidth in the filter unit 4, the interference wave detection device having a center of a desired wave A bandpass filter is disposed at a frequency position of the frequency, a desired frequency band signal extraction unit 11 that detects the maximum signal intensity and the average signal intensity of the desired wave that passes through the bandpass filter, and a frequency near the center frequency of the desired wave A band-pass filter is disposed at a position, and a nearby frequency band signal extraction unit 12 to 15 that detects an interference wave passing through the band-pass filter, and a desired frequency band signal extraction unit 11 And output, based on the output result of the neighboring frequency band signal extractor 12 to 15, and a passband-width control unit 18 for controlling the passband width of the filter unit 4.

  With such a configuration, it is possible to realize an interference wave removing apparatus that includes an interference wave detection device that detects an interference wave with respect to a desired wave and suppresses the influence of the interference wave on the desired wave, and removes the detected interference wave. .

DESCRIPTION OF SYMBOLS 1 Receiver 2 Antenna 3 Front end part 4 IF filter 5 Detection part 6 Interference wave detection part 11 Desired wave BPF
12 + 100kHz BPF
13-100kHz BPF
14 + 200kHz BPF
15-200kHz BPF
16 Signal strength detection unit 17 Modulation degree detection unit 18 Pass bandwidth control unit

Claims (8)

An interference wave detection device that detects an interference wave with respect to a desired wave and suppresses the influence of the interference wave on the desired wave,
A nearby frequency band signal extraction unit in which a band pass filter is disposed in the nearby frequency band of the center frequency of the desired wave;
A nearby frequency band modulation degree detecting unit for detecting the maximum signal intensity and the average signal intensity of the interference wave passing through the nearby frequency band signal extracting unit;
An interference wave detection apparatus comprising: a pass bandwidth control unit that controls a pass bandwidth of the desired wave based on an output result of the near frequency band modulation degree detection unit. A desired frequency band signal extraction unit in which a band pass filter is arranged at a center frequency position of the desired wave;
A desired wave modulation degree detection unit for detecting a maximum signal intensity and an average signal intensity of a desired wave passing through the desired frequency band signal extraction unit;
Further comprising
The passband width control unit controls the passband width of the desired wave based on an output result of the desired wave modulation degree detection unit and an output result of the neighboring frequency band modulation degree detection unit. The interference wave detection device according to claim 1. The nearby frequency band includes a first nearby frequency band that is a frequency band near the center frequency of the desired wave, and a second nearby frequency band that is a frequency band near the center frequency of the desired wave,
The nearby frequency band signal extraction unit
A first neighboring frequency band signal extracting unit in which a bandpass filter is arranged in the first neighboring frequency band; a second neighboring frequency band signal extracting unit in which a bandpass filter is arranged in the second neighboring frequency band;
Including
The vicinity frequency band modulation degree detection unit,
A first neighborhood frequency band modulation degree detection unit for detecting the maximum signal strength and the average signal strength of the interference wave passing through the first neighborhood frequency band signal extraction unit;
A second neighborhood frequency band modulation degree detection unit for detecting a modulation degree of an interference wave passing through the second neighborhood frequency band signal extraction unit;
Including
The passband width control unit controls the passband width of the desired wave based on an output result of the first neighboring frequency band modulation degree detection unit and an output result of the second neighboring frequency band modulation degree detection unit. The interference wave detecting device according to claim 1 or 2, wherein   The second neighboring frequency band modulation degree detection unit detects the maximum signal strength and the average signal strength of the interference wave passing through the second neighboring frequency band signal extraction unit, and performs interference based on the maximum signal strength and the average signal strength. The interference wave detecting device according to claim 3, wherein the degree of wave modulation is detected. An interference wave detection device that detects an interference wave with respect to a desired wave and suppresses the influence of the interference wave on the desired wave,
A desired frequency band signal extraction unit in which a band pass filter is arranged at a frequency position of the center frequency of the desired wave;
A desired wave modulation degree detection unit for detecting a maximum signal intensity and an average signal intensity of a desired wave passing through the desired frequency band signal extraction unit;
A nearby frequency band signal extraction unit in which a bandpass filter is installed in the nearby frequency band of the center frequency of the desired wave;
An interference comprising: an output result of the desired wave modulation degree detection unit; and a pass bandwidth control unit that controls a pass bandwidth of the desired wave based on an output result of the neighboring frequency band signal extraction unit Wave detector.   The interference wave detection device according to claim 5, further comprising: a nearby frequency band modulation degree detection unit that detects a modulation degree of the interference wave that passes through the nearby frequency band signal extraction unit. An interference wave removing device for removing an interference wave from a received signal,
An intermediate frequency converting unit that converts the received signal into an intermediate frequency signal, a filter unit that extracts a desired wave that is a signal in a desired band from the intermediate frequency signal, a passband in the filter unit that detects the interference wave An interference wave detection device having an interference wave detection unit for controlling the width;
The interference wave detection device is:
A nearby frequency band signal extraction unit in which a band pass filter is disposed in the nearby frequency band of the center frequency of the desired wave;
A nearby frequency band modulation degree detecting unit for detecting the maximum signal intensity and the average signal intensity of the interference wave passing through the nearby frequency band signal extracting unit;
An interference wave removing device, comprising: a pass bandwidth control unit that controls a pass bandwidth in the filter unit based on an output result of the neighboring frequency band modulation degree detection unit. An interference wave removing device for removing an interference wave from a received signal,
An intermediate frequency converting unit that converts the received signal into an intermediate frequency signal, a filter unit that extracts a desired wave that is a signal in a desired band from the intermediate frequency signal, a passband in the filter unit that detects the interference wave An interference wave detection device having an interference wave detection unit for controlling the width;
The interference wave detection device is:
A desired frequency band signal extraction unit in which a band pass filter is arranged at a frequency position of the center frequency of the desired wave;
A desired wave modulation degree detection unit for detecting a maximum signal intensity and an average signal intensity of a desired wave passing through the desired frequency band signal extraction unit;
A nearby frequency band signal extraction unit in which a band pass filter is disposed in the nearby frequency band of the center frequency of the desired wave;
An interference comprising: an output result of the desired wave modulation degree detection unit; and a pass bandwidth control unit that controls a pass bandwidth in the filter unit based on the output result of the neighboring frequency band signal extraction unit Wave removal device.

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