JP5754256B2 - Wireless receiver and squelch control method thereof - Google Patents

Description

  The present invention relates to a radio reception apparatus and its squelch control method, and more particularly to a radio reception apparatus having a band interference filter and its squelch control method.

  FIG. 9 is a block diagram of an example of a radio receiving apparatus related to the present invention. Referring to the figure, an example of a radio receiving apparatus related to the present invention includes a channel band filter 11, a reception detection circuit 12, a squelch control circuit 13, an audio signal amplifier 14, an audio signal terminal 15, and a squelch control. And a terminal 16.

  The channel band filter 11 suppresses adjacent interference waves. The reception detection circuit 12 is a reception circuit including a low noise amplifier, a mixer, and a detection circuit. The squelch control circuit 13 performs voice output control according to a received signal strength indication (RSSI) level obtained from the reception detection circuit 12. The audio signal amplifier 14 amplifies the audio signal. The audio signal terminal 15 is an audio signal output terminal. The squelch control terminal 16 is an input terminal for controlling the squelch from the outside. The squelch control circuit 13 controls ON / OFF of the audio signal amplifier 14 in accordance with the reception intensity signal level obtained from the reception detection circuit 12.

  On the other hand, as another example of a radio receiving apparatus related to the present invention, a receiver including a channel selection filter corresponding to the band interference filter of the present invention is disclosed (for example, see Patent Document 1).

  This receiver mixes the high-frequency signal input to the antenna terminal and the output signal of the local transmitter to obtain an intermediate frequency signal, a limiter amplifier that receives the intermediate frequency signal, and the output signal of the limiter amplifier. A channel selection filter as an input and a carrier sense circuit that performs a carrier sense operation according to the output signal level of the channel selection filter are provided.

  Then, when the input power of the high frequency signal of the desired channel to the antenna terminal is equal to or higher than the first input level, the carrier sense circuit is set to output a signal with a carrier, and the input power of the high frequency signal to the antenna terminal is The limiter amplifier is set to be saturated when the second input level is larger than the input level of 1 by the value of the out-of-band attenuation of the channel selection filter.

  Furthermore, as another example of the wireless receiving apparatus related to the present invention, a portable wireless terminal including a GPS band elimination filter corresponding to the band interference filter of the present invention and a bypass switch for bypassing the GPS band elimination filter is disclosed. (For example, see Patent Document 2).

  This portable wireless terminal includes a communication antenna and a GPS antenna. When GPS communication is performed during execution of wireless transmission by a communication circuit, a GPS band removal filter is connected to the path to the communication antenna by a bypass switch. Thereby, the component of the second communication band is removed from the transmission signal of the first communication band, and the transmission signal of the first communication unit is prevented from adversely affecting the second communication unit and the second antenna. .

  On the other hand, when GPS reception is not performed during execution of wireless transmission by the communication circuit, the GPS band removal filter is bypassed from the path to the communication antenna by the bypass switch.

  Furthermore, a filter switching type noise squelch circuit having a bandpass filter switching configuration is disclosed as another example of a wireless receiving apparatus related to the present invention (see, for example, Patent Document 3).

  This noise squelch circuit includes a plurality of bandpass filters with different center frequencies that can be switched as a noise filter, and based on at least one of signals indicating received electric field strength, noise level, and communication quality, a band of a required center frequency. It is configured to select a path filter.

JP 11-145859 A JP 2010-136298 A JP 2011-019050 A

  In the example of the radio reception apparatus related to the present invention shown in FIG. 9, in a reception environment affected by adjacent interference waves, in order to remove signals other than the designated reception frequency, narrowband band elimination is performed. Adjacent channel interference is suppressed by inserting a filter at the RF first stage.

  However, in order to have the performance of a narrow band and high suppression degree that are ideal for a receiver, the insertion loss tends to be large, which is one factor that deteriorates the reception sensitivity characteristic.

  In addition, while receiving a radio wave whose reception sensitivity is near the threshold, there may be a case where the carrier squelch is controlled to be invalid (open squelch) in order to continue the voice reception call that is disconnected, but this deteriorates the reception state. There is a problem of doing.

  In addition, when the channel band elimination filter is bypassed only at the squelch level, there is a problem that sound is erroneously output due to the influence of interference.

  On the other hand, the invention disclosed in Patent Document 1 is characterized in that a channel selection filter is inserted in front of a carrier sense circuit (including carrier squelch and noise squelch). This is not disclosed in Patent Document 1. Therefore, the subject of the present invention cannot be solved by the invention disclosed in Patent Document 1.

  Further, the invention disclosed in Patent Document 2 has a configuration in which the filter is bypass-controlled, and is common to the present invention in this respect. However, the invention disclosed in Patent Document 2 is not intended for squelch control, but is intended to reduce the influence of the transmission wave of the communication circuit on the GPS receiver. Therefore, the invention disclosed in Patent Document 2 has a completely different object from the present invention, and the structure for achieving the object is also completely different from the present invention. Therefore, the subject of the present invention cannot be solved by the invention disclosed in Patent Document 2.

  The invention disclosed in Patent Document 3 is common to the present invention in that it aims at preventing malfunction of the squelch circuit. However, the configuration switches a plurality of bandpass filters having different center frequencies, and is completely different from the configuration in which the bandpass filters are connected or bypassed as in the present invention. In particular, since the invention disclosed in Patent Document 3 does not have a configuration for bypassing the bandpass filter, the insertion loss of the bandpass filter cannot be made zero. Therefore, the subject of the present invention cannot be solved by the invention disclosed in Patent Document 3.

  Therefore, an object of the present invention is to prevent a decrease in reception sensitivity due to insertion of a band interference filter, a deterioration in reception state by controlling carrier squelch to be invalid (open squelch), and a malfunction of squelch due to a band interference filter bypass. And a squelch control method therefor.

  In order to solve the above-described problem, a radio reception apparatus according to the present invention includes a band interference filter that suppresses adjacent interference waves, and a squelch control unit that performs squelch release control, and the squelch control unit is interlocked with the squelch release control. The band interference filter is bypassed.

  Further, the squelch control method according to the present invention is a squelch control method in a radio reception apparatus including a band interference filter that suppresses adjacent interference waves and a squelch control unit that performs squelch release control, wherein the squelch control unit includes the squelch control unit. The band interference filter is bypassed in conjunction with opening control.

  The program according to the present invention is a program for causing the squelch control unit to execute a squelch control method in a wireless reception device including a band interference filter that suppresses adjacent interference waves and a squelch control unit that performs squelch release control. Then, the squelch control unit is configured to bypass the band interference filter in conjunction with the squelch release control.

  According to the present invention, it is possible to prevent a decrease in reception sensitivity due to insertion of a band interference filter, deterioration of a reception state by controlling carrier squelch to be invalid (open squelch), and malfunction of squelch due to band interference filter bypass. .

It is a block diagram of an example of the radio | wireless receiver which concerns on this invention. It is a figure which shows an example of the relationship between threshold value SQ1 and SQ2 of a carrier squelch level, and the RSSI value of a received signal. It is a figure which shows an example of the relationship between threshold value SQ1 and SQ2 of a carrier squelch level, and the RSSI value of a received signal. It is a figure which shows an example of an RSSI level in case an interference wave exists. It is a figure which shows an example of an RSSI level when an interference wave does not exist. It is a flowchart which shows an example of operation | movement of the squelch control method of the radio | wireless receiver which concerns on this invention. It is a flowchart which shows an example of operation | movement of the squelch control method of the radio | wireless receiver which concerns on this invention. It is a flowchart which shows an example of operation | movement of the squelch control method of the radio | wireless receiver which concerns on this invention. It is a block diagram of an example of the radio | wireless receiving apparatus relevant to this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a block diagram of an example of a radio receiving apparatus according to the present invention. Referring to the figure, an example of a wireless receiver according to the present invention includes two RF switches 1 and 2, a channel band filter 3, a reception detection circuit 4, a squelch control circuit 5, and an audio signal amplifier 6. , An audio signal terminal 7, a squelch control terminal 8, a program storage unit 9, and a memory 10.

  The RF switches 1 and 2 are switches for switching the signal path A of the channel band filter 3 and the signal path B that bypasses the channel band filter 3. The channel band filter 3 suppresses adjacent interference waves. The reception detection circuit 4 is a reception circuit including a low noise amplifier, a mixer, and a detection circuit.

  The squelch control circuit 5 performs voice output control according to a received signal strength (RSSI) level obtained from the reception detection circuit 4. The audio signal amplifier 6 amplifies the audio signal. The audio signal terminal 7 is an audio signal output terminal. The squelch control terminal 8 is an input terminal for controlling squelch from the outside. The program storage unit 9 stores a program for a squelch control method to be described later. Data is stored in the memory 10.

  RF switches 1 and 2 that switch between a signal path A that passes through the channel band filter 3 and a signal path B that does not pass through the channel band filter 3 are connected to both ends of the channel band filter 3. The switching of the RF switches 1 and 2 is performed by the squelch control circuit 5.

  Note that switching the RF switches 1 and 2 to the signal path A side passing through the channel band filter 3 is displayed as “connect the channel band filter 3”, and the RF switch is set to the signal path B side not passing through the channel band filter 3 Switching between 1 and 2 may be subsequently displayed as “bypass the channel band filter 3”.

  The squelch control circuit 5 performs squelch control using a carrier squelch using RSSI obtained by the reception detection circuit 4. 2 and 3 are diagrams showing an example of the relationship between the carrier squelch level threshold values SQ1 and SQ2 and the RSSI value of the received signal. 2 shows the channel band filter 3 connected, and FIG. 3 shows the channel band filter 3 bypassed.

Two threshold values are prepared for the carrier squelch level, SQ1 (see FIG. 2) determined according to the operating conditions and SQ2 (see FIG. 3) that can be expected to improve the RSSI level by bypassing the channel band filter 3. . The relationship between SQ1 and SQ2 when the insertion loss of the channel band filter 3 is FL is
SQ1 ≦ FL + SQ2 (1)
And That is, the SQ2 level is set to a value that can be expected by bypassing the channel band filter 3.

  When the RSSI level exceeds SQ1, the RF switches 1 and 2 are switched to the signal path A side via the channel band filter 3, and the audio signal amplifier 6 is turned on to output the received audio.

  On the other hand, when the RSSI level does not exceed SQ 1 but exceeds SQ 2, the RF switches 1 and 2 are switched to the signal path B side that bypasses the channel band filter 3.

  The RSSI level exceeding SQ2 is set to V1, and this value is stored in the memory 10 (see FIG. 1) and compared with the RSSI level V2 when the channel band filter 3 is bypassed.

  The channel band filter 3 is characterized in that the insertion loss FL of the desired wave is made as small as possible while the suppression degree of adjacent channel interference has a loss of 20 dB or more as an example.

Therefore, the RSSI level when there is no adjacent interference is before and after bypassing the channel band filter 3.
V2−V1 = FL (2)
The following relational expression holds. Note that (V2−V1) represents a difference in RSSI.

On the other hand, in the case of reception with an interference wave, from the characteristics of the previous channel band filter 3,
V2-V1> FL (3)
Thus, whether or not it is due to an interference wave can be identified by comparing the value of (V2-V1) with FL.

  Therefore, when V2−V1 = FL (see Expression 2) is established, it is determined that the desired wave is being received, and the audio signal amplifier 6 is turned on to obtain received audio. On the other hand, when V2-V1> FL (see Expression 3) is satisfied, it is determined as an interference wave or an unnecessary wave, and the audio signal amplifier 6 is maintained in the OFF state.

  That is, by providing two squelch level thresholds SQ1 and SQ2, when a sufficient reception level exceeding SQ1 is obtained, the channel band filter 3 is not bypassed in order to improve interference resistance.

The threshold value of the squelch level SQ2 is set higher than a value obtained by subtracting the loss level FL of the channel band filter 3 from the threshold value SQ1. That is,
SQ2> SQ1-FL (4)
The reception level when the channel band filter 3 is bypassed is set higher than SQ1 when the channel band filter 3 is used, so that the channel band filter 3 is used only in a reception environment that does not impair operability.

Therefore, the bypass operation of the channel band filter 3 by the squelch control is
SQ1> RSSI (at the time of filter passage: V1)> SQ2 (5)
Be limited to

  The value of the RSSI level V1 when (Equation 5) is established is stored and held in the memory 10, and the value of the RSSI level V1 and the RSSI level V2 bypassing the channel band filter 3 are compared, and V2−V1 = FL ( The signal input to the reception detection circuit 4 when Expression 2 is satisfied is determined as a signal of a desired channel, and the audio signal amplifier 6 is controlled to be turned on.

  Next, an outline of the operation of the present invention will be described. The discrimination between the interference wave and the desired wave can be described with reference to FIGS. FIG. 4 is a diagram illustrating an example of an RSSI level when an interference wave is present, and FIG. 5 is a diagram illustrating an example of an RSSI level when no interference wave is present.

  More specifically, FIG. 4 (A) shows an example of RSSI level V1 when an interference wave exists and the channel band filter 3 is connected, and FIG. 4 (B) shows an interference wave and channel band filter. 3 shows an example of the RSSI level V2 when 3 is bypassed.

  FIG. 5A shows an example of the RSSI level V1 when no interference wave exists and the channel band filter 3 is connected, and FIG. 5B shows the channel band filter 3 without the interference wave. An example of RSSI level V2 when bypassed is shown.

  4A and 4B show that when the RSSI level V1 passed through the channel band filter 3 by the interference wave F1 satisfies the condition of SQ2 <V1 <SQ1, the channel band filter 3 causes the channel band filter 3 to be bypassed. Since the suppressed loss level FL is released, the RSSI level V2 = V1 + FL is obtained.

  On the other hand, as shown in FIGS. 5A and 5B, when there is no interference wave and only the desired wave is present, the relationship between V1 that has passed through the channel band filter 3 and V2 that has been bypassed is V2 = By virtue of the expression of Vi + FL, it is possible to identify whether only a desired wave or a signal including an interference wave.

  Next, a first embodiment of the present invention will be described. Referring to FIG. 1, as an embodiment of the present invention, what is important is squelch control matched with the characteristics of the channel band filter 3. For example, the channel spacing is 25 kHz, the pass band characteristic BW of the channel band filter 3 is 10 kHz, the pass band loss FL is 6 dB, and the degree of suppression at a distance of ± 25 kHz is 30 dB or more.

Assuming that the squelch setting necessary for operation is RSSI = −100 dBm,
SQ1 = -100dBm
SQ2 ≧ SQ1-FL = −100−6 = −106 dBm
Each setting is given. The RSSI level that has passed through the channel band filter 3 is V1, and the RSSI level that bypasses the channel band filter 3 is V2.

  Under the above conditions, for example, the operation when there is an input signal of RSSI = −98 dBm is RSSI (V1) = − 98 dBm> SQ1 output from the reception detection circuit 4, so the squelch control is performed by the channel band filter. 3, the audio signal amplifier 6 is ON-controlled while the route A passing through 3 is output.

  On the other hand, when there is an input signal of RSSI = −102 dBm, RSSI (V1 = −102 dBm) output from the reception detection circuit 4 is smaller than SQ1 (−100 dBm), but larger than SQ2 (−106 dBm). In the squelch control, the value of V1 (−102 dBm) is stored in the memory 10 and switched to the path B that bypasses the channel band filter 3.

  If the RSSI (V2) at this time is a desired wave, the level is improved by FL = 6 dB, which is the assumed loss of the bandpass filter. Therefore, if V2 (−96) ≈V1 (−102) + FL (6) The audio signal amplifier 6 is turned on to output an audio signal.

  On the other hand, if the input signal is an interference wave, the RSSI increases by about 30 dB, so V2≈−102 + 30 = −72 dBm, which is far from the assumed V2≈−96 dBm. When the interference wave is determined, the RF switches 1 and 2 (see FIG. 1) are switched to the channel band filter 3 side by squelch control.

  In actual operation, since there are RSSI detection errors and input level fluctuations, the interference wave and the desired wave are separated by giving an allowable value convenient for operation, such as about ± 2 to 3 dB from the assumed level.

  Next, another embodiment of the present invention will be described. When the level of the received signal is in the vicinity of the squelch threshold, the receiver arbitrarily performs squelch opening control and may require continuous reception voice output even if there is some noise.

  At the time of such arbitrary squelch control, a mechanism linked with bypass control of the channel band filter 3 is incorporated by the same method as described above. That is, in synchronization with arbitrary squelch opening control, the channel band filter 3 is bypassed to improve the desired wave level.

  If the input signal is only the desired signal, the channel band filter 3 is bypassed when the squelch is released, and the channel band filter 3 is passed when there is an interference signal. It is also possible to change the setting depending on the operation mode, such as leaving it alone.

  Next, a second embodiment of the present invention will be described. In the previous embodiment, two threshold values of SQ1 and SQ2 are used. However, it is also possible to set a threshold value larger than SQ1, for example, SQ0, and to positively use the filter bypass by giving priority to reception with a higher S / N. It is.

  Next, a third embodiment of the present invention will be described. The audio signal amplifier 6 in FIG. 1 is an embodiment in which analog audio is simply analog-controlled, but the present invention can also be applied to digital control of digital audio. That is, as long as it is possible to suppress the audio signal when it is determined as the interference wave and to output the audio when it is determined as the desired wave, the signal handled by the audio signal amplifier 6 may be analog audio or digital audio.

  Next, an example of the operation of the squelch control method of the wireless reception device according to the present invention will be described. 6 to 8 are flowcharts showing an example of the operation of the squelch control method of the wireless receiver according to the present invention.

  The following operation is executed by the squelch control circuit 5 referring to the data in the memory 10 and controlling the RF switches 1 and 2, the reception detection circuit 4 and the audio signal amplifier 6.

  First, the squelch control circuit 5 controls the RF switches 1 and 2 to connect the channel band filter 3 to the input side of the reception detection circuit 4 (step S1). Next, the squelch control circuit 5 compares the RSSI level (V1) of the signal received by the reception detection circuit 4 with SQ1 (step S2). When RSSI (V1) exceeds SQ1 (“Y” in step S2), the squelch control circuit 5 sets the audio signal amplifier 6 to ON (step S3).

  On the other hand, when RSSI (V1) is less than SQ1 (in the case of “N” in step S2), squelch control circuit 5 compares the RSSI level (V1) of the signal received by reception detection circuit 4 with SQ1 and SQ2. (Step S4). If RSSI (V1) is less than SQ1 but exceeds SQ2 (“Y” in step S4), the squelch control circuit 5 controls the RF switches 1 and 2 to receive and detect the channel band filter 3. Bypass from the input side of the circuit 4 (step S6). Next, the squelch control circuit 5 stores the value of V1 in the memory 10 (step S7).

  Then, the squelch control circuit 5 measures the RSSI level (V2) of the signal received by the reception detection circuit 4, reads out the value of V1 from the memory 10, and calculates the difference between V2 and V1 (step S8). When the difference between V2 and V1 is equal to or smaller than FL (“Y” in step S8), the squelch control circuit 5 sets the audio signal amplifier 6 to ON (step S9).

  On the other hand, when RSSI (V1) is less than SQ2 in step S4 (in the case of “N” in step S4), the squelch control circuit 5 sets the audio signal amplifier 6 to OFF (step S5).

  On the other hand, when the difference between V2 and V1 exceeds FL in Step S8 (in the case of “N” in Step S8), the squelch control circuit 5 sets the audio signal amplifier 6 to OFF (Step S10). Then, the squelch control circuit 5 controls the RF switches 1 and 2 to connect the channel band filter 3 to the input side of the reception detection circuit 4 (step S11).

  Next, a program for the squelch control method according to the present invention will be described. The wireless receiver according to the present invention includes a program storage unit 9 (see FIG. 1). The program storage unit 9 stores a program for the squelch control method shown in the flowcharts of FIGS.

  The squelch control circuit 5 reads the program from the program storage unit 9, refers to the data in the memory 10 according to the program, and controls the RF switches 1 and 2, the reception detection circuit 4 and the audio signal amplifier 6. Since the contents of the control have already been described, the description here is omitted.

  As described above, according to the wireless reception device and the squelch control method according to the present invention, it is possible to improve reception sensitivity. This is because the loss of the bandpass filter is bypassed because the bandpass filter is bypassed in a non-interference state.

  Furthermore, according to the present invention, it is possible to suppress squelch control due to erroneous detection of interference waves. The reason is that the presence or absence of interference is determined by comparing the RSSI level when the band filter is connected and the RSSI level when the band filter is not connected. If there is interference, the voice signal amplifier is turned off and the operator side This is because no audio is output.

  A part or all of the above-described embodiment can be described as in the following supplementary notes, but is not limited thereto.

(Supplementary Note 1) The squelch control unit includes: a band interference filter that suppresses adjacent interference waves; a squelch control unit that performs squelch release control; and an audio signal amplifier that controls ON and OFF of audio by the squelch control unit. A radio receiving apparatus characterized in that when the squelch is opened, the audio signal amplifier is set ON, and when the squelch is closed, the audio signal amplifier is set OFF.

(Supplementary Note 2) A squelch control method in a radio reception apparatus including a band interference filter for suppressing adjacent interference waves and a squelch control unit that performs squelch release control, wherein the squelch control unit performs squelch control using carrier squelch. A squelch control method characterized by being performed.

(Supplementary Note 3) The wireless reception device further includes an audio signal amplifier whose ON / OFF is controlled by the squelch control unit, and the squelch control unit sets the audio signal amplifier to ON together with squelch release, The squelch control method according to appendix 2, wherein the audio signal amplifier is set to OFF together with the squelch blockage.

DESCRIPTION OF SYMBOLS 1, 2 RF switch 3 Channel band filter 4 Reception detection circuit 5 Squelch control circuit 6 Audio signal amplifier 7 Audio signal terminal 8 Squelch control terminal 9 Program storage part 10 Memory

Claims (10)

A band interference filter that suppresses adjacent interference waves of the input signal ;
Including a squelch control unit that performs squelch release control,
The squelch control unit is coupled with the squelch release control when the level of the received signal when the band interference filter is connected is near a squelch threshold and the input signal is only a desired wave. A radio receiving apparatus that bypasses a band interference filter. A band interference filter that suppresses adjacent interference waves of the input signal;
Including a squelch control unit that performs squelch release control,
The squelch control unit comprises at least two squelch opening threshold, the two squelch difference open threshold no line receiving apparatus characterized in that corresponding to the insertion loss of the band interference filter. The squelch control unit
If the two squelch opening thresholds are SQ1 and SQ2 (SQ1> SQ2),
The level (V1) of the received signal when the band interference filter is connected is not less than SQ2 and not more than SQ1, and the level (V1) of the received signal and the level (V2) of the received signal when the band interference filter is bypassed 3. The radio receiving apparatus according to claim 2, wherein when the difference is equal to a loss due to insertion of the band interference filter, it is determined that there is no adjacent interference and squelch is released. The squelch control unit
If the two squelch opening thresholds are SQ1 and SQ2 (SQ1> SQ2),
The level (V1) of the received signal when the band interference filter is connected is not less than SQ2 and not more than SQ1, and the level (V1) of the received signal and the level (V2) of the received signal when the band interference filter is bypassed 4. The radio reception apparatus according to claim 2, wherein if the difference between the two exceeds a loss due to insertion of the band interference filter, it is determined that adjacent interference exists and the squelch is blocked.   The radio reception apparatus according to claim 1, wherein the squelch control unit performs squelch control using carrier squelch. A squelch control method in a wireless reception device including a band interference filter that suppresses adjacent interference waves of an input signal and a squelch control unit that performs squelch release control,
The squelch control unit is coupled with the squelch release control when the level of the received signal when the band interference filter is connected is near a squelch threshold and the input signal is only a desired wave. A squelch control method characterized by bypassing a band interference filter. A squelch control method in a wireless reception device including a band interference filter that suppresses adjacent interference waves of an input signal and a squelch control unit that performs squelch release control,
The squelch control unit comprises at least two squelch opening threshold, the difference between the two squelch opening threshold characteristics and be away Kerch control method that corresponds to the insertion loss of the band interference filter. The squelch control unit
If the two squelch opening thresholds are SQ1 and SQ2 (SQ1> SQ2),
The level (V1) of the received signal when the band interference filter is connected is not less than SQ2 and not more than SQ1, and the level (V1) of the received signal and the level (V2) of the received signal when the band interference filter is bypassed The squelch control method according to claim 7, wherein the squelch is released by determining that there is no adjacent interference if the difference between the squelch and the band interference filter is equal to a loss due to insertion of the band interference filter. The squelch control unit
If the two squelch opening thresholds are SQ1 and SQ2 (SQ1> SQ2),
The level (V1) of the received signal when the band interference filter is connected is not less than SQ2 and not more than SQ1, and the level (V1) of the received signal and the level (V2) of the received signal when the band interference filter is bypassed 9. The squelch control method according to claim 7 or 8, wherein if the difference between the squelch exceeds a loss due to insertion of the band interference filter, the squelch is blocked by determining that adjacent interference exists. A program for causing the squelch control unit to execute a squelch control method in a wireless receiver including a band interference filter that suppresses adjacent interference waves of an input signal and a squelch control unit that performs squelch release control,
When the received signal level when the band interference filter is connected to the squelch control unit is near a squelch threshold, and the input signal is only a desired wave, the squelch release control is linked to the squelch release control. A program for bypassing a band interference filter.

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