JP4930285B2 - Receiver, squelch level setting method, program - Google Patents

Description

  The present invention relates to a receiving device having a squelch function, a squelch level setting method, and a program.

  There is a radio device having a function (hereinafter referred to as “squelch function”) for switching on or off the output of a radio signal to an audio speaker based on a voltage value (squelch intensity) of a noise signal included in the radio signal. The squelch function includes a manual squelch that manually searches for an optimum squelch intensity to remove the noise when it occurs, and a preset squelch that incorporates a circuit in which the squelch intensity is set in advance at the unit manufacturing stage. Further, as another squelch function, Patent Document 1 discloses a squelch control method for setting a squelch intensity that is switched on or off according to the intensity of an input signal.

The wireless device disclosed in Patent Document 1 measures the received signal strength at a fixed period, and when the measured received signal strength exceeds the squelch open level and exceeds the previously measured received signal strength, a fixed value is used. The hysteresis, which is the difference between a certain squelch open level and a squelch close level that is a variable value, is changed to a magnitude corresponding to the received signal strength measured this time.
In addition, when the received signal strength measured this time exceeds the squelch open level and is lower than the received signal strength measured last time but the difference is within a certain level, the hysteresis is changed to the received signal strength measured this time. Change to the corresponding size.
Japanese Patent Laid-Open No. 2002-232306

First, in manual squelch, the optimum squelch strength must be set manually, which is not only cumbersome to operate, but the user checks the squelch operation after setting to determine whether the set value is appropriate. Therefore, if the set value is not appropriate, it must be adjusted again.
Preset squelch provides a squelch intensity up to a preset level. However, if the squelch intensity is exceeded, noise will be generated immediately, and the preset setting value will not malfunction even if it changes to some extent. Thus, it is difficult to set an appropriate squelch level, such as a setting value with reduced sensitivity.
In the wireless device disclosed in Patent Document 1, the squelch close level is changed according to the received signal strength. However, if the squelch open level is set high, the sensitivity decreases, and if the squelch open level is set low, malfunctions increase and appropriate. The squelch level could not be set.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a receiving device, a squelch level setting method, and a program that can appropriately set a squelch level without requiring troublesome operations. .

In order to achieve the above object, a receiving apparatus according to the first aspect of the present invention provides:
A signal demodulating means for receiving and demodulating the modulated signal and outputting the demodulated signal;
Signal intensity measuring means for measuring the intensity of the demodulated signal output by the signal demodulating means;
Noise intensity measuring means for measuring the intensity of a noise component contained in the modulation signal;
Switch means for turning on or off the output of the demodulated signal output by the signal demodulating means;
Based on the difference between the intensity of the demodulated signal measured by the signal intensity measuring means and the intensity of the noise component measured by the noise intensity measuring means, the switch means turns on or off the output of the demodulated signal to the outside. And control means for controlling ,
The control means includes
When the difference between the intensity of the demodulated signal and the intensity of the noise component exceeds a predetermined value, the switch means turns on the output of the demodulated signal to the outside, and the intensity of the demodulated signal and the noise component When the difference from the intensity is less than a predetermined value, the switch means controls to turn off the output of the demodulated signal,
When turning on the output of the demodulated signal to the switch means, add a predetermined offset value to the intensity of the demodulated signal or subtract a predetermined offset value from the intensity of the noise component,
When the predetermined offset value is added to the intensity of the demodulated signal, and the difference between the intensity of the demodulated signal adding the predetermined offset value and the intensity of the noise component is less than a predetermined value To stop adding the predetermined offset value to the intensity of the demodulated signal,
When the predetermined offset value is subtracted from the intensity of the noise component and the difference between the intensity of the demodulated signal and the intensity of the noise component obtained by subtracting the predetermined offset value is less than a predetermined value Stop subtracting the predetermined offset value from the intensity of the noise component;
It is characterized by that.

For example, the control means counts the squelch open time from turning on the output of the demodulated signal to the switch means to turning it off,
Time comparing means for determining whether or not the squelch open time measured by the time measuring means is shorter than the first time;
Counting means for counting the number of malfunctions, which is the number of times the time comparison means discriminates within the second time when the squelch open time is shorter than the first time;
A squelch level correcting unit that subtracts a predetermined offset value from the intensity of the demodulated signal or adds a predetermined offset value to the intensity of the noise component when the number of malfunctions counted by the counting unit is greater than a threshold ; , May be provided.

For example, the squelch level correction means includes:
When the number of malfunctions counted by the counting means is smaller than a predetermined number, the first score is added to the evaluation score which is a threshold for changing the squelch level,
If the number of malfunctions counted by the counting means is greater than a predetermined number, the second score is subtracted from the evaluation score;
When the evaluation score is higher than the third score, a predetermined offset value is subtracted from the intensity of the noise component,
When the evaluation score is lower than the fourth score, a predetermined offset value may be added to the intensity of the noise component.

For example, the squelch level correction means includes:
When the number of malfunctions counted by the counting means is smaller than a predetermined number, the first score is added to the evaluation score which is a threshold for changing the squelch level,
If the number of malfunctions counted by the counting means is greater than a predetermined number, the second score is subtracted from the evaluation score;
When the evaluation score is higher than the third score, a predetermined offset value is added to the intensity of the demodulated signal,
When the evaluation score is lower than the fourth score, a predetermined offset value may be subtracted from the intensity of the demodulated signal.

  For example, squelch level adjusting means for adding or subtracting an arbitrary offset value to the intensity of the demodulated signal or the intensity of the noise component may be further provided.

The squelch level setting method according to the second aspect of the present invention includes:
A signal demodulation step of receiving and demodulating the modulated signal and outputting the demodulated signal;
A signal intensity measurement step for measuring the intensity of the demodulated signal output in the signal demodulation step;
A noise intensity measurement step for measuring the intensity of a noise component included in the modulation signal;
A switch step for turning on or off the output to the outside of the demodulated signal output by the signal demodulation step,
Based on the difference between the intensity of the demodulated signal measured at the signal intensity measuring step and the intensity of the noise component measured at the noise intensity measuring step, the output of the demodulated signal at the switch step is turned on or off. and a control step, the controlling as,
In the control step,
When the difference between the intensity of the demodulated signal and the intensity of the noise component exceeds a predetermined value, the output of the demodulated signal at the switch step is turned on, and the intensity of the demodulated signal and the noise component are turned on. Control to turn off the output of the demodulated signal at the switch step when the difference with the intensity of the switch is less than a predetermined value,
When the output to the outside of the demodulated signal in the switch step is turned on, the predetermined offset value is added to the intensity of the demodulated signal or the predetermined offset value is subtracted from the intensity of the noise component,
When the predetermined offset value is added to the intensity of the demodulated signal, and the difference between the intensity of the demodulated signal adding the predetermined offset value and the intensity of the noise component is less than a predetermined value To stop adding the predetermined offset value to the intensity of the demodulated signal,
When the predetermined offset value is subtracted from the intensity of the noise component and the difference between the intensity of the demodulated signal and the intensity of the noise component obtained by subtracting the predetermined offset value is less than a predetermined value Stop subtracting the predetermined offset value from the intensity of the noise component;
It is characterized by that.

For example, in the control step, a time measuring step of measuring a squelch open time from turning on the output of the demodulated signal in the switch step to turning it off,
A time comparison step for determining whether or not the squelch open time measured in the time measuring step is shorter than the first time;
A counting step of counting the number of malfunctions, which is the number of times the squelch open time is shorter than the first time, the number of times determined in the second time in the time comparison step;
A squelch level correcting step of subtracting a predetermined offset value from the intensity of the demodulated signal or adding a predetermined offset value to the intensity of the noise component when the number of malfunctions counted in the counting step is greater than a threshold value And may be provided.

The program according to the third aspect of the present invention is:
A computer comprising: a signal demodulating unit that receives and demodulates a modulated signal and outputs a demodulated signal; and a switch unit that turns on or off the output of the demodulated signal output by the signal demodulating unit.
Signal intensity measuring means for measuring the intensity of the demodulated signal output by the signal demodulating means;
Noise intensity measuring means for measuring the intensity of a noise component contained in the modulation signal;
And when the difference between the intensity of the demodulated signal and the intensity of the noise component exceeds a predetermined value, the switch means turns on the output of the demodulated signal to the outside, and the intensity of the demodulated signal and the noise When the difference between the intensity of the component is less than a predetermined value, the switch means controls to turn off the output of the demodulated signal,
When turning on the output of the demodulated signal to the switch means, add a predetermined offset value to the intensity of the demodulated signal or subtract a predetermined offset value from the intensity of the noise component,
When the predetermined offset value is added to the intensity of the demodulated signal, and the difference between the intensity of the demodulated signal adding the predetermined offset value and the intensity of the noise component is less than a predetermined value To stop adding the predetermined offset value to the intensity of the demodulated signal,
When the predetermined offset value is subtracted from the intensity of the noise component and the difference between the intensity of the demodulated signal and the intensity of the noise component obtained by subtracting the predetermined offset value is less than a predetermined value Control means for stopping subtraction of the predetermined offset value from the intensity of the noise component;
It is made to function as.

For example, a computer
A timing means for timing a squelch open time from when the control means turns on the output of the demodulated signal to the switch means until it is turned off;
Time comparing means for determining whether or not the squelch open time measured by the time measuring means is shorter than the first time;
And a counting means for counting the number of malfunctions, which is the number of times the time comparison means has discriminated within the second time when the squelch open time is shorter than the first time,
A squelch level correcting means for subtracting a predetermined offset value from the intensity of the demodulated signal or adding a predetermined offset value to the intensity of the noise component when the number of malfunctions counted by the counting means is greater than a threshold ;
It may be made to function as.

According to the receiving apparatus of the present invention, it is possible to appropriately set the squelch level with respect to changes in the operating environment and the space situation without manually adjusting the squelch level with an adjustment knob or the like.
In addition, since there is no need for an adjustment knob, it is possible to save space on the functional panel surface.

(First embodiment)
Hereinafter, the receiving device 100 according to the first embodiment of the present invention will be described. The receiving apparatus 100 receives and demodulates the modulated signal, and outputs the demodulated signal as an audio signal.
The receiving apparatus 100 opens and closes the squelch based on the intensity of the received signal and the intensity of noise included therein.
The receiving apparatus 100 optimizes the opening / closing of the squelch by detecting a malfunction in the opening / closing of the squelch.

  As shown in FIG. 1, the receiving apparatus 100 includes an antenna 101, a demodulation circuit 102, a first BPF (Band-Pass Filter) 103, a switch 104, an audio speaker 105, a second BPF 106, a detector 107, An A / D converter 108, an A / D converter 109, a control unit 110, a storage unit 111, a display unit 112, and an operation unit 113 are included.

  The demodulation circuit 102 demodulates the modulated signal received via the antenna 101 and supplies the demodulated signal to the first BPF 103, the second BPF 106, and the A / D converter 109.

  A first BPF (Band-Pass Filter) 103 passes only a signal in a predetermined frequency band corresponding to the frequency of the audio signal in the demodulated signal supplied from the demodulation circuit 102 and supplies the signal to the switch 104. Signals with other frequencies are attenuated.

  The switch 104 switches on and off the output of the demodulated signal supplied from the first BPF 103 to the audio speaker 105 under the control of the control unit 110. Hereinafter, turning on the switch 104 will be described as opening the squelch, and turning off the switch 104 will be described as closing the squelch.

  The audio speaker 105 outputs the demodulated signal supplied from the switch 104 as an audio signal.

  A second BPF (Band-Pass Filter) 106 passes only a signal in a predetermined frequency band corresponding to the frequency of the noise signal in the demodulated signal supplied from the demodulation circuit 102 and supplies the signal to the detector 107. Signals with other frequencies are attenuated.

  The detector 107 rectifies the noise signal supplied from the second BPF 106 from alternating current to direct current, and supplies the rectified noise signal to the A / D converter 108.

  The A / D converter 108 converts the noise signal supplied from the detector 107 from an analog signal to a digital signal and supplies it to the control unit 110. Note that the noise signal supplied to the control unit 110 is represented by 8 bits.

  The A / D converter 109 converts the demodulated signal (hereinafter referred to as RSSI signal) supplied from the demodulation circuit 102 from an analog signal to a digital signal, and supplies the digital signal to the control unit 110. Note that an RSSI (Received Signal Strength Indicator) signal indicating the strength of the received signal supplied to the control unit 110 is represented by 8 bits.

The control unit 110 is configured by a CPU (Central Processing Unit), and controls the entire receiving apparatus 100 according to a program stored in the storage unit 111.
For example, the control unit 110 opens and closes the squelch based on the RSSI signal voltage and the noise signal voltage.
Further, the receiving apparatus 100 increases or decreases the offset value of the noise signal by detecting a malfunction in the opening and closing of the squelch, and optimizes the opening and closing of the squelch.

  The storage unit 111 includes a nonvolatile memory such as a flash memory, a RAM (Random Access Memory), and the like, and functions as a work memory of the control unit 110. The storage unit 111 stores an operation program of the control unit 110, squelch setting information 111a as shown in FIG. Details of the operation program will be described later.

  As shown in FIG. 2, the squelch setting information 111a includes an RSSI offset value item that is an offset value added to the RSSI signal voltage value and a noise offset value item that is an offset value added to the noise signal voltage value. , A malfunction determination time item for determining whether or not the squelch opening and closing is a malfunction, a malfunction measurement time item that is a time for measuring malfunction, and the number of times that malfunctions were considered in the squelch opening and closing It consists of a malfunction count item and a malfunction count threshold value for changing the noise offset value.

For example, if the RSSI offset value of the squelch setting information 111a is “2”, the control unit 110 adds the offset value “2” to the RSSI signal voltage value.
For example, if the noise offset value of the squelch setting information 111a is “1”, the control unit 110 adds the offset value “1” to the noise signal voltage value.
For example, if the malfunction determination time of the squelch setting information 111a is “5 msec”, the controller 110 is a time when the squelch is open, that is, a time when the switch 104 is turned on (hereinafter, squelch open time). It is determined that a malfunction has occurred when the value is “5 msec” or less.
For example, if the malfunction measurement time of the squelch setting information 111a is “20 sec”, the controller 110 counts the number of malfunctions (number of malfunctions) during “20 sec”.
For example, when the control unit 110 detects a malfunction in opening and closing of the squelch, “1” is added to the number of malfunctions.
For example, if the malfunction count threshold value of the squelch setting information 111a is “2”, the control unit 110 adds “1” to the noise offset value when the malfunction count is “2” or more.

  Note that the squelch setting information 111a can be changed according to a request through the operation unit 113 of the user.

  The display unit 112 includes a dot matrix type LCD (liquid crystal display) panel, a driver circuit, and the like, and displays an arbitrary image necessary for operation.

  The operation unit 113 includes various keys or buttons for the user to input instructions and data, and inputs various instructions and data to the control unit 110.

  The operation of receiving apparatus 100 having the above configuration will be described below.

  First, an example of a series of processes for opening and closing the squelch in the receiving apparatus 100 will be described with reference to the graph shown in FIG.

  When the power is turned on, the receiving apparatus 100 receives and demodulates the modulated signal and starts outputting the demodulated signal. The receiving apparatus 100 opens the squelch when the RSSI signal voltage becomes equal to or higher than the noise signal voltage, and sets the RSSI offset value from “0” to “2”. Then, when the RSSI signal voltage having the RSSI offset value “2” becomes less than the noise signal voltage, the squelch is closed and the RSSI offset value is set from “2” to “0”.

  The receiving apparatus 100 simultaneously detects a malfunction related to the opening / closing of the squelch and changes the noise offset value according to the number of malfunctions.

  The receiving apparatus 100 measures the squelch open time, and determines that it is malfunctioning when the squelch open time is shorter than the malfunction determination time. Then, the receiving apparatus 100 counts the number of malfunctions, which is the number of malfunctions determined within the malfunction measurement time, and adds “1” to the noise offset value when the malfunction count is greater than the malfunction count threshold.

  Next, each process actually performed by the receiving apparatus 100 will be described with reference to flowcharts shown in FIGS. Each process shown in FIGS. 4 and 5 is executed using a time division process.

  First, the squelch opening / closing process performed by the receiving apparatus 100 will be described. In brief, the receiving apparatus 100 opens and closes the squelch based on the magnitude of the RSSI signal voltage and the noise signal voltage.

  Hereinafter, the squelch opening / closing process will be described in detail with reference to the flowchart shown in FIG. Note that the RSSI offset value and the noise offset value are preset to “0” when the power is turned on.

  When the power is turned on, the control unit 110 of the receiving apparatus 100 determines whether or not the RSSI signal voltage is equal to or higher than the noise signal voltage (step S11).

  When it is determined that the RSSI signal voltage is equal to or higher than the noise signal voltage (S11; YES), the control unit 110 sets the RSSI offset value of the squelch setting information 111a to “2” (step S12), and opens the squelch (step S13). ), The process returns to step S11.

  If it is determined that the RSSI signal voltage is less than the noise signal voltage (S11; NO), the control unit 110 sets the RSSI offset value of the squelch setting information 111a to “0” (step S14), and closes the squelch (step S15). ), The process returns to step S11.

  In this way, according to the squelch opening / closing process, the receiving apparatus 100 can open / close the squelch based on the magnitude of the RSSI signal voltage and the noise signal voltage. Further, by adding an offset value to the RSSI signal voltage while the squelch is open, a hysteresis characteristic can be provided, and so-called fluttering that the squelch opens and closes in a short time can be prevented.

Next, the squelch correction process performed by the receiving apparatus 100 will be described. In brief, the receiving apparatus 100 determines that a malfunction has occurred when the squelch open time is less than or equal to the malfunction determination time. Then, the number of times of malfunction occurring within the malfunction measurement time is counted, and the noise offset value is changed according to the number of times. The degree of opening and closing of the squelch can be changed by changing the noise offset value.
Here, in general, when transmission is performed by voice communication, it is considered that the time required for the information transmission, that is, the time required for transmission, transmission, and return to reception is approximately 1 second or more. Even if the RSSI signal voltage and the noise signal voltage satisfy the condition for opening the squelch, if the duration of the condition is very short, the signal desired to be received is not received. It is possible to judge that the squelch level currently set is appropriate by measuring this as a malfunction and measuring the number of malfunctions within the malfunction measurement time. In this case, an appropriate squelch level can be set by performing a squelch correction process.

  Hereinafter, the squelch correction process will be described in detail with reference to the flowchart shown in FIG. The squelch correction process is periodically executed.

  First, the control unit 110 of the receiving apparatus 100 sets the number of malfunctions in the squelch setting information 111a to “0” (step S101). Then, the control unit 110 starts measuring the malfunction measurement time described in the squelch setting information 111a.

  The control unit 110 determines whether or not the squelch is open (step S102).

  If it is determined that the squelch is closed (S102; NO), the controller 110 advances the process to step S107.

  When it is determined that the squelch is open (S102; YES), the control unit 110 determines whether or not the squelch is closed after starting the squelch open time measurement (step S103).

  When it is determined that the squelch is open (S103; NO), the control unit 110 determines whether or not the malfunction measurement time has elapsed (step S105).

  If it is determined that the malfunction measurement time has elapsed (S105; YES), the controller 110 advances the process to step S108.

  If it is determined that the malfunction measurement time has not elapsed (S105; NO), the control unit 110 returns the process to step S103.

  If it is determined that the squelch is closed (S103; YES), the control unit 110 determines whether or not the squelch open time, which is the time from when the squelch is opened in step S102 until the squelch is closed in step S103, is equal to or less than the malfunction determination time. Is determined (step S104).

  If it is determined that the squelch open time is equal to or shorter than the malfunction determination time (S104; YES), the control unit 110 adds “1” to the number of malfunctions in the squelch setting information 111a (step S106), and the process proceeds to step S107.

  If it is determined that the squelch open time is longer than the malfunction determination time (S104; NO), the control unit 110 advances the process to step S107.

  In step S107, the control unit 110 determines whether or not the malfunction measurement time has elapsed (step S107).

  If it is determined that the malfunction measurement time has not elapsed (S107; NO), the control unit 110 returns the process to step S102.

  If it is determined that the malfunction measurement time has elapsed (S107; YES), the control unit 110 determines whether or not the malfunction count of the squelch setting information 111a is equal to or greater than the malfunction count threshold (step S108).

  If it is determined that the number of malfunctions is equal to or greater than the malfunction count threshold (S108; YES), the control unit 110 adds “1” to the noise offset value of the squelch setting information 111a (step S109), and ends the process.

  If it is determined that the number of malfunctions is less than the malfunction count threshold (S108; NO), the controller 110 ends the process.

  Thus, according to the squelch correction process, the receiving apparatus 100 can detect a malfunction based on the squelch open time, count the number of malfunctions, and change the noise offset value based on the number of malfunctions. The squelch can be made difficult to open by changing the noise offset value.

  As described above, the receiving device 100 according to the first embodiment of the present invention opens and closes the squelch based on the magnitude of the RSSI signal voltage and the noise signal voltage. Further, while the squelch is open, a hysteresis characteristic can be provided by adding an offset value to the RSSI signal voltage. Further, it is possible to detect a malfunction, change the offset value to the noise signal voltage based on the number of times, and change the degree of opening and closing of the squelch.

(Second Embodiment)
In the first embodiment, the receiving device 100 changes the offset value to the noise signal voltage based on the relationship between the number of malfunctions and the threshold value. However, in the second embodiment, the score is deducted based on the number of malfunctions. Alternatively, points may be added and the offset value to the noise signal voltage may be changed based on the score.

  The configuration of the receiving apparatus according to the second embodiment is the same as that of the first embodiment. However, the storage unit 111 stores not the squelch setting information 111a but the squelch setting information 111b.

  As shown in FIG. 6, the squelch setting information 111b includes an RSSI offset value item that is an offset value added to the RSSI signal voltage value and a noise offset value item that is an offset value added to the noise signal voltage value. , A malfunction determination time item for determining whether the opening / closing of the squelch is a malfunction, a malfunction measurement time item for measuring malfunction, and a malfunction measurement count item for performing malfunction measurement , A measurement frequency item that is the number of times of malfunction measurement, a measurement interval item that is a malfunction measurement interval, a malfunction count item that is the number of times a malfunction was considered in the opening / closing of the squelch, and an evaluation described later There are two malfunction threshold values for changing points, an evaluation score item, two points for adding or subtracting points according to the number of malfunctions, And two items of evaluation points threshold for changing the offset value, and a.

For example, if the RSSI offset value of the squelch setting information 111b is “2”, the control unit 110 adds the RSSI offset value “2” to the RSSI signal voltage value.
For example, if the noise offset value of the squelch setting information 111b is “1”, the control unit 110 adds the noise offset value “1” to the noise signal voltage value.
For example, if the malfunction determination time of the squelch setting information 111b is “5 msec”, the control unit 110 determines that the time when the squelch is open, that is, the time when the switch 104 is turned on (hereinafter, the squelch open time) is “ It is determined that a malfunction has occurred when the time is 5 msec or less.
For example, if the malfunction measurement time of the squelch setting information 111b is “30 sec”, the controller 110 counts the number of malfunctions during “30 sec”.
For example, when the control unit 110 detects a malfunction in opening and closing of the squelch, “1” is added to the number of malfunctions.
For example, if the malfunction count threshold 1 of the squelch setting information 111b is “2”, the control unit 110 adds the score set to the score 1 to the evaluation score when the malfunction count is “2” or more. In this embodiment, since the score 1 is “−2”, “2” is subtracted from the evaluation score.
For example, if the malfunction count threshold 2 of the squelch setting information 111b is “1”, the control unit 110 adds the score set to the score 2 to the evaluation score when the malfunction count is “1”. In this embodiment, since the score 2 is “1”, “1” is added to the evaluation score.
For example, the control unit 110 adds / subtracts a score to the evaluation score according to the number of malfunctions.
For example, if the evaluation score threshold 1 of the squelch setting information 111b is “−2”, the control unit 110 adds “1” to the noise offset value when the evaluation score is “−2” or less.
For example, if the evaluation score threshold 2 of the squelch setting information 111b is “5”, the control unit 110 subtracts “1” from the noise offset value when the evaluation score is “5” or more.

  The squelch setting information 111b can be changed in response to a request through the user operation unit 113.

  Hereinafter, the operation of the receiving apparatus 100 according to the second embodiment will be described. The squelch opening / closing process is the same as that in the first embodiment. Each process is performed by time-sharing processing. When the receiving apparatus 100 is turned on, the RSSI offset value, noise offset value, number of measurements, number of malfunctions, and evaluation point are preset to “0”.

  First, the evaluation score deriving process performed by the receiving apparatus 100 will be described. In brief, the receiving apparatus 100 adds / subtracts evaluation points according to the number of malfunctions.

  Hereinafter, the evaluation point deriving process will be described in detail with reference to the flowchart shown in FIG. The evaluation score deriving process is periodically executed.

  First, the control unit 110 of the receiving device 100 sets the number of malfunctions and the number of measurements in the squelch setting information 111b to “0” (step S201).

  The control unit 110 determines whether or not the squelch is open after starting the measurement of the malfunction measurement time and the measurement interval described in the squelch setting information 111b (step S202).

  If it is determined that the squelch is closed (S202; NO), the control unit 110 advances the process to step S207.

  When it is determined that the squelch is open (S202; YES), the control unit 110 determines whether or not the squelch is closed after starting the squelch open time measurement (step S203).

  If it is determined that the squelch is open (S203; NO), the control unit 110 determines whether or not the malfunction measurement time has elapsed (step S205).

  If it is determined that the malfunction measurement time has elapsed (S205; YES), the controller 110 advances the process to step S208.

  If it is determined that the malfunction measurement time has not elapsed (S205; NO), the control unit 110 returns the process to step S203.

  If it is determined that the squelch is closed (S203; YES), the control unit 110 determines whether the squelch open time, which is the time from when the squelch is opened in step S202 until the squelch is closed in step S203, is equal to or less than the malfunction determination time. Is determined (step S204).

  If it is determined that the squelch open time is less than or equal to the malfunction determination time (S204; YES), the control unit 110 adds “1” to the number of malfunctions in the squelch setting information 111b (step S206), and the process proceeds to step S207.

  If it is determined that the squelch open time is longer than the malfunction determination time (S204; NO), the control unit 110 advances the process to step S207.

  In step S207, the control unit 110 determines whether or not the malfunction measurement time has elapsed (step S207).

  If it is determined that the malfunction measurement time has not elapsed (S207; NO), the control unit 110 returns the process to step S202.

  If it is determined that the malfunction measurement time has elapsed (S207; YES), the control unit 110 determines whether or not the malfunction count of the squelch setting information 111b is equal to or greater than the malfunction count threshold 1 (step S208).

  If it is determined that the number of malfunctions is equal to or greater than the malfunction count threshold 1 (S208; YES), the controller 110 adds 1 to the evaluation score of the squelch setting information 111b (step S209). Here, “−2” set as a score of 1 is added to the evaluation score.

  Next, the control unit 110 adds “1” to the number of measurements of the squelch setting information 111b (step S212), and advances the process to step S213.

  If it is determined that the number of malfunctions is less than the malfunction count threshold 1 (S208; NO), the controller 110 determines whether the malfunction count is equal to the malfunction count threshold 2 (step S210).

  If it is determined that the number of malfunctions is equal to the malfunction count threshold 2 (S210; YES), the control unit 110 adds 2 to the evaluation score (step S211), and adds “1” to the number of measurements of the squelch setting information 111b. (Step S212), the process proceeds to Step S213. Here, “1” set as a score of 2 is added to the evaluation score.

  If it is determined that the number of malfunctions is not equal to the malfunction count threshold 2 (S210; NO), the control unit 110 adds “1” to the number of measurements of the squelch setting information 111b (step S212), and the process proceeds to step S213.

  In step S213, the control unit 110 determines whether or not the number of measurements has reached the number of malfunction measurements (step S213).

  When it is determined that the number of measurement times has reached the number of malfunction measurement times (S213; YES), the control unit 110 ends the process.

  If it is determined that the measurement count has not reached the malfunction measurement count (S213; NO), the control unit 110 waits until the measurement interval elapses, and sets the malfunction count of the squelch setting information 111b to “0” when the measurement interval elapses. Initialization (step S214), and the process returns to step S202.

  In this way, according to the evaluation point deriving process, it is possible to derive a score corresponding to the number of malfunctions.

  Next, the squelch correction process performed by the receiving apparatus 100 will be described. In brief, the receiving apparatus 100 increases or decreases the noise offset value based on the magnitude of the evaluation point and the threshold value.

  Hereinafter, the squelch correction process will be described in detail with reference to the flowchart shown in FIG. The squelch correction process is periodically executed.

  First, the control unit 110 of the receiving device 100 determines whether or not the evaluation score of the squelch setting information 111b is equal to or less than the evaluation score threshold 1 (step S301).

  If it is determined that the evaluation score is equal to or less than the evaluation score threshold 1 (S301; YES), the control unit 110 adds “1” to the noise offset value of the squelch information 111b and ends the process.

  If it is determined that the evaluation score is larger than the evaluation score threshold 1 (S301; NO), the control unit 110 determines whether or not the evaluation score is equal to or higher than the evaluation score threshold 2 (step S303).

  When it is determined that the evaluation score is equal to or higher than the evaluation score threshold 2 (S303; YES), the control unit 110 subtracts “1” from the noise offset value of the squelch information 111b, and ends the process.

  When it is determined that the evaluation score is less than the evaluation score threshold 2 (S303; NO), the control unit 110 ends the process.

  In this way, according to the evaluation point deriving process and the squelch correction process, the evaluation point can be added or subtracted according to the number of malfunctions, and the noise offset value can be changed according to the evaluation point. By adopting such a method, the squelch opening / closing can be automatically corrected appropriately.

  In addition, this invention is not limited to the said embodiment, A various deformation | transformation and application are possible.

  In the above embodiment, the receiving apparatus adds the predetermined offset value to the RSSI signal when the squelch is open. However, the receiving apparatus may subtract the predetermined offset value from the noise signal.

  In the first embodiment, the receiving apparatus adds a predetermined value to the offset value of the noise signal when the number of malfunctions is equal to or greater than a threshold value. However, the receiving apparatus may subtract the predetermined value from the offset value of the RSSI signal. .

  In the second embodiment, the receiving apparatus adds a predetermined value to the offset value of the noise signal when the evaluation score is equal to or lower than the threshold value, and adds the predetermined value to the offset value of the noise signal when the evaluation score is equal to or higher than the threshold value. Although the subtraction is performed, a predetermined value may be subtracted from the offset value of the RSSI signal when the evaluation score is equal to or lower than the threshold value, and the predetermined value may be added to the offset value of the RSSI signal when the evaluation score is equal to or higher than the threshold value.

  Moreover, you may enable it to change the offset value of an RSSI signal and / or a noise signal by a user operating via an operation part.

  Various numerical values used in the above embodiment are arbitrary, and other specific details can be changed as appropriate.

  Note that the receiving apparatus according to the present invention can be realized using a normal computer system, not a dedicated system. For example, in a computer having a function of receiving and demodulating a radio signal, a program for executing the above operation is stored in a recording medium (flexible disk, CD-ROM, DVD-ROM, etc.) readable by the computer system. The receiving apparatus that executes the above-described processing may be configured by distributing the program and installing the program in a computer system. Alternatively, the receiving device may be configured by storing the program in a storage of a server device on a communication network such as the Internet and downloading the program by a normal computer system.

  Further, when the above-described function is realized by sharing between an OS (Operating System) and an application, or by cooperation between the OS and the application, only the application portion may be stored in a recording medium or storage.

It is a block diagram of the receiver which concerns on the 1st Embodiment of this invention. It is a table | surface for demonstrating the squelch setting information in 1st Embodiment. It is a figure for demonstrating operation | movement of a receiver. It is a flowchart for demonstrating a squelch opening / closing process. It is a flowchart for demonstrating the squelch correction process in 1st Embodiment. It is a table | surface for demonstrating the squelch setting information in 2nd Embodiment. It is a flowchart for demonstrating the evaluation score derivation process in 2nd Embodiment. It is a flowchart for demonstrating the squelch correction process in 2nd Embodiment.

Explanation of symbols

100 receiving apparatus 101 antenna 102 demodulating circuit 103 first BPF
104 switch 105 audio speaker 106 second BPF
Reference Signs List 107 detector 108 A / D converter 109 A / D converter 110 control unit 111 storage unit 111a squelch setting information 111b squelch setting information 112 display unit 113 operation unit

Claims (9)

A signal demodulating means for receiving and demodulating the modulated signal and outputting the demodulated signal;
Signal intensity measuring means for measuring the intensity of the demodulated signal output by the signal demodulating means;
Noise intensity measuring means for measuring the intensity of a noise component contained in the modulation signal;
Switch means for turning on or off the output of the demodulated signal output by the signal demodulating means;
Based on the difference between the intensity of the demodulated signal measured by the signal intensity measuring means and the intensity of the noise component measured by the noise intensity measuring means, the switch means turns on or off the output of the demodulated signal to the outside. And control means for controlling ,
The control means includes
When the difference between the intensity of the demodulated signal and the intensity of the noise component exceeds a predetermined value, the switch means turns on the output of the demodulated signal to the outside, and the intensity of the demodulated signal and the noise component When the difference from the intensity is less than a predetermined value, the switch means controls to turn off the output of the demodulated signal,
When turning on the output of the demodulated signal to the switch means, add a predetermined offset value to the intensity of the demodulated signal or subtract a predetermined offset value from the intensity of the noise component,
When the predetermined offset value is added to the intensity of the demodulated signal, and the difference between the intensity of the demodulated signal adding the predetermined offset value and the intensity of the noise component is less than a predetermined value To stop adding the predetermined offset value to the intensity of the demodulated signal,
When the predetermined offset value is subtracted from the intensity of the noise component and the difference between the intensity of the demodulated signal and the intensity of the noise component obtained by subtracting the predetermined offset value is less than a predetermined value Stop subtracting the predetermined offset value from the intensity of the noise component;
A receiving apparatus. Time counting means for timing the squelch open time from when the control means turns on the output of the demodulated signal to the switch means until it is turned off;
Time comparing means for determining whether or not the squelch open time measured by the time measuring means is shorter than the first time;
Counting means for counting the number of malfunctions, which is the number of times the time comparison means discriminates within the second time when the squelch open time is shorter than the first time;
A squelch level correcting unit that subtracts a predetermined offset value from the intensity of the demodulated signal or adds a predetermined offset value to the intensity of the noise component when the number of malfunctions counted by the counting unit is greater than a threshold ; Comprising
The receiving apparatus according to claim 1 . The squelch level correcting means includes
When the number of malfunctions counted by the counting means is smaller than a predetermined number, the first score is added to the evaluation score which is a threshold for changing the squelch level,
If the number of malfunctions counted by the counting means is greater than a predetermined number, the second score is subtracted from the evaluation score;
When the evaluation score is higher than the third score, a predetermined offset value is subtracted from the intensity of the noise component,
A predetermined offset value is added to the intensity of the noise component when the evaluation score is lower than the fourth score;
The receiving device according to claim 2 . The squelch level correcting means includes
When the number of malfunctions counted by the counting means is smaller than a predetermined number, the first score is added to the evaluation score which is a threshold for changing the squelch level,
If the number of malfunctions counted by the counting means is greater than a predetermined number, the second score is subtracted from the evaluation score;
When the evaluation score is higher than the third score, a predetermined offset value is added to the intensity of the demodulated signal,
A predetermined offset value is subtracted from the intensity of the demodulated signal when the evaluation score is lower than the fourth score;
The receiving device according to claim 2 . It further comprises a squelch level adjusting means for adding or subtracting an arbitrary offset value to the intensity of the demodulated signal or the intensity of the noise component.
Receiving apparatus according to any one of claims 1 to 4, characterized in that. A signal demodulation step of receiving and demodulating the modulated signal and outputting the demodulated signal;
A signal intensity measurement step for measuring the intensity of the demodulated signal output in the signal demodulation step;
A noise intensity measurement step for measuring the intensity of a noise component included in the modulation signal;
A switch step for turning on or off the output to the outside of the demodulated signal output by the signal demodulation step,
Based on the difference between the intensity of the demodulated signal measured at the signal intensity measuring step and the intensity of the noise component measured at the noise intensity measuring step, the output of the demodulated signal at the switch step is turned on or off. and a control step, the controlling as,
In the control step,
When the difference between the intensity of the demodulated signal and the intensity of the noise component exceeds a predetermined value, the output of the demodulated signal at the switch step is turned on, and the intensity of the demodulated signal and the noise component are turned on. Control to turn off the output of the demodulated signal at the switch step when the difference with the intensity of the switch is less than a predetermined value,
When the output to the outside of the demodulated signal in the switch step is turned on, the predetermined offset value is added to the intensity of the demodulated signal or the predetermined offset value is subtracted from the intensity of the noise component,
When the predetermined offset value is added to the intensity of the demodulated signal, and the difference between the intensity of the demodulated signal adding the predetermined offset value and the intensity of the noise component is less than a predetermined value To stop adding the predetermined offset value to the intensity of the demodulated signal,
When the predetermined offset value is subtracted from the intensity of the noise component and the difference between the intensity of the demodulated signal and the intensity of the noise component obtained by subtracting the predetermined offset value is less than a predetermined value Stop subtracting the predetermined offset value from the intensity of the noise component;
A squelch level setting method characterized by that. In the control step, a time measuring step of measuring a squelch open time from turning on the output of the demodulated signal in the switch step to turning it off,
A time comparison step for determining whether or not the squelch open time measured in the time measuring step is shorter than the first time;
A counting step of counting the number of malfunctions, which is the number of times the squelch open time is shorter than the first time, the number of times determined in the second time in the time comparison step;
A squelch level correcting step of subtracting a predetermined offset value from the intensity of the demodulated signal or adding a predetermined offset value to the intensity of the noise component when the number of malfunctions counted in the counting step is greater than a threshold value And comprising
The squelch level setting method according to claim 6 . A computer comprising: a signal demodulating unit that receives and demodulates a modulated signal and outputs a demodulated signal; and a switch unit that turns on or off the output of the demodulated signal output by the signal demodulating unit.
Signal intensity measuring means for measuring the intensity of the demodulated signal output by the signal demodulating means;
Noise intensity measuring means for measuring the intensity of a noise component contained in the modulation signal;
And when the difference between the intensity of the demodulated signal and the intensity of the noise component exceeds a predetermined value, the switch means turns on the output of the demodulated signal to the outside, and the intensity of the demodulated signal and the noise When the difference between the intensity of the component is less than a predetermined value, the switch means controls to turn off the output of the demodulated signal,
When turning on the output of the demodulated signal to the switch means, add a predetermined offset value to the intensity of the demodulated signal or subtract a predetermined offset value from the intensity of the noise component,
When the predetermined offset value is added to the intensity of the demodulated signal, and the difference between the intensity of the demodulated signal adding the predetermined offset value and the intensity of the noise component is less than a predetermined value To stop adding the predetermined offset value to the intensity of the demodulated signal,
When the predetermined offset value is subtracted from the intensity of the noise component and the difference between the intensity of the demodulated signal and the intensity of the noise component obtained by subtracting the predetermined offset value is less than a predetermined value Control means for stopping subtraction of the predetermined offset value from the intensity of the noise component;
A program characterized by functioning as Computer
A timing means for timing a squelch open time from when the control means turns on the output of the demodulated signal to the switch means until it is turned off;
Time comparing means for determining whether or not the squelch open time measured by the time measuring means is shorter than the first time;
And a counting means for counting the number of malfunctions, which is the number of times the time comparison means has discriminated within the second time when the squelch open time is shorter than the first time,
A squelch level correcting means for subtracting a predetermined offset value from the intensity of the demodulated signal or adding a predetermined offset value to the intensity of the noise component when the number of malfunctions counted by the counting means is greater than a threshold ;
9. The program according to claim 8 , wherein the program is made to function as:

Images