JP6326831B2 - Wireless receiver and reception frequency setting method used therefor - Google Patents

Description

  The present invention relates to a radio receiver including a spectrum analyzer and a reception frequency setting method for setting a reception frequency using the spectrum analyzer.

  The wireless receiver includes a tuning knob for adjusting the reception frequency of radio waves. The user rotates the tuning knob so as to be tuned to a desired reception frequency, and receives sound transmitted by radio waves having the set reception frequency.

JP 2000-352569 A JP 2004-347320 A

  There is a wireless receiver equipped with a spectrum analyzer that displays the received signal strength of a predetermined frequency band. The user can visually find a transmission signal of another user's call that seems to be receivable by the received signal strength displayed by the spectrum analyzer.

  Therefore, it is convenient if the reception frequency can be set using a spectrum analyzer instead of setting the reception frequency by rotating the tuning knob. There is a need for a radio receiver that can easily set a radio wave reception frequency using a spectrum analyzer and a reception frequency setting method used therefor.

  In order to meet such a demand, an object of the present invention is to provide a radio receiver capable of easily setting a radio wave reception frequency using a spectrum analyzer and a reception frequency setting method used therefor.

The present invention provides a signal strength storage unit that stores signal strength data obtained by measuring signal strengths of input signals of a plurality of frequencies within a predetermined frequency band at predetermined time intervals, and is stored in the signal strength storage unit. The display unit displays the latest signal strength data in a spectrum, the touch sensor disposed on the display unit, and the signal strength data indicating the signal strength stored in the signal strength storage unit is smoothed to obtain smoothed data. A smoothing unit for generating a peak frequency, a peak frequency detecting unit for detecting a frequency at a position showing a local maximum value in the smoothed data closest to the frequency indicated by the touch position detected by the touch sensor as a peak frequency, and used for a call a call reception section that receives a signal of the frequency, when the radio mode in the call reception unit is set to SSB mode, the peak Comprising a frequency offset unit for generating a peak offset frequency was predetermined offset frequency offset wave number, and a reception frequency determination section that determines the receiving frequency of the radio wave received by the call reception section based on the peak offset frequency A wireless receiver is provided.
Further, the present invention is a spectrum analyzer for receiving radio waves of each of a plurality of frequencies within a predetermined frequency band, measuring received signal strength, and displaying the received signal strength of each of the plurality of frequencies on a display unit, The touch sensor disposed on the display unit, the smoothing unit that smoothes the signal strength data indicating the received signal strength of each of the plurality of frequencies to generate smoothed data, and the touch position detected by the touch sensor A peak frequency detection unit that detects a frequency at a position showing a local maximum value in the smoothed data as a peak frequency, a call reception unit that receives a signal of a frequency used for a call, and a radio wave mode in the call reception unit When the SSB mode is set, the peak frequency is offset by a predetermined offset frequency. Providing a frequency offset unit for generating a preparative frequency, a radio receiver, characterized in that it comprises a reception frequency determination section that determines the receiving frequency of the radio wave received by the call reception section based on the peak offset frequency .

Furthermore, the present invention is a method for setting a reception frequency of a call receiver in a radio receiver, wherein the signal strength of each input signal of a plurality of frequencies within a predetermined frequency band is measured at a predetermined time interval. The intensity data is stored in the signal intensity storage unit, the latest signal intensity data stored in the signal intensity storage unit is displayed as a spectrum on a display unit equipped with a touch sensor, and the signal intensity stored in the signal intensity storage unit Smoothing data to generate smoothed data, detecting the frequency of the position showing the maximum value in the smoothed data closest to the frequency indicated by the touch position detected by the touch sensor as a peak frequency, and receiving the call When the radio wave mode in is set to SSB mode, the peak frequency is offset by a predetermined offset frequency. It generates offset frequency, to provide a receiving frequency setting method characterized by determining the receiving frequency of the radio wave received by the call reception section based on the peak offset frequency.

  According to the wireless receiver of the present invention and the reception frequency setting method used therefor, it is possible to easily set the reception frequency of radio waves using a spectrum analyzer.

It is a block diagram which shows the radio receiver of one Embodiment. It is an external appearance front view showing the radio receiver of one embodiment. It is a figure for demonstrating the wave frequency band used by AM mode, LSB mode in SSB mode, and USB mode in SSB mode. It is a figure which shows an example of the received signal strength displayed on a spectrum analyzer. It is a block diagram which shows the partial detailed structure of one Embodiment shown in FIG. It is a wave form diagram for demonstrating the example of the smoothing process in the smoothing part 102 shown in FIG. It is a figure which shows the spectrum of the smoothing data produced | generated by the smoothing part 102 shown in FIG. FIG. 6 is a waveform diagram for explaining an offset of a peak frequency in the frequency offset unit 104 shown in FIG. 5. It is a flowchart which shows one Embodiment of the operation | movement of the wireless receiver of one Embodiment, and a receiving frequency setting method.

  Hereinafter, a radio receiver according to an embodiment and a reception frequency setting method used therefor will be described with reference to the accompanying drawings. FIG. 1 shows a wireless transceiver 100 that is a wireless receiver according to an embodiment.

  In FIG. 1, the control unit 10 controls the entire radio transceiver 100. The antenna 11 receives radio waves and supplies a received signal to the signal strength measurement receiving unit 12 and the call receiving unit 17. The signal strength measurement receiving unit 12 sequentially changes the reception frequency of radio waves within a predetermined frequency band, and sequentially receives signals of the respective reception frequencies. The frequency band is 50 kHz, for example.

  The signal strength measuring unit 13 measures the received signal strength of each reception frequency. For example, the signal strength measuring unit 13 measures the received signal strength at 640 reception frequencies in the frequency band 50 kHz every 125 ms. The signal strength data indicating the received signal strength measured by the signal strength measuring unit 13 is temporarily stored in the signal strength storage unit 14. The signal strength data is supplied to the control unit 10.

  As will be described later, the signal strength storage unit 14 stores not only the latest signal strength data but also signal strength data of a past predetermined time. For example, the signal strength storage unit 14 stores the signal strength data for 3 seconds including the latest signal strength data.

  The call transmitter 15 modulates the audio signal from the microphone 16 and transmits it from the antenna 11. The call receiver 17 receives a signal having a frequency used for a call. The call receiving unit 17 demodulates a signal having a selected reception frequency among the reception signals from the antenna 11. The speaker 18 outputs the sound demodulated by the call receiving unit 17.

  In the case of one-way communication, only one of the call transmission unit 15 and the call reception unit 17 operates and the other does not operate based on control by the control unit 10.

  There are various modes such as an AM (Amplitude Modulation) mode, an SSB (Single Side Band) mode, and an FM (Frequency Modulation) mode as radio wave modes used by the radio transceiver 100 for transmitting and receiving audio signals. The radio wave mode used in the present embodiment is assumed to be one of the AM mode, the SSB mode, and the FM mode.

  The user can change the reception frequency in the call receiver 17 by rotating the tuning knob 20 leftward or rightward. The rotation amount of the tuning knob 20 in the left direction or the right direction is encoded by the encoder 19 and is replaced with a change amount of the reception frequency. The control unit 10 changes the reception frequency in the call reception unit 17 in accordance with the amount of change in the reception frequency from the encoder 19. The call receiver 17 tunes to the changed reception frequency.

  The wireless transceiver 100 includes a touch panel 22. As will be described in detail later, in the present embodiment, in addition to the setting of the reception frequency by the tuning knob 20, the reception frequency in the call receiving unit 17 can be set by the user touching the touch panel 22. Has been.

  The touch panel 22 includes a liquid crystal display unit 221 and a touch sensor 222 disposed on the liquid crystal display unit 221. Here, the display unit is a so-called liquid crystal panel, but any display unit such as an organic EL panel or a cathode ray tube can be used. As the touch sensor 222, any type of touch sensor such as a resistive film type or a capacitance type can be used.

  The control unit 10 supplies the latest signal strength data among the signal strength data supplied from the signal strength storage unit 14 to the liquid crystal drive unit 21. The liquid crystal driving unit 21 has a frame buffer 210. The signal strength data is temporarily held in the frame buffer 210. The liquid crystal drive unit 21 drives the liquid crystal display unit 221 so that the signal intensity data held in the frame buffer 210 is displayed on the liquid crystal display unit 221.

  The liquid crystal drive unit 21 has a character generator that causes the liquid crystal display unit 221 to display characters, figures, and the like.

  The control unit 10, the signal strength measuring unit 13, the signal strength storage unit 14, and the liquid crystal driving unit 21 constitute a spectrum analyzer that displays the received signal strength in a predetermined frequency band.

  FIG. 2 is an example of an external front view of the wireless transceiver 100. The touch panel 22 displays the received signal strength of a predetermined frequency band while being updated to the latest received signal strength every 125 ms.

  Returning to FIG. 1, when the user touches the touch panel 22, the contact detection unit 23 detects where the user touches the touch sensor 222. In the present embodiment, the contact detector 23 only needs to detect the horizontal position of the touch panel 22 shown in FIG. The position information detected by the contact detection unit 23 is supplied to the control unit 10.

  The operating frequency storage unit 24 is set by the tuning knob 20 or the touch panel 22 and stores a reception frequency used for receiving radio waves in the call receiving unit 17. When the transmission frequency used for radio wave transmission in the call transmission unit 15 is different from the reception frequency, the operation frequency storage unit 24 also stores the transmission frequency. The offset frequency storage unit 25 stores an offset frequency described later.

  An operation unit 26 is connected to the control unit 10. The operation unit 26 includes a mode selection unit 260 for selecting a radio wave mode.

  As illustrated in FIG. 2, the operation unit 26 includes, for example, a plurality of buttons and knobs provided below the touch panel 22. The mode selection unit 260 selects an AM mode, an SSB mode, and an FM mode, and selects an LSB (Lower Side Band) mode and a USB (Upper Side Band) mode when the SSB mode is selected. A selection button 262.

  In the SSB mode, the LSB mode is used when the frequency is 9.5 MHz or less, and the USB mode is used when the frequency exceeds 9.5 MHz. Instead of selecting the LSB mode and the USB mode with the selection button 262, the LSB mode and the USB mode may be automatically selected according to the frequency.

  Each radio wave mode is demonstrated using (a)-(c) of FIG. FIG. 3A conceptually shows the frequency band used in the AM mode. In the AM mode, the entire carrier frequency component Ccw located at the carrier frequency fc, the lower side LSB on the low frequency side with respect to the carrier frequency component Ccw, and the upper side USB on the high frequency side are used. The carrier frequency fc corresponds to the reception frequency.

  FIG. 3B conceptually shows the frequency band used in the LSB mode in the SSB mode. In the LSB mode, only the lower side wave LSB is used. In the LSB mode, since only the lower side wave LSB is extracted by the filter and other band components are removed, the carrier frequency component Ccw does not exist.

  FIG. 3C conceptually shows the frequency band used in the USB mode in the SSB mode. In the USB mode, only the upper wave USB is used. In the USB mode, since only the upper side wave USB is extracted by the filter and other band components are removed, the carrier frequency component Ccw does not exist.

  In FIG. 1, when the AM mode is selected by the mode selection unit 260, the control unit 10 causes the offset frequency storage unit 25 to store 0 as the offset frequency. When the SSB mode is selected by the mode selection unit 260, the control unit 10 causes the offset frequency storage unit 25 to store, for example, 500 Hz as the offset frequency.

  The offset frequency when the SSB mode is selected is not limited to 500 Hz. You may make it select the offset frequency at the time of selecting SSB mode with the operation part 26 from several frequency.

  In the radio transceiver 100 configured as described above, a reception frequency setting method for setting a reception frequency using a spectrum analyzer will be described. When the user touches the position of the frequency to be tuned within the frequency band displayed on the touch panel 22 with his / her finger, the control unit 10 sets the reception frequency in the call receiving unit 17 as follows. The frequency corresponding to the position touched with is set.

  FIG. 4 shows received signal strength in a 50 kHz band from 7.0500000 MHz to 7.100 000 MHz as an example of a frequency band displayed on the spectrum analyzer (touch panel 22). On the touch panel 22, a marker 22M indicating the position of the currently selected reception frequency is displayed. In FIG. 4, a grid not shown in FIG. 2 is displayed on the touch panel 22.

  First, the operation when the SSB mode is selected will be described.

  The received signal strength at each frequency of 640 locations displayed on the touch panel 22 shows a plurality of maximum values. The position showing the maximum value is the frequency at which the lower side wave LSB or the upper side wave USB exists. The frequency at which the local maximum value is located is a frequency at which another user can transmit and receive an audio signal.

  As illustrated in FIG. 4, it is assumed that the user selects one of a plurality of maximum values and touches the frequency position where the maximum value is located on the touch panel 22. The finger has a predetermined area, and the resolution of the touch sensor 222 is not fine enough to accurately identify 640 locations on the touch panel 22 in the horizontal direction. Therefore, it is difficult to directly indicate the frequency that the user wants to select using the touch panel 22.

  As described above, the received signal strength displayed on the touch panel 22 is an instantaneous value every 125 ms. The frequency of the maximum value displayed on the touch panel 22 varies depending on how other users speak. Therefore, the signal strength storage unit 14 preferably stores signal strength data of a past predetermined time.

  In the present embodiment, the signal strength data for the past 3 seconds including the latest signal strength data is stored. The past one second may be set, and the past predetermined time may be set as appropriate. It is preferable that the control unit 10 determines the reception frequency using the signal intensity data of a past predetermined time.

  As shown in FIG. 5, the signal strength storage unit 14 is set with addresses for storing signal strength data of 24 rows L1 to L24 each having 640 points P1 to P640.

  The signal strength data of instantaneous values every 125 ms at the respective frequencies of 640 locations displayed on the touch panel 22 are written in order from the row L1 to the row L24. When the signal strength data is written in the row L24, the latest signal strength data is written in the oldest row L1. Thereafter, similarly, the latest signal strength data is overwritten on the oldest signal strength data, and the signal strength data is updated.

  The signal strength storage unit 14 can be configured by a RAM (Random Access Memory). The signal strength storage unit 14 may be configured by a shift register having 24 rows and 640 columns.

  The control unit 10 includes an average value unit 101, a smoothing unit 102, a peak frequency detection unit 103, a frequency offset unit 104, a reception frequency determination unit 105, and a writing unit 106 as functional configurations.

  The latest signal strength data stored in the signal strength storage unit 14 is input to the writing unit 106. The writing unit 106 writes the latest signal strength data into the frame buffer 210. Therefore, the latest received signal strength updated every 125 ms is displayed on the touch panel 22.

  The signal strength data for the past 3 seconds stored in the signal strength storage unit 14 is input to the averaging unit 101. When the user inputs position information indicating the contact position of the touch panel 22 from the contact detection unit 23, the averaging unit 101 averages the signal intensity data at 640 points P1 to P640. Instead of inputting the position information, the average value unit 101 may simply be notified that the user has touched the touch panel 22. The averaged data of 640 points of P1 to P640 is defined as Pav1 to Pav640. Averaged data Pav1 to Pav640 generated by the averaging unit 101 is input to the smoothing unit 102.

  The smoothing unit 102 smoothes the input averaged data Pav1 to Pav640 so that the change in the received signal strength is smooth.

  An example of the smoothing process in the smoothing unit 102 will be described with reference to (a) and (b) of FIG. FIG. 6A is an example of averaged data output from the averager 101. The averaged data Pav1, Pav2, Pav3, Pav4... Are 0, 4, 7, 11,.

  As an example, in the case of smoothing using five points, the smoothing unit 102 newly calculates the average value of the center point (smoothed data) of a total of five points each of the two left and right points of the center point to be smoothed. And

  In the averaged data Pav1 located on the leftmost side in FIG. 6A and the averaged data Pav2 located on the right side thereof, there are no two points on the left side, so an average value of five points cannot be obtained. . Therefore, smoothing data is obtained from the smoothing unit 102 from the third averaged data Pav3 from the left. The smoothed data corresponding to the averaged data Pav3, Pav4, Pav5... Is Psm3, Psm4, Psm5.

  As shown in FIG. 6B, in the averaged data Pav3, 7 which is a value obtained by adding 0, 4, 7, 11, 13 and dividing by 5 is the smoothed data Psm3. In the averaged data Pav4, 10.2, which is a value obtained by adding 4, 7, 11, 13, 16 and dividing by 5, becomes the smoothed data Psm4.

  Similarly, when the averaged data Pav3, Pav4, Pav5... In FIG. 6A is smoothed, the smoothed data Psm3, Psm4, Psm5... The waveform is as shown.

When an arbitrary point in the averaged data in FIG. 6A is n, a calculation formula for obtaining the smoothed data Psm (n) at the arbitrary point n is the following formula (1).
Psm (n) = {Pav (n-2) + Pav (n-1) + Pav (n) + Pav (n + 1) + Pav (n + 2)} / 5 (1)

  In the equation (1), in order to obtain the smoothed data Psm (n), five points of data in the averaged data are used. The two points on the left side of the five central points for which the smoothed data Psm (n) is obtained may be smoothed using the already obtained smoothed data instead of the averaged data.

  In the fifth averaged data Pav5 from the left in FIG. 6A, the smoothed data Psm3 is 7 for the averaged data Pav3 which is the left two points, and the smoothed for the averaged data Pav4. The converted data Psm4 is 10.2. Therefore, instead of adding 1, 7, 13, 13, 16, 15 and dividing by 5 to 12.4 as the smoothed data Psm5, add 7, 10.2, 13, 16, 15 12.2 that is a value divided by 5 may be used as the smoothed data Psm5.

  Similarly, when smoothing is performed using the smoothed data as two points on the left side of the center point for which the smoothed data Psm (n) is to be obtained, a waveform indicated by a broken line in FIG. 6B is obtained. In this way, the smoothed data becomes smoother.

Instead of the equation (1), the smoothed data Psm (n) may be obtained by the following equation (2) using a weighted average of five points.
Psm (n) = {Pav (n-2) + Pav (n-1) × 2 + Pav (n) × 3 + Pav (n + 1) × 2 + Pav (n + 2)} / 9 (2)

  In Expression (2), since the center point is weighted, each local maximum value is maintained as compared with the case where Expression (1) is used. Therefore, the smoothing using Expression (2) is not as smooth as the smoothing using Expression (1). Since the expression (1) is smoother smooth data, the expression (1) is preferable.

  The smoothing process in the smoothing unit 102 is not limited to the smoothing using the five points described above. Smoothing using three points, seven points, or more points may be used. As the number of points used for smoothing increases, the smoothed data becomes smoother. The number of points used for smoothing may be set as appropriate. As described above, smoothing using a plurality of points in the frequency direction is preferable, but smoothing may be performed in the time direction by taking a sufficient time for averaging each point. Smoothing in the time direction may be included in the smoothing referred to in this embodiment.

  Returning to FIG. 5, the smoothed data generated by the smoothing unit 102 is input to the peak frequency detection unit 103. The position information of the contact position where the user touched the touch panel 22 from the contact detection unit 23 is input to the peak frequency detection unit 103.

  FIG. 7 shows the spectrum of the smoothed data generated by the smoothing unit 102 in the band from 7.0500000 MHz to 7.100000 MHz. The vertical axis in FIG. 7 is the signal strength of the smoothed data. FIG. 7 is not displayed on the touch panel 22.

  In FIG. 7, it is assumed that the contact position where the user touches the touch panel 22 is detected by the contact detection unit 23 as Ptch, and position information indicating the contact position Ptch is input to the peak frequency detection unit 103. As shown in FIG. 7, the peak frequency detection unit 103 detects a frequency indicating a maximum value closest to the contact position Ptch in each of a high frequency direction and a low direction with respect to the frequency indicated by the contact position Ptch. The frequency that exhibits the maximum value is referred to as a peak frequency.

  The peak frequency in the direction where the frequency is higher than the frequency indicated by the contact position Ptch is fpU, and the peak frequency in the direction where the frequency is lower than the frequency indicated by the contact position Ptch is fpL. The peak frequency detection unit 103 determines the peak frequency fp that is closer to the frequency indicated by the contact position Ptch from the peak frequency fpU and the peak frequency fpL. In FIG. 7, the peak frequency detector 103 determines the peak frequency fpU as the peak frequency fp.

  By detecting the peak frequency fpU and the peak frequency fpL and selecting the one closer to the frequency indicated by the contact position Ptch, the peak frequency fp closest to the frequency indicated by the contact position Ptch can be obtained.

  Since the peak frequency detection unit 103 obtains the peak frequency fp based on the smoothed data generated by the smoothing unit 102, the peak frequency fp can be easily obtained. The peak frequency fp is input to the frequency offset unit 104.

  When the mode selection unit 260 selects the LSB mode, the frequency offset unit 104 stores the offset frequency stored in the offset frequency storage unit 25 at the peak frequency fp, as shown in FIG. Is added. Specifically, the frequency offset unit 104 adds 500 Hz to the peak frequency fp.

  In order to receive the lower side wave LSB shown in FIG. 3B by the call receiving unit 17, it is necessary to set the reception frequency to the carrier frequency fc. As shown in FIG. 8A, a frequency in the vicinity of the carrier frequency fc can be obtained by obtaining a frequency obtained by shifting the peak frequency fp in the higher frequency direction by 500 Hz.

  When the mode selection unit 260 selects the USB mode, the frequency offset unit 104 stores the offset frequency stored in the offset frequency storage unit 25 from the peak frequency fp, as shown in FIG. Is subtracted. Specifically, the frequency offset unit 104 subtracts 500 Hz from the peak frequency fp.

  In order to receive the upper wave USB shown in FIG. 3C by the call receiving unit 17, it is necessary to set the reception frequency to the carrier frequency fc. As shown in FIG. 8B, a frequency in the vicinity of the carrier frequency fc can be obtained by obtaining a frequency obtained by shifting the peak frequency fp by 500 Hz in the lower frequency direction.

  As described above, in the SSB mode, since the carrier frequency component Ccw does not exist, the carrier frequency fc cannot be obtained directly. The peak frequency fp of the lower side wave LSB or the upper side wave USB can be obtained, and the carrier frequency fc can be obtained indirectly based on the peak frequency fp.

  Note that even if the peak frequency fp is shifted by 500 Hz, it does not always coincide with the carrier frequency fc. Further, there is a case where the sound quality is improved by shifting by a frequency other than 500 Hz. Therefore, it is preferable that the offset frequency when the SSB mode is selected can be selected from a plurality of frequencies by the operation unit 26.

  The frequency offset unit 104 supplies a peak offset frequency fpo obtained by offsetting the peak frequency fp by the offset frequency to the reception frequency determining unit 105.

  In many cases, the frequency at which the carrier frequency fc is located is predetermined. For example, the carrier frequency fc is set every 500 Hz. Therefore, the reception frequency determination unit 105 preferably rounds the frequency f of less than 1 kHz at the peak offset frequency fpo according to the following rule.

0 ≦ f <250: 0 Hz
250 ≦ f <750: 500 Hz
750 ≦ f <1000: 1000 Hz

  By rounding the frequency f of less than 1 kHz at the peak offset frequency fpo according to the above rule, the frequency closest to the peak offset frequency fpo and the carrier frequency fc can be set.

  The reception frequency determination unit 105 determines, as the final reception frequency, a frequency obtained by rounding the frequency f less than 1 kHz at the peak offset frequency fpo to 0, 500, or 1000 according to the above rule. The reception frequency determination unit 105 supplies the determined reception frequency to the call reception unit 17.

  Next, an operation when the AM mode or the FM mode is selected will be described.

  As shown in FIG. 3A, in the AM mode, there is a carrier frequency component Ccw located at the carrier frequency fc. The signal strength of the carrier frequency component Ccw is larger than the signal strength of the lower side wave LSB and the upper side wave USB. Therefore, the user can touch the vicinity of the position of the carrier frequency component Ccw on the touch panel 22. If the vicinity of the position of the carrier frequency component Ccw is touched, the peak frequency detection unit 103 detects the peak frequency fp of the carrier frequency component Ccw. The peak frequency fp of the carrier frequency component Ccw is substantially the carrier frequency fc.

  In the FM mode, the carrier frequency component Ccw is only the carrier frequency component Ccw at the time of no modulation as in the AM mode, but the frequency of the carrier frequency component Ccw is shifted symmetrically from the carrier frequency fc due to the modulation. The frequency shift is determined by the degree of modulation (modulation volume in the case of audio modulation). For this reason, the peak of the smoothed spectrum data of the FM signal modulated with sound is substantially the carrier frequency fc.

  When the AM mode or FM mode is selected by the mode selection unit 260, the offset frequency stored in the offset frequency storage unit 25 is zero. The frequency offset unit 104 supplies the peak frequency fp as it is to the reception frequency determination unit 105 without offsetting the peak frequency fp.

  Similarly, the reception frequency determination unit 105 determines, as the final reception frequency, a frequency obtained by rounding the frequency f less than 1 kHz at the peak frequency fp to 0, 500, or 1000 according to the above rule. The reception frequency determination unit 105 supplies the determined reception frequency to the call reception unit 17.

  When the reception frequency is determined as described above, the liquid crystal drive unit 21 moves the marker 22M on the touch panel 22 shown in FIG. 4 to the newly set reception frequency position.

  By the way, as a display mode of the spectrum analyzer, there is a mode in which the marker 22M indicating the reception frequency is always positioned at the center of the touch panel 22 in the horizontal direction. In this mode, instead of moving the marker 22M, the frequency band to be displayed on the touch panel 22 may be shifted so that the newly set reception frequency becomes the center in the horizontal direction.

  The operation of the wireless transceiver 100 and the reception frequency setting method will be described again using the flowchart of FIG.

  In FIG. 9, the control unit 10 determines whether or not position information indicating the contact position of the touch panel 22 is input in step S <b> 1. If the position information is input (YES), the control unit 10 shifts the process to step S2. If position information is not input (NO), the control unit 10 repeats the process of step S1.

  In step S2, the control unit 10 averages the signal intensity data of the past predetermined time. Although step S2 is not essential, it is preferable to provide step S2. In step S3, the control unit 10 smoothes the averaged data. When step S2 is not provided, the control unit 10 smoothes the signal strength data in step S3.

  In step S4, the control unit 10 detects the peak frequency fp closest to the contact position. In step S5, the control unit 10 determines whether the radio wave mode in the call receiving unit 17 is set to the SSB mode. If the SSB mode is set (YES), the control unit 10 shifts the process to step S6. If the SSB mode is not set (NO), the control unit 10 shifts the process to step S9.

  In step S6, the control unit 10 determines whether or not the LSB mode is set. If the LSB mode is set (YES), the control unit 10 calculates the peak offset frequency fpo by adding the offset frequency to the peak frequency fp in step S7. If the LSB mode is not set (NO), the control unit 10 calculates the peak offset frequency fpo by subtracting the offset frequency from the peak frequency fp in step S8.

  In step S9, the control unit 10 rounds a frequency less than 1 kHz of the peak offset frequency fpo in the SSB mode, and rounds a frequency less than 1 kHz of the peak frequency fp in the AM mode or the FM mode to determine a reception frequency. In step S10, the control unit 10 sets the reception frequency in the call receiving unit 17 and ends the process.

  In the example illustrated in FIG. 9, when position information indicating the touch position of the touch panel 22 is input, the signal intensity data is averaged by the averaging unit 101 and the averaged data Pav1 to Pav640 are smoothed by the smoothing unit 102. ing. In this way, the averaging unit 101 and the smoothing unit 102 may be operated only when the user touches the touch panel 22.

  Of course, regardless of whether or not the user touches the touch panel 22, the averaging unit 101 and the smoothing unit 102 are operated, and when the user touches the touch panel 22, the peak frequency detection unit 103 detects the peak frequency. May be.

  The present invention is not limited to the embodiment described above, and various modifications can be made without departing from the scope of the present invention.

10 Control unit (spectrum analyzer)
13 Signal strength measurement unit (spectrum analyzer)
14 Signal strength storage (spectrum analyzer)
17 Call receiver 21 Liquid crystal drive (spectrum analyzer)
22 Touch Panel 100 Wireless Transceiver 101 Average Value Unit 102 Smoothing Unit 103 Peak Frequency Detection Unit 104 Frequency Offset Unit 105 Reception Frequency Determination Unit 222 Touch Sensor

Claims (5)

A signal strength storage unit for storing signal strength data obtained by measuring signal strengths of input signals of a plurality of frequencies in a predetermined frequency band at predetermined time intervals;
A display unit for displaying the latest signal strength data stored in the signal strength storage unit in a spectrum;
A touch sensor disposed on the display unit;
A smoothing unit that smoothes signal strength data indicating the signal strength stored in the signal strength storage unit to generate smoothed data;
A peak frequency detection unit that detects a frequency of a position indicating a maximum value in the smoothed data closest to the frequency indicated by the touch position detected by the touch sensor as a peak frequency;
A call receiver for receiving a signal of a frequency used for a call;
A frequency offset unit that generates a peak offset frequency by offsetting the peak frequency by a predetermined offset frequency when the radio wave mode in the call receiver is set to SSB mode;
A reception frequency determination unit that determines a reception frequency of radio waves received by the call reception unit based on the peak offset frequency;
A radio receiver comprising: A spectrum analyzer that receives radio waves of each of a plurality of frequencies within a predetermined frequency band, measures received signal strength, and displays the received signal strength of each of the plurality of frequencies on a display unit;
A touch sensor disposed on the display unit;
A smoothing unit that smoothes signal strength data indicating received signal strength of each of the plurality of frequencies to generate smoothed data;
A peak frequency detection unit for detecting a frequency of a position indicating a maximum value in the smoothed data closest to the contact position detected by the touch sensor as a peak frequency;
A call receiver for receiving a signal of a frequency used for a call;
A frequency offset unit that generates a peak offset frequency by offsetting the peak frequency by a predetermined offset frequency when the radio wave mode in the call receiver is set to SSB mode;
A reception frequency determination unit that determines a reception frequency of radio waves received by the call reception unit based on the peak offset frequency;
Radio receiver comprising: a. The reception frequency determination unit rounds the peak offset frequency to a frequency closest to the peak offset frequency where a radio wave carrier frequency is located, and determines the rounded frequency as the reception frequency. The radio receiver according to 1 or 2. A reception frequency setting method for a call receiver in a wireless receiver,
Measuring the signal strength of each input signal of a plurality of frequencies within a predetermined frequency band at a predetermined time interval and storing the signal strength data in the signal strength storage unit;
The latest signal strength data stored in the signal strength storage unit is displayed in a spectrum on a display unit including a touch sensor,
Smoothing the signal strength data stored in the signal strength storage unit to generate smoothed data;
Detecting the frequency of the position indicating the maximum value in the smoothed data closest to the frequency indicated by the contact position detected by the touch sensor as a peak frequency;
When the radio wave mode in the call receiver is set to SSB mode, the peak frequency is offset by a predetermined offset frequency to generate a peak offset frequency,
A reception frequency setting method, comprising: determining a reception frequency of a radio wave received by the call receiver based on the peak offset frequency. 5. The reception frequency setting according to claim 4, wherein the peak offset frequency is rounded to a frequency at which a radio wave carrier frequency is located closest to the peak offset frequency, and the rounded frequency is determined as the reception frequency. Method.