JP2008288657A - Reception device, transmission and reception device, and receiving method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reception device capable of improving user's operability. <P>SOLUTION: The reception device has a receiving means (receiving circuit 30) of receiving a signal, a filter means (band-limiting filter 11) of passing a predetermined band component of the signal received by the receiving means, a playback means (speaker 50) of playing back the signal passed by the filter means, a tuning means (adaptive filter 12) of tuning the reception frequency of the receiving means to a predetermined frequency, and an adjusting means (filter characteristic switching processing unit) of adjusting band characteristics of the filter means when the tuning by the tuning means is completed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a receiving device, a transmitting / receiving device, and a receiving method.

  Conventionally, in order to communicate with a partner station in a CW (Continuous Wave) communication mode in a wireless device, it is necessary to match (tune) the frequency of the partner station with the frequency of the own station. As a method of executing this at high speed with a simple configuration, there are techniques disclosed in Patent Document 1 and Patent Document 2.

  As a technique for selecting a desired characteristic from a plurality of filter characteristics having different bandwidths in a receiver having a band limit filter, the band limit filter is a digital band limit filter with switchable filter coefficients. There is a technique disclosed in. According to such a technique, a radio operator can select a passband of a digital filter as necessary, thereby reducing interference signals or noise existing around a target signal (received signal). It is possible to eliminate out-of-band and increase the clarity of the target signal.

  In recent years, these technologies described above are used for CW communication. Wireless devices equipped with both of these technologies are also on the market.

  FIG. 7 is a configuration example of a wireless device using the technology disclosed in Patent Document 1 or Patent Document 2. The wireless device shown in FIG. 7 includes a DSP 100, an MPU 110, a receiving circuit 120, a frequency synthesizer 130, and a speaker 140. The DSP 100 includes an adaptive filter 101.

  Here, the input signal is input to the receiving circuit 120. The receiving circuit 120 receives a predetermined frequency signal supplied from the frequency synthesizer 130 and performs a receiving process on the input signal. The signal output from the receiving circuit 120 is input to the DSP 100 and supplied to the adaptive filter 101. In the adaptive filter 101, the notch frequency follows the signal having the maximum amplitude in the received signal. The DSP 100 calculates the frequency of the maximum amplitude in the received signal from the filter coefficient of the adaptive filter 101, calculates difference frequency information F between this frequency and a preset frequency, and outputs it to the MPU 110.

  The MPU 110 generates reception frequency data based on the difference frequency information F of the DSP 100 and outputs it to the frequency synthesizer 130. For example, when the receiving circuit 120 receives a 14.100 MHz signal, the receiving circuit 120 outputs a beat sound of 800 Hz. In that case, when the reception frequency is shifted by −500 Hz (when the reception frequency is 14.0995 MHz), the reception circuit 120 outputs a beat sound of 1300 Hz. In that case, the notch frequency of the adaptive filter 101 is 1300 Hz, and the filter coefficient of the adaptive filter 101 is acquired by the DSP 100. The DSP 100 obtains a difference from a preset frequency of 800 Hz and supplies this to the MPU 110 as difference frequency information F.

  The MPU 110 inputs the difference frequency information F, determines that the reception frequency is +500 Hz, and supplies reception frequency data to the frequency synthesizer 130 so that the difference becomes “0”. By repeating such an operation, the reception frequency can be set to 14.100 MHz.

  FIG. 8 is a diagram illustrating a configuration of a receiver using the technique disclosed in Patent Document 3. In FIG. In this example, the receiver includes a DSP 100, an MPU 110, a receiving circuit 120, a frequency synthesizer 130, a speaker 140, a coefficient ROM 150, a filter characteristic selection instruction unit 160, and a frequency change instruction unit 170. The DSP 100 has a band limiting filter 102. Furthermore, the MPU 110 has a filter characteristic switching processing unit 111 and a frequency data creation processing unit 112.

  In this example, when the frequency change instruction unit 170 is operated, the frequency data creation processing unit 112 of the MPU 110 generates reception frequency data corresponding to the operation content and supplies it to the frequency synthesizer 130. The frequency synthesizer 130 generates a frequency signal corresponding to the reception frequency data and supplies the frequency signal to the reception circuit 120. The reception circuit 120 performs reception processing on the input signal according to the frequency signal from the frequency synthesizer 130 and outputs the input signal to the DSP 100. The DSP 100 performs band limitation processing on the signal input from the reception circuit 120 by the band limitation filter 102 and supplies the signal to the speaker 140. The speaker 140 outputs sound corresponding to the signal supplied from the DSP 100.

  Here, when the filter characteristic selection instruction unit 160 is operated, the filter characteristic switching processing unit 111 of the MPU 110 acquires a filter coefficient having a characteristic corresponding to the operation content from the coefficient ROM 150 and supplies it to the DSP 100. The DSP 100 sets the filter coefficient supplied from the filter characteristic switching processing unit 111 in the band limiting filter 102. As a result, the signal output from the receiving circuit 120 is filtered by the band limiting filter 102 having a desired characteristic, and the speaker 140 is driven by the filtered audio signal. According to such a configuration, even when an interference signal or a noise signal is included in the received signal, the clarity of the voice can be improved by appropriately removing these signals.

JP-A-10-173491 (Claims and Abstract)

JP-A-10-229349 (Claims and Abstract)

JP-A-3-11812 (Claims and Abstract)

  By the way, when using a radio equipped with the above-described two technologies in the CW communication mode, it is possible to match the frequencies of the partner station and the own station using the technology described in FIG. When there is a signal, there is a problem that the intelligibility of communication is lowered and communication cannot be performed comfortably.

  Therefore, by using the technique shown in FIG. 8 and selecting a narrow-band filter to suppress interference or noise, it is possible to improve the intelligibility of speech, but since these exist as independent functions, The user needs to perform operations for each of these, which is complicated. That is, since the user needs to perform an operation for selecting a filter after performing an operation for matching frequencies, there is a problem that the operation becomes complicated.

  When the band of the band limiting filter 102 is narrowed by the technique shown in FIG. 8 in order to improve the clarity of the target signal, after communication with the current partner station is completed, another partner station is When searching, it is better to set the pass band of the band limiting filter 102 to be wide. Therefore, when searching for a new communication partner, the user needs to select the band limiting filter 102 again, and there is a problem that the operation is complicated.

  The present invention has been made based on the above circumstances, and an object of the present invention is to provide a receiving apparatus, a transmitting / receiving apparatus, and a receiving method capable of improving user operability. .

  In order to achieve the above object, a receiving apparatus of the present invention includes a receiving means for receiving a signal, a filtering means for passing a predetermined band component of the signal received by the receiving means, and a signal passed by the filtering means. Reproducing means for reproducing, tuning means for tuning the reception frequency of the receiving means to a predetermined frequency, and adjusting means for adjusting the band characteristics of the filtering means when tuning by the tuning means is completed.

  In addition to the above-described invention, the receiving device according to another invention may be configured such that, when the tuning by the tuning unit is completed, the adjusting unit adjusts the pass band of the filtering unit to be narrower than before the tuning. ing.

  In addition to the above-described invention, a receiving device of another invention has a changing means for changing the receiving frequency of the receiving means, and when the adjusting means changes the receiving frequency by the changing means, The pass band is adjusted to be wider than when the tuning by the tuning means is completed.

  In addition to the above-described invention, a receiving apparatus according to another invention includes a selection unit that selects a pass band of the filtering unit when the reception frequency is changed by the changing unit from among a plurality of candidates.

  In addition to the above-described invention, the transmission / reception apparatus of the present invention includes transmission means for transmitting a signal at the same frequency as the reception frequency of the reception means.

  The receiving method of the present invention includes a receiving step for receiving a signal, a filtering step for allowing a predetermined band component of the signal received in the receiving step to pass, and a regeneration step for reproducing the signal passed in the filtering step; A tuning step for tuning the reception frequency by the reception step to a predetermined frequency, and an adjustment step for adjusting the band characteristic of the filtering step when tuning by the tuning step is completed.

  ADVANTAGE OF THE INVENTION According to this invention, the receiver which can improve a user's operativity, a transmission / reception apparatus, and the receiving method can be provided.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the following, (A) a configuration example of the embodiment, (B) an overview of the operation of the embodiment, (C) details of the operation of the embodiment, and (D) a modified embodiment will be described in this order. . Note that the reception method of the present invention will be described as the operation of the radio apparatus according to the embodiment of the present invention.

(A) Configuration example of the embodiment

  FIG. 1 is a block diagram illustrating a configuration example of a wireless device according to an embodiment of the present invention. As shown in the figure, a radio apparatus according to an embodiment of the present invention includes a DSP (Digital Signal Processor) 10, an MPU (Main Processing Unit) 20, a receiving circuit 30, a frequency synthesizer 40, a speaker 50, a coefficient ROM (Read Only). Memory) 60, filter characteristic selection instruction unit 70, frequency change instruction unit 80, and tuning start instruction unit 90 are main components. In addition to this, a transmission circuit or the like as a transmission means is included, but this portion is omitted.

  Here, the DSP 10 is an arithmetic device that executes various arithmetic processes based on a program stored in a built-in memory (not shown). In this example, the band limiting filter 11, the adaptive filter 12, and the like are realized by executing the program. The band limiting filter 11 as filtering means is a BPF (Band Pass Filter) that allows a predetermined band to pass. For example, one of the filters having different pass characteristics as shown in FIGS. Is realized. The example of FIG. 2A is an example having a pass characteristic having a bandwidth of 1 kHz centering on AF (Audio Frequency) of a CW (Continuous Wave) reception signal received in the present embodiment. FIG. 2B is an example having a pass characteristic having a bandwidth of 500 Hz centering on AF. FIG. 3 is an example having a pass characteristic having a bandwidth of 200 Hz centering on AF. The filter coefficients for realizing these characteristics are stored in the coefficient ROM 60 as will be described later, and the filter coefficient corresponding to the predetermined pass characteristic is selectively read out by the filter characteristic switching processing unit 22 and is sent to the DSP 10. Supplied. The DSP 10 implements the band limiting filter 11 having characteristics according to the filter coefficient supplied from the filter characteristic switching processing unit 22. The signal that has passed through the band limiting filter 11 is supplied to the speaker 50 and output as sound.

  The adaptive filter 12 as a part of the tuning means is realized by, for example, an IIR (Infinite Impulse Response) filter so that the notch frequency follows the frequency having the maximum amplitude in the received signal supplied from the receiving circuit 30. The filter coefficient is changed. The DSP 10 specifies the frequency of the signal having the maximum amplitude in the received signal based on the filter coefficient of the adaptive filter 12, calculates the difference between the specified frequency and a predetermined specific frequency, and calculates the difference frequency information. F is output to the MPU 20. For example, when the receiving circuit 30 receives a 14.100 MHz signal, the receiving circuit 30 outputs an 800 Hz beat sound. In this case, when the reception frequency is shifted by −500 Hz (when the reception frequency is 14.0995 MHz), the reception circuit 30 outputs a beat sound of 1300 Hz. In this case, the notch frequency of the adaptive filter 12 is 1300 Hz, and the filter coefficient of the adaptive filter 12 is acquired by the DSP 10. The DSP 10 calculates a difference from a preset frequency of 800 Hz, and supplies this to the MPU 20 as difference frequency information F.

  The MPU 20 includes, for example, a CPU (Central Processing Unit), a ROM, a RAM (Random Access Memory), and the like (not shown), executes various processes based on a program stored in the ROM, and illustrates them. Realize the function. Specifically, the MPU 20 includes a frequency tuning determination processing unit 21, a filter characteristic switching processing unit 22, and a frequency data creation processing unit 23. Here, the frequency tuning determination processing unit 21 as a part of the tuning unit executes processing related to frequency tuning. Specifically, the frequency tuning determination processing unit 21 starts the operation when an instruction is given from the tuning start instruction unit 90, and stores that the frequency tuning determination operation is being performed. Then, the difference frequency information F from the DSP 10 is supplied to the frequency data creation processing unit 23, and when the difference frequency information F becomes “0”, the memory during the frequency tuning determination operation is released (deleted), The filter characteristic switching processing unit 22 is notified of the completion of frequency tuning.

  The filter characteristic switching processing unit 22 as the adjusting means reads out the corresponding filter coefficient from the coefficient ROM 60 based on the instruction from the filter characteristic selection instruction unit 70, the frequency change instruction unit 80, or the frequency tuning determination processing unit 21, The band limit filter 11 of the DSP 10 is set. Specifically, the filter characteristic switching processing unit 22 reads out a corresponding filter coefficient from the coefficient ROM 60 based on an instruction from the filter characteristic selection instruction unit 70 and sets it in the band limiting filter 11 of the DSP 10. Further, when the frequency tuning determination processing unit 21 notifies the frequency tuning completion, the filter characteristic switching processing unit 22 stores the frequency tuning completion state and reads out a filter coefficient of a predetermined narrow pass band from the coefficient ROM 60. Thus, the band limit filter 11 of the DSP 10 is set. Further, when an instruction to change the reception frequency is given from the frequency change instruction unit 80, the filter characteristic switching processing unit 22 first determines whether or not the frequency tuning completion state is stored and stored. In this case, the storage of the frequency tuning completion state is canceled, and the filter coefficient selected by the filter characteristic selection instruction unit 70 is read from the coefficient ROM 60 and set in the band limiting filter 11 of the DSP 10.

  The frequency data creation processing unit 23 as a part of the tuning unit and the part of the changing unit generates the corresponding reception frequency data based on the instructions from the frequency tuning determination processing unit 21 and the frequency change instruction unit 80, This is supplied to the synthesizer 40. Specifically, when the frequency change instruction unit 80 is operated, the frequency data creation processing unit 23 generates reception frequency data corresponding to the operation content and supplies the reception frequency data to the frequency synthesizer 40. In addition, when the difference frequency information is supplied from the frequency tuning determination processing unit 21, the frequency data creation processing unit 23 generates reception frequency data that sets the difference frequency to “0”, and sends it to the frequency synthesizer 40. Supply.

  The receiving circuit 30 performs a predetermined receiving process on the input signal based on the frequency signal supplied from the frequency synthesizer 40 and outputs the input signal.

  The frequency synthesizer 40 is configured by, for example, a PLL (Phase Locked Loop) or the like, oscillates at a predetermined frequency based on the reception frequency data supplied from the frequency data creation processing unit 23, generates a frequency signal, and receives the reception circuit 30. To supply.

  The speaker 50 as a receiving unit is an electro-acoustic conversion device that outputs sound corresponding to an audio signal (analog signal) supplied from the DSP 10.

  The coefficient ROM 60 as a part of the selection means stores a coefficient for realizing the BPF having the characteristics shown in FIGS. Specifically, an IIR filter or FIR (Finite Impulse Response) filter coefficient is stored.

  The filter characteristic selection instructing unit 70 as a part of the selection means is constituted by, for example, operation buttons and the like, and when the operation button is operated, information corresponding to the operation content is generated to generate the filter characteristic switching processing unit 22. Output for.

  The frequency change instructing unit 80 as a part of the changing unit is configured by, for example, an operation button or the like. When the operation button is operated, the frequency change instructing unit 80 generates information according to the operation content and the filter characteristic switching processing unit 22 and Output to the frequency data creation processing unit 23.

  The tuning start instruction unit 90 is constituted by, for example, an operation button or the like. When the operation button is operated, information corresponding to the operation content is generated and output to the frequency tuning determination processing unit 21.

(B) Overview of operation of the embodiment

  Next, an outline of the operation of the embodiment of the present invention will be described. When starting communication using the CW method with the wireless device of the present embodiment, the user operates the filter characteristic selection instruction unit 70 to widen the band limiting filter 11 so that the partner station can be easily found. Set to passband characteristics. For example, the filter is set to a passband filter shown in FIG. Thereby, since the reception signals of a plurality of counterpart stations are output from the speaker 50, it is possible to reduce oversight even if the signal is weak. The characteristics of the filter selected in this way are stored in the filter characteristic switching processing unit 22.

  Next, the user operates the frequency change instruction unit 80 to change the reception frequency of the reception circuit 30. At this time, the reception signal received by the reception circuit 30 is output from the speaker 50 after passing through the band limiting filter 11, so that by listening to the sound output from the speaker 50, the user receives the signal from the partner station. Can be recognized.

  When the partner station is determined, the user operates the synchronization start instruction unit 90. Then, the adaptive filter 12 follows the frequency having the maximum amplitude contained in the received signal, and the receiving circuit 30 performs an operation of tuning the frequency (details will be described later). When the tuning operation is completed, the filter characteristic switching processing unit 22 automatically switches the characteristic of the band limiting filter 11 to, for example, the filter having the characteristic shown in FIG. Thereby, since the interference signal and the noise signal are removed from the signal passing through the band limiting filter 11, the clarity is improved.

  When communication with the partner station is completed and the next partner station is searched, the user operates the frequency change instruction unit 80 again. As a result, the frequency data creation processing unit 23 generates reception frequency data corresponding to the operation content and supplies it to the frequency synthesizer 40 to change the reception frequency. At this time, as described above, the filter characteristic switching processing unit 22 acquires the stored filter characteristics from the coefficient ROM 60 and sets them in the band limiting filter 11. These operations are performed automatically. Specifically, since the filter characteristic switching processing unit 22 stores the characteristics shown in FIG. 2A, the band limiting filter 11 has the characteristics shown in FIG. Thereby, as described above, the reception signals of a plurality of counterpart stations are output from the speaker 50, so that even a weak signal can be prevented from being overlooked.

  When the partner station is found, the band limit filter 11 is automatically changed to the characteristics shown in FIG. 3 after the user operates the tuning start instruction unit 90 and executes the tuning process, as in the case described above. The

  As described above, in the embodiment of the present invention, after the tuning operation is completed, the pass characteristic of the band limiting filter 11 is automatically changed to a narrow characteristic, so that the clarity of communication is improved. be able to.

  In the embodiment of the present invention, when searching for a new partner station after the communication is completed (when the frequency change instruction unit 80 is operated), the pass characteristic of the band limiting filter 11 is narrow. Therefore, it is possible to easily find the other station because it is automatically changed to a wide characteristic. Moreover, since it is changed automatically, the user does not need to perform complicated operations.

  Furthermore, in the embodiment of the present invention, the characteristics of the band limiting filter 11 can be arbitrarily changed by the filter characteristic selection instruction unit 70, so that the optimum filter can be selected according to the number of partner stations or the communication status. Can do.

(C) Details of operation of embodiment

  Next, the detailed operation of the embodiment of the present invention will be described.

  FIG. 4 is a flowchart for explaining an example of the operation of the frequency tuning determination processing unit 21 shown in FIG. When the processing of this flowchart is started, the following steps are executed.

  Step S10: The frequency tuning determination processing unit 21 determines whether or not it stores the fact that the frequency tuning determination operation is being performed, and if it is stored (if the frequency tuning determination operation is being performed) (YES (hereinafter, (Simply described as “Y”)) proceeds to step S13, and otherwise (NO (hereinafter simply described as “N”)) proceeds to step S11. When the tuning start instructing unit 90 is operated, it is stored in step S12 described later that the frequency tuning determination is being performed. In this case, the process proceeds to step S13.

  Step S11: The frequency tuning determination processing unit 21 determines whether or not the tuning start instruction unit 90 has been operated to give a tuning start instruction. If an instruction has been given, the process proceeds to step S12, and otherwise. Advances to step S17.

  Step S12: The frequency tuning determination processing unit 21 stores that the frequency tuning determination is being performed. As a result, in subsequent processing, it is determined as Y in step S10.

  Step S13: The frequency tuning determination processing unit 21 refers to the difference frequency information F supplied from the DSP 10 to determine whether or not the difference frequency is “0”. If not, the process proceeds to step S14. In other cases, the process proceeds to step S15. Specifically, when the frequency tuning determination operation is completed and the frequency having the maximum amplitude in the received signal is tuned, the difference frequency becomes “0”, so the process proceeds to step S15.

  Step S14: The frequency tuning determination processing unit 21 supplies the difference frequency information F supplied from the DSP 10 to the frequency data creation processing unit 23. Thus, the frequency data creation processing unit 23 generates reception frequency data based on the difference frequency information F and supplies the reception frequency data to the frequency synthesizer 40. Such an operation is repeated until the difference frequency becomes “0”. As a result, the reception frequency of the reception circuit 30 is tuned to a frequency having the maximum amplitude.

  Step S15: The frequency tuning determination processing unit 21 cancels the storage in which the frequency tuning determination operation is being performed.

  Step S16: The frequency tuning determination processing unit 21 notifies the filter characteristic switching processing unit 22 of the completion of frequency tuning. Upon receiving this notification, the filter characteristic switching processing unit 22 determines Y in step S33 of FIG. 5 to be described later, and changes the characteristic of the band limiting filter 11 to a narrow characteristic.

  Step S17: The frequency tuning determination processing unit 21 determines whether or not to end the process. If not, the process returns to step S10 to repeat the same process as described above, and otherwise the process is performed. finish. Specifically, if the wireless device is turned off, it is determined to end, and otherwise, the process returns to step S10 and the same processing is repeated.

  With the above processing, when the tuning start instructing unit 90 is operated, the reception frequency can be tuned with respect to the frequency having the maximum amplitude in the reception signal. Further, when the tuning is completed, the filter characteristic switching processing unit 22 can be notified of the completion of the frequency tuning.

  Next, the operation of the filter characteristic switching processing unit 22 shown in FIG. 1 will be described with reference to FIG. When the processing of this flowchart is started, the following steps are executed.

  Step S30: The filter characteristic switching processing unit 22 determines whether or not the filter characteristic selection instruction unit 70 has been operated. If operated, the process proceeds to step S31. Otherwise, the process proceeds to step S33.

  Step S31: The filter characteristic switching processing unit 22 stores the filter characteristic selected by operating the filter characteristic selection instruction unit 70. For example, when the characteristic shown in FIG. 2A is selected, this is stored. Specifically, for example, a serial number is given to the characteristics of the filter shown in FIGS. 2 and 3, and a serial number corresponding to a coefficient stored in the coefficient ROM 60 is also given. When the filter characteristic selection instruction unit 70 is operated, one of the serial numbers is selected, and the filter characteristic switching processing unit 22 stores the selected serial number.

  Step S32: The filter characteristic switching processing unit 22 acquires the filter coefficient corresponding to the filter characteristic selected in Step S31 from the coefficient ROM 60. Specifically, the filter characteristic switching processing unit 22 specifies a serial number corresponding to the selected characteristic, and acquires a filter coefficient corresponding to the serial number from the coefficient ROM 60.

  Step S33: The filter characteristic switching processing unit 22 determines whether or not there has been a frequency tuning completion notification from the frequency tuning determination processing unit 21, and proceeds to step S34 if there is a notification, otherwise it proceeds to step S36. Proceed to

  Step S34: The filter characteristic switching processing unit 22 stores the frequency tuning completion state. As a result, after that, it is determined as Y in step S37.

  Step S35: The filter characteristic switching processing unit 22 acquires a filter coefficient having a predetermined narrow pass characteristic from the coefficient ROM 60. Specifically, the filter characteristic switching processing unit 22 acquires filter coefficients corresponding to the filter characteristics shown in FIG.

  Step S36: The filter characteristic switching processing unit 22 determines whether or not the frequency change instructing unit 80 has been operated. If it has been operated, the process proceeds to step S37. Otherwise, the process returns to step S30 and the same. Repeat the process.

  Step S37: The filter characteristic switching processing unit 22 determines whether or not the frequency tuning completion state is stored. If so, the process proceeds to step S38. Otherwise, the process returns to step S30 and the same. Repeat the process. Specifically, if the frequency tuning completion state is stored in step S34, the process proceeds to step S38.

  Step S38: The filter characteristic switching processing unit 22 cancels the storage of the frequency tuning completion state. Thereby, in the process after this, it determines with N in step S37.

  Step S39: The filter characteristic switching processing unit 22 acquires a filter coefficient corresponding to the filter characteristic stored in Step S31 from the coefficient ROM 60. For example, when the characteristic shown in FIG. 2A is stored, the filter coefficient corresponding to this characteristic is acquired from the coefficient ROM 60.

  Step S40: The filter characteristic switching processing unit 22 supplies the DSP 10 with the filter coefficient acquired in steps S32, S35, and S39. Thus, when the filter characteristic selection instruction unit 70 is operated, the selected filter coefficient is supplied to the DSP 10. When there is a notification of completion of frequency tuning, a filter coefficient having a predetermined narrow pass characteristic is supplied to the DSP 10. Further, when the frequency change instruction unit 80 is operated and a frequency tuning completion notification is stored (when a filter coefficient having a predetermined narrow pass characteristic is set), it is selected in step S31. The filtered coefficients are supplied to the DSP 10.

  Step S41: The filter characteristic switching processing unit 22 determines whether or not to end the process. If not, the process returns to step S30 to repeat the same process, and otherwise the process ends. Specifically, if the wireless device is turned off, it is determined to end, and otherwise, the process returns to step S30 and the same processing is repeated.

  When the filter characteristic selection instruction unit 70 is operated by the above processing, the filter coefficient corresponding to the operation content is acquired from the coefficient ROM 60 and supplied to the DSP 10. When the tuning start instructing unit 90 is operated to notify the completion of frequency tuning, a filter coefficient having a predetermined narrow pass characteristic is acquired from the coefficient ROM 60 and supplied to the DSP 10. Further, when the frequency change instruction unit 80 is operated in a state where the frequency tuning process is executed and the filter coefficient having a predetermined narrow pass characteristic is applied, the filter characteristic selection instruction unit 70 is operated and selected. The filter coefficients having the filter characteristics obtained from the coefficient ROM 60 are supplied to the DSP 10.

  Next, the operation of the frequency data creation processing unit 23 shown in FIG. 1 will be described with reference to FIG. When the processing of this flowchart is started, the following steps are executed.

  Step S60: The frequency data creation processing unit 23 determines whether or not the frequency change instruction unit 80 has been operated. If it has been operated, the process proceeds to step S61; otherwise, the process proceeds to step S62.

  Step S61: The frequency data creation processing unit 23 generates reception frequency data corresponding to the operation content of the frequency change instruction unit 80. For example, when an operation for shifting the frequency to the higher side is performed, the current reception frequency data is increased by a predetermined value.

  Step S62: The frequency data creation processing unit 23 determines whether or not the difference frequency information F is supplied from the frequency tuning determination processing unit 21, and if it is supplied, the process proceeds to step S63. Returning to S60, the same processing is repeated.

  Step S63: The frequency data creation processing unit 23 creates reception frequency data that sets the difference frequency to “0”.

  Step S64: The frequency data creation processing unit 23 supplies the reception frequency data generated in Step S61 or Step S63 to the frequency synthesizer 40. As a result, the frequency synthesizer 40 generates a frequency signal based on the received frequency data and supplies the frequency signal to the receiving circuit 30. The receiving circuit 30 performs a receiving process based on the frequency signal.

  Step S65: The frequency data creation processing unit 23 determines whether or not to end the process. If not, the process returns to step S60 and repeats the same process. Otherwise, the process ends. Specifically, when the wireless device is turned off, it is determined that the process is to be terminated, and in other cases, the process returns to step S60 and the same processing is repeated.

  With the above processing, when the frequency change instruction unit 80 is operated, the reception frequency of the reception circuit 30 can be changed according to the operation content. Further, when the difference frequency is supplied from the frequency tuning determination processing unit 21, the reception frequency can be adjusted so that the difference frequency becomes “0”.

  Next, specific operations of the embodiment of the present invention will be described with reference to FIGS.

  When starting communication by the CW method, the user operates the filter characteristic selection instruction unit 70 to set the band limiting filter 11 to a wide band characteristic so that the partner station can be easily found. For example, if the user operates the filter characteristic selection instruction unit 70 and selects the characteristic shown in FIG. 2A, the filter characteristic switching processing unit 22 determines Y in step S30 of FIG. 5, and step S31. Then, the selected filter characteristic is stored, and the filter coefficient selected in step S32 is acquired from the coefficient ROM 60, and is supplied to the DSP 10 in step S40. As a result, the characteristic of the band limiting filter 11 becomes the characteristic shown in FIG. Thereby, since the reception signals of a plurality of counterpart stations are output from the speaker 50, it is possible to reduce oversight even if the signal is weak.

  Next, the user operates the frequency change instruction unit 80 to change the reception frequency of the reception circuit 30. That is, when the user operates the frequency change instruction unit 80, the frequency data creation processing unit 23 determines Y in step S60 of FIG. 6, generates reception frequency data corresponding to the operation content in step S61, and in step S64. The frequency synthesizer 40 is supplied. Thereby, the reception frequency is changed according to the operation content of the frequency change instruction unit 80. At this time, the reception signal received by the reception circuit 30 is output from the speaker 50 after passing through the band limiting filter 11, so that the signal from the partner station can be confirmed by listening to the sound output from the speaker 50. . At that time, the filter characteristic switching processing unit 22 determines Y in step S36 in FIG. 5, but does not store the frequency tuning completion state, so determines N in step S37 and returns to step S30 to perform the same. Repeat the process.

  When the partner station is determined, the user operates the tuning start instruction unit 90. Then, the adaptive filter 12 follows the frequency having the maximum amplitude included in the received signal. At this time, the frequency tuning determination processing unit 21 determines Y in step S11 of FIG. 4, proceeds to step S12, stores that the frequency tuning determination is being performed, and proceeds to step S13. In step S13, it is determined whether or not the difference frequency is “0”. If it is not “0”, the process proceeds to step S14, and the difference frequency is supplied to the frequency data creation processing unit 23. Since the difference frequency information is supplied, the frequency data creation processing unit 23 determines Y in step S62 in FIG. 6, creates reception frequency data that sets the difference frequency to “0” in step S63, and performs step S64. To the frequency synthesizer 40. By repeating such an operation, the receiving circuit 30 automatically tunes to a frequency having the maximum amplitude.

  When the tuning operation is completed, the difference frequency becomes “0”. Therefore, the frequency tuning determination processing unit 21 determines Y in step S13 of FIG. 4 and cancels the storage in the frequency tuning determination operation in step S15. In step S16, the filter characteristic switching processing unit 22 is notified of the completion of frequency tuning.

  When receiving notification of frequency tuning completion from the frequency tuning determination processing unit 21, the filter characteristic switching processing unit 22 determines Y in step S33, stores the frequency tuning completion state in step S34, and passes a predetermined narrow passage in step S35. The characteristic filter coefficient is acquired from the coefficient ROM 60 and supplied to the DSP 10 in step S40. As a result, a filter coefficient having a narrow pass characteristic shown in FIG. Thereby, since the noise signal or the interference signal is removed from the signal passing through the band limiting filter 11, the clarity of communication is improved.

  When communication with the partner station is completed and the next partner station is searched, the user operates the frequency change instruction unit 80 again. As a result, the frequency data creation processing unit 23 determines Y in step S60 of FIG. 6, generates reception frequency data corresponding to the operation content in step S61, and supplies it to the frequency synthesizer 40 in step S64. Thereby, the reception frequency is changed according to the operation content of the frequency change instruction unit 80. At this time, the filter characteristic switching processing unit 22 determines Y in step S36 of FIG. 5 and proceeds to step S37. In step S37, since the frequency tuning completion state is stored, the filter characteristic switching processing unit 22 determines Y, and the process proceeds to step S38. In step S38, the filter characteristic switching processing unit 22 cancels the storage of the frequency tuning completion state, and in step S39, acquires the filter coefficient of the filter characteristic stored in step S31 from the coefficient ROM 60, and in step S40, the DSP 10 Supply. Thereby, the characteristics of the band limiting filter 11 are automatically changed from the characteristics shown in FIG. 3 to the characteristics shown in FIG. As a result, the reception signals of a plurality of counterpart stations are output from the speaker 50, so that even a weak signal can be omitted. In addition, since such a switching process is automatically executed, the user does not need to perform an operation for the filter characteristics.

  Then, when a new partner station is found, the band operation filter 11 is changed to the characteristics shown in FIG. 3 after the user operates the tuning start instruction unit 90 and the tuning process is executed, as in the case described above. Is done. That is, the same process as described above is repeated.

  As described above, in the embodiment of the present invention, after the tuning operation is completed, the pass characteristic of the band limiting filter 11 is automatically changed to a narrow characteristic, so that the clarity of communication is improved. be able to.

  In the embodiment of the present invention, when searching for a new communication partner after the communication is completed, the pass characteristic of the band limiting filter 11 is changed from a narrow characteristic to a wide characteristic. Can be easily found. Moreover, since this change process is automatically performed, the operability for the user can be improved.

  Furthermore, in the embodiment of the present invention, the characteristics of the band limiting filter 11 can be changed by the filter characteristic selection instruction unit 70, so that the optimum filter can be selected according to the number of partner stations or the communication status. .

(F) Modified embodiment

  The above-described embodiments are preferred examples of the present invention, but the present invention is not limited to these, and various modifications and changes can be made without departing from the scope of the present invention. is there.

  For example, in the above embodiment, the wireless device has been described as an example, but the present invention is not limited to such a case, and can be used for other electronic devices.

  In the above embodiment, the CW communication has been described as an example, but it goes without saying that the present invention can be applied to other communication methods.

  Further, in the above embodiment, the adaptive filter 12 is connected to the output side of the band limiting filter 11, but may be connected to the input side.

  In the above embodiment, the band limiting filter 11 has three types of characteristics. However, the characteristics may be two or less or four or more. For example, all or some of 50 Hz, 80 Hz, 100 Hz, 150 Hz, 300 Hz, 400 Hz, 600 Hz, and 2 kHz may be added as options.

  In the above embodiment, the filter having the predetermined narrow pass characteristic set after the frequency tuning is completed is the filter having the characteristic shown in FIG. 3, but other characteristics may be used. For example, any of the above-described 50 Hz, 80 Hz, 100 Hz, 150 Hz, 300 Hz, 400 Hz, and 600 Hz may be used. Alternatively, the user may be able to select a predetermined narrow passage characteristic. For example, after the frequency tuning process is completed, when the filter characteristic selection instruction unit 70 is operated to select a predetermined characteristic, the selected characteristic is set as a filter having a predetermined narrow pass characteristic. Also good.

  In the above embodiment, the filter characteristic selected by operating the filter characteristic selection instruction unit 70 is wider or the same as the filter having a predetermined narrow pass characteristic set when the tuning process is completed. The characteristics of However, the filter selected by operating the filter characteristic selection instruction unit 70 may include characteristics in a narrower band than a filter having a predetermined narrow passband. For example, when the filter selected by operating the filter characteristic selection instructing unit 70 is the three types of characteristics shown in FIGS. 2A and 2B and FIG. 3, the filter shown in FIG. This is a case where the characteristic B) is selected. In this case, when the filter characteristic selection instruction unit 70 is operated and a filter having a narrower pass characteristic than a filter having a predetermined narrow pass characteristic is selected (in this example, the filter characteristic selection instruction unit 70 is operated). In the case where the characteristic of FIG. 3 is selected), the process of step S35 of FIG. 5 may be skipped. In other words, in such a case, if the filter coefficient of the “predetermined narrow pass characteristic filter” is read in step S35, the band characteristic becomes wider than the current pass characteristic, which is contrary to the intention of the user. This is because an interference signal may be included in the band.

  The present invention can be applied to, for example, a wireless device having a CW method.

It is a block diagram which shows the structural example of the radio | wireless apparatus which concerns on embodiment of this invention. It is a figure which shows an example of the characteristic of the band-limiting filter shown in FIG. It is a figure which shows another example of the characteristic of the band-limiting filter shown in FIG. It is a flowchart explaining the flow of the process which the frequency tuning determination process part shown in FIG. 1 performs. It is a flowchart explaining the flow of the process which the filter characteristic switching process part shown in FIG. 1 performs. It is a flowchart explaining the flow of the process which the frequency data creation process part shown in FIG. 1 performs. It is a figure which shows the structure of the conventional radio | wireless machine. It is a figure which shows the other structure of the conventional radio | wireless machine.

Explanation of symbols

11 Band limiting filter (filtering means)
12 Adaptive filter (part of tuning means)
21 Frequency tuning determination processing part (part of tuning means)
22 Filter characteristic switching processing section (adjustment means)
23 Frequency data creation processing part (part of tuning means, part of changing means)
30 Receiving circuit (receiving means)
50 Speaker (reproduction means)
60 Coefficient ROM (part of selection means)
70 Filter characteristic selection instruction section (part of selection means)
80 Frequency change instruction section (part of changing means)

Claims (6)

Receiving means for receiving a signal;
Filtering means for passing a predetermined band component of the signal received by the receiving means;
Reproducing means for reproducing the signal passed by the filtering means;
Tuning means for tuning the receiving frequency of the receiving means to a predetermined frequency;
When tuning by the tuning means is completed, an adjusting means for adjusting the band characteristics of the filtering means;
A receiving apparatus comprising:   2. The receiving apparatus according to claim 1, wherein, when the tuning by the tuning unit is completed, the adjusting unit adjusts the pass band of the filtering unit to be narrower than before the tuning. Changing means for changing the receiving frequency of the receiving means;
3. The adjustment unit according to claim 2, wherein when the reception frequency is changed by the changing unit, the adjustment unit adjusts so that a pass band of the filtering unit becomes wider than a case where tuning by the tuning unit is completed. The receiving device described.   4. The receiving apparatus according to claim 3, further comprising selection means for selecting a pass band of the filtering means when changing the reception frequency by the changing means from a plurality of candidates.   The transmission / reception apparatus according to claim 1, further comprising a transmission unit that transmits a signal at the same frequency as the reception frequency of the reception unit. A receiving step for receiving a signal;
A filtering step of passing a predetermined band component of the signal received in the reception step;
A reproduction step for reproducing the signal passed in the filtering step;
A tuning step for tuning the reception frequency of the reception step to a predetermined frequency;
When the tuning by the tuning step is completed, an adjustment step for adjusting the band characteristic of the filtering step;
A receiving method comprising:

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