JP2016208334A - Electronic device and method of operating electronic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique capable of appropriately finding the frequency of a receivable channel.SOLUTION: The electronic device is capable of receiving signals of a plurality of channels to which different frequencies are allocated, and includes a search processing unit and a threshold adjustment unit. The search processing unit compares the value indicating the reception state at the reception frequency with the threshold value while shifting the reception frequency and executes a search process for searching the frequency of receivable channels on the basis of the comparison result. The threshold adjustment unit adjusts the threshold value according to the operation state of the electronic device.SELECTED DRAWING: Figure 2

Description

  The present invention relates to reception technology.

  As described in Patent Documents 1 and 2, various reception techniques have been conventionally proposed.

JP 2001-267951 A JP 2009-124293 A

  When receiving signals of a plurality of channels to which different frequencies are assigned, search processing for searching for frequencies of receivable channels is executed. In this search process, it is desirable that the frequency of receivable channels can be found appropriately.

  Therefore, the present invention has been made in view of the above points, and an object thereof is to provide a technique capable of appropriately finding a frequency of a receivable channel.

  An electronic device and a method for operating the electronic device are disclosed. In one embodiment, the electronic device can receive signals of a plurality of channels to which different frequencies are assigned, and includes a search processing unit and a threshold adjustment unit. The search processing unit compares the value indicating the reception state at the reception frequency with a threshold value while changing the reception frequency, and executes search processing for searching for the frequency of a receivable channel based on the comparison result. To do. The threshold adjustment unit adjusts the threshold according to the operation status of the electronic device.

  In one embodiment, the operation method of the electronic device is an operation method of the electronic device that can receive signals of a plurality of channels to which different frequencies are assigned. The operation method of the electronic device is a search process in which a value indicating a reception state at the reception frequency is compared with a threshold while the reception frequency is changed, and a frequency of a receivable channel is searched based on the comparison result. And a step of adjusting the threshold value according to the operating state of the electronic device.

  The frequency of the receivable channel can be found appropriately.

It is a figure which shows the structure of an electronic device. It is a figure which shows the structure of a receiving circuit. It is a figure which shows an example of FM radio screen. It is a flowchart which shows operation | movement of a receiving circuit. It is a figure which shows an example of RSSI in the frequency of each channel. It is a figure which shows an example of RSSI in the frequency of each channel. It is a flowchart which shows operation | movement of a control part. It is a flowchart which shows operation | movement of a control part. It is a figure which shows an example of a setting value table. It is a figure which shows an example of a setting value table. It is a flowchart which shows operation | movement of a control part. It is a flowchart which shows operation | movement of a control part.

<Configuration of electronic equipment>
FIG. 1 is a diagram illustrating a configuration of the electronic device 1. The electronic device 1 is a mobile phone such as a smartphone, for example. The electronic device 1 can communicate with an external device using a plurality of types of communication methods. Further, the electronic device 1 can be contactlessly charged by an external contactless charging device 200. Contactless charging is also called “wireless charging” or “contactless charging”.

  As shown in FIG. 1, the electronic device 1 includes a control unit 2, a first wireless communication unit 3, a second wireless communication unit 4, a third wireless communication unit 5, and a fourth wireless communication unit 6. I have. The electronic device 1 further includes a receiver 7, an external speaker 8, a microphone 9, a receiving circuit 10, and a wired communication unit 11. The electronic device 1 includes a display panel 12, a touch panel 13, an imaging unit 14, and a power supply unit 15.

  The control unit 2 can control other components such as the first wireless communication unit 3 so as to comprehensively manage the operation of the electronic device 1. The control unit 2 is a kind of digital processing circuit, and includes a CPU (Central Processing Unit) 20, a DSP (Digital Signal Processor) 21, a storage unit 22, and the like. The storage unit 22 includes a ROM (Read-Only-Memory), a RAM (Random-Access-Memory), and the like. Various functions of the control unit 2 are realized by the CPU 20 and the DSP 21 executing various programs in the storage unit 22.

  For example, the first wireless communication unit 3 performs wireless communication (hereinafter referred to as “CDMA communication”) according to CDMA (Code Division Multiple Access) 2000 1x with the base station. The first wireless communication unit 3 has an antenna 3a. The first wireless communication unit 3 performs amplification processing or the like on the reception signal received by the antenna 3 a and outputs the reception signal after various processing to the control unit 2. The first wireless communication unit 3 performs amplification processing on the transmission signal generated by the control unit 2 and transmits the transmission signal after various processings from the antenna 3a.

  For example, the second wireless communication unit 4 performs communication (hereinafter referred to as “LTE communication”) according to LTE (Long Term Evolution) with the base station. The second wireless communication unit 4 has an antenna 4a. The second wireless communication unit 4 performs amplification processing on the reception signal received by the antenna 4 a and outputs the reception signal after various processings to the control unit 2. In addition, the second wireless communication unit 4 performs amplification processing on the transmission signal generated by the control unit 2 and transmits the transmission signal after various processes from the antenna 4a.

  For example, the third wireless communication unit 5 performs wireless communication according to Bluetooth (registered trademark) (hereinafter referred to as “Bluetooth communication”) with an external device. The third wireless communication unit 5 can communicate with, for example, Bluetooth compatible headphones, speakers, and a keyboard. The third wireless communication unit 5 has an antenna 5a. The third wireless communication unit 5 performs amplification processing or the like on the reception signal received by the antenna 5a, and outputs the reception signal after various processings to the control unit 2. The third wireless communication unit 5 performs amplification processing on the transmission signal generated by the control unit 2 and transmits the transmission signal after various processes from the antenna 5a.

  For example, the fourth wireless communication unit 6 performs wireless communication according to WiFi (Wireless Fidelity) (hereinafter referred to as “WiFi communication”) as an access point. The fourth wireless communication unit 6 has an antenna 6a. The fourth wireless communication unit 6 performs amplification processing or the like on the reception signal received by the antenna 6a, and outputs the reception signal after various processes to the control unit 2. The fourth wireless communication unit 6 performs amplification processing on the transmission signal generated by the control unit 2 and transmits the transmission signal after various processings from the antenna 6a.

  The control unit 2 performs a demodulation process on the reception signals output from the first wireless communication unit 3, the second wireless communication unit 4, the third wireless communication unit 5, and the fourth wireless communication unit 6 to perform the reception. Acquire various data included in the signal.

  The receiving circuit 10 receives, for example, an FM (Frequency Modulation) radio signal. The receiving circuit 10 has an antenna 100a. The receiving circuit 10 performs various processes on the FM radio signal received by the antenna 100a, extracts a sound signal including sound from the FM radio signal, and outputs the sound signal to the control unit 2. The control unit 2 performs filter processing or the like on the sound signal from the receiving circuit 10 and outputs the processed sound signal to the receiver 7 or the external speaker 8. As a result, audio or the like broadcast from the FM radio broadcasting station is output from the receiver 7 or the external speaker 8. The control unit 2 can also output a sound signal to the third wireless communication unit 5. When the third wireless communication unit 5 receives the sound signal from the control unit 2, the third wireless communication unit 5 performs Bluetooth communication and outputs the received sound signal to Bluetooth-compatible headphones, speakers, and the like. As a result, audio or the like broadcast from the FM radio broadcasting station is output from the Bluetooth-compatible headphones and speakers.

  For example, the wired communication unit 11 performs wired communication (hereinafter referred to as “USB communication”) according to USB (Universal Serial Bus) with an external device. The wired communication unit 11 receives a signal from an external device that performs USB communication and outputs the signal to the control unit 2. The wired communication unit 11 outputs the signal generated by the control unit 2 to an external device that performs USB communication.

  The receiver 7 outputs a received sound, and is composed of, for example, a dynamic speaker. The receiver 7 converts the electrical sound signal from the control unit 2 into sound and outputs the sound.

  The external speaker 8 is a dynamic speaker, for example, and converts an electrical sound signal from the control unit 2 into sound and outputs the sound. The sound output from the external speaker 8 can be heard at a place away from the electronic device 1.

  The microphone 9 converts sound input from the outside of the electronic device 1 into an electrical sound signal and outputs the electrical sound signal to the control unit 2. The display panel 12 is, for example, a liquid crystal display panel or an organic EL panel. The display panel 12 displays various types of information such as characters, symbols, and figures by being controlled by the control unit 2. Information displayed on the display panel 12 is displayed in a transparent display area provided on the front surface of the electronic device 1, so that the information can be visually recognized by the user of the electronic device 1.

  The touch panel 13 is, for example, a projected capacitive touch panel, and detects an operation on a display area provided on the front surface of the electronic device 1. When the touch panel 13 detects an operation on the display area, the touch panel 13 outputs a detection signal to the control unit 2. Based on the detection signal from the touch panel 13, the control unit 2 specifies the content of the operation performed on the display area and performs processing according to the content.

  The imaging unit 14 includes an imaging lens, an imaging element, and the like, and captures still images and moving images based on control by the control unit 2. The imaging unit 14 outputs image data indicating the captured image to the control unit 2.

  The power supply unit 15 outputs a power supply for the electronic device 1. The power output from the power supply unit 15 is supplied to the control unit 2 and the first wireless communication unit 3 included in the electronic device 1. The power supply unit 15 includes a battery 150 and a charge processing unit 151 that charges the battery 150. The power supply unit 15 outputs power from the battery 150 as a power supply for the electronic device 1. The power supply unit 15 can also output power supplied from the outside of the electronic device 1 as a power source of the electronic device 1.

  The charging processing unit 151 can charge the battery 150 based on electric power from the non-contact charging device 200 that performs non-contact charging for the electronic device 1. The non-contact charging device 200 is provided with a power transmission coil 200 a that sends electric power to the charging processing unit 151. The charging processing unit 151 is provided with a power receiving coil 151a that receives power supplied from the power transmitting coil 200a. The charging processing unit 151 charges the battery 150 based on the power received by the power receiving coil 151a. For example, when the electronic device 1 is placed on the contactless charging device 200, the contactless charging of the electronic device 1 by the contactless charging device 200 is performed. Non-contact charging is performed in accordance with, for example, a standard defined by PMA (Power Matters Alliance). The non-contact charging may be performed in accordance with other standards, for example, a standard called Qi (Chi).

<Configuration of receiving circuit>
Next, the configuration of the receiving circuit 10 will be described in detail. FIG. 2 is a diagram illustrating a configuration of the receiving circuit 10. The receiving circuit 10 can receive signals of a plurality of FM radio channels to which different frequencies are assigned under the control of the control unit 2. Hereinafter, the FM radio channel may be referred to as “radio channel” or “channel”.

  As shown in FIG. 2, the reception circuit 10 includes a front-end circuit 100 having an antenna 100a, a local oscillator 101, a detection circuit 102, an A / D converter 103, a reception level measurement circuit 104, a reception channel. And a selection unit 105.

  The front-end circuit 100 performs an amplification process, a down-conversion process, a filter process, and the like on the FM radio signal received by the antenna 100a to generate an intermediate-frequency FM radio signal (hereinafter referred to as an “IF signal”). Output. The front-end circuit 100 multiplies the local oscillation signal output from the local oscillator 101 by the FM radio signal received by the antenna 100a with a mixer, and filters the resulting signal with a bandpass filter to perform IF processing. Generate a signal. The frequency of the local oscillation signal (hereinafter referred to as “local oscillation frequency”) is controlled by the reception channel selection unit 105. By controlling the local oscillation frequency, the reception frequency in the reception circuit 10 is controlled, and the reception channel is selected (tuned).

  The detection circuit 102 performs detection processing on the IF signal output from the front-end circuit 100, and acquires a sound signal included in the IF signal. The A / D converter 103 converts the sound signal acquired by the detection circuit 102 from an analog format to a digital format and outputs the converted signal to the control unit 2.

  The reception level measurement circuit 104 obtains RSSI (Received Signal Strength Indication) at the reception frequency, in other words, RSSI at the reception channel, based on the IF signal from the front end circuit 100. It can be said that RSSI is a reception level. It can be said that RSSI is a value indicating a reception state.

  The reception channel selection unit 105 sets a local oscillation frequency in response to an instruction from the control unit 2. The reception channel selection unit 105 sets the reception frequency in the reception circuit 10 by setting the local oscillation frequency. That is, the reception channel selection unit 105 sets which frequency signal is to be acquired from the reception signal received by the antenna 100a by setting the local oscillation frequency. By setting the reception frequency, a reception channel that is received by the reception circuit 10 is selected.

  Further, the reception channel selection unit 105 executes a search process for searching for a frequency of a receivable channel (hereinafter referred to as “receivable channel frequency”) using RSSI obtained by the reception level measurement circuit 104. Therefore, the reception channel selection unit 105 also functions as a search processing unit that executes search processing. When the reception frequency of the reception circuit 10 matches the frequency of the channel, the reception circuit 10 receives the signal of the channel and outputs it to the control unit 2. As a result, the audio broadcast from the channel is output from the electronic device 1.

<About search processing>
When the user performs a predetermined operation on the display area on the front surface of the electronic device 1, the control unit 2 stores an application program (hereinafter, “FM radio application”) stored in the storage unit 22 for receiving FM radio broadcasts. Call it). FIG. 3 is a diagram illustrating a display example of the FM radio screen 300 displayed on the electronic device 1 when the FM radio application is being executed. The user can select a reception channel using the FM radio screen 300.

  The FM radio screen 300 includes, for example, reception frequency information 301 indicating the current reception frequency. Further, the FM radio screen 300 includes a low frequency transition button 302a for shifting the reception frequency to the low frequency side and a high frequency transition button 302b for shifting the reception frequency to the high frequency side. Hereinafter, when it is not necessary to distinguish the low-frequency transition button 302a and the high-frequency transition button 302b, each is referred to as a “transition button 302”.

  When the low frequency transition button 302a is operated by the user, the control unit 2 instructs the reception channel selection unit 105 to shift the reception frequency to the low frequency side. Thereby, the reception channel selection unit 105 changes the local oscillation frequency and causes the reception frequency to transition to the low frequency side.

  On the other hand, when the high frequency transition button 302b is operated by the user, the control unit 2 instructs the reception channel selection unit 105 to shift the reception frequency to the high frequency side. As a result, the reception channel selection unit 105 changes the local oscillation frequency and shifts the reception frequency to the high frequency side.

  The control unit 2 controls the reception channel selection unit 105 to change the reception frequency at a predetermined interval every time there is a user operation. Hereinafter, the predetermined interval is referred to as a “transition step”. The transition step is set to 100 kHz or 200 kHz, for example. Note that the transition step may have other values. When the user performs a tap operation (short press operation) on the low frequency transition button 302a, the control unit 2 instructs the reception channel selection unit 105 to shift the reception frequency to the low frequency side by the transition step. As a result, the reception frequency is shifted to the low frequency side by the transition step. On the other hand, when the high frequency transition button 302b is tapped by the user, the control unit 2 instructs the reception channel selection unit 105 to shift the reception frequency to the high frequency side by the transition step. Thereby, the reception frequency is shifted to the high frequency side by the transition step.

  The control unit 2 can instruct the reception channel selection unit 105 to execute search processing. When the user performs a long tap operation (long press operation) on the low frequency transition button 302a, the control unit 2 searches the reception channel selection unit 105 for a receivable channel frequency while shifting the reception frequency to the low frequency side. Instructs execution of the low-frequency search process to be performed. Receiving channel selection unit 105 that has received an instruction to execute the low frequency search process searches for a receivable channel frequency while sequentially shifting the reception frequency to the low frequency side for each transition step. Receiving channel selection section 105 first finds a receivable channel frequency, and ends the low frequency search process with the receiving frequency set to the first receivable channel frequency found. As a result, when the receivable channel frequency is correctly found, sound or the like broadcast from the radio channel having the receivable channel frequency is output from the receiver 7 of the electronic device 1 or the like.

  On the other hand, when the high frequency transition button 302b is long-tapped by the user, the control unit 2 searches the reception channel selection unit 105 for a receivable channel frequency while sequentially shifting the reception frequency to the high frequency side. To execute the high-frequency search process. Receiving channel selection unit 105 that has received an instruction to execute the high frequency search process searches for a receivable channel frequency while sequentially shifting the reception frequency to the high frequency side for each transition step. Receiving channel selection section 105 first finds a receivable channel frequency and stops the high-frequency search process in a state where the receiving frequency is set to the first receivable channel frequency found.

  Thus, when the search process is started and the receivable channel frequency is first found, the search process is terminated with the received frequency set to the found receivable channel frequency. Sometimes called. Hereinafter, the receivable channel frequency first found in the search process, that is, the reception frequency when the search process is completed may be referred to as a “search stop frequency”.

  Hereinafter, the search processing in the reception channel selection unit 105 will be described in more detail. FIG. 4 is a flowchart showing search processing (search stop). As shown in FIG. 4, when receiving channel selection unit 105 receives a search execution instruction instructing execution of search processing (low frequency search processing or high frequency search processing) from control unit 2 in step s1, search processing is performed. To start. That is, the reception channel selection unit 105 changes the local oscillation frequency in step s2 and changes the reception frequency by the transition step. When receiving a low band search process execution instruction in step s1, the reception channel selection unit 105 shifts the current reception frequency to the low band side by a transition step. On the other hand, when receiving an instruction to execute a high frequency search process in step s1, the reception channel selection unit 105 changes the current reception frequency to the high frequency side by a transition step.

  Next, in step s3, the reception channel selection unit 105 determines whether the RSSI at the current reception frequency, which is obtained by the reception level measurement circuit 104, is greater than a threshold value. If it is determined in step s3 that the RSSI is larger than the threshold value, the reception channel selection unit 105 specifies the current reception frequency as a receivable channel frequency in step s4. Thereby, a receivable channel frequency is found. In step s5, the reception channel selection unit 105 ends the search process. At this time, since the reception frequency is set to the found receivable channel frequency (search stop frequency), the reception circuit 10 acquires a signal from the radio channel of the receivable channel frequency and acquires the control unit 2. Can be output.

  On the other hand, when the reception channel selection unit 105 determines in step s3 that the RSSI is equal to or less than the threshold value, the reception channel selection unit 105 executes step s2 again, and causes the current reception frequency to transition by the transition step. Thereafter, the reception channel selection unit 105 operates in the same manner. In the search process, the reception frequency automatically transitions at each transition step until a receivable channel frequency is found.

  When the user performs a long tap operation on the transition button 302 by the search stop as described above, the electronic device 1 identifies a receivable channel frequency close to the reception frequency when the long tap operation is performed and automatically sets the reception frequency to the reception frequency. Is set.

  In step s3, it is determined whether the RSSI is larger than the threshold value, but it may be determined whether the RSSI is equal to or larger than the threshold value. Hereinafter, the threshold value used in step s3 is referred to as “determination threshold value”.

  In step s3, the RSSI and the determination threshold are compared, but a value other than RSSI indicating the reception state may be compared with the determination threshold. For example, the S / N ratio or reception sensitivity may be compared with a determination threshold value.

  In addition, the user can store the current reception frequency in the electronic device 1 as a registered frequency by performing a predetermined operation on the FM radio screen 300. Then, the user can cause the electronic device 1 to set the registration frequency as the reception frequency by performing a predetermined operation on the FM radio screen 300. In addition, the user can input a setting value of the reception frequency to the electronic device 1 by performing a predetermined operation on the FM radio screen 300.

<About threshold adjustment processing>
In the electronic device 1, the noise level (noise floor) of the FM radio band in the receiving circuit 10 may increase depending on the operation status. For example, when battery 150 is contactlessly charged by contactless charging apparatus 200, the noise level of the FM radio band may increase. When at least one of the first wireless communication unit 3, the second wireless communication unit 4, the third wireless communication unit 5, the fourth wireless communication unit 6, and the wired communication unit 11 is communicating, the noise level of the FM radio band May increase. In particular, in the design of the electronic device 1, the layout of the antenna 3 a of the first wireless communication unit 3 that performs CDMA communication, the antenna 4 a of the second wireless communication unit 4 that performs LTE communication, the power receiving coil 151 a of the charging processing unit 151, and the like. Since priority is given to the layout of the antenna 100a of the receiving circuit 10, the receiving circuit 10 may be susceptible to noise. In this case, the noise level of the FM radio band in the receiving circuit 10 tends to increase depending on the operation status of the electronic device 1.

  When the noise level of the FM radio band increases, the reception channel selection unit 105 may not be able to appropriately specify the receivable channel frequency in the search process.

  FIG. 5 is a diagram illustrating an example of RSSI measured by the reception level measurement circuit 104 when the noise level of the FM radio band is small. FIG. 6 is a diagram illustrating an example of RSSI measured by the reception level measurement circuit 104 when the noise level of the FM radio band is large. 5 and 6, the horizontal axis indicates the frequency, and the vertical axis indicates the RSSI at the frequency indicated on the horizontal axis.

  5 and 6 show examples in which the electronic device 1 is used in an area where broadcasts from six radio channels can be received. The electronic device 1 can receive broadcasts of six radio channels. The six peaks shown in FIGS. 5 and 6 with arrows at the tips indicate the RSSI at the frequencies of the six radio channels, respectively. 5 and 6, the determination threshold value TH1 is set to −80 dBm.

  When the FM radio band noise level is small, as shown in FIG. 5, the determination threshold TH1 is between the RSSI at the frequency of each channel and the noise level (RSSI at the noise frequency). It is likely to be located. Therefore, in this case, it is unlikely that the reception channel selection unit 105 erroneously specifies the noise frequency as the receivable channel frequency, and the reception channel selection unit 105 can appropriately find the receivable channel frequency. it can. Therefore, when the above-described search stop is executed, it is highly likely that the search process is completed only when the reception frequency becomes the channel frequency. That is, the search process is unlikely to end when the reception frequency becomes a noise frequency.

  On the other hand, when the noise level of the FM radio band is high, the determination threshold value TH1 may be equal to or lower than the noise level as shown in FIG. In this case, there is a high possibility that the reception channel selection unit 105 erroneously specifies the noise frequency as the receivable channel frequency, and it is difficult for the reception channel selection unit 105 to find the receivable channel frequency appropriately. Become. Therefore, when the search stop is executed, there is a high possibility that the search process is finished even when the reception frequency becomes a noise frequency, and the search stop may not substantially function. In an extreme example, there is a possibility that the search process always ends when the reception frequency changes by a transition step (for example, 100 kHz) after the search process starts.

  Therefore, the electronic device 1 has a function of adjusting the determination threshold value according to its own operating situation. Thereby, even if the operation state of the electronic device 1 is an operation state with a large noise level, the electronic device 1 sets the determination threshold value between the RSSI at the frequency of each channel and the noise level. And the receivable channel frequency can be found appropriately. The adjustment of the determination threshold value is executed by the control unit 2, for example. That is, the control unit 2 functions as a threshold value adjustment unit that adjusts the determination threshold value according to the operation status of the electronic device 1. The control unit 2 executes threshold adjustment processing for adjusting the determination threshold during execution of the FM radio application. When the execution of the FM radio application is completed, the control unit 2 resets the determination threshold value and sets it to an initial value. Therefore, immediately after the start of execution of the FM radio application, the determination threshold value is set to an initial value.

  FIG. 7 is a flowchart showing the operation of the control unit 2 during execution of the FM radio application. As illustrated in FIG. 7, the control unit 2 that is executing the FM radio application performs a long tap operation on the transition button 302 included in the FM radio screen 300 based on the detection signal from the touch panel 13 in step s1. When it is recognized that the threshold value has been changed, threshold value adjustment processing is executed in step s12. In step s 13, the control unit 2 notifies the reception channel selection unit 105 of a search execution instruction. The control unit 2 that is executing the FM radio application executes steps s11 to s13 each time a long tap operation is performed on the transition button 302.

  FIG. 8 is a flowchart showing the threshold adjustment process in step s12. For example, the control unit 2 adjusts the determination threshold based on whether or not a process that increases the noise level of the FM radio band during the execution is currently being executed. Hereinafter, this process is referred to as “target process”. In the example of FIG. 8, the control unit 2 adjusts the determination threshold based on whether or not at least one of the plurality of target processes is being executed. The plurality of target processes include, for example, communication other than the reception circuit 10 and contactless charging. The communication includes, for example, CDMA communication, LTE communication, Bluetooth communication, WiFi communication, and USB communication.

  As shown in FIG. 8, in the threshold adjustment process, first, in step s <b> 121, the control unit 2 determines whether or not at least one of communication and non-contact charging is being performed in the electronic device 1. The communication here means communication other than reception by the receiving circuit 10, such as CDMA communication and LTE communication.

  In step s121, when the control unit 2 determines that at least one of communication and non-contact charging is being performed in the electronic device 1, in step s122, the control unit 2 sets a determination threshold value according to the operation state of the electronic device 1. . On the other hand, if the control unit 2 determines that communication and non-contact charging are not being performed in the electronic device 1, in step s123, the control unit 2 sets a determination threshold value to an initial value. When the determination threshold value is newly set by the control unit 2, the reception channel selection unit 105 executes search processing using the newly set determination threshold value.

  In step s122, the control unit 2 determines a determination threshold value based on the setting value table 400 stored in the storage unit 22. FIG. 9 is a diagram illustrating an example of the setting value table 400.

  As shown in FIG. 9, the setting value table 400 includes a plurality of setting values for the determination threshold value. Specifically, the setting value table 400 includes an initial value α0 and a plurality of setting values α1 to α6 corresponding to various operating conditions of the electronic device 1. The set values α1 to α6 correspond to a plurality of target processes, respectively. Specifically, the set values α1 to α6 correspond to CDMA communication, LTE communication, Bluetooth communication, WiFi communication, USB communication, and contactless charging, respectively.

  α1 is a setting value corresponding to the noise level in the FM radio band when the electronic device 1 is performing CDMA communication. α2 is a setting value corresponding to the noise level in the FM radio band when the electronic device 1 is performing LTE communication. α3 is a setting value according to the noise level in the FM radio band when the electronic device 1 is performing Bluetooth communication, and α4 is the noise level in the FM radio band when the electronic device 1 is performing WiFi communication. It is a set value according to. α5 is a set value α5 corresponding to the noise level in the FM radio band when the electronic device 1 is performing USB communication. α6 is a set value corresponding to the noise level in the FM radio band when the electronic device 1 is being contactlessly charged. During communication or non-contact charging, the noise level in the FM radio band increases, so each of the set values α1 to α6 is set to an initial value α0 or more. The set values α1 to α6 may include a plurality of set values having the same value.

  In step s122, when the first wireless communication unit 3 is executing CDMA communication, the control unit 2 sets the determination threshold value to the set value α1. When the second wireless communication unit 4 is performing LTE communication, the control unit 2 sets the determination threshold value to the set value α2. When the third wireless communication unit 5 is executing Bluetooth communication, the control unit 2 sets the determination threshold value to the set value α3. When the fourth wireless communication unit 6 is performing WiFi communication, the control unit 2 sets the determination threshold value to the set value α4. When the wired communication unit 11 is executing USB communication, the control unit 2 sets the determination threshold value to the set value α5. And the control part 2 sets the determination threshold value to setting value (alpha) 6 when the battery 150 is non-contact-charged by the non-contact charging device 200. FIG. It can be said that the initial value α0 is a setting value according to the noise level in the FM radio band when communication and non-contact charging are not performed in the electronic device 1.

  In step s122, when at least two target processes among a plurality of target processes such as CDMA communication are simultaneously executed, the control unit 2 sets at least two settings according to the at least two target processes. The maximum set value among the values is set as the judgment threshold value. For example, when non-contact charging and USB communication are being executed among a plurality of target processes, the setting value α6 corresponding to non-contact charging is −70 dBm, and the setting value α5 corresponding to USB communication is −75 dBm. The control unit 2 sets the set value α6 as a determination threshold value.

  Also, some or all of the set values α1 to α6 may be set larger than the initial value α0.

  Thus, since the control part 2 adjusts a determination threshold value according to the operation condition of the electronic device 1, it can set a determination threshold value appropriately. That is, even when the operation state of the electronic device 1 is an operation state where the noise level in the FM radio band is high, the control unit 2 sets the determination threshold value to the frequency of each channel as in FIG. It is possible to set between RSSI and noise level. Therefore, the reception channel selection unit 105 can appropriately find a receivable channel frequency by executing a search process using the determination threshold adjusted by the control unit 2. As a result, the search stop can function properly.

  In addition, since the control unit 2 adjusts the determination threshold based on whether or not non-contact charging is being performed, even when the noise level increases during non-contact charging, reception channel selection is performed. The unit 105 can appropriately find a receivable channel frequency.

  In addition, since the control unit 2 adjusts the determination threshold based on whether or not communication such as CDMA communication is being performed, the reception channel selection is performed even when the noise level increases during communication. The unit 105 can appropriately find a receivable channel frequency.

  The control unit 2 that is executing the FM radio application may set the determination threshold value to an initial value when the user does not perform any operation on the FM radio screen 300 for a predetermined time or longer.

  The receiving circuit 10 is a circuit that receives FM radio signals, but may be a circuit that receives other types of radio signals. For example, the receiving circuit 10 may be a circuit that receives AM (Amplitude Modulation) radio signals transmitted from a plurality of AM radio channels, or a circuit that receives television broadcast signals transmitted from a plurality of TV broadcast channels. It may be.

  In addition, the reception channel selection unit 105 may perform a full search for searching for a receivable channel frequency over the entire region of the FM radio band in one search process without performing a search stop. The reception channel selection unit 105 may be capable of executing both search stop and full search.

  Further, when at least two target processes are being executed at the same time, there is a possibility that the noise level will be higher than when one target process included in the at least two target processes is being executed. Therefore, as shown in FIG. 10, the setting value table 400 may include setting values according to the noise level in the FM radio band when at least two target processes are simultaneously executed. That is, the setting value table 400 may include setting values corresponding to a combination of at least two target processes that are executed simultaneously.

  For example, when the CDMA communication and the LTE communication are simultaneously performed in the electronic device 1, the setting value table 400 includes an FM radio when the CDMA communication and the LTE communication are simultaneously performed as illustrated in FIG. A setting value α7 (setting value corresponding to a combination of CDMA communication and LTE communication) corresponding to the noise level in the band may be included.

  When the CDMA communication, the LTE communication, and the Bluetooth communication are simultaneously performed in the electronic device 1, the setting value table 400 includes the FM radio band when the CDMA communication, the LTE communication, and the Bluetooth communication are simultaneously performed. May include a set value α8 (a set value corresponding to a combination of CDMA communication, LTE communication, and Bluetooth communication) according to the noise level.

  Further, when CDMA communication, LTE communication, Bluetooth communication, and contactless charging are simultaneously executed in the electronic device 1, the setting value table 400 simultaneously executes CDMA communication, LTE communication, Bluetooth communication, and contactless charging. A setting value α9 (setting value corresponding to a combination of CDMA communication, LTE communication, Bluetooth communication, and non-contact charging) according to the noise level in the FM radio band at the time may be included.

  As described above, when the setting value table 400 includes setting values corresponding to a combination of at least two target processes to be executed at the same time, the control unit 2 determines that at least two target processes are being executed at the same time. The setting value corresponding to the combination of the at least two target processes is set as the determination threshold value. The setting value table 400 may include setting values corresponding to each of all combinations of at least two target processes that may be executed simultaneously among a plurality of target processes including CDMA communication and LTE communication. preferable.

<Modification>
FIG. 11 is a flowchart illustrating the operation of the control unit 2 of the electronic device 1 according to the modification. In the modified example, the control unit 2 obtains an interval between a plurality of frequencies specified as receivable channel frequencies by executing the search process, and adjusts the determination threshold based on the obtained interval. The control unit 2 functions as an acquisition unit that obtains an interval between a plurality of frequencies specified as receivable channel frequencies by executing the search process. The control unit 2 performs the process shown in FIG. 11 while the FM radio application is being executed.

  As illustrated in FIG. 11, the control unit 2 that is executing FM radio resets the values in the first to third registers that it has in step s21. Then, when the control unit 2 recognizes a long tap operation on the transition button 302 included in the FM radio screen 300 based on the detection signal from the touch panel 13, the control unit 2 outputs a search execution instruction to the reception channel selection unit 105 in step s22. To do. Receiving channel selection section 105 that has received the search execution instruction executes search processing.

  Next, in step s23, the control unit 2 determines whether or not a receivable channel frequency has been found in the search process in the reception channel selection unit 105. When determining that the receivable channel frequency is found, the control unit 2 stores the found receivable channel frequency, that is, the search stop frequency in the first register in step s24. On the other hand, when determining that no receivable channel frequency has been found in the search process, the control unit 2 sets a determination threshold value to an initial value in step s34.

  Thereafter, when recognizing a long tap operation on the transition button 302, the control unit 2 outputs a search execution instruction to the reception channel selection unit 105 in step s25. Receiving channel selection section 105 that has received the search execution instruction executes search processing.

  Next, in step s26, the control unit 2 determines whether or not a receivable channel frequency has been found in the search process in the reception channel selection unit 105. When determining that the receivable channel frequency is found, the control unit 2 stores the found receivable channel frequency, that is, the search stop frequency in the second register in step s27. On the other hand, if the control unit 2 determines that no receivable channel frequency has been found in the search process, it executes step s34 to set the determination threshold value to an initial value.

  Thereafter, when recognizing a long tap operation on the transition button 302, the control unit 2 outputs a search execution instruction to the reception channel selection unit 105 in step s28. Receiving channel selection section 105 that has received the search execution instruction executes search processing.

  Next, in step s29, the control unit 2 determines whether or not a receivable channel frequency has been found in the search process in the reception channel selection unit 105. When determining that the receivable channel frequency is found, the control unit 2 stores the found receivable channel frequency, that is, the search stop frequency in the third register in step s30. On the other hand, if the control unit 2 determines that no receivable channel frequency has been found in the search process, it executes step s34 to set the determination threshold value to an initial value.

  After step s30, in step s31, the control unit 2 obtains the absolute value of the difference between the value in the first register and the value in the second register. Further, in step s31, the control unit 2 obtains the absolute value of the difference between the value in the second register and the value in the third register. Each of the two absolute values obtained in step s31 indicates an interval between a plurality of frequencies specified as receivable channel frequencies by executing the search process. In other words, each of the two absolute values indicates an interval between two search stop frequencies obtained by two consecutive search processes.

  Next, in step s32, the control unit 2 determines whether or not both of the two absolute values obtained in step s31 are equal to or less than a threshold value. This threshold is set to 500 kHz, for example. When determining that each absolute value is equal to or less than the threshold value, the control unit 2 increases the determination threshold value by a predetermined value in step s33. The predetermined value is, for example, 5 dB, and the control unit 2 increases the determination threshold value by 5 dB.

  As shown in FIGS. 5 and 6 described above, the frequency interval of a plurality of FM radio channels that can be received in a certain area is about 1 MHz or more. Therefore, if the determination threshold is appropriately set as shown in FIG. 5, the interval between the plurality of frequencies (interval between the plurality of search stop frequencies) specified as the receivable channel frequency by the execution of the search process is as follows. 1MHz or more.

  On the other hand, when the noise level is large and the determination threshold is set near or below the noise level, the interval between the plurality of frequencies specified as the receivable channel frequencies by the execution of the search process is 1 MHz. Than enough. When the determination threshold is set to be lower than the noise level as in the example of FIG. 6, the interval between the plurality of frequencies specified as the receivable channel frequencies by performing the search process is a transition step, that is, 100 kHz. Or it becomes about 200 kHz.

  As described above, when each absolute value obtained in step s31 is 500 kHz or less, the control unit 2 increases the determination threshold value because the noise level of the FM radio band is high. That is, when the interval between the plurality of frequencies specified as receivable channel frequencies by the execution of the search process is 500 kHz or less, the control unit 2 determines that the noise level of the FM radio band is large and increases the determination threshold value. doing. As a result, the determination threshold value is appropriately set, and the receivable channel frequency can be appropriately found. Therefore, the search stop can function appropriately. The threshold value used in step s32 is set to a value smaller than the minimum value of the frequency interval between two adjacent FM radio channels in the FM radio band. The threshold value does not necessarily need to be smaller than the minimum value. The threshold value is set to a value larger than the transition step.

  After executing step s33, the control unit 2 executes step s21 again to reset the values in the first to third registers. Thereafter, the control unit 2 operates in the same manner. In the example of FIG. 11, the determination threshold value is gradually increased until each absolute value obtained in step s31 becomes larger than the threshold value.

  As described above, the control unit 2 obtains intervals of a plurality of frequencies specified as receivable channel frequencies by executing the search process, and adjusts the determination threshold based on the obtained intervals. Thereby, the control unit 2 can appropriately set the determination threshold value, and as a result, the reception channel selection unit 105 can appropriately find the receivable channel frequency.

  If the noise level becomes small due to a change in the operating state of the electronic device 1 after the noise level has increased and the determination threshold value has been increased, the determination threshold value is too large and is received in the search process. Possible channel frequency may not be found. Assuming such a situation, in the example of FIG. 11, when it is determined in steps s23, s26, and 29 that no receivable channel frequency is found, step s34 is executed and the determination threshold value is initialized. It becomes. Thereby, even if the noise level fluctuates, the determination threshold can be set appropriately.

  In the example of FIG. 11, the control unit 2 obtains two absolute values and increases the determination threshold value when both of the two absolute values are equal to or less than the threshold value. The determination threshold value may be increased when the obtained absolute value is equal to or less than the threshold value. Further, the control unit 2 may obtain three or more absolute values and increase the determination threshold value when both of the three or more absolute values are equal to or less than the threshold value.

  In step s32, it is determined whether or not each absolute value is smaller than a threshold value. If each absolute value is smaller than the threshold value, the determination threshold value may be increased.

  As shown in FIG. 12, the process shown in FIG. 11 may be executed when at least one of communication and non-contact charging is being executed in the electronic device 1. In the example illustrated in FIG. 12, the control unit 2 determines whether at least one of communication and non-contact charging is performed in the electronic device 1 in step s41, as in step s121 described above. In step s41, if the control part 2 determines with at least one of communication and non-contact charge being performed in the electronic device 1, it will perform step s21 and will reset the value in a 1st-3rd register | resistor. Thereafter, the control unit 2 operates in the same manner. On the other hand, if the control unit 2 determines that communication and non-contact charging are not performed in the electronic device 1, the control unit 2 executes step s34 and sets the determination threshold value to an initial value. Thereafter, the control unit 2 executes step s41 and thereafter operates in the same manner.

  As described above, when at least one of communication and non-contact charging is executed, that is, when the noise level is high, the determination threshold is appropriate by executing the processing after step s21. It can suppress that the process after step s21 is performed. That is, it is possible to suppress unnecessary processing from being executed.

  As mentioned above, although the electronic device 1 was demonstrated in detail, above-described description is an illustration in all the phases, Comprising: This indication is not limited to it. The various modifications described above can be applied in combination as long as they do not contradict each other. And it is understood that the countless modification which is not illustrated can be assumed without deviating from the scope of this disclosure.

DESCRIPTION OF SYMBOLS 1 Electronic device 2 Control part 3 1st wireless communication part 4 2nd wireless communication part 5 3rd wireless communication part 6 4th wireless communication part 11 Wired communication part 105 Reception channel selection part (search processing part)
150 battery

Claims (6)

An electronic device capable of receiving signals of a plurality of channels to which different frequencies are assigned,
A search processing unit that performs a search process for searching for a frequency of a receivable channel based on a comparison result of comparing a value indicating a reception state at the reception frequency with a threshold value while changing the reception frequency. ,
An electronic device comprising: a threshold value adjusting unit that adjusts the threshold value according to an operation state of the electronic device. The electronic device according to claim 1,
A battery that can be contactlessly charged;
The threshold adjustment unit is an electronic device that adjusts the threshold based on whether or not the non-contact charging is being performed. The electronic device according to any one of claims 1 and 2,
A communication unit that communicates with an external device;
The threshold value adjustment unit is an electronic device that adjusts the threshold value based on whether or not the communication is being executed. An electronic device according to any one of claims 1 to 3,
An acquisition unit for obtaining a first interval of a plurality of frequencies specified as frequencies of receivable channels by executing the search process;
The threshold value adjusting unit increases the threshold value when the first interval is smaller than a predetermined value or less than the predetermined value. The electronic device according to claim 4,
The acquisition unit obtains second intervals of a plurality of frequencies specified as frequencies of channels that can be received by execution of the search process using the threshold value increased by the threshold value adjustment unit,
The threshold value adjusting unit is an electronic device that further increases the threshold value when the second interval is smaller than or less than the predetermined value. An operation method of an electronic device capable of receiving signals of a plurality of channels to which different frequencies are assigned,
A step of performing a search process for searching for a frequency of a receivable channel based on the comparison result by comparing a threshold value with a value indicating a reception state at the reception frequency while transitioning the reception frequency;
Adjusting the threshold according to the operating status of the electronic device.

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