JP2010183300A - Communication terminal, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent deterioration in reception sensitivity, when there is a generation source of harmonics. <P>SOLUTION: In a mobile communication terminal 1 having a communication section 120 which receives communication radiowaves including CDMAs and a broadcast-receiving section 130 which receives broadcasting wave, such as one segment broadcasting, a plurality of operation frequencies which do not interfere in a frequency band of the communication radiowaves which the communication section 120 receives are specified by a candidate frequency specification section 113. A broadcast reception control section 111 discriminates whether the operating frequency generated in a display section 160 interferes in the frequency band of the broadcasting waves to be received, by taking advantage of a receiving operation about the broadcasting wave by the broadcast receiving section 130; and when it is discriminated that the operating frequency interferes in the frequency band, an operation frequency selection section 114 selects an operation frequency which does not interfere in the frequency band to be received by the broadcast receiving section 130 from among the plurality of specified operation frequencies. An operation control section 115 performs control so that the display section 160 operates at the operating frequency selected. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a communication terminal and a program, and more particularly, to a communication terminal and a program suitable for using a high-definition display.

  Some mobile communication terminals such as mobile phones have a function of receiving a digital broadcast such as a so-called one-segment broadcast in addition to a call function which is a basic function. With the mounting of such functions, display devices with higher definition are required.

  When the display device has a higher definition, the display clock tends to have higher harmonics. In this case, there is a problem that the harmonics of the display device may overlap with the frequency band used for receiving the digital broadcast, and the reception sensitivity deteriorates.

  In order to avoid such a problem, a technique for selecting an optimum display clock for each reception channel is known (for example, Patent Document 1).

Japanese Utility Model Publication No. 5-65184

  However, the technique of Patent Document 1 can cope with the deterioration of the reception performance for broadcasting, but does not consider the influence of the harmonics of the display device on the telephone call or data communication.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a mobile communication terminal and a program that do not deteriorate the reception sensitivity even when a harmonic generation source is present.

In order to achieve the above object, a communication terminal according to the first aspect of the present invention provides:
In a communication terminal equipped with a receiving means capable of receiving at least two types of radio waves,
Frequency specifying means for specifying a plurality of operating frequencies that are harmonics that do not interfere with the frequency band of one radio wave received by the receiving means;
An interference discriminating means for discriminating whether or not the harmonic of the operating frequency specified by the frequency specifying means interferes with a frequency band received by the receiving operation, triggered by the receiving operation of the other radio wave by the receiving means; ,
A frequency selection means for selecting an operating frequency that is a harmonic that does not interfere with a frequency band received for the other radio wave among the plurality of operating frequencies specified by the frequency specifying means when the interference determining means determines that interference occurs; ,
Operation control means for controlling the harmonic generation source to operate at the operating frequency selected by the frequency selection means;
It is characterized by providing.

In the above communication terminal,
The other radio wave is preferably a broadcast wave, in this case,
The interference discriminating means determines whether or not the harmonic of the operating frequency specified by the frequency specifying means interferes with the frequency band of the broadcast wave received by the receiving means when the receiving means receives the broadcast wave. It is desirable to make such a determination.

In the above communication terminal,
The one radio wave can be a communication radio wave.
The frequency specifying means preferably specifies a plurality of operating frequencies that do not interfere with the frequency band of the communication radio wave.

In the above communication terminal,
The frequency selection means preferably selects a lower frequency when there are a plurality of selectable operating frequencies.

In the above communication terminal,
The generation source of the operating frequency can be a display device of the communication terminal, in this case,
Preferably, the operation control means controls the display device so that a display clock frequency of the display device becomes a frequency selected by the frequency selection means.

Also in this case
The operation control means may control the display device so that the data bus operating frequency in the display device becomes the frequency selected by the frequency selection means.

The communication terminal
It is desirable to further include at least frequency information storage means that stores information indicating a frequency band for radio waves that can be received by the reception means.
It is desirable that the interference determination unit performs determination based on information stored in the frequency information storage unit.

in this case,
The frequency information storage means preferably stores information including either a multiplication ratio or a frequency division ratio of the operating frequency.

In order to achieve the above object, a program according to the second aspect of the present invention is:
A computer that controls a communication terminal equipped with a receiving means capable of receiving at least two types of radio waves,
A function of specifying a plurality of operating frequencies that are harmonics that do not interfere with the frequency band of one radio wave received by the receiving means;
A function of determining whether or not the harmonic of the specified operating frequency interferes with a frequency band received in the receiving operation, triggered by a receiving operation of the other radio wave by the receiving unit;
A function of selecting an operating frequency that is a harmonic that does not interfere with a frequency band received for the other radio wave among the plurality of operating frequencies specified when the interference is determined;
A function of controlling the source of the harmonics to operate at the selected operating frequency;
It is characterized by realizing.

  According to the present invention, it is possible to prevent deterioration in reception sensitivity even when there is a source of harmonics.

It is a block diagram which shows the structure of the mobile communication terminal concerning embodiment of this invention. It is a block diagram which shows the structure of the display part shown in FIG. It is a functional block diagram which shows the function implement | achieved by the control part shown in FIG. It is a flowchart for demonstrating the "operating frequency control process" concerning embodiment of this invention. FIG. 2 is a diagram illustrating an example of information stored in a storage unit illustrated in FIG. 1, where (a) illustrates an example of a “frequency band table” and (b) illustrates an example of a “selection candidate frequency table”. It is a figure for demonstrating the operation | movement which selects a frequency candidate.

  Embodiments according to the present invention will be described below with reference to the drawings.

(Embodiment 1)
The mobile communication terminal 1 according to the present embodiment is assumed to have a television broadcast receiving function as an additional function in addition to the call / data communication function which is a basic function. The call / data communication function in this case is based on so-called cellular communication. As for the television broadcast reception function, it is assumed that one-segment broadcast, which is a kind of digital television broadcast, can be received. The configuration of such a mobile communication terminal 1 will be described with reference to FIG. FIG. 1 is a block diagram showing the configuration of the mobile communication terminal 1.

  As illustrated, the mobile communication terminal 1 includes a control unit 110, a communication unit 120, a broadcast receiving unit 130, an audio processing unit 140, an operation unit 150, a display unit 160, a storage unit 170, and the like.

  The control unit 110 includes, for example, a CPU (Central Processing Unit), a RAM (Random Access Memory) serving as a work area, and the like, and each unit of the mobile communication terminal 1 by executing a predetermined operation program. To control. That is, each component of the mobile communication terminal 1 is controlled by the control unit 110, and information transmission between the components is performed via the control unit 110.

  The communication unit 120 has a configuration related to wireless access when the mobile communication terminal 1 performs communication (cellular communication). For example, a communication method such as a CDMA (Code Division Multiple Access) method is used. It is configured by a communication device or the like, and performs wireless communication with a nearby base station by performing wireless transmission / reception by the antenna 121 corresponding to the communication method.

  The broadcast receiving unit 130 is configured to receive a digital broadcast such as a one-segment broadcast, for example, and is used to select a receiving circuit for decoding and demodulating a broadcast wave received by the antenna 131 and a channel to be viewed. It consists of a tuning circuit (tuner).

  The audio processing unit 140 includes, for example, a codec circuit for audio data, and performs processing related to audio input / output of the mobile communication terminal 1. That is, the reception operation of converting the digital audio data received by the communication unit 120 into an analog audio signal and outputting it from the speaker 141, or converting the user's utterance voice input from the microphone 142 into the digital audio data to the communication unit 120 Perform the transmission operation to send out. When the broadcast wave is received by the broadcast receiving unit 130, the received audio data is output from the speaker 141 or the like.

  The operation unit 150 includes, for example, buttons and keys configured on the outer surface of the casing, and is operated by the user of the mobile communication terminal 1. The operation unit 150 includes an input circuit connected to each button, key, and the like, generates an input signal corresponding to a user operation, and inputs the input signal to the control unit 110.

  The display unit 160 includes, for example, a display device such as a liquid crystal display device, a control circuit that controls the display device, and the like, and displays and outputs an image and the like under the control of the control unit 110. The configuration of the display unit 160 according to the present embodiment will be described with reference to FIG.

  As illustrated, the display unit 160 includes a display control unit 161, a phase-locked loop (PLL) 162, an oscillator 163, a signal line 164, a display device 165, and the like.

  The display control unit 161 is configured by, for example, an LSI (Large Scale Integration) or the like, and drives and controls the display device 165 based on display data and control signals sent from the control unit 110. In this case, the display control unit 161 transmits data indicating the display image to the display device 165 (data bus). The operation of the data bus is performed based on a so-called bus operating frequency, and this bus operating frequency is variable under the control of the control unit 110.

The display control unit 161 includes a phase synchronization circuit (PLL) 162, and displays the frequency by dividing and multiplying the oscillation frequency by the oscillation operation of the connected oscillator 163 based on the control by the control unit 110. A display clock of the device 165 is generated. The oscillator 163 is composed of, for example, a crystal oscillator or the like, and serves as an original oscillation of a display clock. The original frequency generated by the oscillator 163 is “f _ref ”.

  The signal line 164 includes, for example, a flexible cable (so-called flexible), and transmits image data from the display control unit 161 and a display clock signal generated by the phase synchronization circuit (PLL) 162 to the display device 165.

  The display device 165 includes, for example, a liquid crystal display panel, and displays and outputs image data transmitted via the signal line 164. In this case, the display device 165 performs a display operation at the frequency (display clock frequency) of the clock signal generated by the phase synchronization circuit (PLL) 162.

The display clock frequency in this case is assumed to be one clock output per pixel (so-called pixel clock), and “(vertical display pixel number + vertical non-display pixel number) × (horizontal display pixel number + horizontal It is assumed that “number of non-display pixels) × frame rate”. For example, when the display device 165 has a resolution of 800 × 480 pixels and a frame rate of 60 to 67 fps (Frames Per Second), the display clock frequency is about 26 MHz to 29 MHz. The lower limit of the display clock frequency usable in the display unit 160 is “f _min ” and the upper limit is “f _max ”.

  Returning to FIG. 1, the description of the configuration of the mobile communication terminal 1 will be continued.

  The storage unit 170 is configured by a storage device such as a flash memory, for example, and stores various data necessary for realizing the present invention in addition to storing an operation program executed by the control unit 110.

  The above is the main configuration of the mobile communication terminal 1 according to the present embodiment, but these are the configurations necessary for realizing the present invention, and for realizing the main functions and additional functions of the mobile communication terminal. It is assumed that other necessary configurations are appropriately provided.

  The operation of the mobile communication terminal 1 configured as above will be described. As described above, the mobile communication terminal 1 according to the present embodiment has a communication function using cellular communication and a reception function for one-segment broadcasting. Here, in the configuration of the display unit 160 as shown in FIG. 2, if the display device 165 is high definition, the display clock frequency and the bus operation frequency become high, and these harmonics become noise radiation and become a signal. Emission from line 164.

  When the frequency of such noise radiation overlaps (interfers with) the reception frequency of communication performed by the communication unit 120 and the frequency of the broadcast wave received by the broadcast reception unit 130, these reception sensitivities deteriorate. There is. Therefore, in the present embodiment, control is performed so that the display unit 160 operates at an operating frequency that does not degrade the reception sensitivity.

  In order to perform such an operation, the control unit 110 executes the operation program stored in the storage unit 170, thereby realizing the function shown in FIG. As illustrated, the control unit 110 functions as a broadcast reception control unit 111, a communication control unit 112, a candidate frequency specifying unit 113, an operation frequency selection unit 114, an operation control unit 115, and the like.

  The broadcast reception control unit 111 controls the broadcast reception unit 130 based on an input signal or the like generated by operating the operation unit 150, and controls a broadcast radio wave reception operation (reception start, reception end, channel change, etc.). To do. Also, the broadcast reception control unit 111 has a display clock frequency at which the display unit 160 is operated and a frequency used in a broadcast wave channel (hereinafter referred to as “broadcast reception channel”) received by the broadcast reception unit 130. It is determined whether or not interference occurs.

  The communication control unit 112 controls the communication unit 120 to perform a communication operation related to call / data communication, and when the broadcast reception control unit 111 determines that the display clock frequency and the frequency of the broadcast reception channel interfere with each other, The reception frequency band used in the communication operation of the communication unit 120 is specified.

  The candidate frequency specifying unit 113 selects an operating frequency (= display clock frequency) that does not interfere with the reception frequency band used in the communication operation specified by the communication control unit 112 in the range of operating frequencies that can be used by the display unit 160. The operation frequency (display clock frequency) to be selected is specified as a candidate.

  The operating frequency selection unit 114 selects a plurality of operating frequencies (display clock frequencies) including at least an operating frequency (display clock frequency) that does not interfere with the broadcast reception channel from the candidates specified by the candidate frequency specifying unit 113.

  The operation control unit 115 controls the display unit 160 so that the display unit 160 operates at the operation frequency selected by the operation frequency selection unit 114. In the present embodiment, the phase synchronization circuit (PLL) 162 is controlled so that the display clock frequency generated by the phase synchronization circuit (PLL) 162 becomes the frequency selected by the operating frequency selection unit 114.

  Processing executed by the functional configuration as described above will be described. Here, the “operating frequency control process” executed when the mobile communication terminal 1 configured as described above performs screen display will be described with reference to the flowchart shown in FIG. This “operating frequency control process” is started when the mobile communication terminal 1 is activated, for example.

  When the process is started, the communication control unit 112 specifies the reception frequency band currently used in the communication operation of the communication unit 120 (step S101). Here, a “frequency band table” as shown in FIG. 5A is stored in the storage unit 170 in advance. In this “frequency band table”, information indicating the frequency band for each channel is stored for each of the broadcast radio wave received by the broadcast receiving unit 130 and the communication radio wave received by the communication unit 120, as shown in the figure. . That is, the frequency values of the lower limit, center, and upper limit of the frequency band are recorded for each channel. By referring to such a “frequency band table”, the communication control unit 112 identifies the bandwidth of the reception frequency band used for the communication operation by the communication unit 120 (hereinafter referred to as “communication frequency band”). .

  When the communication frequency band is specified by the communication control unit 112, the candidate frequency specifying unit 113 is a display clock frequency range that can be used for the operation of the display unit 160, and a plurality of display clock frequency candidates that do not interfere with the communication frequency band ( Hereinafter, “candidate frequency” is specified (step S102).

  Here, it is assumed that a “selection candidate frequency table” as shown in FIG. 5B is stored in the storage unit 170, and the candidate frequency specifying unit 113 first refers to this “selection candidate frequency table”. Then, candidate frequencies are specified.

Here, the candidate frequencies recorded in the “selected candidate frequency table” are a plurality of display clock frequencies obtained by multiplying / _{dividing the} original oscillation frequency f _ref by the oscillator 163. That is, as shown in FIG. 5B, candidate frequencies obtained from combinations of a plurality of multiplication numbers and frequency division numbers are recorded in the “selection candidate frequency table”. The candidate frequency recorded here is obtained by, for example, “original oscillation frequency f _ref × multiplication number ÷ (frequency division number × 2)”.

Then, the candidate frequency specifying unit 113 specifies a display frequency clock range that can be used by the display unit 160, that is, a frequency within the range of f _{min to} f _max as a candidate frequency.

In this way, when display clock frequency candidates that can be used in the display unit 160 are identified, the operating frequency selection unit 114 selects the communication frequency band in which the harmonics are identified in step S101 from among these candidate frequencies. Specify a display clock frequency that does not interfere with. Here, a value obtained by multiplying the candidate frequency obtained by multiplying / _dividing the original oscillation frequency f _ref by an integer is specified so as not to overlap the communication frequency band. That is, as shown in FIG. 6, it is assumed that a frequency α or a frequency β whose value multiplied by an integer is out of the range of the communication frequency band is a display clock frequency that does not interfere with the communication frequency band. Display clock frequencies whose multiplied value falls within the communication frequency band are excluded from the target.

  The operation control unit 115 sets one of the display clock frequencies specified by the operation frequency selection unit 114 as a default, and controls the phase synchronization circuit (PLL) 162 (step S103). That is, when the display unit 160 operates at such a display clock frequency, the reception sensitivity of communication does not deteriorate with the harmonics generated at that time.

  Here, when the user of the mobile communication terminal 1 operates the operation unit 150 to perform an operation for starting a broadcast reception operation, the broadcast reception control unit 111 receives a broadcast from an input signal from the operation unit 150. It is determined that an operation start instruction has been input (step S104: Yes). In this case, the broadcast reception control unit 111 inquires of the operation control unit 115 about the display clock frequency of the display unit 160, and whether or not the display clock frequency interferes with the frequency band of the broadcast reception channel received by the broadcast reception unit 130. Is determined (step S105).

  The broadcast reception control unit 111 specifies the frequency bandwidth for the broadcast reception channel to be received by the broadcast reception unit 130 by referring to the “frequency band table” stored in the storage unit 170. Then, when a value obtained by multiplying the display clock frequency that operates the display unit 160 by an integer is within the frequency band range of the broadcast reception channel, it is determined that interference occurs.

  When the display clock frequency interferes with the broadcast reception channel (step S105: Yes), the operating frequency selection unit 114 determines the broadcast reception channel from the display clock frequency specified in step S102, where the harmonic does not interfere with the communication frequency band. At least one display clock frequency that does not interfere is selected as a candidate (step S106).

  Here, in the case of the one-segment broadcasting assumed in this embodiment, since the broadcasting is performed in 50 ch from 13 ch to 62 ch every 6 MHz, the display clock frequency that does not overlap all of these is extremely small. In this case, two or more display clock frequencies can be selected. If these display clock frequencies are separated from each other, the channels that overlap the reception band of the one-segment broadcast are different. Therefore, a plurality of display clock frequencies including at least a display clock frequency that does not interfere with the broadcast reception channel are selected, and one display clock frequency is set as a basic operation frequency, and only the channel that overlaps the reception band of the one-segment broadcast is transmitted to the other channel. By using this operating frequency, it is possible to avoid the deterioration of sensitivity at the time of broadcast reception due to the display clock.

  In selecting the display clock frequency in this way, if there are two or more candidates for the corresponding display clock frequency (step S107: Yes), the operating frequency selection unit 114 preferentially selects a lower frequency (step S107). S108). This is because, as the display clock frequency is higher, the power consumption for driving the display unit 160 may be higher, so that the power consumption can be reduced by selecting a lower display clock frequency.

  When the display clock frequency is selected by the operation frequency selection unit 114, the operation control unit 115 controls the phase synchronization circuit (PLL) 162 so as to generate the selected display clock frequency (step S109). Since the harmonic component radiated when the display device 165 is driven at such a display clock frequency is out of the frequency band of the broadcast reception channel received by the broadcast receiving unit 130, the reception sensitivity related to the broadcast reception. Can be avoided.

  In addition, since the display clock frequency that is a harmonic that does not interfere with the communication frequency band is selected, for example, the reception sensitivity of the communication operation (for example, location registration operation) performed in the background of the broadcast reception operation is deteriorated. Nor.

  As described above, while the display unit 160 is operated at a display clock frequency that is a harmonic that does not deteriorate the reception sensitivity of either broadcast or communication, a predetermined end event (for example, a broadcast reception operation end instruction or the like) is generated. The above processing is performed until it occurs (step S110: No).

  In this case, when the user of the mobile communication terminal 1 operates the operation unit 150 to change the received broadcast reception channel (step S104: Yes), the operations in steps S105 to S109 are performed. Thus, a display clock frequency that is a harmonic that does not deteriorate the reception sensitivity of the broadcast reception channel after the change is selected.

  In this case, when the harmonic of the display clock frequency set at that time interferes with the changed frequency band of the broadcast reception channel (step S105: Yes), the above-described operation is performed. That is, the display clock frequency of the harmonic that does not deteriorate the reception sensitivity of the broadcast radio wave is selected by the change of the broadcast reception channel. This is because the frequency used for the communication operation cannot normally be arbitrarily changed on the mobile communication terminal 1 side, but the broadcast reception channel can be arbitrarily changed by the user of the mobile communication terminal 1.

  Then, the process ends when a predetermined end event occurs (step S110: Yes).

(Embodiment 2)
In the first embodiment, the case where the display clock frequency that does not deteriorate the reception sensitivity of broadcasting and communication is selected, but the operation frequency of the data bus that does not deteriorate the reception sensitivity is selected by the same operation. Also good.

  Generally, the operating frequency of the data bus is about ½ of the display clock frequency. However, the lower the operating frequency, the higher the harmonic components, so the appropriate data bus frequency (maximum operating frequency) must be set. By selecting, it is possible to more effectively prevent deterioration of reception sensitivity due to harmonics.

  As described above, by applying the present invention as in the above-described embodiment, it is possible to effectively prevent deterioration in reception sensitivity due to harmonics generated in a high-definition display device or the like.

  In other words, two or more different types of radio waves can be received because an operating frequency that does not interfere with either the frequency band used for speech or data communication or the frequency band used for receiving digital television broadcasts is selected. Even in such mobile communication terminals, it is possible to effectively prevent deterioration of reception sensitivity due to harmonics of a display device or the like.

  In this case, since the operation frequency selection operation that does not deteriorate the reception sensitivity is performed when the reception channel of the broadcast radio wave that can be arbitrarily changed is changed, the deterioration of the reception sensitivity can be efficiently prevented. it can.

  Here, when there are a plurality of selectable operating frequencies, a lower frequency is selected, so that power consumption can be reduced.

  Further, since a frequency that does not interfere with the frequency band used for broadcasting and communication is selected for the display clock frequency of the display device that is likely to generate harmonics, it is possible to effectively prevent deterioration in reception sensitivity.

  Further, by selecting a frequency that does not interfere with a frequency band used for broadcasting and communication for a data bus frequency that is more likely to generate harmonics, it is possible to more effectively prevent reception sensitivity from being deteriorated.

  In addition, by storing in advance the frequency bandwidth of the receivable radio wave and the frequency as a selection candidate, it is possible to quickly select the optimum operating frequency.

  In this case, by storing the frequency using the multiplication ratio or the frequency division ratio as a selection candidate, it is possible to easily cope with the case of changing the resolution of the display device.

  The said embodiment is an example and the application range of this invention is not restricted to this. That is, various applications are possible, and all embodiments are included in the scope of the present invention.

  In the above embodiment, the case where the communication terminal according to the present invention is realized by a mobile communication terminal such as a mobile phone has been exemplified. However, the present invention is not limited to the mobile communication terminal and the present invention is applied to various communication terminals. be able to.

  In the above embodiment, communication radio waves such as CDMA and broadcast radio waves such as one-segment broadcasting are exemplified as two different types of radio waves. However, the present invention is not limited to these, and for example, GPS (Global Positioning System: Global Positioning System) ) Etc. may be targeted. Alternatively, the present invention may be applied to a communication terminal capable of receiving two different types of communication radio waves, such as CDMA and LTE (Long Term Evolution).

  In the above embodiment, the case where the harmonic generation source is a display device has been exemplified. However, the present invention is not limited to this, and the present invention is applied to the operation frequency control of the harmonic generation source that causes the reception sensitivity deterioration. be able to.

  Moreover, it can be made to function as a communication terminal concerning this invention by applying a program not only to the communication terminal previously provided with the structure concerning this invention but the existing communication terminal.

  The application method of such a program is arbitrary. For example, the program can be applied by being stored in a storage medium such as a CD-ROM or a memory card, or can be applied via a communication medium such as the Internet.

DESCRIPTION OF SYMBOLS 1 ... Mobile communication terminal, 110 ... Control part, 111 ... Broadcast reception control part, 112 ... Communication control part, 113 ... Candidate frequency specific part, 114 ... Operating frequency selection part, 115 ... Operation control part, 120 ... Communication part, DESCRIPTION OF SYMBOLS 121 ... Antenna, 130 ... Broadcast receiving part, 131 ... Antenna, 140 ... Sound processing part, 141 ... Speaker, 142 ... Microphone, 150 ... Operation part, 160 ... Display part, 161 ... Display control part, 162 ... Phase synchronization circuit ( PLL), 163 ... oscillator, 164 ... signal line, 165 ... display device, 170 ... storage unit

Claims (9)

In a communication terminal equipped with a receiving means capable of receiving at least two types of radio waves,
Frequency specifying means for specifying a plurality of operating frequencies that are harmonics that do not interfere with the frequency band of one radio wave received by the receiving means;
An interference discriminating means for discriminating whether or not the harmonic of the operating frequency specified by the frequency specifying means interferes with a frequency band received by the receiving operation, triggered by the receiving operation of the other radio wave by the receiving means; ,
A frequency selection means for selecting an operating frequency that is a harmonic that does not interfere with a frequency band received for the other radio wave among the plurality of operating frequencies specified by the frequency specifying means when the interference determining means determines that interference occurs; ,
Operation control means for controlling the harmonic generation source to operate at the operating frequency selected by the frequency selection means;
A communication terminal comprising: The other radio wave is a broadcast wave,
The interference discriminating means determines whether or not the harmonic of the operating frequency specified by the frequency specifying means interferes with the frequency band of the broadcast wave received by the receiving means when the receiving means receives the broadcast wave. To determine whether
The communication terminal according to claim 1. The one radio wave is a communication radio wave,
The frequency specifying means specifies a plurality of operating frequencies that do not interfere with the frequency band of the communication radio wave;
The communication terminal according to claim 1 or 2. The frequency selecting means selects a lower frequency when there are a plurality of selectable operating frequencies.
The communication terminal according to any one of claims 1 to 3. The operating frequency generation source is a display device of the communication terminal,
The operation control means controls the display device so that a display clock frequency of the display device becomes a frequency selected by the frequency selection means;
The communication terminal according to any one of claims 1 to 4, wherein: The operation control means controls the display device so that the data bus operating frequency in the display device becomes the frequency selected by the frequency selection means.
The communication terminal according to claim 5. At least frequency information storage means for storing information indicating a frequency band of radio waves that can be received by the reception means;
The interference determination means performs determination based on information stored in the frequency information storage means.
The communication terminal according to any one of claims 1 to 6. The frequency information storage means stores information including any one of a multiplication ratio or a division ratio of the operating frequency.
The communication terminal according to claim 7. A computer that controls a communication terminal equipped with a receiving means capable of receiving at least two types of radio waves,
A function of specifying a plurality of operating frequencies that are harmonics that do not interfere with the frequency band of one radio wave received by the receiving means;
A function of determining whether or not the harmonic of the specified operating frequency interferes with a frequency band received in the receiving operation, triggered by a receiving operation of the other radio wave by the receiving unit;
A function of selecting an operating frequency that is a harmonic that does not interfere with a frequency band received for the other radio wave among the plurality of operating frequencies specified when the interference is determined;
A function of controlling the source of the harmonics to operate at the selected operating frequency;
A program characterized by realizing.

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