JP2006319891A - Mobile communication device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mobile communication device that can prevent deterioration in receiving performance due to a spurious component generated with higher harmonics of a clock signal and transmitted waves, and can suitably adapt to transmission/reception frequency intervals. <P>SOLUTION: It is decided whether the transmission/reception intervals match higher harmonics of the drive clock signal driving a camera 20. Spurious component is generated with the higher harmonics of the drive clock signal which match or nearly match the transmission/reception intervals and the transmitted wave, and drops into the reception band. The component is made to correspond to the transmission output electric power which is compared with the threshold set previously. When it is decided that the transmission/reception intervals match or nearly match higher harmonics of the driving clock signal of the camera 20; and when it is decided that the transmission output electric power is larger than the threshold, the frequency is changed in the driving clock signal of the camera section 20. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a mobile communication device, for example, a mobile communication device compatible with a simultaneous transmission / reception system equipped with a drive circuit such as an imaging device driven by a clock signal.

  In recent years, with the development of mobile communication devices such as mobile phones, various applications are mounted on commercially available mobile communication devices, and in particular, mounting of an imaging device such as a camera has become an essential specification.

  However, in a mobile communication device equipped with a camera, when the mounting position of the antenna and the mounting position of the camera are close, the reception sensitivity deteriorates due to the influence of the drive clock signal when the camera is driven. Is concerned. For example, when the harmonics of the driving clock signal of the camera match the reception frequency, the reception performance is greatly deteriorated during reception at a low electric field level.

  In order to eliminate such problems, in mobile communication devices such as mobile phones, when the harmonics of the camera drive clock signal match the received frequency, the camera drive clock signal is changed at the timing when the received frequency is received. By doing so, degradation of reception performance is prevented (see, for example, Patent Document 1).

JP 2004-179861 A (paragraph numbers [0039] to [0053], FIGS. 1 to 3 and FIG. 6)

However, in such a conventional mobile communication device, the harmonics of the camera drive clock signal and the reception frequency match, and the electric field level of the reception frequency is lower than a preset threshold value. When it is judged, it is controlled to change the drive clock signal of the camera at the timing of receiving the reception frequency to prevent deterioration of the reception performance, so that it is applied to a mobile communication device that supports the simultaneous transmission / reception method In addition, spurious components generated by the harmonics and transmission waves of the camera drive clock signal fall into the reception band.
For this reason, there has been a problem that deterioration in reception performance cannot be prevented only by performing clock control so that the harmonics of the drive clock signal do not coincide with the reception frequency.

Hereinafter, this mechanism will be described with reference to FIG.
FIG. 4 is a block diagram of the radio unit and the camera unit of the mobile communication device corresponding to the simultaneous transmission / reception system. In FIG. 4, the camera unit 1 is connected to a radio unit, and the radio unit includes a transmission circuit 2 for performing a transmission operation during communication, a reception circuit 3 for performing a reception operation during communication, and a transmission circuit 2. And a duplexer 4 that separates and couples the receiver circuit 3 and an antenna switch 5 that selectively switches a plurality of antennas 6 according to the communication environment. The antenna switch 5 is connected to the antenna 6.

  Here, it is assumed that the wireless unit is in a communication state, the transmission circuit 2 operates at the frequency of the transmission wave ftx, the reception circuit 3 operates at the frequency of the reception wave frx, and the camera unit 1 is driven by the drive clock fc. At this time, a transmission wave and a driving clock signal for driving the camera unit 1 are input to the receiving circuit 3 via the antenna 6.

  At this time, the spurious component fim is generated from the frequency component input to the receiving circuit 3 due to the non-linearity of the receiving circuit 3. The spurious component fim is given by ftx ± fc × n (n is an integer, indicating a harmonic). For example, when ftx = 832.5 MHz, frx = 877.5 MHz, and fc = 9 MHz, fim is 832.5 MHz ± 9 MHz × 5 = 787.5 MHz and 877.5 MHz, and a spurious component of 877.5 MHz that coincides with the reception frequency is generated, leading to deterioration in reception performance.

  In order to avoid this, the drive clock signal of the camera unit 1 is selected so that its harmonics do not coincide with the transmission / reception frequency interval, and control is performed so as not to generate spurious components generated by the transmission wave and coincident with the reception frequency. Need to do.

  In a wireless communication system in which the transmission / reception frequency interval is known, the drive clock signal of the camera unit 1 may be set in advance so that the above-described problem does not occur. When dealing with a plurality of wireless communication systems with different intervals, it is necessary to appropriately control the drive clock signal.

  Specifically, a W-CDMA dual system will be described as an example. When the 2 GHz band W-CDMA system with a transmission / reception frequency interval of 190 MHz and the 800 MHz band W-CDMA system with a transmission / reception frequency interval of 45 MHz are supported, if the drive clock signal of the camera unit 1 is set to 9 MHz, the 2 GHz band In the W-CDMA system, the 21st harmonic is 189 MHz, and the 22nd harmonic is 198 MHz, which does not coincide with the frequency interval 190 MHz of the transmission / reception signal (does not fall into the reception band).

  However, in the 800 MHz band W-CDMA system, the five-fold harmonic becomes 45 MHz, which coincides with the transmission / reception frequency interval of 45 MHz, and falls into the reception band. As described above, in a plurality of wireless communication systems having different transmission / reception frequency intervals, if the driving clock signal of the fixed camera unit 1 is used, it is considered that the reception performance is deteriorated due to the influence of the driving clock signal in one system. It is necessary to appropriately control the drive clock signal of the camera unit 1 so as not to deteriorate the reception performance for both systems.

  Here, in the W-CDMA system given in the above-described example, each frequency channel has a band (W-CDMA: 3.84 MHz band), so that the harmonics and transmission waves of the drive clock signal of the camera unit 1 are transmitted. The spurious component that falls into the reception frequency band generated in the above will also have a band.

  For this reason, if it demonstrates with the example mentioned above, although the spurious component produced | generated by the harmonic and transmission wave of 189 MHz which is 21 times 9 MHz of the drive clock signal of the camera part 1 does not correspond with a receiving frequency, it is a receiving band. Will degrade the reception performance.

  Therefore, even when the transmission / reception frequency interval does not coincide with the harmonics of the drive clock signal of the camera unit 1, it is necessary to control the drive clock signal of the camera unit 1 in consideration of the channel bandwidth.

  Further, since the amplitude level of the spurious component generated by the harmonic and the transmission wave of the drive clock signal of the camera unit 1 is proportional to the amplitude level of the two waves, the amplitude level of the drive clock signal is constant. In other words, the higher the transmission output power, the higher the level of spurious components falling into the reception band, and the deterioration in reception performance increases due to the effect.

  Further, it is necessary to appropriately control the drive clock signal of the camera unit 1 in consideration of the transmission output power. Here, even if the transmission / reception frequency interval matches or is close to the harmonics of the drive clock signal of the camera unit 1, if the transmission output power is sufficiently low, the reception performance is not affected even if the spurious component falls into the reception band. It is possible.

  Therefore, when considering the transmission output power, the transmission output power at the point where the reception performance starts to deteriorate is set in advance as a threshold, and when the transmission output power is greater than or equal to this threshold during communication, the drive clock signal of the camera unit 1 Need to make changes.

  The present invention has been made to solve the above-described problems, and can prevent deterioration in reception performance due to spurious components generated by the harmonics and transmission waves of the clock signal. It is an object of the present invention to provide a mobile communication device that can cope with this.

  The mobile communication device of the present invention is a mobile communication device of a simultaneous transmission / reception system including a drive circuit driven by a clock signal output from a drive control circuit, and a transmission / reception frequency interval coincides with a harmonic of the clock signal. Transmission / reception frequency interval determination means for determining whether the transmission / reception frequency is in the vicinity, transmission output power determination means for comparing the transmission output power with a preset threshold, and the transmission / reception frequency interval matches the harmonics of the clock signal or And a frequency changing means for changing the frequency of the clock signal of the drive control circuit when the transmission output power is determined to be near and the transmission output power is determined to be greater than or equal to the threshold value. ing.

  With this configuration, when the drive control circuit is driven by the clock signal in the mobile communication device that supports the simultaneous transmission / reception method, the transmission / reception frequency interval is equal to or close to the harmonics of the clock signal of the drive control circuit. It is possible to avoid a drop in the reception band of the generated spurious component, and it is possible to prevent deterioration in reception performance. As a result, it is possible to appropriately cope with the transmission / reception frequency interval.

The mobile communication device of the present invention is a simultaneous transmission / reception mobile communication device including an imaging device driven by a clock signal output from a drive control circuit, wherein a transmission / reception frequency interval is a harmonic of the clock signal. Transmission / reception frequency interval determination means for determining whether they match or are close to each other, and transmission output of spurious components that are generated by harmonics and transmission waves of the clock signal that match or are close to the transmission / reception frequency interval and fall into the reception band A transmission output power determination means for comparing the transmission output power with a preset threshold value in association with power, and determining that the transmission / reception frequency interval matches or is close to the harmonics of the clock signal; and When the transmission output power is determined to be greater than or equal to the threshold, the frequency for changing the frequency of the clock signal of the drive control circuit And a one and a changing unit.
With this configuration, when the imaging device is driven by a clock signal in a mobile communication device that supports the simultaneous transmission / reception method, the transmission / reception frequency interval coincides with the harmonics of the imaging device clock signal or is in the vicinity of the frequency. It is possible to avoid falling into the reception band of the spurious component, and it is possible to prevent the reception performance from deteriorating. As a result, it is possible to appropriately cope with the transmission / reception frequency interval.

  Also, the mobile communication device of the present invention is configured such that the clock signal changed by the frequency changing means can be changed to either the high frequency side or the low frequency side of the clock signal before the change. .

  With this configuration, it is possible to adaptively control the clock signal of the drive control circuit and imaging device in consideration of the frequency characteristics of the transmission output power and reception electric field level in each frequency channel, and ensure good reception performance. Can do.

  Further, the transmission / reception frequency interval determining means of the mobile communication device of the present invention is configured to determine whether a plurality of transmission / reception frequency intervals and the clock signal match or are close to each other.

  With this configuration, when applied to a wireless communication system in which the transmission / reception frequency interval changes, it is possible to appropriately control the clock signal of the drive control circuit and the imaging device, so that the spurious component does not fall into the reception band, Good reception performance can be ensured.

Further, the mobile communication device of the present invention is configured by being connected to a plurality of wireless communication systems having different transmission / reception frequency intervals.
With this configuration, it is possible to appropriately control the clock signal of the drive control circuit and the imaging device in consideration of not only the transmission / reception frequency interval of one radio communication system but also the transmission / reception frequency interval of the other radio communication system. Good reception performance can be ensured even in a communication environment.

  As described above, the present invention can prevent reception performance deterioration due to spurious components generated by the harmonics and transmission wave of a clock signal, and can appropriately cope with the transmission / reception frequency interval. Can be provided.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 and FIG. 2 are diagrams showing a first embodiment of a mobile communication device according to the present invention. As a mobile communication device, a mobile communication device having a communication function can be used as a mobile phone, a personal computer, It is applicable to PDA (Personal Digital Assistant) and the like.

  FIG. 1 is a block diagram showing the configuration of the mobile communication device according to the present embodiment, and FIG. 2 shows an example of setting the camera clock signal stored in association with the transmission / reception frequency interval of the mobile communication device according to the present embodiment. FIG.

  First, the configuration will be described. In FIG. 1, a radio unit 11 separates a transmission circuit 12 that performs a transmission operation for a mobile communication system, a reception circuit 13 that performs a reception operation for the mobile communication system, and a transmission circuit 12 and a reception circuit 13. A duplexer 14 to be coupled and an antenna switch 15 for selectively switching a plurality of antennas 16 according to a communication environment are provided. The antenna switch 15 is connected to the antenna 16.

  The radio control unit 17 includes a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), and the like, and detects and processes the transmission output power and the received electric field level in the radio unit 11. The result is output to the camera control unit 18 and the transmission output power determination unit 19 as a channel data signal.

  A transmission output power determination unit (transmission output power determination means) 19 includes a CPU, a ROM, a RAM, and the like, receives a channel data signal of a transmission frequency from the radio control unit 17, and sets a threshold value for setting transmission output power in advance. In contrast, when the transmission output power is greater than or equal to the threshold value, it is output to the camera control unit 18.

  Specifically, the transmission output power determination unit 19 associates the transmission output power with a spurious component generated by the harmonics and transmission wave of the drive clock signal that coincides with or near the transmission / reception frequency interval and falls into the reception band, The transmission output power is compared with a preset threshold value, and when the transmission output power is equal to or greater than the threshold value, it is output to the camera control unit 18.

  The camera control unit 18 includes a CPU, a ROM, a RAM, and the like. The camera control unit 18 receives a channel data signal having a transmission / reception frequency from the wireless control unit 17, and a transmission / reception frequency interval drives a clock signal (hereinafter, an operation clock signal). It is determined whether or not it is coincident with or near the harmonic.

When the camera control unit 18 determines that the transmission / reception frequency interval matches or is close to the harmonic, the transmission output power determination result from the transmission output power determination unit 19 is equal to or greater than a preset threshold value. If it is equal to or greater than the threshold, the setting value of the drive clock signal associated with the transmission / reception frequency interval is read from the setting table shown in FIG. 2 stored in the RAM of the camera control unit 18. The drive clock signal is changed and output to the camera unit 20.
In the present embodiment, the camera control unit 18 constitutes a drive control circuit, a transmission / reception frequency interval determination unit, and a frequency change unit.

Next, frequency change processing will be described.
Here, an example will be described in which the mobile communication device of the present embodiment is connected to an 800 MHz band W-CDMA system corresponding to a variable frequency interval as a wireless communication system.

  First, the initial value setting of the drive clock signal is set to 9 MHz. Assume that in the wireless unit 11, the transmission circuit 12 performs a communication operation at a frequency of 832.5 MHz, the reception circuit 13 performs a communication operation at a frequency of 877.5 MHz, and at the same time, the camera unit 20 is driven by a 9 MHz drive clock signal.

  A transmission signal transmitted from the transmission circuit 12 is transmitted from the antenna 16 via the duplexer 14 and the antenna switch 15. At this time, if the camera unit 20 is driven, a drive clock signal is input to the antenna switch 15 via the antenna 16.

At this time, harmonics of the drive clock signal input to the antenna switch 15 are generated due to the nonlinearity of the antenna switch 15, and spurious components are generated by the harmonics and the transmission wave.
When the frequency is set as described above, the transmission / reception frequency interval is 45 MHz, and the generated spurious component is 877.5 MHz that matches the reception frequency.

  Specifically, the spurious component fim is generated from the frequency component input to the receiving circuit 13, and the spurious component fim is given by ftx ± fc × n (n is an integer, indicating a harmonic).

  Here, since the transmission wave ftx = 832.5 MHz, the reception wave frx = 877.5 MHz, and fc = 9 MHz, fim is 832.5 MHz ± 9 MHz × 5 = 877.5 MHz, and a spurious component that matches the reception frequency is generated. Is done.

  Here, the radio control unit 17 detects and processes the transmission / reception frequency signal from the radio unit 11 and outputs it to the camera control unit 18 and the transmission output power determination unit 19 as a channel data signal.

For example, when the transmission output power is +24 dBm, which is the maximum output, the transmission output power determination unit 19 receives this transmission channel data signal from the radio control unit 17 and compares it with a preset threshold value, for example, −56 dBm. It is determined that the value is equal to or greater than the threshold value, and the result is output to the camera control unit 18.
The camera control unit 18 receives the transmission / reception channel data signal from the wireless control unit 17 and determines whether or not the transmission / reception frequency interval matches or is close to the harmonics of the drive clock signal.

  At this time, since it is a fifth harmonic, the transmission / reception frequency interval is 45 MHz, and the drive clock signal is 9 MHz, the determination is a match. At this time, it is determined whether or not the determination result of the transmission output power from the transmission output power determination unit 19 is equal to or greater than a preset threshold value. The setting value of the drive clock signal stored in association with is read, and the drive clock signal is changed.

  From the setting table of FIG. 2, when the transmission / reception frequency interval is 45 MHz, the drive clock signal is changed to 8.2 MHz. When the drive clock signal is 8.2 MHz, the spurious components generated in the vicinity of the reception band are 873.5 MHz and 881.7 MHz according to the above-described formula, and even if the bandwidth of 3.84 MHz is taken into consideration, it is applied to the band. Therefore, it is possible to avoid degradation of reception performance.

  On the other hand, when the transmission / reception frequency changes such that the transmission frequency is 832.5 MHz and the reception frequency is 882.5 MHz, the transmission / reception frequency interval is 50 MHz, and the sixth harmonic of the drive clock signal 8.2 MHz is 49.2 MHz. The control unit 18 determines that it is in the vicinity, and the 881.7 MHz spurious component generated by the drive clock signal 8.2 MHz and the transmission frequency 832.5 MHz falls into the reception band.

  Further, when the transmission output power determination unit 19 determines that the transmission output power is equal to or greater than a preset threshold value by the same means as described above, the drive clock signal is determined from the set value of the transmission / reception frequency interval 50 MHz. By changing to 9 MHz, it is possible to avoid spurious components falling into the reception band, and to ensure good reception performance.

  As described above, in the present embodiment, it is determined whether the transmission / reception frequency interval matches or is close to the harmonics of the drive clock signal that drives the camera unit 20, and the drive clock that matches or is close to the transmission / reception frequency interval. The spurious component generated by the harmonics of the signal and the transmission wave and falling into the reception band is associated with the transmission output power, the transmission output power is compared with a preset threshold, and the transmission / reception frequency interval is the drive clock of the camera unit 20 The frequency of the drive clock signal of the camera unit 20 is changed when it is determined that the signal harmonics match or are close to each other and the transmission output power is determined to be equal to or greater than the threshold.

  For this reason, in the mobile communication device that supports the simultaneous transmission / reception method, when the camera unit 20 is driven by the drive clock signal, the transmission / reception frequency interval is equal to or close to the harmonics of the drive clock signal of the camera unit 20. Can be prevented from falling into the reception band of the spurious component generated by the above, and deterioration of reception performance can be prevented. As a result, it is possible to appropriately cope with the transmission / reception frequency interval.

  In the present embodiment, the changed drive clock signal may be controlled to either the high frequency side or the low frequency side of the drive clock signal before the change. For example, the transmission / reception frequency interval is 45 MHz when the transmission frequency is 837.5 MHz and the reception frequency is 882.5 MHz, similarly to the transmission frequency of 832.5 MHz and the reception frequency of 882.5 MHz.

  In this case, since the transmission output power and the reception sensitivity in each transmission / reception channel have frequency characteristics, the levels of spurious components generated by the drive clock signal and harmonics and falling into the reception band are also different.

  Therefore, by providing a setting value for changing the drive clock signal to either the high frequency side or the low frequency side, it is possible to perform detailed control in consideration of the frequency characteristics and to ensure good reception performance. .

  In this embodiment, the frequency of the drive clock signal of the camera is changed by applying it to the camera as a drive circuit. However, the present invention is not limited to this, and other application devices such as an LCD (Liquid Crystal Display) and an SD card are used. The present invention may be applied to the reference clock of the transmission system or the reference clock of the transmission system. Even in this way, it is possible to adaptively control a plurality of drive clock signals according to the operation mode of the mobile communication device, and to obtain good reception sensitivity.

FIG. 3 is a diagram showing a second embodiment of the mobile communication apparatus according to the present invention. The same reference numerals are given to the same components as those in the first embodiment, and the description will be omitted.
The mobile communication device of the present embodiment is connected to a plurality of wireless communication systems having different transmission / reception frequency intervals, and the camera control unit 18 determines whether the plurality of transmission / reception frequency intervals coincide with the drive clock signal. It is determined whether it is in the vicinity.

  In FIG. 3, the wireless unit 31 includes a first transmission circuit 32 that performs a transmission operation during communication in the first wireless communication system, and a first reception circuit 33 that performs a reception operation during communication in the first wireless communication system. The second transmission circuit 34 that performs a transmission operation at the time of communication in a second wireless communication system having a transmission / reception frequency interval different from the first wireless communication system, and the second transmission circuit that performs a reception operation at the time of communication of the second wireless communication system A receiving circuit 35; a duplexer 36 that separates and combines the first transmitting circuit 32 and the first receiving circuit 33; and a duplexer 37 that separates and combines the second transmitting circuit 34 and the second receiving circuit 35. And an antenna switch 38 that selectively switches the plurality of antennas 16 according to the communication environment.

Next, frequency change processing will be described.
In the present embodiment, assuming that the first radio communication system is connected to a 2 GHz band W-CDMA system and the second radio communication system is connected to an 800 MHz band W-CDMA system, the transmission / reception frequency of the first radio communication system The interval is 190 MHz, and the transmission / reception frequency interval of the second wireless communication system is 45 MHz.

  When the driving clock signal is set to 8.2 MHz, as described in the first embodiment, the second wireless communication system can avoid reception performance deterioration due to spurious components, but the first wireless communication In the system, the 23rd harmonic of 8.2 MHz is 188.6 MHz, which is in the vicinity of the transmission / reception frequency interval of 190 MHz, and the spurious component falls in the reception band.

  Therefore, in the case of supporting a plurality of wireless communication systems having different transmission / reception frequency intervals in this way, the setting value of the drive clock signal associated with the transmission / reception frequency intervals of both wireless communication systems is stored in the RAM of the camera control unit 18. The drive clock signal can be adaptively changed by storing and reading each set value as needed in the same manner as the processing described in the first embodiment, and reception performance deterioration due to the drive clock signal during communication Can be prevented.

  That is, the camera control unit 18 determines whether or not the different transmission / reception frequency intervals match or are close to the harmonic, and determines that the transmission output power from the transmission output power determination unit 19 is the same when it is determined to match or close. It is determined whether or not the determination result is equal to or greater than a preset threshold value. If the determination result is equal to or greater than the threshold value, it corresponds to the transmission / reception frequency interval from the setting table value of the drive clock signal stored in the RAM of the camera control unit 18. The set value of the attached drive clock signal is read, the drive clock signal is changed, and output to the camera unit 20.

  As described above, in the present embodiment, the camera control unit 18 can determine whether the plurality of transmission / reception frequency intervals and the drive clock signal match or are close to each other. It can be appropriately controlled, and good reception performance can be ensured by preventing spurious components from falling into the reception band.

  In addition, since the mobile communication device of this embodiment is connected to a plurality of radio communication systems having different transmission / reception frequency intervals, not only the transmission / reception frequency intervals of the first radio communication system but also the transmission / reception of the second radio communication system. The drive clock signal of the camera unit 20 can be appropriately controlled in consideration of the frequency interval, and good reception performance can be ensured even in a multimode wireless communication environment.

  As described above, the mobile communication device according to the present invention can prevent the reception performance deterioration due to the spurious component generated by the harmonics and the transmission wave of the clock signal, and can appropriately cope with the transmission / reception frequency interval. It is useful as a mobile communication device or the like compatible with the simultaneous transmission / reception system equipped with a drive circuit such as an imaging device driven by a clock signal.

The block diagram which shows the structure of the mobile communication apparatus of the 1st Embodiment of this invention The figure which shows the example of a setting of the drive clock signal memorize | stored corresponding to the transmission-and-reception frequency interval of the mobile communication apparatus of the 1st Embodiment of this invention The block diagram which shows the structure of the mobile communication apparatus of the 2nd Embodiment of this invention. Block diagram for explaining the spurious component generation mechanism of a mobile communication device supporting the simultaneous transmission / reception system

Explanation of symbols

18 Camera control unit (drive control circuit, transmission / reception frequency interval determination means, frequency change means)
19 Transmission output power determination unit (transmission output power determination means)
20 Camera unit (imaging device)

Claims (5)

A simultaneous communication system mobile communication device including a drive circuit driven by a clock signal output from a drive control circuit,
A transmission / reception frequency interval determining means for determining whether a transmission / reception frequency interval matches or is close to a harmonic of the clock signal;
A transmission output power determination means for comparing the transmission output power with a preset threshold;
The frequency of the clock signal of the drive control circuit when it is determined that the transmission / reception frequency interval matches or is close to the harmonics of the clock signal and the transmission output power is greater than or equal to the threshold value A mobile communication device comprising frequency changing means for changing the frequency. A mobile communication device of a simultaneous transmission / reception system including an imaging device driven by a clock signal output from a drive control circuit,
A transmission / reception frequency interval determining means for determining whether a transmission / reception frequency interval matches or is close to a harmonic of the clock signal;
A spurious component generated by a harmonic and a transmission wave of the clock signal that coincides with or near the transmission / reception frequency interval and falls into the reception band is associated with transmission output power, and the transmission output power and a preset threshold value A transmission output power determination means for performing a comparison;
The frequency of the clock signal of the drive control circuit when it is determined that the transmission / reception frequency interval matches or is close to the harmonics of the clock signal and the transmission output power is greater than or equal to the threshold value A mobile communication device comprising frequency changing means for changing the frequency. The movement according to claim 1 or 2, wherein the clock signal changed by the frequency changing means can be changed to either the high frequency side or the low frequency side of the clock signal before the change. Communication device. The said transmission / reception frequency space | interval determination means determines whether a some transmission / reception frequency space | interval and the said clock signal correspond or are in the vicinity, The any one of Claim 1 thru | or 3 characterized by the above-mentioned. Mobile communication device. The mobile communication device according to any one of claims 1 to 3, wherein the mobile communication device is connected to a plurality of wireless communication systems having different transmission / reception frequency intervals.

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