JP2007259199A - Mobile communication terminal device, antenna switching control program, program storage device, antenna switching controlling section and antenna switching control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mobile communication terminal device which has stable high camera performance by suppressing influence of a transmission signal during communication exerted on photographing operation of a camera. <P>SOLUTION: The mobile communication terminal device is equipped with: a plurality of antennas each independently connectable to a radio circuit; a switching circuit which selects one of the plurality of antennas and connects it to the radio circuit; and the camera for imaging an image, wherein the mobile communication terminal device is equipped with a means for making an antenna to be selected in the camera operation during communication correspond to transmission power and presetting and storing it, and a control means for switching to the preset antenna and connecting it to the radio circuit in the camera operation during communication, so that during communication, in accordance with the transmission power, control is performed so as to correspondingly switching an antenna with which the degree of influence upon photographic data of the camera becomes low. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a mobile communication terminal apparatus including a plurality of antennas and a camera, and a switching control method for the plurality of antennas.

  With the recent development of mobile communications, the functionality of mobile terminal devices is increasing. In particular, there is a built-in camera that converts images into electrical signals using semiconductor elements that react to light, such as CCD (Charge Coupled Devices) and CMOS (Complementary Metal Oxide Semiconductor), and stores them as digital data in storage media such as flash memory. It has become common (see, for example, Patent Document 1). On the other hand, the communication functions include not only voice communication but also data communication such as browsing and mail, transmission / reception of digital image data captured from the camera, videophone function, and the like. In order to realize always good radio performance, a mobile communication terminal is provided with a plurality of antennas, and a function of appropriately performing switching control has also become common (see, for example, Patent Document 2).

  FIG. 5 is a diagram illustrating a basic configuration of a mobile communication terminal apparatus including a plurality of antennas and cameras. In FIG. 5, 101 is a first antenna, 102 is a second antenna, 103 is a first antenna 101, an antenna switching circuit for selecting and switching one of the second antennas 102, 104 is a high frequency for transmission and reception at different frequencies A duplexer for combining paths, 105 is a transmission circuit, 106 is a reception circuit, 108 is a camera, 501 is a CPU (Central Processing Unit) that performs processing of data to be transmitted and received and operations for controlling each component, 502 is A ROM (Read Only Memory) in which a program necessary for the calculation of the CPU 501 is stored, a reference numeral 503 is a RAM (Random Access Memory) in which data such as data necessary for the calculation of the CPU 501 is appropriately stored, and 112 is an interface. In FIG. 5, the high-frequency signals of the transmission circuit and the reception circuit are separated and combined by a duplexer. However, in a mobile communication terminal device corresponding to a wireless communication system in which the radio access method is TDMA (Time Division Multiple Access), Some are configured to be selectively switched by a switch.

The received power of the receiving circuit in the mobile communication terminal configured as described above constantly changes depending on the physical conditions such as the distance from the base station and the presence or absence of obstacles, especially the radio wave propagation characteristics such as fading when moving. ing. In particular, at a relatively high frequency used for mobile communication, a large difference is seen in the received power only by the antenna position being different by several millimeters to several centimeters. Furthermore, as shown in FIG. 6, the form in which the user holds the mobile communication terminal device is different depending on various communication forms such as voice communication, browsing, mail, and videophone, so that the mobile communication terminal is provided. Due to the physical positional relationship and the influence of the human body proximity, the performance of each antenna is superior or inferior. Furthermore, a plurality of antennas provided in a mobile communication terminal include a helical antenna and a whip antenna that protrude from the casing, a plate antenna, a rod antenna and a chip antenna that are disposed inside the casing, and the casing itself. Various types of antennas are used, such as a housing antenna that looks like an antenna. Under such circumstances, control is generally performed so as to appropriately select and switch an antenna that can obtain high received signal power from among a plurality of antennas.
Japanese Patent Laying-Open No. 2003-152847 (page 16, FIG. 2) JP 2003-78473 A (page 8, FIG. 1)

  However, in such a conventional mobile communication terminal device, when an antenna is selected based on only the received signal power during communication, the selected antenna is placed in close proximity to the camera body or the processing circuit for data and data storage circuit. In this case, there is a problem that a transmission signal radiated from an antenna is affected by jumping into a camera or the like, and noise is generated in photographing data. In particular, an antenna that looks like the case of the mobile communication terminal device itself can obtain a relatively high antenna gain, but has a large mutual interference with the contents of the case such as a camera, which affects the internal circuit during transmission. There was a problem of causing it.

  The present invention has been made in view of the above-described conventional circumstances. During the operation of the camera, a transmission signal during communication converts an image into an electrical signal and stores it as digital data in a storage medium. The mobile communication terminal device and the antenna switching method are provided that can select and switch the optimum antenna in consideration of the influence on the imaging process.

  The mobile communication terminal apparatus according to claim 1 of the present invention selects a plurality of antennas, each of which can be independently connected to a radio circuit, and selects one of the plurality of antennas to connect to the radio circuit. In a mobile communication terminal device comprising a switching circuit and a camera for taking an image, means for presetting and storing an antenna to be selected during operation of the camera during communication in association with a transmission power, and communication It is configured to include a control means for switching to the preset antenna during the camera operation and connecting to the radio circuit. With this configuration, by associating the antenna, which has a low influence on the captured data of the camera, so that it is selected during camera operation according to the transmission power, it is possible to prevent performance degradation such as camera image quality degradation during a call and It is also possible to provide an excellent mobile communication terminal device that realizes stable camera performance.

  The mobile communication terminal apparatus according to claim 2 of the present invention selects a plurality of antennas, each of which can be independently connected to a radio circuit, and selects one of the plurality of antennas to connect to the radio circuit. In a mobile communication terminal device comprising a switching circuit, a camera for capturing an image, and a microprocessor that performs overall control of an internal circuit, the microprocessor is an antenna to be selected during operation of the camera during communication Is stored in association with transmission power, and is provided with a removal means for switching to the antenna set in advance during operation of the camera during communication and connecting to the radio circuit. . With this configuration, it is possible to prevent performance degradation such as camera image quality degradation during a call by attaching to the store so that the antenna that has a low influence on the shooting data of the camera is selected during camera operation according to the transmission power. Therefore, it is possible to provide an excellent mobile communication terminal device that realizes stable camera performance even during communication.

  The mobile communication terminal apparatus according to claim 3 of the present invention selects a plurality of antennas, each of which can be independently connected to a radio circuit, and selects one of the plurality of antennas to connect to the radio circuit. In a mobile communication terminal device comprising a switching circuit, a camera for capturing an image, and a microprocessor that performs overall control of an internal circuit, the microprocessor is an antenna to be selected during operation of the camera during communication Is stored in advance in association with the transmission power, and the microprocessor is caused to function so as to control the connection to the radio circuit by switching to the preset antenna during operation of the camera during communication. Is provided with a program storage unit. With this configuration, by associating the antenna, which has a low influence on the captured data of the camera, so that it is selected during camera operation according to the transmission power, it is possible to prevent performance degradation such as camera image quality degradation during a call and It is also possible to provide an excellent mobile communication terminal device that realizes stable camera performance.

  According to a fourth aspect of the present invention, there is provided an antenna switching control program that selects a plurality of antennas, each of which can be independently connected to a radio circuit, and selects one of the plurality of antennas to connect to the radio circuit. In a mobile communication terminal device comprising a switching circuit, a camera for capturing an image, and a microprocessor that performs overall control of an internal circuit, the microprocessor is an antenna to be selected during operation of the camera during communication Is configured to function as control means for switching to the preset antenna when operating the camera during communication and connecting to a radio circuit. Yes. With this configuration, by associating the antenna that has a low influence on the shooting data of the camera according to the transmission power so that it can be selected during camera operation, performance deterioration such as camera image quality deterioration during a call can be prevented and communication can be performed. It is possible to provide an excellent mobile communication terminal device that realizes stable camera performance sometimes.

  According to a fifth aspect of the present invention, there is provided a program storage device comprising: a plurality of antennas each of which can be independently connected to a radio circuit; and switching for selecting one of the plurality of antennas to connect to the radio circuit. In a mobile communication terminal device comprising a circuit, a camera for capturing an image, and a microprocessor that performs overall control of an internal circuit, the microprocessor selects an antenna to be selected during operation of the camera during communication , Antenna switching control for functioning as means for presetting and storing in association with the transmission power, control means for switching to the preset antenna during operation of the camera during communication, and connecting to the radio circuit The program is stored. With this configuration, by associating the antenna that has a low influence on the shooting data of the camera according to the transmission power so that it can be selected during camera operation, performance deterioration such as camera image quality deterioration during a call can be prevented and communication can be performed. It is possible to provide an excellent mobile communication terminal device that achieves stable camera performance even at times.

  The antenna switching control unit according to claim 6 of the present invention selects a plurality of antennas, each of which can be independently connected to a radio circuit, and selects one of the plurality of antennas to connect to the radio circuit. In an antenna switching control unit of a mobile communication terminal device including a switching circuit and a camera for capturing an image, an antenna to be selected during operation of the camera during communication is set in advance in association with transmission power and stored. And a control means for controlling the switching circuit to switch to the preset antenna during the operation of the camera during communication and connecting to the wireless circuit. With this configuration, by associating the antenna, which has a low influence on the captured data of the camera, so that it is selected during camera operation according to the transmission power, it is possible to prevent performance degradation such as camera image quality degradation during a call and It is also possible to provide an excellent mobile communication terminal device that realizes stable camera performance.

  In the antenna switching control method according to claim 7 of the present invention, a plurality of antennas, each of which can be independently connected to a radio circuit, and one of the plurality of antennas is selected and connected to the radio circuit. In the antenna switching method of a mobile communication terminal device comprising a switching circuit, a camera for capturing an image, and a microprocessor for controlling the switching circuit and the camera, the microprocessor detects the operation of the camera. And, when the microprocessor detects that the camera is operating during communication, controlling the switching circuit to connect a predetermined antenna corresponding to each transmission power and the radio circuit And having a configuration comprising: With this configuration, it is possible to prevent performance degradation such as camera image quality degradation during a call by associating the antenna that has a low influence on the camera award data according to the transmission power so that it is selected during camera operation. It is possible to provide an excellent mobile communication terminal device that realizes stable camera performance even during communication.

  According to the mobile communication terminal device, the antenna switching control program, the program storage device, the antenna switching control unit, and the antenna switching control method of the present invention, it is stable by suppressing the influence of the transmission signal during communication on the shooting operation of the camera. High camera performance can be obtained.

  In addition, according to the mobile communication terminal device, antenna switching control program, program storage device, antenna switching control unit, and antenna switching method of the present invention, one of the plurality of antennas has a very high gain while affecting the camera. If a large antenna is used (for example, the case of the mobile communication terminal device itself as a dipole antenna), the antenna with the high gain is used when the transmission power is low even when the camera is not operating or the camera is operating. By using and performing control so that other antennas are complementarily used according to the transmission power during camera operation, it is possible to obtain a comprehensive call performance.

  Hereinafter, first and second embodiments of the present invention will be described in detail with reference to the accompanying drawings.

(Embodiment 1)
First, with reference to FIG. 1 thru | or FIG. 3, the mobile communication terminal device, antenna switching part, and antenna switching control method in 1st Embodiment of this invention are demonstrated.

  FIG. 1 is a block diagram showing a configuration example of a mobile communication terminal apparatus according to the first embodiment of the present invention.

  In FIG. 1, 101 is a first antenna, 102 is a second antenna, 103 is a first antenna 101, an antenna switching circuit for selecting and switching one of the second antennas 102, 104 is a high frequency for transmission and reception at different frequencies Duplexer for combining paths, 105 is a transmission circuit, 106 is a reception circuit, 107 is a transmission / reception control unit for controlling the transmission circuit 105 and the reception circuit 106, 108 is a camera, 109 is a camera operation for controlling the operation of the camera 108 A control unit 110 is a storage unit that presets and stores an antenna to be selected when the camera 108 is operating, and 111 is configured to read information stored in the storage unit 110 when the camera is operating, and switch to an antenna associated with the camera during operation. The antenna switching control unit 112 that controls the antenna switching circuit 103 as shown in FIG. An interface to pass signals between the formed part. In this case, the transmission circuit 105 and the reception circuit 106 are separated and combined by the duplexer 104. However, when the radio access system of the corresponding mobile communication system is the TDMA system, the path is selectively switched by a high frequency switch. You may comprise. Here, the control units of the respective components are individually arranged. However, a single controller may be configured to have all functions.

  FIG. 2 is a diagram illustrating antennas to be selected that are stored in the storage unit 110 in association with camera operation states, standby and communication states of calls, and transmission power during communication.

  FIG. 3 is a diagram illustrating an example of antenna switching control based on an applied voltage.

  Hereinafter, a mobile communication terminal device, an antenna switching control unit, and an antenna switching control method according to the first embodiment of the present invention will be described with reference to FIGS. The received signal power arriving at the first antenna 101 and the second antenna 102 of the mobile communication terminal apparatus is a physical condition such as the distance from the base station and the presence / absence of an obstacle, in particular, radio wave propagation such as fading when moving. It is constantly changing independently depending on the characteristics. Further, depending on the state worn and held by the user and how it is placed, the performance of one of the first antenna 101 and the second antenna 102 may deteriorate due to the influence of a human body or an object nearby. For this reason, it is common to perform antenna switching control that selectively switches between the first antenna 101 and the second antenna 102 so that a good received signal can always be obtained. In the first embodiment of the present invention, the antenna switching control unit 111 can always recognize whether or not the camera 108 is operating by monitoring a signal that the camera operation control unit 109 controls the operation of the camera 108. To. First, when the camera 108 is in operation during standby, the antenna associated with the camera 108 during standby is determined from the correspondence table shown in FIG. And the second antenna 102, the information indicating that the received signal power is high is read out, the first antenna 101 and the second antenna 102 are sequentially switched, and the received signal power when each of them is connected is transmitted and received. Recognize via 107. From this result, control is performed so that the antenna is switched to be fixed to the antenna that can obtain larger received signal power. That is, the same operation as when the camera 108 is not operating is performed. When the camera 108 is in operation during a call such as a videophone call, the transmission / reception control unit 107 first monitors the signal for controlling the transmission circuit 105 to recognize the current transmission power. Here, when the current transmission power is, for example, −30 dBm, the correspondence is shown in the correspondence table shown in FIG. 2 stored in the storage unit 110 while the camera 108 is operating at the time of a call and transmission power of −30 dBm. The information that the received antenna is an antenna that can obtain a high received signal power out of the first antenna 101 and the second antenna 102 is read out, and the same control as in standby is performed. In other words, even if the camera operation and the communication condition overlap, depending on the transmission power, the same operation as when the camera is not operating or when waiting is performed. On the other hand, if the current transmission power is +20 dBm, for example, the correspondence table shown in FIG. 2 stored in the storage unit 110 shows the antenna associated during the call 108 and the operation of the camera 108 when the transmission power is +20 dBm. Information indicating that the antenna is the second antenna 102 is read out, and control is performed so that the antenna is immediately switched to the second antenna 102. Here, from the result of examining the transmission power that affects the shooting data of the camera 8 in advance, when the transmission power is low enough that there is no influence, high reception power is obtained from the first antenna 101 and the second antenna 102. When the transmission power is high enough to have an influence, the second antenna 102 is associated. In this way, when the transmission power is higher than a certain value, control is performed so that the antenna is immediately switched to the associated antenna regardless of the magnitude of the received signal power.

  As a specific example of the antenna switching control, when the antenna switching circuit 103 switches the contact point according to the voltage applied as shown in FIG. 3, when switching to the first antenna, 0V is applied, When switching to the antenna, 3 V is applied.

  In general, circuit elements such as a camera body, a processing circuit for photographing data, and a data memory occupy a relatively large volume in a small mobile communication terminal device. In addition, the transmission signal radiated from the transmission circuit 105 via the antenna has a relatively high power, and this transmission signal may jump into other electric circuits and generate unintended noise. Such a problem appears remarkably when the camera unit is close to the antenna, and noise is generated in the process of capturing the captured data from the camera and performing the processing, thereby causing disturbance in the displayed image. In particular, when a plurality of antennas are arranged in a mobile communication terminal, it is difficult to arrange all antennas in a state where no noise is generated. That is, there are antennas that easily generate noise and antennas that do not easily generate noise depending on the physical positional relationship with the camera body and its peripheral circuits. In such a situation, when the antenna switching control is performed by reflecting only the received signal power during the camera operation during a call, an antenna that is likely to generate noise is selected and noise is generated in the shooting data of the camera. Alternatively, there is a possibility that large disturbance occurs in the stored image data. In the second embodiment of the present invention, when the camera is operating during a call such as a videophone, the antenna selection control method is changed according to the transmission power, and the transmission power is high enough to affect the shooting data of the camera. Since the control to switch to the antenna having the smallest influence is performed, it is possible to prevent performance degradation such as camera image quality degradation during a call.

  In the first embodiment, the configuration of the antenna is described as two antennas, the first antenna 101 and the second antenna 102. However, this embodiment does not limit the number of antennas. For example, even when the number of antennas is further increased to the third antenna and the fourth antenna, an antenna that minimizes the deterioration in camera image quality due to noise applied to the shooting data is checked in advance and stored in association with the antenna during camera operation during a call. The same effect can be obtained by setting the unit 110. In this case, the antenna switching circuit 103 is changed to one having the number of contacts increased by the number of antennas, and a specific control method can be dealt with by increasing the number of control signals to match the number of contacts. Is possible.

(Embodiment 2)
Next, a mobile communication terminal device, an antenna switching control program, and a program storage device according to the second embodiment of the present invention will be described with reference to FIG.

  FIG. 4 is a block diagram showing a configuration example of the mobile communication terminal apparatus in the second embodiment of the present invention. 4, the same parts as those in FIG. 1 are denoted by the same reference numerals as those in FIG. 1, their descriptions are omitted, and different parts are mainly described. 4 is different from FIG. 1 in that the storage unit 110 is deleted and the antenna switching control unit 111 is replaced with a microprocessor 401 and a program storage unit 402. In the program storage unit, an antenna to be selected during operation of the camera during communication with the microprocessor 501 is stored in advance in association with transmission power, and the antenna set in advance during operation of the camera during communication is stored in the program storage unit. A program for switching and functioning as a control means connected to the radio circuit is stored.

  Hereinafter, a mobile communication terminal device, an antenna switching control program, and a program storage device according to a second embodiment of the present invention will be described with reference to FIG. First, the program stored in the program storage unit 402 allows the microprocessor 501 to always recognize whether the camera 108 is operating by monitoring a signal that the camera operation control unit 109 controls the operation of the camera 108. To work. As a result, when the camera 108 is not operating, the first antenna 101 and the second antenna 102 are sequentially switched, and the received signal power when the respective antennas are connected is recognized via the transmission / reception control unit 107. It is controlled to switch and fix to the antenna from which signal power is obtained. Further, when the camera is operating during communication such as a videophone, the microprocessor 501 is operated so that the transmission / reception control unit 107 can monitor the transmission power of the transmission circuit 105 and can always recognize the transmission power. Here, when the current transmission power is, for example, −30 dBm, the first antenna 101 and the second antenna 102 are sequentially switched, and the reception signal power when each is connected is recognized via the transmission / reception control unit 107, From this result, control is performed so that the antenna is switched to and fixed to the antenna that can obtain larger received signal power. That is, even if the camera operation and the communication condition overlap, depending on the transmission power, the same operation as when the camera is not operating or when waiting is performed. Further, for example, when the transmission power is 20 dBm, control is performed to immediately switch to the second antenna 102 associated in advance. In this way, during the camera operation during a call, the antenna control method is changed in association with each transmission power. Here, from the result of examining the transmission power that affects the captured data of the camera 8 in advance, when the transmission power is low enough to have no effect, the higher reception power of the first antenna 101 and the second antenna 102 is obtained. The antenna to be obtained is selected, and when the transmission power is high enough to have an influence, the second antenna 102 is selected from the result of examining the antenna that has the smallest influence on the shooting data of the camera 8. . Thus, when the transmission power is higher than a certain value, control is performed so that the antenna is immediately switched to the associated antenna regardless of the magnitude of the received signal power.

  Here, the transmission / reception control unit 107 and the camera control unit 109 are configured separately from the microprocessor 501, but these functions may be provided to the microprocessor 501 by a program. In the second embodiment of the present invention, the antenna to be selected at the time of camera operation during communication with the microprocessor is preset and stored in association with the transmission power, and is set at the time of camera operation during communication. By switching to the antenna and functioning as a control means connected to the radio circuit, when the transmission power is high enough to affect the camera's shooting data, control is performed to switch to the antenna that has the least influence. Therefore, it is possible to prevent performance degradation such as camera image quality degradation during a call. Further, by adopting such a configuration, it is possible to coexist with other control functions in one microprocessor, and it can be configured more compactly and inexpensively.

  INDUSTRIAL APPLICABILITY The present invention has an effect of suppressing performance degradation due to interference between a camera function and a communication function and realizing stable high performance, and is useful for mobile communication terminal devices such as mobile phones.

The figure which shows the structure of the Example of the mobile communication terminal device in 1st Embodiment of this invention. The figure which shows the antenna control method matched with each transmission power at the time of a camera operation state, each communication state, and telephone call in 2nd Embodiment of this invention. The figure which shows an example of the antenna switching control by the applied voltage in 1st Embodiment of this invention The figure which shows the structure of the Example of the mobile communication terminal device in 2nd Embodiment of this invention. The figure which shows the structure of an example of the conventional mobile communication terminal device The figure which shows the difference in the form which hold | maintains the mobile terminal device by a communication form

Explanation of symbols

Reference Signs List 101 first antenna 102 second antenna 103 antenna switching circuit 104 duplexer 105 transmission circuit 106 reception circuit 107 transmission / reception control unit 108 camera 109 camera operation control unit 110 storage unit 111 antenna switching control unit 112 interface 401 microprocessor 402 program storage unit 403 antenna Switching control unit 501 CPU
502 ROM
503 RAM

Claims (7)

A movement comprising a plurality of antennas, each of which can be independently connected to a radio circuit, a switching circuit for selecting one of the plurality of antennas to connect to the radio circuit, and a camera for taking an image In the communication terminal device, the antenna to be selected during the camera operation during communication is preset and stored in association with the transmission power, and the antenna is switched to the preset antenna during the camera operation during communication. A mobile communication terminal apparatus comprising control means for connecting to the radio circuit. A plurality of antennas, each of which can be independently connected to a radio circuit, a switching circuit for selecting one of the plurality of antennas to connect to the radio circuit, a camera for taking an image, and an internal circuit And a microprocessor that performs overall control of the antenna, the microprocessor sets and stores in advance an antenna to be selected during operation of the camera during communication in association with a transmission power A mobile communication terminal device comprising control means for switching to the preset antenna during operation of the camera during communication and connecting to the radio circuit. A plurality of antennas, each of which can be independently connected to a radio circuit, a switching circuit for selecting one of the plurality of antennas to connect to the radio circuit, a camera for taking an image, and an internal circuit In a mobile communication terminal device comprising a microprocessor that performs overall control of the above, the microprocessor sets and stores in advance an antenna to be selected during operation of the camera during communication in association with transmission power, Mobile communication comprising a program storage unit for storing a program for causing the microprocessor to function so as to switch to the preset antenna during operation of the camera during communication and connect to the wireless circuit Terminal device. A plurality of antennas, each of which can be independently connected to a radio circuit, a switching circuit for selecting one of the plurality of antennas to connect to the radio circuit, a camera for taking an image, and an internal circuit Means for pre-setting and storing an antenna to be selected during operation of the camera during communication in association with transmission power in a mobile communication terminal device comprising: a microprocessor that performs overall control of An antenna switching control program for functioning as a control means for switching to the preset antenna and connecting to a radio circuit during operation of the camera during communication. A plurality of antennas, each of which can be independently connected to a radio circuit, a switching circuit for selecting one of the plurality of antennas to connect to the radio circuit, a camera for taking an image, and an internal circuit Means for pre-setting and storing an antenna to be selected during operation of the camera during communication in association with transmission power in a mobile communication terminal device comprising: a microprocessor that performs overall control of A program storage device for storing an antenna switching control program for switching to the preset antenna when operating the camera during communication and functioning as a control unit connected to the radio circuit. A movement comprising a plurality of antennas, each of which can be independently connected to a radio circuit, a switching circuit for selecting one of the plurality of antennas to connect to the radio circuit, and a camera for taking an image In the antenna switching control unit of the communication terminal apparatus, means for presetting and storing an antenna to be selected during operation of the camera during communication in association with a transmission power, and the switching circuit during operation of the camera during communication Control means for controlling and switching to the preset antenna and connecting to the radio circuit. A plurality of antennas, each of which can be independently connected to a radio circuit, a switching circuit for selecting one of the plurality of antennas to connect to the radio circuit, a camera for capturing an image, and the switching A method of switching an antenna of a mobile communication terminal device comprising: a circuit; and a microprocessor for controlling the camera, wherein the microprocessor detects an operation of the camera, and the camera operates while the microprocessor is communicating. An antenna switching method, comprising: controlling the switching circuit to connect a predetermined antenna in association with each transmission power and the radio circuit when it is detected.

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