JP2010199743A - Portable radio apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve an excellent configuration for potability while maintaining good receiving characteristics when an antenna for broadcast signal reception is not prepared in a portable terminal apparatus. <P>SOLUTION: In a portable radio apparatus which is composed preparing a cradle 2 and the portable terminal apparatus 1, the cradle 2 incorporates the antenna 22 for broadcast signal reception, and prepares a contact 21 for transmitting the received broadcast signal, and a terminal mounting portion 23 for mounting the portable terminal apparatus 1. The portable terminal apparatus 1 prepares a contact 11 which receives the broadcast signal through the contact 21 of the cradle 2, and a broadcast receiving circuit portion 14 which demodulates the received broadcast signal. Moreover, the portable terminal apparatus prepares a band switch circuit portion 12 which carries out band switching of the received broadcast signal, and outputs it to the broadcast receiving circuit portion 14, and carries out switching to a frequency tuned to a band of the receiving broadcast signal. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a portable radio apparatus that receives a broadcast signal via a broadcast signal receiving antenna provided on a portable terminal base.

  In recent years, one-segment broadcasting (one seg) has been started as a broadcasting service based on terrestrial digital television broadcasting for receiving portable terminal devices such as cellular phones and PDAs (Personal Digital Assistants). Also, practical test broadcasts such as terrestrial digital radio broadcasting (so-called 3 segments) and MediaFLO (media flow) service are being carried out. In such portable terminal devices that can receive broadcasts typified by one-segment broadcasting, a whip antenna or an antenna combined earphone cable is generally used for reception. On the other hand, when a variety of designs is required, it is desirable that the antenna is not provided outside the portable terminal device, but the antenna is built in the terminal. However, such a built-in antenna may not be able to receive well in a place where the broadcast signal reception environment is poor. In particular, it is difficult to obtain a good reception state indoors in a poor reception environment.

  Patent Document 1 discloses a portable terminal and a cradle configuration that enable satisfactory reception indoors. This apparatus has a configuration in which one end of a cable is connected to a cradle (portable terminal base) and an external antenna is installed at the other end. By placing this external antenna outdoors, it is possible to receive broadcast signals satisfactorily when used in an indoor environment.

JP 2007-295435 A

  However, the above conventional technique has a problem that the installation work becomes complicated because it is necessary to install an external antenna in a place where the broadcast signal reception state is good and to connect the external antenna and the cradle with a cable. . In addition, since the mobile terminal device is used in a cradle connected to a fixedly installed external antenna, the usage environment is limited to indoors, and portability is very low.

  On the other hand, in order to receive a broadcast signal satisfactorily only with the built-in antenna of the mobile terminal device without using an external antenna, compared to a communication antenna for transmitting and receiving information related to communication such as conventional telephones and text messages. It is necessary to incorporate a larger antenna. As described above, when the broadcast signal receiving antenna is built in, there is a problem that the portable terminal device main body is enlarged.

  The present invention has been made in view of the above problems, and even when a mobile terminal device is not provided with an antenna for receiving a broadcast signal, it is possible to maintain a good reception characteristic and realize a configuration with excellent portability. The purpose is to.

  The present invention is a portable wireless device including a cradle (portable terminal base) and a portable terminal device. The cradle has a built-in antenna for receiving a broadcast signal, and includes a contact for transmitting a broadcast signal received by the antenna and a terminal mounting portion for detachably mounting the mobile terminal device. Further, the mobile terminal device is provided with a contact that is mounted on the terminal mounting portion of the cradle and receives a broadcast signal received by the built-in antenna of the cradle through the contact of the cradle. And the broadcast receiving circuit part which demodulates the broadcast signal received via the contact was provided.

  The present invention further includes a band switching circuit unit that inputs a broadcast signal received from a contact point to the portable terminal device, performs band switching of the input broadcast signal, and outputs the band signal to the broadcast receiving circuit unit. The band switching circuit unit switches the frequency of the received broadcast signal between two states, a high frequency and a low frequency, and continuously switches the frequency of the received broadcast signal to a high state or a low state. And a continuous switching unit. Further, the combination of the two-state switching unit and the continuous switching unit switches to a frequency that matches the band of the broadcast signal to be received.

  With this configuration, it is possible to view a broadcast signal received by an antenna built in the cradle with a mobile terminal device attached to the cradle.

  According to the present invention, by using the mobile terminal device attached to the cradle, it is possible to receive well even in a place where the broadcast signal reception environment is bad such as indoors, and by incorporating the antenna in the cradle, The portability of the cradle itself is also improved. Further, since it is not necessary to incorporate the broadcast signal receiving antenna in the mobile terminal device, the mobile terminal device can be downsized.

It is a perspective view which shows the example of whole structure by one embodiment of this invention. It is a block diagram which shows the example of an internal structure by one embodiment of this invention. It is a block diagram which shows the structural example of the zone | band switching circuit part by one embodiment of this invention. It is explanatory drawing which shows the frequency characteristic example of the antenna by one embodiment of this invention. It is explanatory drawing which shows the band switching process example of the band switching circuit part by one embodiment of this invention. It is explanatory drawing which shows the band switching characteristic example of the band switching circuit part by one embodiment of this invention. It is explanatory drawing which shows the example of control signal table information by one embodiment of this invention. It is a block diagram which shows the example of an internal structure by other embodiment of this invention. It is a block diagram which shows the structural example of the band switching circuit part by other embodiment of this invention. It is explanatory drawing which shows the example of control signal table information by other embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 shows an example of the overall configuration of a portable radio apparatus representing an embodiment of the present invention. The portable wireless device according to this example includes a portable terminal device 1 and a cradle 2 which is a portable terminal base on which the portable terminal device 1 is mounted. The mobile terminal device 1 includes a contact 11 that is electrically connected to the cradle 2 when mounted on the cradle 2. In addition, an operation unit 18 having operation buttons and operation keys for a user to perform a channel selection operation for broadcasting (hereinafter, one-segment broadcasting will be described as an example of a broadcasting service), an operation such as mail and a telephone call, and the like. An image display unit 17 is provided for displaying the received one-segment image, mail, and other information.

  The cradle 2 includes a terminal mounting portion 23 for detachably mounting the mobile terminal device 1, and a contact 21 for electrically connecting the mobile terminal device 1 when the mobile terminal device 1 is mounted. . The cradle 2 includes an antenna 22 for receiving a one-segment broadcasting signal. In addition, since the antenna 22 is located inside the cradle 2, the antenna 22 is actually invisible from the outside. In addition, the contact 11 of the mobile terminal device 1 is configured to face the outside of the main body of the mobile terminal device 1. When the contact 11 is mounted on the cradle 2, the contact 11 is located at a position facing the contact 21 provided on the surface of the terminal mounting portion 23 of the cradle 2. Provide.

  In FIG. 2, the block diagram showing the internal structural example of the portable terminal device 1 and the cradle 2 is shown. The cradle 2 includes an antenna 22 therein, and the one-segment broadcasting signal received by the antenna 22 is transmitted to the mobile terminal device 1 attached to the cradle 2 via the contact 21.

  The mobile terminal device 1 includes a contact point 11, a band switching circuit unit 12, a tuner unit 13, a broadcast receiving circuit unit 14, a CPU (Central Processing Unit) 15, an information storage unit 16, an image A display unit 17 and an operation unit 18 are provided.

  The contact 11 is electrically connected to the contact 21 of the cradle 2 and receives the one-segment broadcasting signal received by the antenna 22 of the cradle 2 via the contact 21. The band switching circuit unit 12 receives the one-segment broadcasting signal received at the contact 11, switches the frequency band of the broadcasting signal based on a control command from the CPU 15, and the tuner unit 13 converts the one-segment broadcasting signal that has been band-switched. To enter. The tuner unit 13 selectively acquires a frequency signal of a channel to be viewed based on a control command from the CPU 15 and inputs the broadcast signal to the broadcast receiving circuit unit 14. The broadcast receiving circuit unit 14 demodulates the input broadcast signal, extracts signals such as video signals and audio signals, displays them on the image display unit 17 via the CPU 15, and outputs them to an audio output unit (not shown). Here, the video signal and the audio signal are extracted from the broadcast signal, but other information superimposed on the broadcast signal is similarly extracted, processed by the processing unit corresponding to each information, and output. To do.

  The CPU 15 inputs channel selection information such as the channel of the one-seg broadcasting station to be viewed, which is input from the operation unit 18 by the user, and refers to the control signal table information for each channel stored in the information storage unit 16 based on the information. Then, a control signal is output to the band switching circuit unit 12. The information storage unit 16 stores control information corresponding to the channel to be viewed in advance. The control information is information that defines how to control the band switching circuit unit 12 so that the one-segment broadcasting signal having a frequency corresponding to the channel to be viewed can be received satisfactorily. The band switching circuit unit 12 controls the band switching circuit based on the control signal input from the CPU 15 and switches the frequency of the input broadcast signal to a predetermined frequency.

  Further, the CPU 15 controls the tuner unit 13 based on the control signal table information for each channel acquired from the information storage unit 16 to adjust the tuner to the selected channel and selectively acquire a predetermined frequency. . The tuner unit 13 receives the broadcast signal after band switching from the band switching circuit unit 12, receives control from the CPU 15, and selectively acquires a broadcast signal having a frequency corresponding to a predetermined channel. The broadcast receiving circuit unit 14 receives the broadcast signal selected and acquired by the tuner unit 13 and extracts a video signal and an audio signal from the broadcast signal. The video signal and audio signal taken out by the broadcast receiving circuit unit 14 are input to the CPU 15, the video signal is displayed on the image display unit 17, and the audio signal is output to an audio output unit such as a speaker or an earphone (not shown).

  In this example, the tuner unit 13 that acquires a broadcast signal of a predetermined frequency and the broadcast reception circuit unit 14 that extracts a video signal and an audio signal from the acquired broadcast signal are configured separately according to the selected channel. However, a configuration in which these functions are realized by one processing unit may be adopted.

  In addition, the information storage unit 16 of this example stores control signal table information in a storage device such as a ROM (Read Only Memory). An example of the control signal table information stored in the information storage unit 16 is shown in FIG. 7 and will be described later.

  In this example, the connection between the portable terminal device 1 and the cradle 2 is electrically connected by the contact 11 and the contact 12, but these can be realized as physical metal contacts. The connection between the mobile terminal device 1 and the cradle 2 is not limited to this, and can be realized as an electromagnetic connection. Further, any other configuration may be used as long as it is a connection method capable of transmitting the one-segment broadcasting signal from the cradle 2 side to the mobile terminal device 1 side. Further, the position where the contact 11 and the contact 12 are provided is not limited to the position shown in FIG. 1, and may be any other position as long as the mobile terminal device 1 is mounted on the cradle 2 and can transmit and receive broadcast signals. It may be provided.

  FIG. 3 is a configuration diagram illustrating a configuration example of the band switching circuit unit 12 of the mobile terminal device 1. The band switching circuit unit 12 is divided into a high frequency signal part for switching the frequency band of the input broadcast signal and a control signal part for controlling a device for frequency switching. The high-frequency signal portion includes a PIN diode 33, a varactor diode 34, capacitors 37a and 37b for removing a direct current component, and a coil 35 for changing impedance. The control signal portion is composed of choke coils 36a, 36b, 36c for removing high-frequency signals, bypass capacitors 38a, 38b, a switch 31, a resistor 39 for controlling current, a variable resistor 32, and a control voltage unit 40.

  The one-segment broadcasting signal received by the antenna 22 of the cradle 2 is input to the band switching circuit unit 12 of the mobile terminal device 1 through a contact (not shown), and through a high-frequency signal portion that switches the frequency band of the input broadcasting signal. To the tuner unit 13. The high-frequency signal portion is a varactor that is an element having a function of a variable capacitor on the output side of the PIN diode 33 and the coil 35, in which a PIN diode 33 that is an element having a switching function and a coil 35 that varies impedance are connected in parallel. A diode 34 is connected. Then, the broadcast signal input via the contact passes through the PIN diode 33 or the coil 35, then passes through the varactor diode 34, and is output to the tuner unit 13 connected to the cathode side of the varactor diode 34. In this way, in this example, switching of the frequency band of the received one-segment broadcasting signal is realized by switching the state of the two diodes in the high-frequency signal portion.

The reason for switching the frequency band of the broadcast signal in this way will be described below.
In the present example, the one-segment broadcasting signal receiving antenna 22 is built in the cradle 2. For this reason, in order to minimize the influence received from the mobile terminal device 1 attached to the cradle 2 and the surrounding environment, a position where these influences are not received as much as possible, for example, a position far from the mobile terminal device 1 or a terminal mounting portion The antenna 22 is arranged at a part not in contact with 23. However, the VSWR characteristic (Voltage Standing Wave Ratio) representing the reception characteristics of the antenna is a narrow band, and sufficient reception characteristics cannot be obtained for all bands of one-segment broadcasting.

  FIG. 4 shows an example of the frequency characteristics of the antenna when the antenna is provided inside the cradle. The graph of FIG. 4 shows a VSWR characteristic on the vertical axis, a frequency on the horizontal axis, a graph 401 representing the frequency characteristic of the antenna 22 built in the cradle 2, and a frequency band 402 of the received one-segment broadcasting. Here, the smaller the value of the VSWR characteristic, the better the characteristic. Therefore, the range of the request level 404 or lower for receiving the broadcast signal satisfactorily is a frequency band in which good reception is possible. As shown in FIG. 4, in the frequency characteristics of the antenna 22 built in the cradle 2, the receivable range 403 becomes narrow, and good reception characteristics cannot be obtained for all bands of one-segment broadcasting. Therefore, in this example, the band switching circuit unit 12 is provided on the mobile terminal device 1 side, and the received one-segment broadcasting signal is switched to a desired frequency to overcome the problem and enable good reception.

  Next, the processing content of the band switching according to this example will be described with reference to FIGS.

  First, the first band switching process is performed by the two-state switching unit 301 that switches the frequency of the one-segment broadcasting signal between two states of a high frequency and a low frequency by turning on / off the PIN diode 33.

The two-state switching unit 301 includes a high-frequency signal part (PIN diode 33 and coil 35) that converts the frequency of the broadcast signal, and a control signal part (switch 31 and resistor 39) that controls the elements of the high-frequency signal part. The high-frequency signal part connects the PIN diode 33 and the coil 35 in parallel, and the input broadcast signal is output to the varactor diode 34 connected to the output side via the PIN diode 33 and the coil 35.
In the control signal portion, one end of the switch 31 is connected to the positive side of the control voltage unit 40 via the resistor 39, and the other end of the switch 31 is connected to the ground unit 41a. The other end of the switch 31 is connected to the broadcast signal input side of the PIN diode 33 and the coil 35.

  The two-state switching process for switching the frequency of the one-segment broadcasting signal to two states of a high frequency and a low frequency is realized by turning on / off the PIN diode 33. When a DC voltage is applied in the forward direction, the PIN diode causes a current to flow. When no DC voltage is applied, the PIN diode does not pass a current because the impedance of the PIN diode increases. This state in which current flows is called on, and the state in which no current flows is called off. Since the ON / OFF of the PIN diode 33 is controlled by the presence or absence of a DC voltage applied to the anode side, the PIN diode 33 can be switched by ON / OFF of the switch 31 in the control signal portion.

  When the switch 31 is off, the switch 31 and the resistor 39 are electrically disconnected, and the switch 31 is connected to the ground portion 41a side. At this time, since the DC voltage of the control voltage unit 40 is not applied to the PIN diode 33, the state of the PIN diode 33 is turned off. When the PIN diode is off, the impedance of the PIN diode increases and becomes high impedance. Therefore, the input one-segment broadcasting signal cannot pass through the PIN diode 33 side and flows toward the coil 35 in parallel. By passing the coil 35, the impedance can be changed and the frequency can be changed to a low state.

  On the other hand, when the switch 31 is on, the switch 31 and the resistor 39 are connected, and a DC voltage is applied to the anode side of the PIN diode 33 by the control voltage unit 40. At this time, the state of the PIN diode 33 is turned on. When the PIN diode 33 is on, the impedance of the PIN diode is reduced and the impedance is low, so that the input one-segment broadcasting signal flows on the PIN diode 33 side. In this case, since the one-segment broadcasting signal does not pass through the coil 35, it can be changed to a higher frequency than when the PIN diode 33 is off.

  FIG. 5A shows an example of two-state switching of the frequency of the one-segment broadcasting signal. The graph of FIG. 5A shows the frequency band 503 of the received one-segment broadcast signal, with the vertical axis representing the VSWR characteristic and the horizontal axis representing the frequency, similarly to the frequency characteristic shown in FIG. Here, when the switch 31 is off, the frequency characteristic of the graph 502 is obtained, and when the switch 31 is on, the frequency characteristic of the graph 501 is obtained. As described above, the frequency of the one-segment broadcasting signal can be switched between the high state and the low state by turning on / off the PIN diode 33 accompanying the on / off switching of the switch 31.

  Next, in the second band switching process, the frequency of the one-segment broadcasting signal is continuously switched to a high frequency or a low frequency by changing the capacitance of the varactor diode 34 that is an element having a function of a variable capacitor. This is performed by the continuous switching unit 302.

The continuous switching unit 302 includes a high-frequency signal portion (varactor diode 34) that converts the frequency of the broadcast signal and a control signal portion (variable resistor 32) that controls elements of the high-frequency signal portion. The high-frequency signal portion connects the varactor diode 34 to the PIN diode 33 and the output side of the coil 35 of the two-state switching unit 301, and connects the cathode side of the varactor diode 34 to the tuner unit 13. The broadcast signal input from the PIN diode 33 or the coil 35 is output via the varactor diode 34 to the tuner unit 13 connected to the cathode side of the varactor diode 34.
In the control signal portion, one end of the variable resistor 32 is connected to the positive side of the control voltage unit 40, and the other end of the variable resistor 32 is connected to the cathode side of the varactor diode 34.

  Regardless of whether the switch 31 is on or off, a DC voltage is always applied to the varactor diode 34 by the control voltage unit 40. Further, the DC voltage applied to the cathode side of the varactor diode 34 can be controlled by changing the variable resistor 32. The varactor diode 34 can be used as a variable capacitor utilizing a change in capacitance due to a change in the thickness of the depletion layer of the PN junction of the diode due to a DC voltage applied in the reverse direction. Therefore, the impedance can be continuously changed with the change of the electrostatic capacity by continuously changing the DC voltage, and as a result, the frequency of the inputted one-segment broadcasting signal can be continuously changed. it can.

  FIG. 5B shows an example of continuous switching of the frequency of the one-segment broadcasting signal. The graph of FIG. 5B shows the frequency band 505 of the received one-segment broadcasting, with the vertical axis indicating the VSWR characteristic and the horizontal axis indicating the frequency, similarly to the frequency characteristic shown in FIG. Here, by the voltage control by changing the variable resistor 32, the frequency characteristic of the graph 504 can be continuously changed to a high state or a low state as indicated by an arrow 506.

  In this example, by switching the frequency by combining the two-state switching process and the continuous switching process described above, good reception characteristics can be obtained for all frequency bands of one-segment broadcasting.

  FIG. 6 is a graph showing an example of the band switching characteristics of the band switching circuit unit 12 according to this example. In FIG. 6, the vertical axis represents the VSWR characteristic, the horizontal axis represents the frequency, and the frequency band 603 of the received one-segment broadcasting is illustrated. In the band switching process according to this example, switching is made between two states of a high frequency state 601 and a low state 602 represented by a solid line in FIG. 6 by turning on / off the PIN diode 33 accompanying the on / off switching control of the switch 31. Furthermore, by changing the capacitance of the varactor diode 34 accompanying voltage control for changing the variable resistor 32, the frequency can be continuously switched as shown by a graph 604 shown by a dotted line in FIG. As described above, according to the band switching process according to the present example, it is possible to satisfactorily receive broadcast signals in the entire one-segment frequency band.

  As a device constituting the control signal portion of this example, specifically, the switch 31 can be realized by GPIO (General Purpose Input / Output) and the variable resistor 32 can be realized by PWM (Pulse Width Modulation). In the information storage unit 16, an analog voltage (PWM output) for controlling the varactor diode for each channel and a digital signal for controlling the PIN diode (PWM output) in order to match the characteristics of the band switching circuit unit 12 to the frequency corresponding to each channel of the one segment. GPIO H / L or 1/0) control signal data is defined in advance as a table.

  FIG. 7 shows an example of the control signal table information stored in the information storage unit 16. In the control signal table information, a channel 701, a PWM output 702, and a GPIO output 703 are defined, and a PWM output value for obtaining a frequency characteristic corresponding to the selected channel and an output signal (H / L) of GPIO. Define it. The illustrated values are examples shown for convenience, and are actually defined as values corresponding to the frequency of the target one-segment broadcasting signal. In actual operation, the user selects a desired channel by operating the operation unit 18 of the mobile terminal device 1, and the selected channel information is input to the CPU 15. The CPU 15 refers to the information storage unit 16, acquires the PWM output value corresponding to the selected channel and the output signal of GPIO, and outputs a control signal to the band switching circuit unit 12 based on the information. The band switching circuit unit 12 can control the PWM output and GPIO based on a control signal from the CPU 15 to obtain a desired frequency characteristic.

  Although the switching of the frequency band of the one-segment broadcasting signal in the band switching circuit unit 12 of this example has been described as being realized by the combination of the PIN diode 33 and the varactor diode 34, other diodes or MEMS (Micro Electro Mechanical Systems) ) A similar frequency switching function can be realized by using an element such as a variable capacitance element. For example, the frequency band may be switched by combining two varactor diodes. Further, instead of the PIN diode, an element having a switching function such as a field effect transistor (FET) or a MEMS may be used. In the band switching circuit unit 12 of this example, a switch and a variable resistor are used for the control signal portion for controlling the diode. For example, the switch is configured by using GPIO and the variable resistor by using PWM. Explained. Also about this, it can also comprise using the other apparatus with the same function.

  As another embodiment of the present invention, when a portable terminal device has a built-in antenna for receiving broadcast signals and the portable terminal device is not attached to a cradle, the band switching circuit unit receives the broadcast signal received from the antenna in the portable terminal device. It is good also as a structure which provides the signal switching part used as the input to 12.

  FIG. 8 and FIG. 9 show an internal configuration example and a band switching circuit unit configuration example of a portable radio apparatus representing another embodiment of the present invention. In FIGS. 8 and 9, the same components as those in FIGS. 2 and 3 are denoted by the same reference numerals, and description thereof is omitted. In FIG. 8, the mobile terminal device 1 includes an antenna 19 for receiving a one-segment broadcasting signal. In addition, a signal switching unit 20 is provided between the band switching circuit unit 12 and the contact point 11 so that a signal from the antenna 19 is input to the signal switching unit 20. The signal switching unit 20 switches between the one-seg broadcast signal received by the antenna of the cradle 2 input via the contact 11 and the one-seg broadcast signal received by the antenna 19. The broadcast signal switching by the signal switching unit 20 may be performed by switching the signal input destination when the user performs a specific operation from the operation unit 18 of the mobile terminal device 1. In addition, it is detected whether or not the mobile terminal device 1 is mounted on the cradle 2. If the mobile terminal device 1 is mounted on the cradle 2, it is connected to the contact 11 side. A broadcast signal may be input from the connected side.

  In this example, the control signal corresponding to the channel to be viewed differs between when the broadcast signal is received by the antenna 22 of the cradle 2 and when it is received by the antenna 19 of the mobile terminal device 1. For this reason, two types of control signal table information are also stored in advance in the control signal table information stored in the information storage unit 16a. FIG. 10 shows an example of the control signal table information stored in the information storage unit 16a according to this example. In the control signal table information of FIG. 10, the PWM output and GPIO output value 101 when the broadcast signal received by the antenna 22 of the cradle 2 is used, and the broadcast signal received by the antenna 19 of the mobile terminal device 1 are used. A PWM output and a GPIO output value 102 are defined in advance.

  When viewing 1Seg, the CPU 15 determines which antenna the signal switching unit 20 is connected to, and refers to the control signal table for each channel stored in the information storage unit 16a. Get control information corresponding to the current antenna. Based on the information, a control signal is output to the band switching circuit unit 12. The band switching circuit unit 12 controls the band switching circuit based on the control signal input from the CPU 15 and switches the frequency of the input broadcast signal to a predetermined frequency.

  With this configuration, when the mobile terminal device is mounted on the cradle, the broadcast signal is well received, and even when the mobile terminal device is used alone without being mounted on the cradle, the broadcast signal can be transmitted. It can be received well.

  Note that the cradle according to the present example may be provided with a charging function of the mobile terminal device in addition to the reception of the one-segment broadcasting signal by the built-in antenna. In addition, the portable terminal device can be configured to have a function of connecting a peripheral device to the portable terminal device by providing a USB port or the like, attaching the portable terminal device, and connecting the peripheral device or the like to the USB port.

  DESCRIPTION OF SYMBOLS 1 ... Portable terminal device, 2 ... Cradle, 11 ... Contact, 12 ... Band switching circuit part, 13 ... Tuner part, 14 ... Broadcast receiving circuit part, 15 ... CPU, 16 ... Information storage part, 17 ... Image display part, 18 DESCRIPTION OF SYMBOLS ... Operation part, 19 ... Antenna, 20 ... Signal switching part, 21 ... Contact, 22 ... Antenna, 23 ... Terminal mounting base, 31 ... Switch, 32 ... Variable resistor, 33 ... PIN diode, 34 ... Varactor diode, 35 ... Coil, 36a, 36b, 36c ... Choke coil, 37a, 37b ... Capacitor, 38a, 38b ... Bypass capacitor, 39 ... Resistor, 40 ... Control voltage part, 41a, 41b, 41c, 41d, 41e, 41f ... Grounding part, 301 ... Two-state switching unit, 302 ... Continuous switching unit

Claims (7)

A cradle having a built-in antenna for receiving a broadcast signal, a contact for transmitting a broadcast signal received by the antenna, and a terminal mounting unit for detachably mounting the mobile terminal device;
A contact that is mounted on a terminal mounting portion of the cradle and receives a broadcast signal received by the antenna of the cradle via a contact of the cradle;
A broadcast receiving circuit for demodulating a broadcast signal received via the contact;
A mobile terminal device comprising:
A portable wireless device configured to include: The portable wireless device according to claim 1, wherein
A portable radio apparatus comprising: a band switching circuit unit that inputs a broadcast signal received from the contact point to the portable terminal device, performs band switching of the input broadcast signal, and outputs the band signal to the broadcast receiving circuit unit. The portable wireless device according to claim 2, wherein
The band switching circuit unit of the mobile terminal device is
A two-state switching unit that switches a frequency of the received broadcast signal between two states of a high frequency and a low frequency;
A continuous switching unit that continuously switches the frequency of the received broadcast signal to a high state or a low state;
A portable radio apparatus that performs switching to a frequency that matches a band of a broadcast signal to be received by a combination of the two-state switching unit and the continuous switching unit. The portable wireless device according to claim 3, wherein
The two-state switching unit of the band switching circuit unit of the portable terminal device is configured by connecting an element having a switching function and a coil in parallel.
Portable wireless device. The portable wireless device according to claim 3, wherein
The continuous switching unit of the band switching circuit unit of the mobile terminal device is configured with a variable capacitance element.
Portable wireless device. In the said portable terminal device of the portable radio | wireless apparatus of Claim 2 or Claim 3,
An operation unit that allows a user to perform a tuning operation of a received broadcast;
A control information storage unit that defines a control state of the band switching circuit unit for receiving the frequency of the selected broadcast signal satisfactorily;
The band switching circuit unit is a portable radio apparatus that performs band switching by inputting control information acquired from the control information storage unit based on channel selection information from the operation unit. The portable terminal device includes a broadcast signal receiving antenna,
When the mobile terminal device is not attached to the cradle, a broadcast signal received by a broadcast signal receiving antenna provided in the mobile terminal device is used as an input to the band switching circuit unit, and the mobile terminal device is connected to the cradle. The broadcast signal switching part which makes the input to the said band switching circuit part the broadcast signal received with the antenna for broadcast signal reception built in the said cradle when equipped is provided. The portable wireless device described.

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