JP3197446B2 - Mobile terminal - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal used for voice and data communication, and more particularly to a mobile terminal not geographically fixed.

[0002]

2. Description of the Related Art In the field of mobile communications, the mobile communication system of the analog type typified by the large-capacity mobile telephone system in Japan and the AMPS system in the United States, and more recently PD
Digital mobile communication systems such as C, GSM, US-TDMA, and PHS have been developed and put into practical use, and a wide variety of services are provided throughout the world. On the other hand, related technical fields such as a personal ID for ensuring security and an IC card for use as a personal database have been developed.

Conventionally, there has been a mobile terminal device used for mobile communication as shown in FIG. FIG. 7 is a configuration diagram showing the configuration of a conventional mobile terminal device. In FIG. 7, 1 is an antenna, 2 is a modulation / demodulation unit that modulates and demodulates transmission / reception signals, 3 is a demodulation signal, 4 is a modulation signal, 5 is a baseband processing unit that processes transmission / reception data in a baseband band, and 6 is reception. Data or received voice, 7 is transmitted data or transmitted voice, 8 is a CPU, 9 and 10 are control signals for controlling the modem 2 and the baseband processor 5, respectively.
Is a CPU bus, 13 is a RAM for storing data, and 40 is a ROM for storing instruction codes.

Next, the operation of the conventional mobile terminal device configured as described above will be described with reference to FIG. First, the transmission data 7 input to the baseband processing unit 5 is subjected to processing in the baseband band there. For example, pre-emphasis of audio signals, filter processing such as a compressor, and error correction coding of control data are performed when received in analog format, and high efficiency voice coding of voice signals is performed when received in digital format. , Error correction coding and encryption coding, and control data error correction coding and encryption coding. After being processed, it is output as a modulation signal 4 from the baseband processing unit 5, sent to the modulation / demodulation unit 2, modulated into the RF band, and sent out from the antenna 1.

On the other hand, in the case of reception, a radio wave received by the antenna 1 is demodulated in the modulation / demodulation unit 2 and input to the baseband processing unit 5 as a demodulated signal 3. The demodulated signal 3 input to the baseband processing unit 5 is subjected to, for example, a filtering process such as an expander and a de-emphasis of an audio signal in an analog system, a process of extracting a control signal and correcting an error, and the like. And in the digital system,
Processing such as encryption decryption or error correction is performed, and if the signal is a voice signal, more efficient voice decoding processing is performed.

[0006] The CPU 8 controls the entire mobile terminal device and controls communication with the base station. For example, the control signal 9 is sent to the modulation / demodulation unit 2 to set a used frequency. Similarly, a control signal 10 is sent to the baseband processing unit 5 to set a processing type and exchange control signals. The RAM 13 temporarily stores parameters and the like necessary for the processing of the CPU 8, and the ROM 40 stores the instruction code of the CPU 8, and the CPU 8 operates according to the instruction code.

As described above, in the conventional example,
Since the system is configured corresponding to each mobile communication system (including, for example, an analog system or a digital system), only a voice signal or data of the mobile communication system suitable for the configuration can be transmitted and received. .

[0008]

However, in the conventional mobile terminal device described above, one mobile terminal device is required for one mobile communication system. In order to receive the services of the above, it is necessary to have a plurality of mobile terminal devices, and it is impractical to carry all of them.

[0009] Accordingly, the present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a mobile terminal device capable of coping with a plurality of mobile communication systems by itself without having to carry a plurality of mobile terminals. And

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, a mobile terminal device according to the present invention basically comprises a CPU.
A baseband processing unit and a modulation / demodulation unit capable of coping with various mobile communication systems by changing parameters (mobile communication system, for example, parameters required to select an analog system or a digital system), and instruction codes and parameters of a CPU. Card memory (also referred to as an IC card, in which case it has a memory section) storing a boot program for transferring an instruction code from the IC card memory to the RAM (can be selectively used)
Mobile communication by changing the IC card memory
Change the communication system to support multiple mobile communication systems,
Starts operation according to the instruction code stored in the RAM,
The parameters stored in the IC card memory to the modem unit and the baseband processing unit by initializing
The mobile communication system specified by the IC card is used.

Further, in order to achieve the above object, a mobile terminal device according to the present invention has a baseband processing section for performing processing on a transmission / reception signal in a baseband band, and a modulation / demodulation section for performing modulation / demodulation processing in an IF band and an RF band. A mobile terminal device comprising: an antenna for transmitting and receiving radio waves; and a CPU for controlling a modulation / demodulation unit and a baseband processing unit and controlling communication with a base station. IC card memory that stores the parameters of the modulation and demodulation unit and baseband processing unit corresponding to the system, RAM that stores the instruction codes and parameters transferred from the IC card memory, and instruction codes and parameters that are transferred from the IC card memory to the RAM and a ROM for storing a boot program to be, IC
Change the mobile communication method by changing the card memory and
The CPU starts operation according to the instruction code stored in the RAM, and initializes the parameters stored in the RAM for the modem and baseband processing unit , and specifies the IC card memory by supporting the number of mobile communication systems. Was done
It is characterized by using a mobile communication system .

Further, in order to achieve the above object, a mobile terminal device according to the present invention has a baseband processing section for performing processing on a transmission / reception signal in a baseband band, and a modulation / demodulation section for performing modulation / demodulation processing in an IF band and an RF band. A mobile terminal device comprising: an antenna for transmitting and receiving radio waves; and a CPU for controlling a modulation / demodulation unit and a baseband processing unit and controlling communication with a base station. and a IC card memory which stores the parameters of the modem unit and the baseband processing unit corresponding to the method, by changing the IC card memory
Change the mobile communication system to support multiple mobile communication systems,
The CPU reads the instruction code from the IC card memory and starts the operation, and initializes the parameters of the mobile communication system specified by the IC card memory to the modem and baseband processing unit, thereby setting the IC card memory.
The mobile communication system specified in (1) is used.

Further, in order to achieve the above object, a mobile terminal device according to the present invention comprises: a digital signal processor for performing processing in a baseband band on a transmission / reception signal;
A second RAM for storing an instruction code for operating the digital signal processor, a modulation / demodulation unit for performing modulation / demodulation processing of transmission / reception signals in IF band and RF band, An A / D converter for converting and D / A converting the modulation signal;
An A / D converter, a D / A converter and an A / D converter for D / A converting a received signal output from the digital signal processor and A / D converting a transmission signal input to the digital signal processor; An antenna for transmitting and receiving signals, a CPU for controlling a modem and a digital signal processor to control communication with a base station, a command code for a CPU and a digital signal processor for a specific mobile communication system, and a modem and a digital for the same system. An IC card memory storing parameters of a signal processor, and an IC
It includes a RAM for storing instruction codes and parameters transferred CPU from the card memory, and a ROM storing a boot program to be transferred from the IC card memory instruction codes and parameters of the CPU to RAM, IC Ca
Change the mobile communication method by changing the
The CPU starts operation according to the instruction code of the CPU stored in the RAM, transfers the instruction code of the digital signal processor to the second RAM,
To initialize the parameters stored in the AM modulation and demodulation unit
Mobile communication method specified in IC card memory
It is characterized by being an expression .

Further, in order to achieve the above object, a mobile terminal device according to the present invention comprises: a digital signal processor for performing processing in a baseband band on a transmission / reception signal;
A second RAM for storing an instruction code for operating the digital signal processor, a modulation / demodulation unit for performing modulation / demodulation processing on transmission / reception signals in IF band and RF band, and an A / D converter connected between the modulation / demodulation unit and the digital signal processor for transmitting / receiving the demodulated signal; An A / D converter for converting and D / A converting the modulation signal;
An A / D converter, a D / A converter and an A / D converter for D / A converting a received signal output from the digital signal processor and A / D converting a transmission signal input to the digital signal processor; An antenna for transmitting and receiving signals, a CPU for controlling a modem and a digital signal processor to control communication with a base station, a command code for a CPU and a digital signal processor for a specific mobile communication system, and a modem and a digital for the same system. The mobile communication system is changed by changing the IC card memory.
In addition, in response to a plurality of mobile communication systems, the CPU reads the instruction code from the IC card memory and starts operation, reads the instruction code of the digital signal processor from the IC card memory and transfers it to the second RAM, From the IC card memory and initialize the modem .
Mobile communication specified by the IC card memory
It is characterized by using a system .

Further, in order to achieve the above object, a mobile terminal apparatus according to the present invention has a baseband processing section for performing processing on a transmission / reception signal in a baseband band, and a modulation / demodulation section for performing modulation / demodulation processing in an IF band and an RF band. A mobile terminal device comprising: an antenna for transmitting and receiving radio waves; and a CPU for controlling a modulation / demodulation unit and a baseband processing unit and controlling communication with a base station. A memory unit storing parameters of a modulation / demodulation unit and a baseband processing unit corresponding to the system, and a dedicated circuit having a partial function of the modulation / demodulation unit.
A C card, a RAM for storing command codes and parameters transferred from a memory unit of the IC card memory,
The instruction code and parameters of the CPU are
A ROM storing a boot program to be transferred to the AM, a mobile communication system is changed by changing an IC card to correspond to a plurality of mobile communication systems, and the CPU starts operation by an instruction code stored in the RAM; Initializing the parameters stored in the RAM for the modem and the baseband processing unit to set the mobile communication system specified by the IC card and the dedicated circuit of the IC card
Some devices that cannot be commonly used for each communication method of the modem
The function is specified for the specific mobile communication system.

Further, in order to achieve the above object, a mobile terminal apparatus according to the present invention has a baseband processing section for performing processing on a transmission / reception signal in a baseband band, and a modulation / demodulation section for performing modulation / demodulation processing in an IF band and an RF band. A mobile terminal device comprising: an antenna for transmitting and receiving radio waves; and a CPU for controlling a modulation / demodulation unit and a baseband processing unit and controlling communication with a base station. A memory unit storing parameters of a modulation / demodulation unit and a baseband processing unit corresponding to the system, and a dedicated circuit having a partial function of the modulation / demodulation unit.
C card, and the mobile communication system is changed by changing the IC card to support a plurality of mobile communication systems.
The operation is started by reading the instruction code from the memory unit of the C card, and the parameters are read from the memory unit to initialize the modulation / demodulation unit and the baseband processing unit.
While the mobile communication systems identified by the card, the I
Each communication method of the modulation / demodulation unit by the dedicated circuit of the C card
Some functions that cannot be shared by the formula are specified for the specific mobile communication system.

[0017]

The mobile terminal device according to the present invention is constructed as described above, so that when the power is turned on, the
R from IC card memory by M boot program
An instruction code is transferred to the AM (this step can be selected), and then the operation is started with the instruction code so that the baseband processing unit and the modem unit can support a specific mobile communication system. The parameters are set,
After that, the mobile communication system can be supported. That is, by preparing an IC card memory or an IC card corresponding to each mobile communication system and simply replacing it, it is possible to communicate and transmit / receive data in accordance with any of a plurality of different mobile communication systems. In addition, the dedicated circuit of the IC card uses
Some functions that cannot be shared by communication methods
By setting to the formula, it can correspond to any communication method.
Can be

Further, the mobile terminal device according to the present invention is provided with an IC
ROM storing a boot program for transferring CPU instruction codes and parameters from card memory to RAM
With this configuration, initial settings such as parameter settings can be performed easily and quickly.

As an embodiment of the present invention, the configuration can be made without using a ROM, in which case the circuit is simple and inexpensive. In another embodiment, data processing is simplified by employing a digital signal processor as the baseband processing unit. Further, in another embodiment, a wider range of modulation and demodulation can be performed by providing a dedicated circuit for directly selecting a circuit of a modulation and demodulation unit that cannot be commonly used in each system in the IC card.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the accompanying drawings and FIGS. FIG. 1 is a configuration diagram showing a configuration of a mobile terminal device according to a first embodiment of the present invention, FIG. 2 is a configuration diagram showing a configuration of a mobile terminal device according to a second embodiment of the present invention, and FIG. FIG. 4 is a configuration diagram illustrating a configuration of a mobile terminal device according to a third embodiment, FIG. 4 is a configuration diagram illustrating a configuration of a mobile terminal device according to a fourth embodiment of the present invention, and FIG. FIG. 6 is a configuration diagram illustrating a configuration of a mobile terminal device, and FIG. 6 is a configuration diagram illustrating a configuration of a mobile terminal device according to a sixth embodiment of the present invention.

First, a mobile terminal according to a first embodiment of the present invention will be described in detail with reference to FIG. FIG.
1, 1 is an antenna, 2 is a modulation / demodulation unit that modulates and demodulates a transmission / reception signal, 3 is a demodulation signal, 4 is a modulation signal, 5 is a baseband processing unit that processes transmission / reception data in a baseband band, and 6 is reception data or Reception voice, 7 is transmission data or transmission voice, 8 is a CPU, 9 and 10 are control signals for controlling the modulation / demodulation unit 2 and the baseband processing unit 5, respectively.
11, a CPU bus; 12, a ROM storing a boot program for reading an instruction code from an IC card memory;
Reference numeral 3 denotes a RAM for storing data such as an instruction code read from the IC card memory, and reference numeral 14 denotes an IC card memory for storing an instruction code corresponding to a specific system.

Next, the operation of the mobile terminal device according to the first embodiment configured as described above will be described with reference to FIG. First, when the power is turned on, the CPU 8
Is operated by a boot program stored in the ROM 12, and transfers the contents of the IC card memory 14 (command codes and parameters of the CPU 8 (described below)) to the RAM 13. After the end of the transfer, the CPU 8 starts operating according to the instruction code stored in the RAM 13. At that time, as initial settings, parameters (mobile communication scheme, mobile communication scheme, mobile communication scheme,
For example, parameters necessary for selecting the analog system or the digital system are set. Therefore, thereafter, transmission and reception of voice signals and data are performed by the mobile communication system. The transmission / reception processing is the same as in the conventional example.

That is, the transmission data 7 is subjected to processing in the baseband band in the baseband processing unit 5. For example, if the signal is received in the analog format, pre-emphasis of the audio signal, filtering by a compressor or the like, or error correction encoding of the control data is performed. Processing such as coding, error correction coding, and encryption coding, and processing such as error correction coding and encryption coding of control data are performed. The transmission data 7 processed by the baseband processing unit 5 is output therefrom as a modulation signal 4 and sent to the modulation / demodulation unit 2. Therefore, IF band and R
The signal is modulated to the F band and transmitted from the antenna 1.

On the contrary, the radio wave received by the antenna 1 is demodulated in the modulation / demodulation unit 2 and input to the baseband processing unit 5 as a demodulated signal 3. The baseband processing unit 5 performs, for example, a filtering process such as an expander and a de-emphasis of an audio signal in an analog system, or a process of extracting a control signal and correcting an error. Processing such as decoding and error correction is performed, and if the signal is a voice signal, a more efficient voice decoding process is performed.

The CPU 8 controls the entire mobile terminal device and controls communication with the base station. That is, the frequency used is set for the modem 2 via the control signal 9, and the like.
Through the control signal 10, processing type setting and control signal exchange are performed with respect to the baseband processing unit 5.

As can be seen from the above description, according to this embodiment, by replacing the IC card memory,
Various types of mobile terminal devices having different systems can be easily realized.

Next, a mobile terminal device according to a second embodiment of the present invention will be described in detail with reference to FIG. FIG.
1, 1 is an antenna, 2 is a modulation / demodulation unit that modulates and demodulates a transmission / reception signal, 3 is a demodulation signal, 4 is a modulation signal, 5 is a baseband processing unit that processes transmission / reception data in a baseband band, and 6 is reception data or Reception voice, 7 is transmission data or transmission voice, 8 is a CPU, 9 and 10 are control signals for controlling the modulation / demodulation unit 2 and the baseband processing unit 5, respectively.
11 is a CPU bus, 13 is a RAM for storing data, 1
Reference numeral 4 denotes IC card memories each storing an instruction code corresponding to a specific method.

Next, the operation of the mobile terminal device according to the second embodiment configured as described above will be described with reference to FIG. In this embodiment, the ROM is not used and the CP
U8 reads the instruction code directly from the IC card memory 14 from the time of power-on and starts the operation. At this time, as the initial setting, the control signals 9 and 10 are used to set parameters for the modulation / demodulation unit 2 and the baseband processing unit 5 to correspond to the mobile communication system used there. Therefore, thereafter, transmission and reception of voice signals and data are performed by the mobile communication system. The transmission / reception processing is the same as in the conventional example.

That is, the transmission data 7 is subjected to processing in the baseband band in the baseband processing unit 5. For example, in the analog system, pre-emphasis of an audio signal, filter processing such as a compressor, and error correction encoding of control data are performed. In the digital system, high-efficiency audio encoding, error correction encoding, Processing such as encryption coding and processing such as error correction coding and encryption coding of control data are performed. And
The transmission data 7 processed by the baseband processing unit 5 is output therefrom as a modulation signal 4 and sent to the modulation / demodulation unit 2. Then, the signal is modulated into the IF band and the RF band, and the antenna 1
Sent from.

On the contrary, the radio wave received by the antenna 1 is demodulated in the modulation / demodulation unit 2 and input to the baseband processing unit 5 as a demodulated signal 3. In the baseband processing unit 5, for example, when the signal is received in an analog system, a filter process such as an expander and a de-emphasis of an audio signal or a process of extracting a control signal and correcting an error is performed. If the received signal is a voice signal, processing such as encryption decryption or error correction is performed. If the received signal is a voice signal, a more efficient voice decoding process is performed.

The CPU 8 controls the entire mobile terminal device and controls communication with the base station. That is, the frequency used is set for the modem 2 via the control signal 9, and the like.
Through the control signal 10, processing type setting and control signal exchange are performed with respect to the baseband processing unit 5.

As can be seen from the above description, according to this embodiment, by replacing the IC card memory,
Various types of mobile terminal devices having different systems can be easily realized.

Next, a mobile terminal device according to a third embodiment of the present invention will be described in detail with reference to FIG. FIG.
, 1 is an antenna, 2 is a modulation / demodulation unit for modulating and demodulating a transmission / reception signal, 3 is a demodulation signal, 4 is a modulation signal, 6 is reception data or reception voice, 7 is transmission data or transmission voice, 8 is a CPU, 9 And 10 are control signals for controlling the modem 2 and the digital signal processor (DSP) 21, respectively, and 11 is a CPU bus.

Further, reference numeral 12 denotes a ROM storing a boot program for reading an instruction code from an IC card memory;
3 is a RAM for storing data such as instruction codes read from the IC card memory, 14 is an IC card memory for storing instruction codes corresponding to each specific system, and 20 is A
A digital signal processor 21 for processing transmission / reception data in a baseband band;
2, a D / A converter and an A / D converter; 23, a second RAM storing instructions of the digital signal processor 21;
Reference numeral 4 denotes load data to be loaded from the CPU 8 into the second RAM. That is, in the third embodiment, the A / D converter and the D / A converter 20, the digital signal processor 21, the D / A converter and the A / D converter 22 in the first embodiment The configuration is as follows.

Next, the operation of the mobile terminal device according to the third embodiment configured as described above will be described with reference to FIG. First, when the power is turned on, the CPU 8
Is operated by a boot program stored in the ROM 12, and transfers the contents of the IC card memory 14 to the RAM 13. After the end of the transfer, the CPU 8 starts operating according to the instruction code stored in the RAM 13. The CPU 8 transfers the instruction code for the digital signal processor stored in the IC card memory 14 to the second RAM 23 via the load data 24. After the transfer is completed, the digital signal processor 21 is activated. Since the instruction code for the digital signal processor corresponds to a specific system, parameter setting corresponding to each system is performed only to the modem 2 via the control signal 9. In this way, after setting a specific method, transmission and reception of voice signals and data are performed by the mobile communication method.

During a call, the transmission data 7 is subjected to A / D conversion by a D / A converter and an A / D converter 22, and then processed in a baseband band by a digital signal processor 21. That is, for example, in the case where the digital signal is received by the digital signal processor 21, pre-emphasis of the audio signal, filter processing such as a compressor, and error correction encoding of control data are performed. Performs processing such as high-efficiency voice coding, error correction coding, and encryption coding of a voice signal, and processing such as error correction coding and encryption coding of control data. Thereafter, the output of the digital signal processor 21 is D / A converted by an A / D converter and a D / A converter 20, output therefrom as an analog modulation signal 4, and sent to the modem 2. Then I
The signal is modulated into the F band and the RF band and transmitted from the antenna 1.

On the contrary, the radio wave received by the antenna 1 is demodulated in the modulation / demodulation unit 2 and output as a demodulated signal 3.
After being A / D converted by the / D converter and the D / A converter 20, it is input to the digital signal processor 21. The digital signal processor 21 performs, for example, a filtering process such as an expander and a de-emphasis of an audio signal in an analog system or a process of extracting a control signal and correcting an error. For example, if the signal is an audio signal, a more efficient audio decoding process is performed.

The CPU 8 controls the entire mobile terminal device and controls communication with the base station. That is, the frequency used is set for the modem 2 via the control signal 9, and the like.
Through the control signal 10, setting of the type of processing and exchange of control signals with the digital signal processor 21 are performed.

As can be seen from the above description, according to the present embodiment, by replacing the IC card memory,
Various types of mobile terminal devices having different systems can be easily realized.

As a specific configuration, the RAM 23 may be built in the digital signal processor 21. If the signal input to the digital signal processor 21 is a digital signal, the A / D conversion and the D / A conversion are omitted. can do.

Next, a mobile terminal device according to a fourth embodiment of the present invention will be described with reference to FIG. The fourth embodiment is similar to the second embodiment in that the ROM 12 is not used. First, the instruction code of the CPU 8 is the ROM 1
Instead of being transferred for use by the second boot program, the CPU 8 is configured to read the instruction code directly from the IC card memory and operate. The other points are the same as in the third embodiment, and further description is omitted.

Next, a mobile terminal according to a fifth embodiment of the present invention will be described in detail with reference to FIG. FIG.
1, 1 is an antenna, 2 is a modulation / demodulation unit that modulates and demodulates a transmission / reception signal, 3 is a demodulation signal, 4 is a modulation signal, 5 is a baseband processing unit that processes transmission / reception data in a baseband band, and 6 is reception data or Reception voice, 7 is transmission data or transmission voice, 8 is a CPU, 9 and 10 are control signals for controlling the modulation / demodulation unit 2 and the baseband processing unit 5, respectively.
11, a CPU bus; 12, a ROM storing a boot program for reading an instruction code from an IC card memory;
Reference numeral 3 denotes a RAM for storing CPU instruction codes, parameters, data, and the like read from the IC card memory;
Reference numeral 3 denotes an IC card including a dedicated circuit 34 having a part of the function of a modulation / demodulation unit, and a memory unit 35 each storing an instruction code corresponding to a specific system. This IC card 33 corresponds to the IC card memory 14 in the first embodiment.

Next, the operation of the mobile terminal apparatus according to the fourth embodiment having the above-described configuration will be described with reference to FIG. First, when the power is turned on, the CPU 8
Operates by a boot program stored in the ROM 12 and transfers the contents of the memory unit 35 to the RAM 13. After the end of the transfer, the CPU 8 starts operating according to the instruction code stored in the RAM 13. At this time, as the initial setting, the control signals 9 and 10 are used to set parameters for the modulation / demodulation unit 2 and the baseband processing unit 5 so as to correspond to the mobile communication system used. Therefore, thereafter, transmission and reception of voice signals and data are performed by the mobile communication system.

At the time of a telephone call, the transmission data 7 is processed in the baseband processing unit 5 according to the baseband band. For example, if the signal is received in the analog format, pre-emphasis of the audio signal, filtering by a compressor or the like, or error correction encoding of the control data is performed. Processing such as coding, error correction coding, and encryption coding, and processing such as error correction coding and encryption coding of control data are performed. The transmission data 7 processed by the baseband processing unit 5 is output therefrom as a modulation signal 4 and sent to the modulation / demodulation unit 2. Then, the signal is modulated into the IF band and the RF band and transmitted from the antenna 1.

In this embodiment, when the modem 2 has a function (for example, a circuit such as a filter) that cannot be commonly used in each system, a dedicated circuit 34 is provided in the IC card 33, and a dedicated circuit input is provided. 31 and dedicated circuit output 32
Can be automatically specified to a specific mobile communication system specified by the IC card 33.

Conversely, the radio wave received by the antenna 1 is demodulated in the modulation / demodulation unit 2 and input to the baseband processing unit 5 as a demodulated signal 3. The baseband processing unit 5 performs, for example, a filtering process such as an expander and a de-emphasis of an audio signal in an analog system, or a process of extracting a control signal and correcting an error. Processing such as decoding and error correction is performed, and if the signal is a voice signal, a more efficient voice decoding process is performed.

The CPU 8 controls the entire mobile terminal device and controls communication with the base station. That is, the frequency used is set for the modem 2 via the control signal 9, and the like.
Processing type setting and control signal exchange are performed with the baseband processing unit 5 via the control signal 10.

As can be seen from the above description, according to this embodiment, various mobile terminal devices having different systems can be easily realized by simply replacing the IC card.

Next, a mobile terminal device according to a sixth embodiment of the present invention will be described with reference to FIG. The sixth embodiment is similar to the above-described second embodiment in that the ROM 12 is not used.
Instead of being transferred for use by the second boot program, the CPU 8 is configured to read the instruction code directly from the IC card memory and operate. The other points are the same as in the fifth embodiment, and further description will be omitted.

[0050]

The mobile terminal device according to the present invention is configured as described above, and in particular, executes the instruction code of the CPU for a specific mobile communication system and the parameters set in the modulation / demodulation unit and the baseband processing unit corresponding thereto. I remembered
Equipped with a C card memory or an IC card, the command code and the parameter for the desired mobile communication system are read from the IC card memory or the IC card, the command code is executed, and the parameter is set or changed. By carrying a plurality of IC cards, it is possible to easily cope with a plurality of mobile communication systems with only one mobile terminal device.

In addition, even when the same mobile communication system is used, when the function is changed and improved, it can be easily dealt with only by replacing the IC card memory or the IC card.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a configuration of a mobile terminal device according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram showing a configuration of a mobile terminal device according to a second embodiment of the present invention.

FIG. 3 is a configuration diagram showing a configuration of a mobile terminal device according to a third embodiment of the present invention.

FIG. 4 is a configuration diagram showing a configuration of a mobile terminal device according to a fourth embodiment of the present invention.

FIG. 5 is a configuration diagram showing a configuration of a mobile terminal device according to a third embodiment of the present invention.

FIG. 6 is a configuration diagram illustrating a configuration of a mobile terminal device according to a fourth embodiment of the present invention.

FIG. 7 is a configuration diagram showing a configuration of a conventional mobile terminal device.

[Explanation of symbols]

 Reference Signs List 1 antenna 2 modulation / demodulation unit 3 demodulation signal 4 modulation signal 5 baseband processing unit 6 reception data or audio signal 7 transmission data or audio signal 8 CPU 9 control signal 10 control signal 11 CPU bus 12 boot ROM 13 RAM 14 IC card memory Reference Signs List 20 A / D converter and D / A converter 21 Digital signal processor (DSP) 22 D / A converter and A / D converter 23 Instruction RAM 24 Load data 31 Dedicated circuit input 32 Dedicated circuit output 33 IC card 34 Dedicated circuit 35 Memory unit 40 Instruction ROM

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-5-336035 (JP, A) JP-A-6-291719 (JP, A) JP-A-4-83447 (JP, A) JP-A-5-34847 130255 (JP, A) Japanese Utility Model Hei 4-69933 (JP, U) Special Table 4-503747 (JP, A) Special Table 6-507294 (JP, A) (58) Fields surveyed (Int. Cl. ⁷ , DB name) H04Q ^7/ 00-7/38

Claims (2)

(57) [Claims] 1. A baseband processing section for performing processing in a baseband band on a transmission / reception signal, a modulation / demodulation section for performing modulation / demodulation processing in an IF band and an RF band, an antenna for transmitting / receiving a radio wave, and the modulation / demodulation section and baseband processing. A mobile terminal device comprising a CPU for controlling a communication unit and a base station, and controlling a communication with a base station.
An IC card including a memory unit storing U instruction codes and parameters of the modulation / demodulation unit and the baseband processing unit corresponding to the same system, a dedicated circuit having a part of the function of the modulation / demodulation unit, and a memory unit of the IC card For storing the instruction code and parameters transferred from the RAM
And a ROM storing a boot program for transferring command codes and parameters of the CPU from the memory unit to the RAM. The mobile communication system is changed by changing the IC card to support a plurality of mobile communication systems. Then, the CPU starts operation according to the instruction code stored in the RAM, and initializes the parameters stored in the RAM for the modem and the baseband processing unit, thereby moving the movement specified by the IC card. In addition to the communication method, the dedicated circuit of the IC card
A mobile terminal device characterized in that some functions of the modulation / demodulation unit that cannot be shared by each communication system are specified for the specific mobile communication system. 2. A baseband processing section for performing processing on a transmission / reception signal in a baseband band, a modulation / demodulation section for performing modulation / demodulation processing in an IF band and an RF band, an antenna for transmitting / receiving a radio wave, and the modulation / demodulation section and baseband processing. A mobile terminal device comprising a CPU for controlling a communication unit and a base station, and controlling a communication with a base station.
An IC card comprising a memory unit storing a command code of U and parameters of the modulation / demodulation unit and the baseband processing unit corresponding to the same system and a dedicated circuit having a part of the function of the modulation / demodulation unit; Change the mobile communication system by changing to support multiple mobile communication systems,
The CPU reads out the instruction code from the memory unit of the IC card and starts operation, reads out the parameters from the memory unit and initializes the modem and the baseband processing unit to identify the IC card. In addition to the mobile communication method, the IC card
Circuit cannot be commonly used for each communication system of the modem.
A mobile terminal device characterized in that some functions are specified for the specific mobile communication system.