JP2012027827A - Data communication system, data communication method, data communication control program and infrared communication device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a data communication system enabling a portable information terminal without an infrared communication function to perform transmission and reception of information with a portable phone and a portable information terminal comprising the infrared communication function, by using infrared communication.SOLUTION: A portable information terminal reads predetermined digital data stored in a storage device provided in the portable information terminal, converts the read predetermined digital data into analog audio data, transfers the converted analog audio data to an audio reproducing buffer provided in the portable information terminal, and outputs the transferred analog audio data to an infrared communication device as one output channel signal by first audio data output means provided in the portable information terminal. The infrared communication device converts the analog audio data output by the first audio data output means into digital data, and transmits the converted digital data via an infrared transceiver provided in the infrared communication device.

Description

  The present invention relates to a technique for performing infrared communication with an external device having an infrared communication function using a portable information terminal and an infrared communication device connected thereto.

  In recent years, mobile phones with infrared communication functions have become widespread. Infrared data communication protocols have been standardized by IrDA (Infrared Data Association), so infrared data communication is possible between mobile phones of different carriers. It has become a situation. Under such circumstances, mobile phone users are increasingly using infrared data communication functions to easily exchange personal information such as e-mail addresses, addresses, and profiles.

  In addition, before most mobile phones with domestic specifications were equipped with an infrared communication function, an infrared communication device was externally connected to the mobile phone to realize infrared communication between mobile phones not equipped with an infrared communication function. These techniques are being studied (Patent Document 1, etc.).

On the other hand, portable information terminals called smartphones with various functions added to cellular phones are widespread. The portable information terminal is connected to the Internet and collects information. It is similar to a PC (Personal Computer), PIM (Personal Information) such as schedule management and address book management
It is used in a wide range of applications, such as usage forms as Manager.

JP 2002-124907 A

  However, there are many portable information terminals that do not have an infrared communication function, and users of such portable information terminals must exchange information using infrared communication with mobile phone users and other portable information terminal users. There is a problem that cannot be done.

  Therefore, in view of the above-described problems, the present invention performs transmission / reception of information using infrared communication with a mobile phone and a portable information terminal having an infrared communication function, even if the portable information terminal does not have an infrared communication function. An object of the present invention is to provide a data communication system.

  One form of the disclosed data communication system is a data communication system including a portable information terminal including an audio input / output terminal and an infrared communication device connected to the portable information terminal via the audio input / output terminal. The information terminal includes a reading unit that reads predetermined digital data held in a storage device included in the portable information terminal, and a first D that converts the predetermined digital data read by the reading unit into analog audio data. / A conversion means, transfer means for transferring the analog audio data converted by the first D / A conversion means to an audio reproduction buffer included in the portable information terminal, and the analog audio transferred by the transfer means Output data to the infrared communication device as one output channel signal First audio data output means, wherein the infrared communication device converts the analog audio data output by the first audio data output means into digital data. And infrared transmission means for transmitting the digital data converted by the first A / D conversion means via an infrared transceiver included in the infrared communication device.

  Further, according to an embodiment of the disclosed data communication system, the infrared communication device includes an infrared receiving unit that receives digital data via the infrared transceiver, and converts the digital data received by the infrared receiving unit into analog audio data. Second D / A converting means for outputting the analog audio data converted by the second D / A converting means to an audio recording buffer included in the portable information terminal as a recording channel signal. Output means, and the portable information terminal converts the analog audio data output by the second audio data output means into digital data, second A / D conversion means, The digital data converted by the A / D conversion means is stored in the storage device. And having a digital data writing means for writing to the constant memory area, the.

  Even if the disclosed data communication system is a portable information terminal that does not have an infrared communication function, it can exchange information using infrared communication with a mobile phone and a portable information terminal that have an infrared communication function.

It is a figure explaining the outline | summary of the infrared data communication in the data communication system which concerns on this Embodiment. It is a figure explaining the outline | summary of the data communication system which concerns on this Embodiment. It is a functional block diagram of the data communication system which concerns on this Embodiment. It is a figure which shows an example of the display screen in the portable information terminal which concerns on this Embodiment. It is a figure which shows the hardware structural example of the portable information terminal which concerns on this Embodiment. It is a figure which shows the hardware structural example of the infrared communication apparatus which concerns on this Embodiment. It is a flowchart which shows the flow of the data transmission process by the data communication system which concerns on this Embodiment. It is a flowchart which shows the flow of the data transmission process by the data communication system which concerns on this Embodiment. It is a flowchart which shows the flow of the power supply process by the data communication system which concerns on this Embodiment. It is a flowchart which shows the flow of the power saving process by the data communication system which concerns on this Embodiment.

DESCRIPTION OF EMBODIMENTS Embodiments for carrying out the present invention will be described with reference to the drawings.
(Outline of data communication system)

  An outline of infrared data communication by the data communication system 500 according to the present embodiment will be described with reference to FIG. FIG. 1 is a diagram for explaining the outline of data communication using infrared rays performed between the data communication system 500 and other mobile phones and portable information terminals. Here, the data communication using infrared rays may be, for example, a communication method standardized by IrDA (Infrared Data Association) or another communication method.

  As shown in FIG. 1, the data communication system 500 can perform data communication using infrared rays with a mobile phone or a portable information terminal having an infrared communication function. Specifically, when the infrared communication application 290 is activated in the data communication system 500, the data communication system 500 starts infrared data communication with other devices in accordance with a predetermined operation rule. Here, the predetermined operation rules include selection of transmission processing / reception processing, selection of transmission data in transmission processing, selection of storage location of reception data in reception processing, and the like. The information exchanged between devices in data communication may be user information such as an email address, name / address / birth date (so-called profile), or image data other than user information. good.

  Next, the outline of the configuration of the data communication system 500 will be described with reference to FIG. FIG. 2 is a schematic explanatory diagram of the data communication system 500. As shown in FIG. 2, the data communication system 500 includes a portable information terminal 100 and an infrared communication device 300, and a phone plug (phone plug) included in the infrared communication device 300 is connected to an audio input / output terminal 190 included in the portable information terminal 100. ) Insert 460 and use. Note that the audio input / output terminal 190 and the phone plug 460 have four poles: an L pole, an R pole, a Mic pole, and a Gnd pole.

  When the application 290 on the portable information terminal 100 side is activated, the audio input / output terminal 190 and the phone plug 460 perform processing for transmitting and receiving to / from an external device via the four poles of the L pole, the R pole, the Mic pole, and the Gnd pole. Send and receive target data.

(Operation principle of data communication system)
The operation principle of the data communication system 500 according to the present embodiment will be described with reference to FIG. FIG. 3 is a functional block diagram of the data communication system. As shown in FIG. 3, the data communication system 500 includes a portable information terminal 100 and an infrared communication device 300.

  The portable information terminal 100 includes a reading unit 110, a first D / A conversion unit 120, a transfer unit 130, a first audio data output unit 140, a second A / D conversion unit 150, a writing unit 160, and a storage. The apparatus 170 includes an audio playback buffer 180, an audio input / output terminal 190, and an audio recording buffer 200. On the other hand, the infrared communication device 300 includes a first A / D conversion unit 310, an infrared transmission unit 320, an infrared reception unit 330, a second D / A conversion unit 340, a second audio data output unit 350, and a power supply unit. 360, first power saving means 370, second power saving means 380, third power saving means 390, and infrared transceiver 400. First, each unit included in the portable information terminal 100 will be described.

  The reading unit 110 reads processing target data (data stored in digital format) that is stored in the storage device 170 of the portable information terminal 100 and is transmitted to the external device. Here, the data to be processed may be in a form in which the data itself or the data storage location is determined in advance, or in a form that is selected every time processing is performed. Further, the processing target data may be user information such as a mail address, name / address / birth date (so-called profile), or image data that is not user information. Note that the processing of the reading unit 110 is triggered by the activation of the infrared communication application 290. For example, as illustrated in FIG. 4, when the infrared communication application 290 on the operation screen 260 of the portable information terminal 100 is selected and an execution instruction is given, the processing of the reading unit 110 is started.

  The first D / A conversion unit 120 converts the digital data read by the reading unit 110 into analog audio data. Further, the first D / A conversion means 120 may be configured to convert digital data into analog audio data using Manchester code. Here, Manchester code is one of the data transmission code formats, in which the change in the transmission level is represented by 0 and 1 codes, the change from the low level to the high level is 0, and from the high level to the low level. Although the change to the level is represented by 1 respectively, the reverse conversion rule may be used in the present embodiment.

  The transfer unit 130 transfers the analog audio data generated (converted) by the first D / A conversion unit 120 to the audio reproduction buffer 180. Here, the audio reproduction buffer 180 is a storage area for temporarily buffering sound data to be reproduced when the portable information terminal 100 performs sound data reproduction processing.

  The first audio data output means 140 outputs the analog audio data buffered in the audio reproduction buffer 180 to the infrared communication device 300 via the L pole and R pole of the audio input / output terminal 190. Here, the data output from the L pole and the data output from the R pole have the same waveform with a phase difference π.

  The second A / D conversion means 200 converts analog audio data buffered in the audio recording buffer 200 into digital data. The second A / D conversion means 200 may be configured to convert analog audio data into digital data using Manchester code. Here, the audio recording buffer 200 is a storage area for temporarily buffering sound data to be recorded when the portable information terminal 100 performs sound data recording processing.

  The writing unit 160 stores the digital data generated (converted) by the second A / D conversion unit 200 in a predetermined location of the storage device 170. Here, the predetermined location may be in a predetermined form, or may be in a form defined in the digital data generated (converted) by the second A / D conversion unit 200. Further, the predetermined location may be set by the user or the like each time the writing unit 160 performs processing.

  Next, each unit included in the infrared communication device 300 will be described. The first A / D conversion unit 310 converts the analog audio data output by the first audio data output unit 140 acquired via the L pole of the audio input / output terminal 190 into digital data. Further, the first A / D conversion means 310 may convert analog audio data into digital data using Manchester code.

  The infrared transmission unit 320 transmits the digital data generated (converted) by the first A / D conversion unit 310 to an external device having an infrared communication function via the infrared transceiver 400. Here, the infrared transmission means 320 transmits data in accordance with an infrared communication protocol defined by IrDA.

  The infrared receiving means 330 receives digital data transmitted from an external device having an infrared communication function via the infrared transceiver 400. Here, the infrared receiving means 330 receives data in accordance with an infrared communication protocol defined by IrDA.

  The second D / A conversion means 340 converts the digital data received by the infrared receiving means 330 into analog audio data. Further, the second D / A conversion means 340 may be configured to convert digital data into analog audio data using Manchester code.

  The second audio data output means 350 outputs the analog audio data generated (converted) by the second D / A conversion means 340 to the audio recording buffer 200 via the Mic pole of the audio input / output terminal 190.

  The power supply means 360 sends the analog audio data obtained by the first audio data output means 140 acquired via the R pole of the audio input / output terminal 190 to a voltage doubler circuit (for example, a half-wave voltage doubler rectifier circuit). input. Then, the power supply unit 360 supplies power obtained as an output of the voltage doubler circuit to an MCU (Micro Controller Unit) 410 included in the infrared communication device 300, and drives the MCU 410. Here, one or more of the first A / D conversion means 310, the infrared transmission means 320, the infrared reception means 330, the second D / A conversion means 340, and the second audio data output means 350 are , Executed by the MCU 410.

  The first power saving unit 370 performs control to set the operating frequency of the MCU 410 to be lower than the rated upper limit frequency of the MCU 410. Here, “setting low” may be ½ of the rated upper limit frequency or ¼ of the rated upper limit frequency. Thus, by reducing the power consumption in the MCU 410, the MCU 410 can be operated based on the power supplied by the power supply unit 360.

  The second power saving unit 380 performs control to close unused ports of the MCU 410. Thus, by closing the unused port, standby power is reduced and power consumption in the MCU 410 is reduced, so that the MCU 410 can be operated based on the power supplied by the power supply unit 360.

  The third power saving unit 390 performs control to make the output of the infrared transceiver 400 smaller than the rated upper limit output. Thus, by reducing the power consumption in the infrared transceiver 400, the MCU 410 can be operated based on the power supplied by the power supply unit 360.

  Here, when the first A / D conversion unit 310 uses the L channel signal, the power supply unit 360 uses the R channel signal, and the first A / D conversion unit 310 uses the R channel signal. The power supply unit 360 uses an L channel signal. Further, the first A / D conversion unit 310 and the power supply unit 360 may use signals of the same channel.

(Hardware configuration of portable information terminal)
An example of the hardware configuration of portable information terminal 100 according to the present embodiment will be described with reference to FIG. FIG. 5 is a diagram illustrating an example of a hardware configuration of the portable information terminal 100.

As shown in FIG. 5, a portable information terminal 100 includes a CPU (Central Processing Unit) 210, a ROM (Read-Only Memory) 220, a RAM (Random
An access memory 230, a flash memory 240, a wireless communication unit 250, a display device 260, an audio input / output terminal 190, and an external connection terminal 270.

  The CPU 210 is a device that executes a program stored in the ROM 220. The CPU 210 performs arithmetic processing on the data expanded (loaded) in the RAM 230 in accordance with an instruction of the program and controls the entire portable information terminal 100. The ROM 220 stores programs executed by the CPU 210 and data. When the CPU 210 executes a program stored in the ROM 220 by the CPU 210, the program or data to be executed is expanded (loaded), and temporarily holds the operation data during the operation.

  The flash memory 240 is a device that stores an OS, which is basic software, an application program according to the present embodiment, and the like together with related data. For example, the flash memory 240 stores digital data to be processed by the reading unit 110 and the writing unit 160.

The wireless communication unit 250 is a unit for providing a wireless communication function such as a mobile phone or a wireless LAN (Local Area Network). The display device 260 is an LCD (Liquid
Crystal Display) is a device that functions as a user interface when the user uses the functions of the portable information terminal 100 and makes various settings. The audio input / output terminal 190 is a terminal for connecting headphones or earphones and outputting sound information to the outside, and is a terminal corresponding to four poles of L pole, R pole, Mic pole, and Gnd pole. The external connection terminal 270 is an interface for performing data transmission / reception with an external device in a wired manner.

  Here, each unit included in the portable information terminal 100 may be realized by the CPU 210 executing a program corresponding to each unit stored in the ROM 220 or the flash memory 240. Moreover, each means which the portable information terminal 100 has is good also as a form which implement | achieves the process regarding the said each means as a hardware.

(Hardware configuration of infrared communication device)
An example of the hardware configuration of the infrared communication apparatus 300 according to the present embodiment will be described with reference to FIG. FIG. 6 is a diagram illustrating an example of a hardware configuration of the infrared communication device 300.

  As illustrated in FIG. 6, the infrared communication device 300 includes a CPU 420, a ROM 430, a RAM 440, various electronic circuits 450, an audio input / output terminal 460, and an infrared receiver 400. Here, the MCU (Micro Controller Unit) 410 may include a CPU 420, a ROM 430, and a RAM 440.

  The CPU 420 is a device that executes a program stored in the ROM 430. The CPU 420 performs arithmetic processing on the data expanded (loaded) in the RAM 440 according to the instructions of the program, and controls the entire infrared communication device 300. The ROM 430 stores programs and data executed by the CPU 420. When the CPU 420 executes a program stored in the ROM 430, the RAM 440 develops (loads) the program and data to be executed, and temporarily holds the operation data during the operation.

  The various electronic circuits 450 include a voltage doubler circuit used by the power supply unit 360, an electronic circuit used for voltage conversion and waveform shaping, and the like. The audio input / output terminal 460 is a terminal (phone plug) for connecting to the audio input / output terminal 190 and corresponds to four channels of L channel, R channel, Mic channel, and Gnd channel. The infrared receiver 400 is a device for transmitting and receiving data with an external device using infrared rays.

  Here, each unit included in the infrared communication device 300 may be realized by the CPU 420 executing a program corresponding to each unit stored in the ROM 430. In addition, each unit included in the infrared communication device 300 may be configured to implement processing related to each unit as hardware.

(Flow of data transmission processing by data communication system)
The flow of data transmission processing by the data communication system 500 according to the present embodiment will be described using FIG. FIG. 7 is a flowchart illustrating an example of data transmission processing by the data communication system 500. When the infrared communication application 290 is selected on the operation screen 260 shown in FIG. 4 and an execution instruction is given, the process of S10 is started.

  In S <b> 10, the reading unit 110 reads the processing target digital data stored in the storage device 170 and transfers it to the RAM 230. In S20, the first D / A conversion unit 120 converts the processing target data read into the RAM 230 into analog audio data using Manchester code.

  In S <b> 30, the transfer unit 130 transfers the analog audio data generated by the first D / A conversion unit 120 from the RAM 230 to the audio reproduction buffer 180. Here, when the audio playback buffer 180 is prepared on the RAM 230, the transfer unit 130 transfers analog audio data to an area allocated as the audio playback buffer 180.

  In S 40, the first audio data output unit 140 outputs the analog audio data transferred to the audio playback buffer 180 by the transfer unit 130 to the infrared communication device 300 via the L channel of the audio input / output terminal 190.

In S50, the first A / D converter 310 converts the L channel signal, which is analog audio data acquired from the portable information terminal 100, into digital data using Manchester code. Here, before the A / D (Analog / Digital) conversion process by the first A / D conversion unit 310, a waveform shaping process or a voltage conversion process may be performed on the L channel signal. In addition, the first A / D conversion unit 310 may perform the A / D conversion process and the frequency conversion process. For example, in the present embodiment, the first A / D conversion unit 310 is 11.025 kHz. Are converted into digital data of 9.6 kbps.
In S60, the infrared transmission unit 320 transmits the digital data generated by the first A / D conversion unit 310 to the external device via the infrared transceiver 400.

  By performing such processing, even in the portable information terminal 100 that does not have the infrared communication function, the audio input / output terminal 190 is used to transmit data by infrared with other devices having the infrared communication function. be able to.

(Flow of data reception processing by data communication system)
The flow of data reception processing by the data communication system 500 according to the present embodiment will be described using FIG. FIG. 8 is a flowchart illustrating an example of data reception processing by the data communication system 500. When the infrared communication application 290 is selected on the operation screen 260 shown in FIG. 4 and an execution instruction is given, the process of S110 is started.

  In S <b> 110, the infrared receiving unit 330 receives digital data transmitted by another device having an infrared communication function via the infrared transceiver 400. In S120, the second D / A converter 340 converts the digital data received by the infrared receiver 330 into analog audio data using Manchester code.

  In S130, the second audio data output means 350 outputs the analog audio data generated by the second D / A conversion means 340 to the audio recording buffer 200 as a Mic channel signal via the audio input / output terminal 190. . Here, after the D / A (Digital / Analog) conversion processing by the second D / A conversion means 340, the Mic channel signal may be subjected to waveform shaping processing or voltage conversion processing. The audio recording buffer 200 may be a predetermined storage area provided on the RAM 230.

  In step S140, the second A / D conversion unit 150 converts the analog audio data output to the audio recording buffer 200 into digital data using a Manchester code, and writes the digital data in a predetermined work area on the RAM 230. In S150, the writing unit 160 stores the digital data generated by the second A / D conversion unit 150 and written to the work area on the RAM 230 in a predetermined location of the storage device 170. Here, the predetermined location may be a predetermined storage location or a form defined in the digital data generated (converted) by the second A / D conversion means 200. Further, the predetermined place may be in a form set by the user or the like each time processing is performed by the writing unit 160.

  By performing such processing, even in the portable information terminal 100 that does not have the infrared communication function, by using the audio input / output terminal 190, infrared data reception is performed with another device having the infrared communication function. be able to.

(Flow of power supply processing by data communication system)
The flow of power supply processing by the data communication system 500 according to the present embodiment will be described with reference to FIG. FIG. 9 is a flowchart illustrating an example of power supply processing by the data communication system 500. When the infrared communication application 290 is selected on the operation screen 260 shown in FIG. 4 and an execution instruction is given, the process of S210 is started.

  In S <b> 210, the reading unit 110 reads digital data to be processed stored in the storage device 170 and transfers it to the RAM 230. In S220, the first D / A converter 120 converts the processing target data read into the RAM 230 into analog audio data using Manchester code.

  In S230, the transfer unit 130 transfers the analog audio data generated by the first D / A conversion unit 120 from the RAM 230 to the audio reproduction buffer 180. Here, when the audio playback buffer 180 is prepared on the RAM 230, the transfer unit 130 transfers analog audio data to an area allocated as the audio playback buffer 180.

  In S240, the first audio data output unit 140 outputs the analog audio data transferred to the audio reproduction buffer 180 by the transfer unit 130 to the infrared communication device 300 via the R channel of the audio input / output terminal 190.

In S250, the power supply means 360 inputs the acquired R channel signal to the half-wave rectification voltage doubler rectifier circuit and boosts the input signal. In S260, the power supply unit 360 inputs the R channel signal boosted by the half-wave rectification voltage doubler rectifier circuit to the MCU 410 and the infrared transceiver 400.
By doing so, the infrared communication apparatus 300 can drive the MCU 410 and the infrared transceiver 400 included in the infrared communication apparatus 300 without including a power supply.

(Power saving process flow by data communication system)
The flow of power saving processing by the data communication system 500 according to the present embodiment will be described with reference to FIG. FIG. 10 is a flowchart illustrating an example of power saving processing by the data communication system 500.

  When the setting to execute the process by the first power saving unit 370 is performed in S310 (Yes in S310), the first power saving unit 370 sets the operation frequency of the MCU 410 to be lower than the rated upper limit frequency of the MCU 410 in S320. Control. Thus, by reducing the power consumption in the MCU 410, the MCU 410 can be operated based on the power supplied by the power supply unit 360.

  If the setting to execute the process by the second power saving unit 380 is performed in S330 (Yes in S330), the second power saving unit 380 performs control for closing the unused port of the MCU 410 in S340. Thus, by closing the unused port, standby power is reduced and power consumption in the MCU 410 is reduced, so that the MCU 410 can be operated based on the power supplied by the power supply unit 360.

  If the setting to execute the process by the third power saving unit 390 is made in S350 (Yes in S350), the third power saving unit 390 makes the output of the infrared transceiver 400 smaller than the rated upper limit output in S360. Control. Thus, by reducing the power consumption in the infrared transceiver 400, the MCU 410 can be operated based on the power supplied by the power supply unit 360.

  By providing the first power saving unit 370, the second power saving unit 380, and the third power saving unit 390 as described above, the infrared communication device 300 does not have its own power source, The MCU 410 and the infrared transceiver 400 that are provided can be driven.

(Summary)
Even if the disclosed data communication system is a portable information terminal that does not have an infrared communication function, it can exchange information using infrared communication with a mobile phone and a portable information terminal that have an infrared communication function.

  In addition, the infrared communication device constituting the disclosed data communication system can drive the MCU and the infrared transceiver included in the infrared communication device without providing a power source.

  Although the embodiment of the present invention has been described in detail above, the present invention is not limited to the specific embodiment, and various modifications are possible within the scope of the gist of the present invention described in the claims.・ Change is possible.

100 portable information terminal 110 reading means 120 first D / A conversion means 130 transfer means 140 first audio data output means 150 second A / D conversion means 160 writing means 170 storage device 180 audio reproduction buffer 190 audio input / output Terminal 200 Audio recording buffer 210 CPU
220 ROM
230 RAM
240 Flash memory 250 Wireless communication unit 260 Display device 270 External connection terminal 290 Data communication control program (infrared communication application)
300 Infrared communication device 310 First A / D conversion means 320 Infrared transmission means 330 Infrared reception means 340 Second D / A conversion means 350 Second audio data output means 360 Power supply means 370 First power saving means 380 Second power saving means 390 Third power saving means 400 Infrared transceiver 410 MCU
420 CPU
430 ROM
440 RAM
450 Various electronic circuits 460 Audio input / output terminal 500 Data communication system

Claims (16)

A data communication system including a portable information terminal including an audio input / output terminal and an infrared communication device connected to the portable information terminal via the audio input / output terminal,
The portable information terminal
Reading means for reading predetermined digital data held in a storage device included in the portable information terminal;
First D / A conversion means for converting the predetermined digital data read by the reading means into analog audio data;
Transfer means for transferring the analog audio data converted by the first D / A conversion means to an audio reproduction buffer provided in the portable information terminal;
First analog audio data output means for outputting the analog audio data transferred by the transfer means to the infrared communication device as a single output channel signal;
The infrared communication device is:
First A / D conversion means for converting the analog audio data output by the first audio data output means into digital data;
Infrared transmission means for transmitting the digital data converted by the first A / D conversion means via an infrared transceiver included in the infrared communication device. The infrared communication device is:
Infrared receiving means for receiving digital data via the infrared transceiver;
Second D / A conversion means for converting the digital data received by the infrared receiving means into analog audio data;
Second audio data output means for outputting the analog audio data converted by the second D / A conversion means as a recording channel signal to an audio recording buffer provided in the portable information terminal;
The portable information terminal
Second A / D conversion means for converting the analog audio data output by the second audio data output means into digital data;
2. The data communication system according to claim 1, further comprising digital data writing means for writing the digital data converted by the second A / D conversion means to a predetermined storage area of the storage device. . The first audio data output means outputs the analog audio data as the other output channel signal to the infrared communication device,
A power source for driving the infrared communication device using output power obtained by inputting the analog audio data output as the other output channel signal by the first audio data output means to a half-wave voltage doubler rectifier circuit 3. The data communication system according to claim 1, further comprising supply means.   The first D / A conversion means, the first A / D conversion means, the second D / A conversion means, and the second A / D conversion means use a Manchester code to generate audio data The data communication system according to any one of claims 1 to 3, wherein conversion between digital data is performed.   5. The apparatus according to claim 1, further comprising a first power saving unit configured to lower an operating frequency of an MCU (Micro Controller Unit) included in the infrared communication device to be lower than a rated upper limit frequency of the MCU. The data communication system described.   6. The data communication system according to claim 1, further comprising a second power saving unit that closes an unused port of an MCU (Micro Controller Unit) included in the infrared communication device.   The data communication system according to any one of claims 1 to 6, further comprising third power saving means for making the output of the infrared transceiver smaller than a rated upper limit output of the infrared transceiver. A data communication method in a data communication system including a portable information terminal including an audio input / output terminal and an infrared communication device connected to the portable information terminal via the audio input / output terminal,
In the portable information terminal,
A step of reading out predetermined digital data held in a storage device included in the portable information terminal; and
First D / A conversion means converting the predetermined digital data read by the reading means into analog audio data;
A transfer unit transferring the analog audio data converted by the first D / A conversion unit to an audio reproduction buffer included in the portable information terminal;
First audio data output means, outputting the analog audio data transferred by the transfer means to the infrared communication device as one output channel signal,
In the infrared communication device,
A first A / D conversion means for converting the analog audio data output by the first audio data output means into digital data;
And a step of transmitting the digital data converted by the first A / D converter through an infrared transceiver included in the infrared communication device. In the infrared communication device,
An infrared receiving means for receiving digital data via the infrared transceiver;
A second D / A converting means for converting the digital data received by the infrared receiving means into analog audio data;
A second audio data output means outputting the analog audio data converted by the second D / A conversion means as a recording channel signal to an audio recording buffer provided in the portable information terminal;
In the portable information terminal,
A second A / D conversion means for converting the analog audio data output by the second audio data output means into digital data;
The digital data writing means includes a step of writing the digital data converted by the second A / D conversion means into a predetermined storage area of the storage device. Data communication method. The first audio data output means outputs the analog audio data as the other output channel signal to the infrared communication device,
Power supply means uses the output power obtained by inputting the analog audio data output as the other output channel signal by the first audio data output means to a half-wave voltage doubler rectifier circuit, and the infrared communication 10. The data communication method according to claim 8, further comprising a step of driving the device.   The first D / A conversion means, the first A / D conversion means, the second D / A conversion means, and the second A / D conversion means use a Manchester code to generate audio data The data communication method according to any one of claims 8 to 10, wherein conversion between digital data is performed.   The first power saving means includes a step of lowering an operating frequency of an MCU (Micro Controller Unit) included in the infrared communication device below a rated upper limit frequency of the MCU. The data communication method according to claim 1.   The data communication according to any one of claims 8 to 12, wherein the second power saving means includes a step of closing an unused port of an MCU (Micro Controller Unit) included in the infrared communication device. Method.   The data communication method according to any one of claims 8 to 13, wherein the third power saving means includes a step of making an output of the infrared transceiver smaller than a rated upper limit output of the infrared transceiver. For portable information terminals equipped with audio input / output terminals,
A reading step of reading predetermined digital data held in a storage device included in the portable information terminal;
A first D / A conversion step of converting the predetermined digital data read by the reading step into analog audio data;
A transfer step of transferring the analog audio data converted by the first D / A conversion step to an audio reproduction buffer included in the portable information terminal;
An audio data output step of outputting the analog audio data transferred in the transfer step as a single output channel signal; and
A second A / D conversion step for converting analog audio data input as a recording channel signal to the audio recording buffer into digital data;
A data communication control program for executing a digital data writing means for writing the digital data converted by the second A / D conversion step into a predetermined storage area of the storage device. First A / D conversion means for converting analog audio data acquired as one output channel signal into digital data;
Infrared transmission means for transmitting the digital data converted by the first A / D conversion means via an infrared transceiver, and
Infrared receiving means for receiving digital data via the infrared transceiver;
Second D / A conversion means for converting the digital data received by the infrared receiving means into analog audio data;
An infrared communication apparatus comprising: second audio data output means for outputting the audio data converted by the second D / A conversion means as a recording channel signal.

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