JP2007052559A - Wireless data transmission system, information processor, information processing method and computer program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To desirably transmit image data inside a memory card installed in a cellphone to external equipment such as a television set by reflected wave communication. <P>SOLUTION: An image imaged by the camera-equipped cellphone is stored in the memory card. When a user browses the image to select the image to be transmitted, a file name of the selected image is transferred to the external equipment by use of an infrared communication function equipped in the cellphone. In the external equipment, when extracting the file name from a received infrared command, reading request is made to a wireless communication function loaded in the memory card to acquire the selected image. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a wireless data transmission system, an information processing apparatus, an information processing method, and a computer program that perform data transmission between information devices by wireless communication, and in particular, transmits radio waves from a reflected wave reader, Wireless data transmission system, information processing apparatus, information processing method, and computer for performing data transmission between information devices by reflected wave communication in which a reflected wave with respect to a received radio wave is modulated in accordance with transmission data and transmitted by backscatter transmission・ Regarding the program.

  More specifically, the present invention relates to a wireless data transmission system for transmitting data in a memory card mounted on a host device such as a digital camera or a mobile phone to an external device such as a television receiver by reflected wave communication, information processing BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus, an information processing method, and a computer program. The present invention relates to a method and a computer program.

  Many information devices, including digital cameras (including mobile phones with cameras), use cartridge-type memories such as memory cards and USB memory to store images and other data that cannot be stored in the built-in memory. The device is detachably attached. The memory card here has a plurality of standards such as “MEMORY STICK (registered trademark)” and “SD (Secure Digital) card”, but in the following, the removable memory device is generally referred to as “memory card”. I will call it.

  The image file recorded on the memory card can be moved to another information device such as a personal computer for image processing, image management, large screen display, printout, and the like. As a method of moving data on the memory card, remove the memory card and insert it into the destination device, or use a USB or other general purpose device between the digital camera with the memory card attached and the destination external device. It has been common to perform data communication by interconnecting with cables.

  On the other hand, if the data on the memory card can be transferred using the wireless interface, it is not necessary to change the connector and route the cable every time data is transmitted, which is highly convenient. For example, proposals have been made for external memory media with a built-in wireless communication function (see, for example, Patent Document 1). A host device such as a digital camera is equipped with such an external memory medium, and can transmit and receive data to and from the communication network by driving wireless communication means in the memory medium.

  As a wireless data communication system between information terminals, for example, wireless LAN such as IEEE802.11 and Bluetooth communication are widely known. However, the wireless LAN was originally designed and developed on the assumption that it would be used on a computer. When used as a wireless communication module for a memory card, the mobile LAN is a mobile system that mounts a memory card and supplies drive power. Power consumption becomes a problem for devices. Many of the IEEE802.11b wireless LAN cards currently on the market have a power consumption of 800 mW or more at the time of transmission and 600 mW or more at the time of reception, which places a heavy burden on the battery. Further, the Bluetooth communication has a low transmission speed of 720 kbps at the maximum, and it takes time and inconvenience for image transmission with high image quality.

  On the other hand, in the wireless data communication system using reflected wave communication, low power consumption and small size can be realized. The reflected wave transmission system includes a reflector that transmits data using a modulated reflected wave, and a reflected wave reader that reads data from the reflected wave from the reflector, and the reflected wave reader transmits an unmodulated carrier. On the reflector side, for example, the data can be transmitted by performing a modulation process according to the transmission data on the reflected wave of the unmodulated carrier by operating the load impedance at the end of the antenna (for example, see Patent Document 2) ).

  In the reflected wave transmission system, the antenna switch for changing the load impedance of the antenna is generally composed of a gallium arsenide IC, and its power consumption is several tens of μW or less. Therefore, the average power during data transmission is In the case of the delivery confirmation method, data transmission is possible at 10 mW or less, and in the unidirectional transmission, data transmission is several tens of μW. This is an overwhelming performance difference compared to the average power consumption of a general wireless LAN (see, for example, Patent Document 3).

  Further, the communication operation for transmitting the reflected wave signal can be realized under the control of the external device provided with the reflected wave reader, and does not involve the control of the host device to which the memory card is mounted. In other words, the host device is completely free from problems such as device driver installation and update accompanying communication protocol version changes. Further, the area of the wireless module is extremely small as compared with the wireless LAN.

  By the way, when a large number of image files are stored in the memory card, it is necessary to specify which file should be transferred to the external device.

  The memory card for storing the transmission data does not have a user interface for designating data to be transmitted even though it has a wireless communication means for data transmission. That is, the image data selection operation cannot be directly performed on the memory card itself.

  On the other hand, a digital camera or a camera-equipped mobile phone to which a memory card is attached has a user interface. However, when the reflected wave communication method is applied to the wireless communication interface, since the communication operation is out of the control of the host device (described above), the image can be viewed from the digital camera but transmitted. It cannot be specified as an image.

  For this reason, information related to images stored in the memory card, such as a list of image files and a list of image thumbnails, is once read from the memory card to the external device and displayed on the external device side. After selecting a desired image, it is necessary to perform a laborious operation of acquiring the selected image from the memory card by reflected wave transmission.

JP 2001-77878 A Japanese Patent Laid-Open No. 01-182784 JP 2005-64822 A

  An object of the present invention is to provide an excellent wireless data transmission system, information processing apparatus, information processing method, and computer program capable of suitably performing data transmission between information devices by wireless communication such as reflected wave communication. There is.

  A further object of the present invention is that data in a memory card mounted on a host device such as a digital camera or a mobile phone can be suitably transmitted to an external device such as a television receiver by reflected wave communication. A wireless data transmission system, an information processing apparatus, an information processing method, and a computer program are provided.

  A further object of the present invention is to provide an excellent wireless data transmission system capable of efficiently selecting desired data from data stored in a memory card and transmitting data from the memory card to an external device. An information processing apparatus, an information processing method, and a computer program are provided.

The present invention has been made in consideration of the above problems, and the first aspect of the present invention is as follows.
A memory card,
A host device for receiving the memory card;
An external device,
Wired communication means for performing wired communication between the memory card and the host device;
Wireless communication means for performing wireless data transmission between the memory card and the external device;
Infrared communication means for performing infrared communication between the host device and the external device,
The host device acquires a desired file name stored in the memory card via the wired communication means, and transmits the file name to the external device via the infrared communication means,
The external device reads a file corresponding to the file name received via the infrared communication means from the memory card via the wireless communication means;
This is a wireless data transmission system.

  However, “system” here refers to a logical collection of a plurality of devices (or functional modules that realize specific functions), and each device or functional module is in a single housing. It does not matter whether or not (hereinafter the same).

  The present invention relates to a wireless data transmission system that performs wireless data communication between information devices. In particular, the present invention stores image data taken with a digital camera or camera-equipped mobile phone in a memory card, and further reads out from the memory card. The present invention relates to a wireless data transmission system for transmitting received image data to an external device such as a display device or a printer. By applying reflected wave communication as the wireless communication means of the system, it is possible to reduce power consumption during data transmission, and to realize a reduction in size and cost of the wireless communication module.

  Here, when a large number of image files are stored in the memory card, it is necessary to specify which file should be transferred to the external device. A digital camera or mobile phone as a host device can perform a normal access operation to a memory card mounted via a wired interface and browse images. However, if the memory card is equipped with a wireless communication function for performing communication operations outside the control of the host device, the host device cannot directly specify an image to be transmitted with wireless data.

  Therefore, in the wireless data transmission system according to the present invention, after the file name of the data to be transmitted is notified from the host device to the external device by infrared communication, this time, the file selected by the external device from the memory card is read by reflected wave communication. I am doing so.

  On a host device such as a digital camera or a camera-equipped mobile phone, captured images are stored in a memory card and can be read out and displayed on a screen via a normal wired interface. The user can browse the displayed image and select an image to be transmitted. Many mobile phones are equipped with an infrared communication function as standard, so that the file name of the image selected by the user can be transferred to an external device by infrared communication. In the external device, when the file name is extracted from the received infrared command, the selected image can be acquired by making a read request to the wireless communication function mounted on the memory card.

  According to the present invention, a user can easily transfer a target image to an image output device such as a television simply by operating a mobile phone. Small images can also be sent directly from the mobile phone to the image output device, and the user can perform image transmission by the same method.

  Although infrared data communication is possible between the host device and the external device, the transfer rate is low (115.2 Kbps), which is sufficient for the communication of character information such as a file name, but for high-speed transmission of image data. It should be understood that it is impractical to apply.

A second aspect of the present invention is an information processing apparatus that can operate as an external device in the wireless data transmission system according to the first aspect of the present invention,
Wireless communication means for performing wireless data transmission;
An infrared communication means for performing infrared communication;
Communication control means for controlling a data reading operation by the wireless communication means according to the contents transmitted via the infrared communication means;
Data processing means for processing data received via the wireless communication means;
It is an information processing apparatus characterized by comprising.

  Here, the wireless communication means includes a means for transmitting an unmodulated carrier, and a reflection that has been modulated in accordance with transmission data read from the memory card and transmitted from a reflector mounted on the memory card. A means for reading a wave signal is provided, and data can be acquired from the memory card by reflected wave transmission.

  In this information processing apparatus, the infrared communication means obtains a desired file name stored in the memory card by infrared communication from a host device that accepts the memory card. The communication control means operates the wireless communication means so as to read out a file corresponding to the file name from the memory card. The data processing means performs processing such as decoding and signal conversion for outputting image data received via the wireless communication means, for example.

According to a third aspect of the present invention, there is provided a computer program described in a computer-readable format so as to execute processing for performing data acquisition operation on a computer system using infrared communication means and wireless communication means. A program for the computer system;
An infrared communication procedure for acquiring a desired file name stored in the memory card by infrared communication from a host device that accepts the memory card;
A wireless communication procedure for reading a file corresponding to the file name transmitted by the infrared communication procedure from the memory card by wireless data transmission;
A data processing procedure for processing data received by the wireless communication procedure;
Is a computer program characterized in that

  The computer program according to the third aspect of the present invention defines a computer program described in a computer-readable format so as to realize predetermined processing on a computer system. In other words, by installing the computer program according to the third aspect of the present invention in the computer system, a cooperative action is exhibited on the computer system, and the wireless data according to the first aspect of the present invention. It can operate as an external device in the transmission system.

  According to the present invention, it is possible to transmit data stored in a memory card mounted on a host device such as a digital camera or a mobile phone to an external device such as a television receiver by reflected wave communication. A data transmission system, an information processing apparatus, an information processing method, and a computer program can be provided.

  Further, according to the present invention, it is possible to efficiently select a desired data from the data stored in the memory card and transmit the data from the memory card to an external device. A system, an information processing apparatus, an information processing method, and a computer program can be provided.

  Other objects, features, and advantages of the present invention will become apparent from more detailed description based on embodiments of the present invention described later and the accompanying drawings.

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

  FIG. 1 schematically shows the configuration of a wireless transmission system according to an embodiment of the present invention. The system includes a host device 100 such as a camera-equipped mobile phone, a memory medium 101 with a wireless communication function accommodated in the host device 100, a television that displays and outputs image data read from the memory medium 101, and prints out. It comprises an external device 103 such as a printer.

  The wireless communication function installed in the memory medium 101 corresponds to a reflector in the reflected wave transmission system. On the other hand, a reflected wave signal transmitted from the reflector by the backscatter is transmitted to the external device 103 which is a counterpart of the wireless communication. A reflected wave reader for reading is provided. In addition, a mobile phone as the host device 100 includes an infrared communication unit 106 as a standard. In the present embodiment, since the infrared communication unit 105 is also mounted on the external device 103 side, the host device 100 and the external device 103 can perform infrared data communication.

  The memory medium 101 with the wireless communication function is accommodated in a memory slot provided in the mobile phone 100 and is connected to the mobile phone 100 main body via a wired communication interface (not shown). The wired communication interface between the memory medium 101 with the wireless communication function and the mobile phone 100 conforms to any standard interface specification such as MEMORYSTICK (registered trademark), PC card, USB, or the like.

  FIG. 2 shows an internal configuration of the memory medium 101 with a wireless communication function. As shown in the figure, the memory medium 101 with a wireless communication function includes an antenna 111, a wireless unit 115, a flash memory 114, a memory / communication control unit 113, and a connector unit 112.

  The flash memory 114 is a non-volatile semiconductor memory device that can be electrically erased and rewritten. For example, the flash memory 114 includes a memory chip such as an EPROM or an EEPROM, and is an entity of a memory space in the memory medium 110 with a wireless communication function. is there. The access operation to the flash memory 11 is controlled by the memory / communication control unit 113.

  The memory medium 101 with the wireless communication function is wired to the mobile phone 100 via the connector unit 112. The cellular phone 100 as the host device makes an access request to the flash memory 114 to the memory / communication control unit 113 via the connector unit 112, and writes a captured image to the flash memory 114 or the flash memory 114. Data such as images stored in is read out.

  In addition, since the memory medium 101 according to the present embodiment has a wireless communication function including the antenna 111 and the wireless unit 115, the memory / communication control unit 113 performs the wireless unit in addition to the memory access to the flash memory 114. The wireless communication operation at 115 is also controlled.

  The wireless unit 115 performs a wireless communication operation under the control of the memory / communication control unit 113 and can read a captured image from the flash memory 114 through the memory access control by the memory / communication control unit 113. Therefore, the external device 103 such as a television can access the flash memory 114 using wireless communication by making an access request to the memory / communication control unit 113 via the antenna 111 and the wireless unit 115.

  The radio unit 115 includes a transmission unit 116 and a reception unit 117, and performs radio transmission using a 2.4 GHz band called, for example, an ISM (Industrial, Scientific and Medical (industrial scientific medical) band). The transmission unit 116 encodes and modulates transmission data, converts it to an analog signal, up-converts it to a radio signal, and sends it out from the antenna 111 to the radio transmission path. The receiving unit 117 converts the radio signal received by the antenna 111 into a down converter and a digital signal, and further performs decoding / demodulation processing to analyze the received data.

  When a communication protocol such as Bluetooth communication or IEEE 802.11 is applied to the wireless unit 115, driver software for realizing the protocol operation is installed in the information device on the host device side such as the digital camera 101 in which the memory medium 110 is mounted. Need to be and cumbersome. On the other hand, in the present embodiment, the memory / communication control unit 113 performs an access operation to the flash memory 114 performed through the wireless communication operation by the wireless unit 115 from the digital camera 101 loaded with the memory medium 110. Independently (ie, outside the control by the digital camera 101 as the host device), the control is performed by the wireless reader 102 connected wirelessly. Therefore, the data read from the flash memory 114 can be wirelessly transmitted between the memory medium 110 and the wireless reader 102 without mounting a device driver for communication control on the digital camera 101 side.

  For example, when the wireless unit 115 applies the reflected wave transmission method to transmit wireless data, the reception unit 117 receives a radio wave (unmodulated carrier) transmitted from the wireless reader 102, and the transmission unit 116 reflects a reflected wave with respect to the received radio wave. A reflected wave signal modulated based on the transmission data is transmitted. The memory / communication control unit 113 may carry the data read from the flash memory 114 on the reflected wave, and such a communication operation can be realized without intervention of the host device.

  The memory media 101 with the wireless communication function is supplied with driving power from the digital camera 101 via the connector unit 112, and the memory / communication control unit 113 accesses the flash memory 114 using this supplied power. The wireless communication operation by the operation and the wireless unit 115 can be driven.

  FIG. 3 shows an internal configuration of the mobile phone 100. As shown in the figure, the mobile phone 100 includes an application processor 300, a bus 301, a wireless communication unit 302 and its antenna 303, a memory card interface 304, a display unit 102, and an operation unit 107. Yes. The camera unit 305 and the infrared communication unit 106 are general components as a mobile phone.

  The application processor 300 is composed of, for example, a CPU (Central Processing Unit) and a memory, and controls a general operation of the device 100 by developing and executing a predetermined program code in a memory space. Here, it is assumed that the application processor 300 is used not for lower layer control such as wireless communication but for higher-level application control. The application processor 300 is interconnected with each unit via a bus 301.

  The memory card interface 304 detachably accommodates the memory medium 101 with a wireless communication function, and stores, for example, captured image data in the memory medium 101 with a wireless communication function. The cellular phone 100 issues an access request to the flash memory 114 to the memory / communication control unit 113 in the memory medium 101 with the wireless communication function via the memory card interface 304, and the flash memory of the captured image It is possible to write data to 114 and read data such as images stored in the flash memory 114. The data read from the flash memory 114 can be transferred to the infrared communication unit 106 via the bus 301 and externally output as infrared data.

  The wireless communication unit 302 and its antenna 303 are functional modules for realizing a wireless communication function inherent to a mobile phone that performs circuit-switched data communication according to a mobile phone system such as a PDC. However, since the communication function by the mobile phone itself is not directly related to the gist of the present invention, it will not be described further here.

  The display unit 102 and the operation unit 107 realize a user interface function as an information terminal such as the mobile phone 100. The operation unit 107 includes a plurality of operation buttons, and can perform operations on the telephone such as input of a telephone number and input operation commands as an information terminal such as access to the memory medium 101. In addition to displaying a standby screen, the display unit 102 can display images taken by the camera unit 305, images read from the memory medium 101, and other data.

  FIG. 4 shows the configuration of the external device 103 that receives data by wireless communication from the memory medium 101 with the wireless communication function shown in FIG. In the illustrated example, the external device 103 is configured as an image output device such as a television that displays and outputs image data such as JPEG or MPEG acquired from the memory medium 101 on a screen.

  The external device 103 transmits a control signal to the memory medium 101 with a wireless communication function, and receives and demodulates a signal transmitted from the memory medium 101 with a wireless communication function. If the received data is image data such as JPEG or MPEG, the decoding process is required. For this reason, the external device 103 includes a 2.4 GHz band antenna 104, an antenna switch that alternatively connects the antenna 104 according to transmission / reception operations, or a circulator 401 that is an alternative thereto, a reception unit 402, and a transmission unit. 403, a baseband control unit 404, a JPEG decoder 405, and a display unit 407 that outputs a decoded JPEG image on the screen.

  The external device 103 includes an infrared communication unit 406 for performing infrared communication with the mobile phone 100, receives an infrared control signal, and gives an instruction to the baseband control unit 404. For example, the user uses the infrared communication to instruct the external device 103 from the mobile phone 100 to the file name of the image to be read from the memory medium 110 with the wireless communication function in the digital camera 101. The display output of the acquired image can be instructed.

  In order to transmit a control signal from the external device 103, a baseband signal subjected to primary modulation such as QPSK is given from the baseband control unit 404 to the transmission unit 403. The transmission unit 403 up-converts and amplifies this modulated signal to the 2.4 GHz band, and transmits it from the antenna 104 via the circulator 401.

  On the other hand, in the memory medium 101 with the wireless communication function described above, the memory / communication control unit 113 reads the transmission data from the flash memory 114 and converts it into a QPSK-modulated baseband signal. Then, the signal is converted into a 2.4 GHz band by the transmission unit 116 and transmitted from the antenna 111.

  On the external device 103 side, this modulated signal is received by the antenna / antenna 104, received by the receiving unit 402 via the circulator 401, and demodulated to the original data by the baseband control unit 404.

  The data demodulated by the baseband control unit 404 is converted from JPEG data to an analog AV signal (for example, NTSC signal) by the JPEG decoder unit 405, and the image can be viewed on the connected display unit 407.

  As a wireless communication interface for performing data transmission between the memory medium 101 with a wireless communication function and the external device 103, for example, a wireless LAN such as IEEE802.11 or a well-known wireless communication interface such as Bluetooth communication can be used. In the embodiment, a reflected wave transmission method is applied.

  The reflected wave transmission system includes a reflector that transmits data using a reflected wave subjected to modulation processing, and a reflected wave reader that reads data from the reflected wave from the reflector. In this case, the wireless unit in the memory medium 101 with the wireless communication function corresponds to a reflector, and a communication module including the antenna 104, the circulator 401, the receiving unit 402, the transmitting unit 403, and the baseband control unit 404 in the external device 103. Corresponds to a reflected wave reader.

  FIG. 5 shows a configuration of the wireless unit 115 on the side of the memory medium 110 with a wireless communication function configured as a reflector. The illustrated radio unit 115 includes an antenna 111, an antenna switch 510, an antenna load 511, a band pass filter 512, and an ASK detection unit 513. In the present embodiment, a 2.4 GHz band called ISM is used as the frequency of the radio wave.

  When the image data read from the flash memory 114 is received by the memory / communication control unit 113, the on / off operation of the antenna switch 510 connected to the antenna 111 is performed according to the bit image of the data. For example, the antenna switch 510 is turned on when the data is 1, and is turned off when the data is 0.

  As illustrated, when the antenna switch 510 is on, the antenna 111 is terminated with an antenna load 511 of 50Ω, and when the antenna switch 510 is off, the antenna 111 is open. In this operation, a radio wave (unmodulated carrier) arriving from an external device 103 (reflection wave reader) serving as a transfer destination behaves as a terminal when it is on and as a reflection when it is off. That is, the image data is basically backscattered as a reflected wave of a radio wave from a transfer destination caused by a change in antenna load impedance caused by an on / off operation of the antenna switch 410. The reflected wave signal from the wireless unit 115 is equivalent to an ASK modulated wave. However, in the reflected wave transmission system, it is also possible to apply a PSK or FSK modulation system in addition to ASK modulation (for example, refer to WO 2005/36767).

  The band-pass filter (BPF) 512 and the ASK detection unit 513 are used when receiving an ASK-modulated delivery confirmation signal from the transfer destination, but these two blocks are used for unidirectional transmission without confirming the delivery of the transmission. If there is, it becomes unnecessary. On the other hand, when delivery confirmation is performed, the control is performed by the memory / communication control unit 113.

  FIG. 6 shows a hardware configuration of the external device 103 when reflected wave transmission is applied as a wireless communication interface.

  The external device 103 is configured as a reflected wave reader for reading the reflected wave signal from the reflector. Since the image data from the memory module 101 with the wireless function is transmitted as a reflected wave, it is necessary to transmit an unmodulated carrier for generating the reflected wave from the external device 103. In this case, the reception unit 402 includes a quadrature detection unit 504 and an AGC amplifier 505, and the transmission unit 403 includes a mixer 508 and a power amplifier 507, and further includes a frequency synthesizer 509. The configurations and operations of the baseband control unit 404, the JPEG decoder 405, the infrared communication unit 406, and the display unit 407 are the same as described above, and thus the description thereof is omitted here.

  Transmission of an unmodulated carrier from the transmission unit 403 is realized by applying a DC voltage from the baseband control unit 404 to the mixer 508. The frequency of the non-modulated carrier to be transmitted is determined by the frequency of the frequency synthesizer controlled by the baseband control unit 404. In the present embodiment, a 2.4 GHz band called ISM is used. The unmodulated carrier output from the mixer 508 is amplified to a predetermined level by the power amplifier 507 and transmitted from the antenna 104 via the circulator 401.

  The reflected wave from the memory module 101 with the wireless communication function is the same as the frequency of the unmodulated carrier transmitted from the external device 103. This reflected wave is received by the antenna 104 and input to the receiving unit 402 described above via the circulator 201. Since the same local frequency as the transmission is input to the quadrature detection unit 504, the ASK modulated wave multiplied by the radio unit 115 appears at the output of the quadrature detection unit 504. However, since the received signal has a phase different from that of the local signal, a modulation signal corresponding to the phase difference appears in the I-axis signal and the Q-axis signal.

  In the AGC amplifier unit 505, the gain is controlled to an optimum value, and the output signal is passed to the baseband control unit 404. The baseband control unit 404 demodulates digital data from the I-axis and Q-axis signals, and correct data is decoded by the coder 405 using JPEG. Thereafter, the decoded data is further converted into an analog video signal, for example, and is output as video on the display unit 407.

  When confirming the delivery of data from the memory module 101 with the wireless communication function, the baseband control unit 404 gives an acknowledgment ACK (Acknowledgement) if the received packet data is correct, or a negative NACK if it is incorrect. (Negative Acknowledgment) digital data is transferred to the mixer 508 and subjected to ASK modulation. Whether the data is correct or not is determined by a CRC (Cyclic Redundancy Check) code added to the image data packet.

  FIG. 7 shows a control sequence for performing wireless data communication by reflected wave transmission between the wireless unit 115 of the memory module 101 with the wireless communication function shown in FIG. 5 and the external device 103 shown in FIG. . However, in the illustrated example, it is assumed that delivery confirmation is performed between both devices. Hereinafter, this control sequence will be described.

  First, the user sets the image playback mode using the operation unit 107 of the mobile phone 100 (201).

  Next, the cellular phone 100 accesses the attached memory medium 101 with the wireless function, reads out the target image data while specifying the block number and page number, and displays it on the display unit 102 (202). The user repeats the same operation from the operation unit 107 until an image to be transferred is found.

  When the user's display image is confirmed (203), the user executes infrared communication with the image output device 103 via the operation unit 107 (204), and transfers the file name of the target image data to the image output device 103. .

  Upon receiving the file name of the image data file to be displayed, the image output device 103 flashes via the antenna 104, the antenna 111 of the memory medium 101 with wireless communication function, the wireless unit 115, and the memory / communication control unit 113. Access the memory 114 and read out the target image data while designating the block number and page number of the file (205).

  As a result, the image output apparatus 103 can display the read image data (206).

  In this way, it is possible to transfer an image to be displayed to the image output device 103 by push-type communication by an operation from the mobile phone 100 side, and it is possible to save time and trouble when specifying a file name to be read by the image output device 103. It can be omitted.

  The user can transfer a target image to an image output device such as a television only by a simple operation of operating the mobile phone. In addition, an image having a small size can be directly sent from the mobile phone to the image output apparatus, and the image can be transmitted from the user by the same method.

  Infrared data communication is possible between the mobile phone and the image output device, but the transfer rate is low (115.2 Kbps), and although it is sufficient for communication of character information such as file names, high-speed transmission of image data It should be understood that it is unrealistic to apply to.

  The present invention has been described in detail above with reference to specific embodiments. However, it is obvious that those skilled in the art can make modifications and substitutions of the embodiment without departing from the gist of the present invention.

  According to the present invention, the external device can directly read out the corresponding file from the memory module with the wireless communication function by wireless communication by notifying the external device of the file name designated on the mobile phone by infrared communication. .

  In the present specification, the embodiment in which the reflected wave transmission is applied to the wireless communication interface between the external device and the memory module has been mainly described, but the gist of the present invention is not necessarily limited thereto. For example, the present invention can be similarly applied to a case where an external device and a memory module are connected using a wireless LAN represented by IEEE802.11 or Bluetooth communication.

  In short, the present invention has been disclosed in the form of exemplification, and the description of the present specification should not be interpreted in a limited manner. In order to determine the gist of the present invention, the claims should be taken into consideration.

FIG. 1 is a diagram schematically showing a configuration of a wireless transmission system according to an embodiment of the present invention. FIG. 2 is a diagram showing an internal configuration of the memory medium 101 with the wireless communication function. FIG. 3 is a diagram showing an internal configuration of the mobile phone 100. FIG. 4 is a diagram showing the configuration of the external device 103 that receives data by wireless communication from the memory medium 101 with the wireless communication function shown in FIG. FIG. 5 is a diagram showing the configuration of the wireless unit 115 on the memory media 110 side with a wireless communication function configured as a reflector. FIG. 6 is a diagram illustrating a hardware configuration of the external device 103 when reflected wave transmission is applied as a wireless communication interface. 7 is a diagram showing a control sequence for performing wireless data communication by reflected wave transmission between the wireless unit 115 of the memory module 101 with the wireless communication function shown in FIG. 5 and the external device 103 shown in FIG. is there.

Explanation of symbols

100: Host device (mobile phone)
101 ... Memory media with wireless communication function 103 ... External device (image output device)
DESCRIPTION OF SYMBOLS 104 ... Antenna 105, 106 ... Infrared communication part 111 ... Antenna 112 ... Connector part 113 ... Memory / communication control part 114 ... Flash memory 115 ... Radio | wireless part 300 ... Application processor 301 ... Bus 302 ... Wireless communication part 303 ... Antenna 304 ... Memory card interface 305 ... Camera part 401 ... Circulator 402 ... Reception part 403 ... Transmission part 404 ... Baseband control part 405 ... JPEG decoder 406 ... Infrared communication part 407 ... Display part 504 ... Quadrature detection part 505 ... AGC amplifier 507 ... Power amplifier 508 ... Mixer 509 ... Frequency synthesizer 510 ... Antenna switch 511 ... Antenna load 512 ... Band pass filter 513 ... ASK detector

Claims (11)

A memory card,
A host device for receiving the memory card;
An external device,
Wired communication means for performing wired communication between the memory card and the host device;
Wireless communication means for performing wireless data transmission between the memory card and the external device;
Infrared communication means for performing infrared communication between the host device and the external device,
The host device acquires a desired file name stored in the memory card via the wired communication means, and transmits the file name to the external device via the infrared communication means,
The external device reads a file corresponding to the file name received via the infrared communication means from the memory card via the wireless communication means;
A wireless data transmission system. The wireless communication means includes a reflector mounted on the memory card and a reflected wave reader mounted on the external device, and transmits radio waves from the reflected wave reader, and the reflector receives received radio waves. Transmitting a reflected wave signal subjected to modulation processing according to the transmission data read from the memory card with respect to the reflected wave, and the reflected wave reader reads data from the reflected wave signal from the reflector,
A wireless data transmission system. Wireless communication means for performing wireless data transmission;
An infrared communication means for performing infrared communication;
Communication control means for controlling a data reading operation by the wireless communication means according to the contents transmitted via the infrared communication means;
Data processing means for processing data received via the wireless communication means;
An information processing apparatus comprising: The infrared communication means obtains a desired file name stored in the memory card by infrared communication from a host device that accepts the memory card,
The communication control means operates the wireless communication means so as to read a file corresponding to the file name from the memory card;
The information processing apparatus according to claim 3. The wireless communication means includes
Means for transmitting an unmodulated carrier;
Means for reading a reflected wave signal that is sent from a reflector mounted on the memory card and modulated according to transmission data read from the memory card;
The information processing apparatus according to claim 4. The data processing means outputs an image of the image data received via the wireless communication means,
The information processing apparatus according to claim 3. An information processing method for performing an operation of acquiring data on an information processing device including an infrared communication unit and a wireless communication unit,
An infrared communication step for performing infrared communication;
A wireless communication step for performing wireless data transmission according to the contents transmitted in the infrared communication step;
A data processing step for processing the data received in the wireless communication step;
An information processing method comprising: In the infrared communication step, a desired file name stored in the memory card is acquired by infrared communication from a host device that accepts the memory card;
In the communication control step, a file corresponding to the file name is read from the memory card.
The information processing method according to claim 7. The wireless communication step includes
Transmitting an unmodulated carrier;
A step of reading a reflected wave signal that is transmitted from a reflector mounted on the memory card and modulated according to transmission data read from the memory card;
The information processing method according to claim 8. In the data processing step, the image data received in the wireless communication step is output as an image.
The information processing method according to claim 7. A computer program written in a computer-readable format so as to execute a process for performing data acquisition operation using an infrared communication means and a wireless communication means on a computer system, the computer system ,
An infrared communication procedure for acquiring a desired file name stored in the memory card by infrared communication from a host device that accepts the memory card;
A wireless communication procedure for reading a file corresponding to the file name transmitted by the infrared communication procedure from the memory card by wireless data transmission;
A data processing procedure for processing data received by the wireless communication procedure;
A computer program for executing

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