JP2007060239A - Information processor and processing method, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate data transfer through a USB interface. <P>SOLUTION: In a step S1, a video camera 1 detects the communication speed of the USB interface of a PC 3. In a step S2, the video camera 1 generates a format descriptor corresponding to the detected communication speed of the PC 3 and also generates a configuration descriptor by incorporating the format descriptor. In a step S3, the video camera 1 transmits the generated configuration descriptor to the PC 3. In a step S4, the camera 1 examines format information indicating the format of data that the PC 3 desires to receive and transmits the examined result to the PC 3. Then, in a step S6, the video camera 1 transmits the data to the PC 3 in the format indicated by the format information. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a communication apparatus and method, and a program, and more particularly, to a communication apparatus and method that can easily transfer data via a communication interface having a plurality of communication speeds, and a program.

  The number of video cameras equipped with USB (Universal Serial Bus) interface is increasing, but with this USB interface, communication speed has been increased, and now it is 1.5Mbps (low speed), 12Mbps (full speed), or 480Mbps. Data transfer at (high speed) is possible.

  In addition, various video streams such as MPEG (Moving Picture Experts Group) -2, MPEG-4, Motion JPEG (Joint Photographic Experts Group), DV (Digital Video), etc. can be used via USB. ) Standard-compliant USB interfaces are also popular.

  That is, if a USB interface having these functions is used, data such as moving images can be exchanged between the video camera and an external device (for example, a personal computer) at a high rate.

  By the way, for example, data transfer via a USB interface from a video camera (device in the USB video device class) to a personal computer (host in the USB video device class) is established by connecting both with a USB cable and establishing USB communication. However, if the communication speeds of the two USB interfaces do not match, a message indicating that is displayed on the video camera to prompt the user to switch the communication speed.

  For example, if the USB interface of both the video camera and personal computer is a high-speed compatible USB interface, but communication starts when the communication speed of the USB interface of the video camera is set to full speed (12 Mbps), "High-speed Please connect "message is displayed on the camcorder. Thus, the user needs to set the communication speed of the USB interface of the video camera to a high speed by operating, for example, an operation button of the video camera.

  The communication speed of the communication partner is detected after the USB cable is connected and USB communication is established. The shape of the USB cable and jack is no different between the high-speed USB interface and the full-speed USB interface. That is, it is not easy for the user to grasp the difference in communication speed between the two before starting communication (before connecting both).

  There is also a method of automatically adjusting the transmission amount from the state of the transmission line (see Patent Document 1). In this case, the transmission rate is adjusted by changing the frame rate, so the frame rate such as the DV standard is fixed. It is not applicable to the formatted format. That is, in that case, the user needs to switch the video camera to a mode in which another format matching the communication speed is output.

JP 09-074548 A

  As described above, conventionally, when data communication is performed using the USB interface, when the communication speeds of the communication partners are different, the user needs to switch the communication speed each time, which is inconvenient.

  In recent years, the media recorded by video cameras has become widespread, including DVD disks, hard disks, flash memories, and tape media. Some products that handle multiple media have been released. The stream data recorded on each medium is determined according to the characteristics and use of the medium. In the USB video device class, functions that depend on the type of stream and common functions that do not depend on the type of stream are defined. However, developing common functions for each model also has a problem of costly development.

  The present invention has been made in view of such a situation, for example, and can easily perform data communication using a USB interface even when communication speeds of communication partners are different. .

  One aspect of the present invention is a detection unit that detects a communication speed of the other communication device, and the data is transferred to the other communication device in the predetermined format according to the communication speed detected by the detection unit. It is a communication apparatus provided with the communication control means to give / receive.

  The communication control means may include a USB interface.

  The USB interface may be a high speed compatible USB interface.

  The detecting means can detect the communication speed after USB communication between the communication device and the other communication device is established.

  For each communication speed at which data can be exchanged, the apparatus further comprises holding means for holding information relating to the format of the data that can be exchanged at the communication speed, and the communication control means uses the detection means based on the information held by the holding means. A format corresponding to the communication speed detected by the communication method can be detected, and the data can be exchanged with the other communication device in the detected format.

  The information held in the holding means can be changed.

  The communication control means can transmit the data to the other communication transmission in a format corresponding to the communication speed detected by the detection means.

  The data can be recorded on a recording medium.

  When the data is encoded with a predetermined codec, the communication control means decodes the data, encodes with a codec corresponding to a format according to the communication speed, and encodes the encoded data, It can transmit to the said other transmission apparatus.

  Recording means for recording the data received by the communication control means on a recording medium can be further provided.

  When the data is encoded with a predetermined codec, the recording means decodes the data, encodes with a codec corresponding to a format according to the recording medium, and encodes the encoded data with the codec It can be recorded on a recording medium.

  One aspect of the present invention is a detection step of detecting a communication speed of the other communication device, and the data is transferred to the other communication in the predetermined format corresponding to the communication speed detected in the processing of the detection step. A communication method including a communication control step for exchanging with an apparatus.

  One aspect of the present invention is a detection step of detecting a communication speed of the other communication device, and the data is transferred to the other communication in the predetermined format corresponding to the communication speed detected in the processing of the detection step. A program that causes a computer to execute processing including a communication control step that communicates with an apparatus.

  As described above, according to one aspect of the present invention, data communication using a USB interface can be easily performed.

  Embodiments of the present invention will be described below. Correspondences between constituent elements described in the claims and specific examples in the embodiments of the present invention are exemplified as follows. This description is for confirming that the embodiment supporting the invention described in the claims is described in the embodiment of the invention. Therefore, although there are embodiments that are described in the embodiment of the invention but are not described here as corresponding to the constituent elements, It does not mean that it does not correspond to the configuration requirement. Conversely, even if an embodiment is described here as corresponding to a configuration requirement, that means that the embodiment does not correspond to a configuration requirement other than the configuration requirement. It's not something to do.

  The communication device according to one aspect of the present invention includes a detection unit (for example, the CPU 11 and the USB interface 25 in FIG. 2) that detects a communication speed of the other communication device, and the communication detected by the detection unit. Communication control means (for example, the CPU 11 and the USB interface 25 in FIG. 2) that exchanges the data with the other communication device in the predetermined format corresponding to the speed is provided.

  Secondly, in the communication device according to one aspect of the present invention, the communication control means includes a USB interface (for example, the USB interface 25 in FIG. 2).

  Thirdly, in the communication device according to one aspect of the present invention, the USB interface is a high-speed compatible USB interface (for example, the USB interface 25 in FIG. 2).

  Fourthly, in the communication device according to one aspect of the present invention, the detection unit detects the communication speed after the USB communication between the communication device and the other communication device is established (for example, FIG. 4). Step S1).

  Fifth, the communication apparatus according to one aspect of the present invention further includes a holding unit (for example, the database 14A in FIG. 2) that holds information on the format of data that can be transmitted / received at each communication speed at which data can be transmitted / received The communication control means detects a format corresponding to the communication speed detected by the detection means from the information held by the holding means, and the data in the detected format is sent to the other data Exchange with communication devices.

  Sixthly, in the communication device according to one aspect of the present invention, the information held in the holding unit can be changed.

  Seventhly, in the communication device according to one aspect of the present invention, the communication control unit transmits the data to the other communication transmission in a format according to the communication speed detected by the detection unit (for example, , Step S6 in FIG.

  Eighthly, in the communication device according to one aspect of the present invention, the data is recorded in a recording medium (for example, the recording medium 16 in FIG. 2).

  Ninthly, in the communication device according to one aspect of the present invention, when the data is encoded with a predetermined codec, the communication control unit decodes the data and supports a format according to the communication speed. The coded data is transmitted to the other transmission device (for example, the codec unit 24 in FIG. 2).

  Tenthly, the communication apparatus according to one aspect of the present invention further includes recording means (for example, the CPU 11 and the recording medium 16 in FIG. 2) for recording the data received by the communication control means on a recording medium.

  Eleventhly, in the communication device according to one aspect of the present invention, when the data is encoded with a predetermined codec, the recording unit decodes the data and corresponds to a format according to the recording medium. The data is encoded by a codec, and the encoded data is recorded on the recording medium (for example, the codec unit 24 in FIG. 2).

  A communication method and a program according to an aspect of the present invention are detected by a detection step (for example, step S1 in FIG. 4 and step S31 in FIG. 8) for detecting a communication speed of the other communication device, and processing in the detection step. Communication control steps (for example, steps S2 to S6 in FIG. 4 and steps S32 to S36 in FIG. 8) for exchanging the data with the other communication devices in the predetermined format corresponding to the communication speed. Including.

  FIG. 1 shows an example of use of a video camera 1 and a personal computer 3 to which the present invention is applied.

  The video camera 1 and the PC 3 have, for example, a USB interface (USB interface 25 in FIG. 2 and USB interface 141 in FIG. 3) compliant with the USB video device class standard, and exchange data via the USB cable 2. .

  In this example, the USB interface of the video camera 1 and PC 3 are both high-speed compatible USB interfaces (1.5 Mbps (low speed), 12 Mbps (full speed), or 480 Mbps (high speed)). ).

  FIG. 2 shows a configuration example of the video camera 1.

  A CPU (Central Processing Unit) 11 executes various processes according to a program stored in a ROM (Read Only Memory) 12. A RAM (Random Access Memory) 13 appropriately stores data necessary for the CPU 11 to execute various processes.

  For each communication speed that can be handled by the video camera 1 (USB interface 25), the storage unit 14 stores a database 14A (described later) in which information on the type (format) of data that can be handled at the communication speed is set.

  The drive 15 stores image data or the like supplied from the CPU 11 in a recording medium 16 composed of a tape, a magnetic disk, an optical disk, a magneto-optical disk, a hard disk, or a semiconductor memory, or an image recorded on the recording medium 16. Data and the like are read and supplied to the CPU 11.

  Further, when a program that operates on the video camera 1 is recorded on the recording medium 16, the drive 15 can read the program from the recording medium 16 and cause the CPU 11 to execute it.

  The camera unit 21 includes a lens, a CCD (Charged Coupled Device), and the like, and supplies image data obtained as a result of imaging to the signal processing unit 23. The voice input unit 22 is composed of a microphone or the like, and supplies voice data obtained as a result of sound collection to the signal processing unit 23.

  The signal processing unit 23 performs image processing such as gamma conversion, color space conversion, and white balance on the image data supplied from the camera unit 21, and performs predetermined processing on the audio data supplied from the audio input unit 22. Audio processing is performed, and the resulting image data and audio data (hereinafter referred to as AV data when they do not need to be individually distinguished) are supplied to the CPU 11.

  The codec unit 24-1 performs codec processing conforming to the MPEG2 standard on the AV data supplied from the CPU 11.

  The codec unit 24-2 performs codec processing conforming to the DV standard on the AV data supplied from the CPU 11.

  The codec unit 24-3 performs codec processing conforming to the MEPG1 standard on the AV data supplied from the CPU 11.

  In the example of FIG. 2, three codec portions 24 are provided, but there is no need for a plurality of codec portions 24.

  The USB interface 25 is a USB interface that conforms to the USB video device class standard corresponding to high speed, controls the USB protocol, and communicates with the PC 3 via the USB cable 2 connected to the USB cable connection terminal 26. .

  The display control unit 27 converts the image data (YUV digital image data or the like) supplied from the CPU 11 into an RGB signal, and supplies the RGB signal to the display unit 28 configured by an LCD or the like for display.

  The audio output unit 29 outputs the audio data supplied from the CPU 11 via the speaker 30.

  The operation unit 31 includes a shooting start button and various setting buttons, and notifies the CPU 11 of the operation content by the user.

  FIG. 3 shows a configuration example of the PC 3.

  The CPU 111 executes various processes according to a program stored in the ROM 112 or a program loaded from the hard disk 114 to the RAM 113. The RAM 113 also appropriately stores data necessary for the CPU 111 to execute various processes.

  The CPU 111, the ROM 112, and the RAM 113 are connected to each other via a bus 115. An input / output interface 116 and a USB interface 141 are also connected to the bus 115.

  The input / output interface 116 includes an input unit 118 including a keyboard, a mouse, and an input terminal, a display including a CRT (Cathode Ray Tube) and an LCD (Liquid Crystal display), an output terminal, and an output unit 117 including a speaker. A communication unit 119 including a terminal adapter, an ADSL (Asymmetric Digital Subscriber Line) modem, a LAN (Local Area Network) card, and the like is connected. The communication unit 119 performs communication processing via various networks such as the Internet.

  A drive 120 is also connected to the input / output interface 116, a magnetic disk (including a floppy disk) 131, an optical disk (including a CD-ROM (Compact Disk-Read Only Memory) DVD Digital Versatile Disk)) 132, a magneto-optical disk. 133 (including MD (Mini Disk)) or a removable medium (recording medium) 134 such as a semiconductor memory is appropriately mounted, and a computer program read from the medium is installed in the hard disk 114 as necessary.

  In this example, the USB interface 141 is a USB interface conforming to the video device class standard corresponding to full speed, and communicates with the video camera 1 via the USB cable 2 connected to the USB cable connection terminal 142. Control.

  Next, both operations when data is transferred from the video camera 1 (slave) to the PC 3 (host) will be described with reference to the flowchart of FIG.

  When the video camera 1 and the PC 3 are connected with the USB cable 2, the USB interface 25 of the video camera 1 detects the communication speed of the USB interface 141 of the PC 3 and notifies the CPU 11 in step S1.

  In this example, it is detected that the communication speed of the PC 3 is 480 Mbps (high speed).

  The communication speed is determined by, for example, a pull-up resistor at the upstream port of the USB cable connection terminal 142 of the PC 3.

  Here, the CPU 11 of the video camera 1 can also control the display control unit 27 to display the detected communication speed of the PC 3 and present it to the user.

  In step S2, the CPU 11 of the video camera 1 generates a format descriptor according to the communication speed of the PC 3 detected in step S1, and generates a configuration descriptor by incorporating the format descriptor. Details of this processing are shown in FIG.

  In step S21, the CPU 11 of the video camera 1 determines whether or not the information corresponding to the communication speed detected in step S1 is set in the database 14A. If it is determined that the information is set, the process proceeds to step S22. move on.

  In this example, the USB interface 25 of the video camera 1 is a USB interface compatible with high speed. The video camera 1 has a codec unit 24-1 that performs codec processing in accordance with the MPEG2 standard, and conforms to the DV standard. A codec unit 24-2 that performs codec processing and a codec unit 24-3 that performs codec processing conforming to the MPEG1 standard are mounted. Therefore, in the database 14A, information (setting information and format descriptor) regarding the format of data that can be exchanged at each communication speed corresponding to 1.5 Mbps (low speed), 12 Mbps (full speed), and 480 Mbps (high speed). Is set.

  FIG. 6 shows setting information (bit rate, frame size, etc.) of MEPG1 as a data format that can be exchanged at full speed, its format descriptor, and MPEG2 and DV as formats of data that can be exchanged at high speed. Configuration information and format descriptors are shown.

  The contents of the database 14A can be changed in response to a user operation or a request from the PC 3. Moreover, what can be changed and what cannot be changed can also be provided separately.

  Returning to FIG. 5, in step S22, the CPU 11 of the video camera 1 reads the setting information and format descriptor of the format corresponding to the communication speed detected in step S1 in the database 14A.

  In this example, setting information and format descriptors of “MEPG2” and “DV” set in correspondence with “High speed” are read (FIG. 6).

  In step S23, the CPU 11 of the video camera 1 generates an input header descriptor from the format descriptor read out in step S22, and incorporates the generated input descriptor and the read format descriptor into the configuration descriptor to generate the configuration descriptor. Generate.

  In this example, as shown in FIG. 7, the input header descriptor generated from the MPEG2 format descriptor and the DV format descriptor, and the MPEG2 and DV format descriptors are incorporated into the configuration descriptor.

  The input header descriptor is a header descriptor generated when data is transferred to the host side. If there are N format descriptors (two in the example of FIG. 7), “bNumFormats” (in the figure) In the example shown in FIG. 7, N parameters (0x02 in the example of FIG. 7) are set in the parameter with the arrow A, and N “bmaContorols” (in the example of FIG. 7, “bmaContorols (1)”). And "bmaContorols (2)" (parameters with arrows B and C in the figure).

  In each “bmaContorols”, data (setting information or the like) indicating the control content for the format corresponding to the format descriptor is set as necessary.

  In this way, a configuration descriptor is generated.

  Returning to FIG. 4, when the connection with the video camera 1 is established, the CPU 111 of the PC 3 requests the video camera 1 to provide a descriptor via the USB interface 141 in step S <b> 11.

  Upon receiving this request, the CPU 11 of the video camera 1 controls the USB interface 25 to transmit the configuration descriptor generated in step S2 to the PC 3 in step S3.

  When the configuration descriptor is transmitted from the video camera 1, the USB interface 141 of the PC 3 receives it in step S12, and recognizes that the video camera 1 has a USB interface conforming to the USB video device class standard. Then, the video camera 1 is requested to communicate according to the USB video device class standard. That is, after this, communication conforming to the USB video device class standard is performed.

  Next, in step S13, the CPU 111 of the PC 3 refers to the format descriptor (FIG. 7) incorporated in the configuration descriptor received in step S11, and the format of data to be received and other conditions (for example, MPEG1 When receiving the data, the frame rate, the image size, the image quality, etc. (hereinafter, these information are collectively referred to as format information) are determined, and the USB interface 141 is controlled to control the video camera 1. To send to.

  In this case, it is assumed that format information corresponding to MPEG2 is transmitted to the video camera 1.

  When the format information is transmitted from the PC 3, the CPU 11 of the video camera 1 receives it via the USB interface 25 in step S4 and examines the format information. In step S5, the examination result is The data is transmitted to the PC 3 via the USB interface 25.

  In the case of the present example, the format information transmitted from the PC 3 indicates that the data to be received is MEPG2 data. Therefore, the data to be transferred is compressed according to the MPEG2 standard or compressed according to the MPEG2 standard. Even if not, it is considered whether the compression currently performed using the codec section 24 can be expanded and MPEG2 compression can be performed.

  In this way, it is examined whether data compressed by the MPEG2 standard can be transferred (transferred at a high speed).

  When the examination result is transmitted from the video camera 1, the CPU 111 of the PC 3 receives it via the USB interface 141 in step S14, and makes a response according to the examination result.

  For example, if the examination result indicates that data transfer according to the format information transmitted in step S13 is possible, the video camera 1 is requested to transfer data according to the conditions.

  If the examination result indicates that data transfer according to the format information cannot be performed, other format information is transmitted to the video camera 1.

  In the case of the example of FIG. 4, it is assumed that data transfer according to the format information transmitted in step S13 is possible, and in step S14, the video camera 1 is requested to transfer data according to the conditions.

  When data transfer is requested from the PC 3, the CPU 11 of the video camera 1 performs processing according to the format information from the PC 3 in step S6, and controls the USB interface 25 to transfer the resulting data. Let it begin.

  In this example, MPEG2 compressed data is transferred at a high speed. For example, when the data to be transferred is DV compressed, the result obtained after the DV decompression processing is performed by the codec unit 24-2. The coded data is subjected to MPEG2 compression processing by the codec unit 24-1, and the resulting data is transferred to the PC 3 at a high speed via the USB interface 25.

  When data transfer is started from the video camera 1, the CPU 111 of the PC 3 controls the USB interface 141 in step S15 to start reception thereof.

  Data transfer from the video camera 1 to the PC 3 is performed as described above.

  Next, both operations when the video camera 1 receives data transfer from the PC 3 will be described with reference to the flowchart of FIG.

  In steps S31 to S33 and steps S41 to S43, the same processing as in steps S1 to S3 and steps S11 to S13 in FIG. In the configuration descriptor generated in step S32, in this case, a descriptor basically similar to the input descriptor is incorporated as an output header descriptor.

  In step S34, the CPU 11 of the video camera 1 receives the format information transmitted from the PC 3 via the USB interface 25 and examines the format information. In step S35, the CPU 11 of the video camera 1 sends the examination result to the USB interface 25. Is transmitted to PC3.

  For example, when the format information transmitted from the PC 3 indicates that the data to be transferred is MEPG2 data, whether or not the recording medium 16 for recording the MEPG2 compressed data is installed, or such a recording medium 16 is installed. A recording medium 16 capable of recording data in other formats is loaded even if it is not, and MPEG2 compression is expanded using the codec section 24 and compressed by a compression method corresponding to the recording medium 16. It is considered whether it is possible.

  In this way, it is examined whether data compressed by the MPEG2 standard can be received.

  When the examination result is transmitted from the video camera 1, the CPU 111 of the PC 3 receives it through the USB interface 141 in step S44 and makes a response according to the examination result.

  For example, when the examination result indicates that data reception according to the format information transmitted in step S43 is possible, the video camera 1 is requested to receive data according to the conditions.

  When the examination result indicates that data reception according to the format information cannot be performed, other format information is transmitted to the video camera 1.

  In the case of the example of FIG. 8, it is assumed that data reception according to the format information transmitted in step S43 is possible. In step S44, the video camera 1 is requested to receive data according to the conditions.

  Next, in step S45, the CPU 111 of the PC 3 starts transferring predetermined data in the format indicated by the format information transmitted in step S43, for example.

  When the data transfer from the PC 3 is started, the CPU 11 of the video camera 1 controls the USB interface 25 to start reception in step S36. The CPU 11 records the received data on the recording medium 16 as it is or after converting the format as described above.

  Data reception of the video camera 1 is performed as described above.

  As described above, since the format is determined with reference to the database 14A when the communication speed is determined, it is not necessary for the user to switch the mode later, and the operability in the data transfer of the video camera 1 can be improved. .

  In addition, since the USB interface 25 (USB video device class control application) and the database 14A can be configured separately, the same applies to devices corresponding to different formats by simply changing the contents of the database 14A. The present invention can be applied to.

  The series of processes described above can be executed by dedicated hardware or can be executed by software.

  In the present specification, the steps described in the flowcharts are executed in parallel or individually even if they are not necessarily processed in time series, as well as processes performed in time series in the described order. It also includes processing.

It is a figure which shows the usage example of the video camera 1 and PC3 to which this invention is applied. It is a block diagram which shows the structural example of the video camera 1 of FIG. It is a block diagram which shows the structural example of PC3 of FIG. 6 is a flowchart for explaining the operation of both when data is transferred from the video camera 1 to the PC 3. It is a flowchart which shows the detail of the process of step S2 of FIG. It is a figure which shows the example of the database 14A of FIG. It is a figure which shows the example of the format descriptor incorporated in a configuration descriptor. 2 is a flowchart for explaining the operation of the video camera 1 in FIG. 1 when receiving data transfer from a PC 3.

Explanation of symbols

  1 video camera, 2 USB cable, 3 PC, 11 CPU, 24 codec, 25 USB interface, 141 USB interface

Claims (13)

In a communication device that exchanges data with other communication devices in a predetermined format according to a predetermined communication speed,
Detecting means for detecting a communication speed of the other communication device;
A communication apparatus comprising: communication control means for exchanging the data with the other communication apparatus in the predetermined format corresponding to the communication speed detected by the detection means. The communication apparatus according to claim 1, wherein the communication control unit includes a USB interface. The communication device according to claim 2, wherein the USB interface is a high-speed compatible USB interface. The communication device according to claim 2, wherein the detection unit detects the communication speed after USB communication between the communication device and the other communication device is established. For each communication speed at which data can be exchanged, the information processing apparatus further comprises holding means for holding information relating to the format of data that can be exchanged at the communication speed,
The communication control means detects a format corresponding to the communication speed detected by the detection means from the information held by the holding means, and the data in the detected format is sent to the other communication device. The communication device according to claim 1. The communication apparatus according to claim 5, wherein the information held in the holding unit can be changed. The communication apparatus according to claim 1, wherein the communication control unit transmits the data to the other communication transmission in a format corresponding to the communication speed detected by the detection unit. The communication apparatus according to claim 7, wherein the data is recorded on a recording medium. When the data is encoded with a predetermined codec, the communication control means decodes the data, encodes with a codec corresponding to a format according to the communication speed, and encodes the encoded data, The communication apparatus according to claim 7, wherein the communication apparatus transmits to the other transmission apparatus. The communication apparatus according to claim 1, further comprising: a recording unit that records the data received by the communication control unit on a recording medium. When the data is encoded with a predetermined codec, the recording means decodes the data, encodes with a codec corresponding to a format according to the recording medium, and encodes the encoded data with the codec The communication apparatus according to claim 10, wherein recording is performed on a recording medium. In a communication method for exchanging data with another communication device in a predetermined format corresponding to a predetermined communication speed,
A detection step of detecting a communication speed of the other communication device;
A communication method comprising: a communication control step of exchanging the data with the other communication device in the predetermined format corresponding to the communication speed detected in the processing of the detection step. In a program for controlling communication for exchanging data with other communication devices in a predetermined format corresponding to a predetermined communication speed,
A detection step of detecting a communication speed of the other communication device;
A program that causes a computer to execute processing including a communication control step of exchanging the data with the other communication device in the predetermined format according to the communication speed detected in the processing of the detection step.

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