JP2010282604A - Software update system, electronic apparatus, and software update method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To quickly and simply perform update of software, even for multiple electronic apparatus which are not provided with any broadcast receiving function or network connecting function, in a system in which the multiple electronic apparatus are connected through a communication interface such as HDM. <P>SOLUTION: In a software update system, a recorder 1 and a TV 8 and an AV amplifier 2 are HDMI connected. The recorder 1 includes: a tuner 11 for acquiring update data for updating the software of the AV amplifier 2; and an HDMI transmission part 19 for transmitting the acquired update data through a TV8 on a voice transmission line with HDMI specifications to the AV amplifier 2. The AV amplifier 2 includes: a controller 21 for updating the software of the AV amplifier 2 with the update data transmitted from the recorder 1 through the TV 8. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a software update system for updating software of an electronic device having a communication interface such as HDMI (High Definition Multimedia Interface), an electronic device constituting the system, and a software update method.

  Usually, update data (hereinafter referred to as update data) for updating software such as firmware of an electronic device can be downloaded and acquired from a communication network or a broadcast network. For example, when an Internet connection function is provided like a PC (personal computer), update data can be downloaded from a Web site on the Internet, and its own software can be updated automatically or manually. In the case of a television device, it is possible to receive a broadcast wave including update data and update its own software. Further, some recent television apparatuses have both a broadcast receiving function and an Internet connection function, so that software can be updated without imposing a burden on the user.

  Conventionally, as a technology related to software update in an electronic device, for example, Patent Literature 1 discloses a broadcast wave download system that updates software of a home appliance such as a hard disk recorder or a refrigerator under the control of a broadcast receiver. Are listed. According to this, the broadcast receiver that has received the broadcast wave data determines whether or not device data (data for updating the software of the device) regarding the owned device under its control exists in the broadcast wave data. When the device data exists, the device data is transmitted to the corresponding owned device via the HDMI cable, and the software of the device such as the refrigerator is updated.

  Patent Document 2 describes an information update system that uses a command defined in the bidirectional cable standard to easily upgrade a display device control program. The playback device constituting this system reads an update file from the optical disc, creates a vendor command indicating the content of the update file based on the HDMI standard, and transmits the created vendor command to the television from the HDMI port. On the TV side, its own firmware is upgraded by a vendor command.

  According to the techniques described in these Patent Documents 1 and 2, update data is transmitted from one HDMI-connected device to the other device, and the other device updates software based on this update data. Can be done. Therefore, even when the other device does not have a broadcast reception function or a network connection function, the software can be easily updated.

JP 2008-236031 A JP 2008-165698 A

  However, when the update data is transmitted using a bidirectional CEC (Consumer Electronics Control) line in the HDMI standard, there are the following problems.

  If the data capacity of the electronic device software to be updated is about 1 MB, the physical transmission rate of the CEC line is as low as about 300 bps, so the time required for data transmission is 8,000,000 (bits) / 300 ( bps) = 26,667 (seconds) ≈7 hours 24 minutes. Actual data transmission requires handshaking (flow control), and due to this redundancy, the actual data transmission time is considered to be about twice as long as the above time.

  When trying to update software for an electronic device that does not have a broadcast reception function or network connection function, it is desirable that data transmission can be completed within 10 minutes at the latest in consideration of practicality. However, when a CEC line is used for data transmission. Takes time as described above and is not practical. In addition, although it is possible to update using a recording medium in which update data is recorded, this method requires that the user obtain a recording medium from the manufacturer or the like each time the update is performed, and manually update the software. There is a problem that the burden of.

  The present invention has been made in view of the above circumstances, and is an electronic device that does not have a broadcast reception function or a network connection function in a system in which a plurality of electronic devices are connected by a communication interface such as HDMI. Another object is to make it possible to update software quickly and easily.

  In order to solve the above-described problem, the first technical means is configured such that the first electronic device and the display device are connected via the communication interface, and the display device and the second electronic device are connected. In the software update system, the first electronic device includes update data acquisition means for acquiring update data for updating software of the second electronic device, and the acquired update data is transmitted to the voice of the communication interface. Update data transmission means for transmitting to the second electronic device via the display device via a transmission line, and the second electronic device transmits software of the second electronic device from the first electronic device. Software update means for updating with update data transmitted via the display device is provided.

  According to a second technical means, in the first technical means, the first electronic device includes identification information storage means for storing identification information of the second electronic device and software version information. If the identification information of the second electronic device and the software version information are included, and the software version information is newer than the version information stored in the identification information storage means, the software of the second electronic device is A selection screen signal for allowing the user to select whether or not to update is transmitted to the display device through the video transmission line of the communication interface, and the user selects to update the software on the selection screen displayed on the display device. When the first electronic device transmits the update data to the second electronic device, the display device and the 2 of the electronic device is in a direction of the update data is transmitted from the display device to the second electronic device is obtained by and switches the transmission direction of the audio transmission line.

  According to a third technical means, in the second technical means, the update data transmission means transmits the update data before transmitting the update data to the second electronic device via the voice transmission line. A command for notification is transmitted to the display device and the second electronic device, and the display device and the second electronic device switch a transmission direction of the audio transmission line in response to reception of the command. It is characterized by.

  According to a fourth technical means, in the first technical means, the first electronic device comprises identification information storage means for storing identification information of the second electronic device and software version information. The update data transmission means includes the update information when the second electronic device identification information and software version information are included, and the software version information is newer than the version information stored in the identification information storage means. Data is transmitted to the second electronic device through the voice transmission line.

  According to a fifth technical means, in any one of the second to fourth technical means, the first electronic device transmits a predetermined command to the second electronic device, whereby the second electronic device. The identification information of the second electronic device and the software version information are received from the device and stored in the identification information storage means.

  Sixth technical means is any one of the first, second, and fourth technical means, wherein the update data transmission means transmits the update data to the second electronic device via the voice transmission line. In addition, a command for notifying that the update data is to be transmitted is transmitted to the second electronic device.

  A seventh technical means is the sixth technical means, wherein the second electronic device comprises audio output means for outputting an audio signal transmitted from the first electronic device to a built-in speaker or an external speaker, The audio output by the audio output means is muted from the time when the command is received until the update data transmission processing is completed.

  According to an eighth technical means, in any one of the first to seventh technical means, the update data includes update data of the first electronic device and one or more connectable to the first electronic device. The update data of the second electronic device is combined.

  A ninth technical means is the first technical means according to any one of the first to eighth technical means, wherein the first electronic device includes update data storage means for storing update data acquired by the update data acquisition means, The update data in the update data storage unit is deleted after the update data transmission unit completes the transmission of the update data to the second electronic device.

  According to a tenth technical means, in any one of the first to ninth technical means, the second electronic device includes update data memory means for storing update data transmitted from the first electronic device. The update data in the update data memory means is deleted after the software update by the software update means is completed.

  The eleventh technical means is any one of the first to tenth technical means, characterized in that the update data transmission means transmits dummy data added at the head of the update data. .

  According to a twelfth technical means, in the eleventh technical means, the data format of the dummy data is different from the data format of the update data.

  A thirteenth technical means is characterized in that, in the eleventh technical means, fixed data including identification information of the second electronic device is added to the header of the update data.

  In a fourteenth technical means according to the thirteenth technical means, the second electronic device detects a header of the update data from transmission data including dummy data and update data transmitted from the first electronic device. An update provided with a header detection means and update data extraction means for extracting update data of the second electronic device based on the detected fixed data of the header, and the update provided by the second electronic device with the extracted update data It is characterized in that it is stored in a data memory means.

  A fifteenth technical means is the thirteenth technical means, wherein the second electronic device temporarily stores transmission data including dummy data and update data transmitted from the first electronic device; Header detection means for detecting a header of the update data from transmission data stored in the buffer memory; and update data extraction means for extracting update data of the second electronic device based on the fixed data of the detected header And the extracted update data is stored in update data memory means provided in the second electronic device.

  According to a sixteenth technical means, in any one of the first to fifteenth technical means, the update data acquisition means is a reception means for receiving a broadcast wave including update data.

  In a seventeenth technical means according to any one of the first to fifteenth technical means, the update data acquisition means is connected to a server device storing the update data via a network, and the update data is received from the server device. It is a network connection means for downloading.

  In an eighteenth technical means according to any one of the first to seventeenth technical means, the communication interface is HDMI, the first electronic device is a source device, and the second electronic device is a repeater device. It is characterized by that.

  A nineteenth technical means is any one of the first to seventeenth technical means, wherein the communication interface is IEEE1394.

  A twentieth technical means is an electronic device constituting the software update system according to any one of the first to nineteenth technical means, and the electronic device is update data for updating software of another electronic device. Update data acquisition means for acquiring the update data, and update data transmission means for transmitting the acquired update data to the other electronic device via a voice transmission line of the communication interface.

  The twenty-first technical means is a software update method by a software update system in which the first electronic device and the display device are connected via the communication interface, and the display device and the second electronic device are connected. The first electronic device acquires update data for updating the software of the second electronic device, and the acquired update data is transmitted via the display device via the audio transmission line of the communication interface. And transmitting the software of the second electronic device from the first electronic device via the display device to the second electronic device. This is characterized in that the step of updating is provided.

  According to the present invention, in a system in which a plurality of electronic devices are connected by a communication interface such as HDMI, update data is transmitted using an audio transmission line of the communication interface, thereby having a broadcast reception function, a network connection function, and the like. Even if there is no electronic device, software can be updated quickly and easily.

It is a figure which shows an example of the software update system which concerns on the reference example of this invention. FIG. 2 is a block diagram illustrating a configuration example of a recorder and an AV amplifier illustrated in FIG. 1. It is a figure for demonstrating an example of the update data acquisition method of AV amplifier by a recorder. It is a figure for demonstrating the other example of the update data acquisition method of AV amplifier by a recorder. It is a flowchart for demonstrating the operation example of the recorder in the software update system shown in FIG. It is a flowchart for demonstrating the operation example of AV amplifier in the software update system shown in FIG. It is a figure for demonstrating an example of the command flow by the software update system shown in FIG. It is a figure which shows an example of the update data to which dummy data was added. It is a figure which shows an example of the format of the update data transmitted to AV amplifier from a recorder. It is a block diagram which shows the specific structural example for extracting update data in AV amplifier. FIG. 10 is a block diagram illustrating another specific configuration example for extracting update data in an AV amplifier. It is a figure which shows an example of the software update system which concerns on one Embodiment of this invention. It is a block diagram which shows the structural example of the recorder shown in FIG. 12, AV amplifier, and TV. It is a flowchart for demonstrating the operation example of the recorder in the software update system shown in FIG. It is a flowchart for demonstrating the operation example of TV in the software update system shown in FIG. FIG. 13 is a flowchart for explaining an operation example of the AV amplifier in the software update system shown in FIG. 12. It is a figure for demonstrating an example of the command flow by the software update system shown in FIG.

  Hereinafter, preferred embodiments according to a software update system, an electronic apparatus, and a software update method of the present invention will be described with reference to the accompanying drawings. In the drawings, the same components are denoted by the same reference numerals, and repeated description is omitted. Although the HDMI is described as an example of the communication interface, the present invention can be applied to all communication interfaces having an audio transmission line such as IEEE1394.

  FIG. 1 is a diagram showing an example of a software update system according to a reference example of the present invention, in which 1 denotes a recorder, 2 denotes an AV amplifier, 3 denotes a TV (television), and 4 denotes an HDMI cable. The recorder 1 corresponds to a first electronic device and is called a source device in the HDMI standard. The AV amplifier 2 corresponds to a second electronic device and is called a repeater device in the HDMI standard. The TV 3 corresponds to a display device, and is called a sink device in the HDMI standard. In this reference example, description will be made based on a system configuration in which the recorder 1 and the AV amplifier 2 are directly HDMI-connected and the TV 3 is HDMI-connected to the AV amplifier 2. That is, the recorder 1 and the AV amplifier 2, the AV amplifier 2 and the TV 3 are connected by the HDMI cable 4, respectively.

  The HDMI cable 4 transmits a TMDS (Transition Minimized Differential Signaling) line (digital signal line) for transmitting video and audio signals, which are digital signals, in a differential manner and a common control signal (CEC message) between devices. And a CEC line which is a bidirectional bus. In addition, the HDMI cable 4 includes a DDC (Display Data Channel) line used for transmission of EDID (Extended Display Identification Data), HDCP (High-bandwidth Digital Content Protection System) authentication, and the like.

  Here, the CEC message is a device control signal based on the CEC protocol of the HDMI standard. Various operation controls are realized between HDMI devices by exchanging the device control signals between the devices. In the case of CEC, since the logical address (device type) and physical address (device position) of each HDMI-connected device are acquired, a CEC message can be transmitted to a desired device by specifying this logical address. Can do.

Hereinafter, a logical address and a physical address in CEC will be briefly described.
First, in the HDMI CEC standard, a plurality of logical addresses can be handled according to the type of device, and is the only name in the HDMI network. This logical address differs depending on the type of HDMI device. For example, a logical address “0” indicates a display device such as a television, “1” indicates a recording device such as a BD / DVD / HDD recorder, and “5” indicates an audio device such as a speaker or an AV amplifier.

  In addition, the physical address is the only name in the HDMI network, but usually a physical address (0.0.0.0) is assigned to the display device. In addition, when an HDMI device is added to or disconnected from an HDMI network, the adjustment is automatically made. The physical address has a plurality of hierarchical addresses including the display device, is composed of a unique number n in the same hierarchical layer, and is expressed in the form (nnn nn). When the hierarchy of the HDMI device directly connected to the display device is the first hierarchy, the HDMI device connected to the device of the first hierarchy is the second hierarchy, and the hierarchy number is increased as the distance from the display device increases. Then, the layer number is expressed so as to increase from the leftmost n in the format (nnnnn) to the right.

  In the case of an HDMI device, since it has such a logical address and a physical address, even if a plurality of HDMI devices are connected to the HDMI network, it is possible to designate a specific one and transmit a CEC message. It becomes.

  FIG. 2 is a block diagram showing a configuration example of the recorder 1 and the AV amplifier 2 shown in FIG. In the figure, a recorder 1 includes a tuner 11 that receives broadcast waves via an antenna, a communication unit 12 connected to a network (communication network) such as the Internet, and update data of the AV amplifier 2 from the broadcast waves received by the tuner 11. The update data extraction unit 13 for extracting the data, the controller 14 for controlling the operation of the recorder 1, the HDD (Hard Disk Drive) 15 for storing various data such as update data, and the video signal acquired by the tuner 11 or the communication unit 12 A video signal processing unit 16 that processes the audio signal, and an audio signal processing unit 17 that processes an audio signal acquired by the tuner 11 or the communication unit 12.

  The recorder 1 writes the video signal output from the video signal processing unit 16 and the audio signal output from the audio signal processing unit 17 on an optical disc such as a BD / DVD, and the video signal recorded on the optical disc and An optical disk drive unit 18 that reads audio signals and an HDMI transmission unit 19 that transmits video signals and audio signals to the AV amplifier 2 and transmits and receives CEC messages to and from the AV amplifiers 2 and 3 are provided. The HDMI transmission unit 19 can transmit the update data of the AV amplifier 2 acquired from the broadcast network or the communication network using an audio transmission line included in the TMDS line.

  The AV amplifier 2 is transmitted from the controller 21 that controls the operation of the AV amplifier 2, the flash memory 22 that is a nonvolatile semiconductor memory, the audio amplifier 23 that outputs sound from a speaker (not shown), and the recorder 1. Between the recorder 1 and the update data extractor 24 that extracts the update data to be transmitted, the audio signal processor 25 that processes the audio signal transmitted from the recorder 1, and the video signal and audio signal received from the recorder 1. The HDMI receiving unit 26 that transmits and receives CEC messages to each other and the HDMI transmitting unit 27 that transmits video signals and audio signals to the TV 3 and also transmits and receives CEC messages to and from the TV 3 are provided. The AV amplifier 2 is an electronic device that does not have the tuner 11 or the communication unit 12.

  The main feature of the present invention is that, in a system in which a plurality of electronic devices are HDMI-connected, even if the electronic device does not have a broadcast reception function or a network connection function, the software can be updated quickly and easily. There is. As a configuration for this, the recorder 1 includes a tuner 11 or a communication unit 12 corresponding to update data acquisition means for acquiring update data for updating the software of the AV amplifier 2, and audio transmission in the HDMI standard for the acquired update data. And an HDMI transmission unit 19 corresponding to update data transmission means for transmitting to the AV amplifier 2 via a line. The AV amplifier 2 includes a controller 21 corresponding to software updating means for updating the software of the AV amplifier 2 with the update data transmitted from the recorder 1.

  In the following description, firmware is exemplified as the software. Further, the update data may be in the form of update firmware that updates the entire firmware, or may be in the form of a patch file (modification program) that is partially updated.

  In FIG. 2, the tuner 11 corresponds to a receiving means for receiving a broadcast wave including update data. The communication unit 12 corresponds to a network connection unit that connects to a server device (not shown) storing update data via a network and downloads update data from the server device. Hereinafter, a case where update data is acquired by the tuner 11 or the communication unit 12 will be described. The update data is recorded on various recording media such as an optical disk (BD, DVD, etc.), a USB memory, a memory card, and the like. Update data may be obtained from

  The TV 3 is indirectly HDMI-connected to the recorder 1 via the AV amplifier 2. The recorder 1 includes an HDD 15 corresponding to identification information storage means for storing identification information of the AV amplifier 2 and firmware version information. When the update data acquired by the tuner 11 or the communication unit 12 includes the identification information of the AV amplifier 2 and the firmware version information, and the firmware version information is newer than the version information stored in the HDD 15, the recorder 1 A selection screen signal for allowing the user to select whether or not to update the firmware of the AV amplifier 2 is transmitted to the TV 3 through the video transmission line in the HDMI standard. When the user instructs to update the firmware on the selection screen displayed on the TV 3, the HDMI transmission unit 19 transmits the update data to the AV amplifier 2 through the audio transmission line.

  In the update data included in the broadcast wave, identification information of one or more devices to be updated and firmware version information are described in advance in the header or the like. The recorder 1 receives the update data received by the tuner 11 as AV. It is determined whether or not the update data has the identification information of the amplifier 2, and it is further determined whether or not the version information of the firmware is newer than the version information stored in the HDD 15. The recorder 1 is update data having identification information of the AV amplifier 2 and stores the update data in the HDD 15 when the version information is new. The identification information is not particularly limited as long as it is unique information that can specify a device, such as a model name, a model number, and a manufacturing number.

  Further, the recorder 1 needs to hold the identification information of the AV amplifier 2 and the firmware version information in advance. This is because, for example, a predetermined CEC message is transmitted to the AV amplifier 2 when the recorder 1 is started. Thus, the identification information and firmware version information may be received from the AV amplifier 2 and stored in the HDD 15. As the CEC message, a vendor command that instructs the AV amplifier 2 to transmit the identification information and firmware version information held by the AV amplifier 2 to the recorder 1 can be used. This vendor command is a CEC message that can be uniquely defined by the manufacturer.

  Here, in the case of this example, as described above, a screen for selecting whether or not to update the firmware of the AV amplifier 2 is displayed on the TV 3, and the firmware update processing is performed based on a user instruction. ing. For this reason, it is necessary to secure a video transmission line in order to transmit the selection screen signal. Further, during the firmware update process, it is preferable to display a caution display for notifying the user of this, and a video transmission line is also required for this purpose. In the case of the present invention, since the update data of the AV amplifier 2 is transmitted by the audio transmission line of the TMDS line, the video transmission line can be used for displaying various UI (user interface) screens and caution screens.

  Since the physical transmission rate of the audio transmission line can be about 1,536 Mbps (16 bits × 2 ch × 48 kHz fs) or more, if the data capacity of the firmware of the AV amplifier 2 to be updated is about 1 MB, the time required for data transmission 8,000,000 (bits) / 1,536 M (bps) ≈5.2 seconds. As described above, by using the audio transmission line in the HDMI standard, it is possible to significantly reduce the transmission time of the update data as compared with the case of using the CEC line, which is a sufficiently practical level. I understand that.

  Various timings for updating the firmware of the AV amplifier 2 are conceivable, for example, when the recorder 1 is activated or terminated, or when an update instruction is given by the user.

  In the above example, the update process is described based on the firmware update instruction from the user. However, the update process may be automatically executed at night or when the user is absent. In this case, the recorder 1 determines whether the update data acquired from the broadcast wave includes the identification information of the AV amplifier 2 and the firmware version information, and the version information is newer than the version information stored in the HDD 15. When the version information of the update data is newer, the HDMI transmission unit 19 automatically transmits the update data to the AV amplifier 2 through the audio transmission line. The AV amplifier 2 automatically updates its own firmware with the update data transmitted from the recorder 1. In addition, since it is not necessary to display a UI screen or a caution screen to the user, the TV 3 may not be connected.

  FIG. 3 is a diagram for explaining an example of a method for acquiring update data of the AV amplifier 2 by the recorder 1, and in the figure, 5 indicates update firmware data (update data). The update firmware data 5 includes a header 51, firmware data 52 of the recorder 1 (or TV 3), and firmware data 53 of the AV amplifier 2. First, the recorder 1 acquires the update firmware data 5 including the firmware data 52 of the recorder 1 and the firmware data 53 of the AV amplifier 2 by broadcast waves, and stores this in the HDD 15. In the header 51, model names and firmware version information of the recorder 1 and the AV amplifier 2 are described.

  When the user activates the recorder 1 or when there is an instruction to update the AV amplifier 2 by a user operation, the recorder 1 uses the CEC message or the like from the AV amplifier 2 currently connected to the recorder 1. Get model name and firmware version information. Then, the recorder 1 compares the model name and version information of the AV amplifier 2 described in the header 51 with the model name and version information acquired from the AV amplifier 2, the model names match, and the header 51 When the version information described in the above item is newer, the update firmware data 5 is stored in the HDD 15 and the updating of the firmware of the AV amplifier 2 is permitted. If the model names do not match, or if the version information described in the header 51 is the same or an older version even if the model names match, the update firmware data 5 is deleted from the HDD 15.

  In the example of FIG. 3, the update firmware data 5 may be a combination of update data of the recorder 1 and update data of one or more AV amplifiers connectable to the recorder 1. That is, the header 51 describes a combination of model names of a plurality of AV amplifiers and firmware version information for the model name of the recorder 1. For example, if there are five types of AV amplifiers that can be connected to the recorder 1, five pairs of update firmware data are described. If there are two types of AV amplifiers connected to the recorder 1, the recorder 1 acquires the update firmware data for the recorder 1 and the update firmware data for the two corresponding AV amplifiers. That's fine. Note that the recorder 1 can also update the firmware of the recorder 1 with the acquired update firmware data by the controller 14 in the same manner as the AV amplifier 2.

  In the case of the configuration example of FIG. 2, one AV amplifier 2 is connected to the recorder 1, but the same processing is possible even when a plurality of repeater devices such as AV amplifiers or switchers are connected in a hierarchical manner. is there. For example, when another AV amplifier is HDMI-connected to the subsequent stage of the AV amplifier 2 and the update data having the identification information of this other AV amplifier is transmitted, the AV amplifier 2 passes through the update data of the other AV amplifier. Just make arrangements to do so. In this case, since the audio transmission line of the AV amplifier 2 is switched from the TV 3 to another AV amplifier, the audio path of the AV amplifier 2 is not switched on the screen of the TV 3 during the firmware update process. It is good to display the message for notifying a user.

  FIG. 4 is a diagram for explaining another example of the update data acquisition method of the AV amplifier 2 by the recorder 1, in which 6 denotes a server device. The server device 6 stores an AV amplifier upgrade management file. In this example, the recorder 1 is currently connected to the recorder 1 using a CEC message or the like when the user activates the recorder 1 or when an instruction to update the AV amplifier 2 is made by a user operation. The model name and firmware version information are acquired from the AV amplifier 2.

  Then, the recorder 1 accesses the server device 6 via a network, for example, and refers to the AV amplifier upgrade management file stored in the server 6. Here, it is assumed that models A to E exist as AV amplifiers that can be connected to the recorder 1 and firmware can be updated, and the model A corresponds to the AV amplifier 2. This version upgrade management file describes the latest version information of firmware, the firmware data storage location (URL on the Internet), etc. for each AV amplifier (model name).

  The recorder 1 compares the version information acquired from the AV amplifier 2 with the version information of the AV amplifier 2 (model A) described in the upgrade management file, and compares the version information described in the upgrade management file. If the version is newer, the storage location described in the upgrade management file is accessed to obtain new update firmware data. The storage location of the update firmware data may be the server device 6 that stores the upgrade management file. In this way, updating of the firmware of the AV amplifier 2 is permitted.

  A countermeasure to be taken when a failure such as a power failure occurs during transmission of update data from the recorder 1 to the AV amplifier 2 or firmware update in the AV amplifier 2 in FIG. 2 will be described below.

  The recorder 1 stores the update data acquired by the tuner 11 in the HDD 15 corresponding to update data storage means. The recorder 1 then deletes the update data in the HDD 15 after the transmission of the update data to the AV amplifier 2 is completed by the HDMI transmission unit 19. According to this, even if a failure such as a power failure occurs during transmission of the update data and the transmission process is interrupted, the update data is stored in the HDD 15, so that the transmission process can be performed again after the failure recovery. .

  The AV amplifier 2 stores the update data transmitted from the recorder 1 in the flash memory 22 corresponding to the update data memory means. The AV amplifier 2 deletes the update data in the flash memory 22 after the firmware update is completed by the controller 21. According to this, even if a failure such as a power failure occurs during the firmware update and the update process is interrupted, the update data is stored in the flash memory 22, so the update process can be performed again after the failure is recovered. it can.

  FIG. 5 is a flowchart for explaining an operation example of the recorder 1 in the software update system shown in FIG. First, the recorder 1 determines whether or not the update data of the AV amplifier 2 is included in the broadcast wave (step S1). If the update data is not included in the broadcast wave, or the update data is the AV amplifier 2 or not. If the update data is not the update data, or if the version information of the update data is the same as or older than the current version information of the AV amplifier 2 (in the case of NO), the normal operation is started. In step S1, if the update data of the AV amplifier 2 is included in the broadcast wave and the version information is newer than the current version information of the AV amplifier 2 (in the case of YES), the update data is stored in the HDD 15. (Step S2).

  Next, the recorder 1 transmits a selection screen signal for allowing the user to select whether or not to update the firmware of the AV amplifier 2 to the TV 3 through the video transmission line, and displays the update selection screen on the TV 3 (step S3). . When the user does not select the update process on the update selection screen of TV3 (in the case of NO), the process returns to step S3 and the normal operation is performed while the update selection screen is displayed again at a predetermined interval or when the power is turned off. To display. In step S3, when the user selects update processing on the update selection screen of TV 3 (in the case of YES), a CEC message for notifying that update data is transmitted is transmitted to the AV amplifier 2 (step S4). ). Then, the recorder 1 starts transmitting update data to the AV amplifier 2 through the audio transmission line (step S5).

  In steps S4 and S5, the HDMI transmission unit 19 of the recorder 1 transmits a CEC message to the AV amplifier 2 for notifying that the update data is transmitted before the update data is transmitted to the AV amplifier 2 through the audio transmission line. Send. At this time, the AV amplifier 2 that has received the CEC message may mute all the audio outputs. Specifically, in FIG. 2, the AV amplifier 2 includes an audio signal processing unit 25 corresponding to an audio output unit that outputs an audio signal transmitted from the recorder 1 to an internal speaker or an external speaker. The controller 21 controls to mute the audio output from the audio signal processing unit 25 from the time when the CEC message is received until the update data transmission process is completed.

  In the above, in the present invention, since update data is transmitted using a voice transmission line for transmitting a voice signal originally, if this update data is reproduced by mistake, the user may feel uncomfortable or a speaker May be damaged. For this reason, this is prevented by muting the audio output.

  In FIG. 5, the recorder 1 determines whether or not the update data transmission process has ended normally (step S <b> 6). If the transmission process does not end normally due to a failure such as a power failure (NO), Returning to step S3, an update selection screen is displayed on the TV 3 after failure recovery. In step S6, when the transmission process ends normally (in the case of YES), the update data stored in the HDD 15 is deleted and the process ends (step S7).

  FIG. 6 is a flowchart for explaining an operation example of the AV amplifier 2 in the software update system shown in FIG. First, the AV amplifier 2 determines whether or not a CEC message for notifying that the update data is to be transmitted is received from the recorder 1 (step S11). When the CEC message is not received (in the case of NO), Move to normal operation. In step S11, when a CEC message is received (in the case of YES), update data transmitted from the recorder 1 through the audio transmission line is stored in the flash memory 22 (step S12). As described above, during the update data transmission process, all audio outputs of the AV amplifier 2 are controlled to be muted.

  Next, the AV amplifier 2 determines whether or not the reception of the update data has been completed normally (step S13). If the reception has been completed normally (in the case of YES), the recorder 1 indicates that the reception has been successfully performed. (Step S14). In step S13, if the reception is not completed normally (in the case of NO), an error is displayed on the screen of the TV 3 (step S15), and the normal operation is started.

  Next, the AV amplifier 2 updates the firmware of the AV amplifier 2 based on the received update data (step S16). Then, the AV amplifier 2 determines whether or not the firmware update process has been completed normally (step S17). If the update process has been completed normally (in the case of YES), the update data in the flash memory 22 is discarded. Then, the process ends (step S18). In step S17, when the update process is not normally terminated due to a failure such as a power failure (in the case of NO), the process returns to step S16, and the update process is performed again after the failure is recovered.

  FIG. 7 is a diagram for explaining an example of a command flow by the software update system shown in FIG. 1, in which 7 indicates a broadcasting station. First, the broadcast station 7 transmits the update data of the AV amplifier 2 by broadcast waves (S21), and the recorder 1 receives this broadcast wave and stores the update data of the AV amplifier 2 in the HDD 15 (S22). When the user permits updating of the firmware of the AV amplifier 2 on the above-described update selection screen, the recorder 1 transmits a CEC message for notifying that the update data is transmitted to the AV amplifier 2 (S23). The AV amplifier 2 returns a response to this CEC message to the recorder 1 (S24).

  Next, the recorder 1 transmits the update data stored in the HDD 15 to the AV amplifier 2 via the audio transmission line (S25). The AV amplifier 2 stores the update data transmitted from the recorder 1 in the flash memory 22 (S26). When the AV amplifier 2 detects the end of the update data (S27), it returns a data reception completion response to the recorder 1 (S28). When receiving the data reception completion response from the AV amplifier 2, the recorder 1 discards the update data in the HDD 15 (S29).

  Then, the AV amplifier 2 updates the firmware with the update data stored in the flash memory 22 (S30), and when the update process ends normally, discards the update data in the flash memory 22 (S31).

  Here, in the audio transmission line in HDMI, data and a transmission clock are extracted from the transmission waveform, and therefore data cannot be received until the receiving device (AV amplifier side) is in a PLL (Phase Locked Loop) locked state. Therefore, if the update data is simply sent through the voice transmission line, the head portion of the update data may be lost.

  As the above countermeasure, the HDMI transmission unit 19 of the recorder 1 may transmit the dummy data added to the head of the update data based on an instruction from the controller 14 as shown in FIG. This dummy data is generated by, for example, the controller 14 of the recorder 1, and the dummy data is added to the head of the update data in the HDMI transmission unit 19 based on the control from the controller 14.

  By completing the PLL lock in the AV amplifier 2 in the dummy data portion, data loss can be prevented. If the data amount of the dummy data is inadvertently increased, the storage capacity of the buffer memory 29 described later is occupied, which is not preferable. Since the data amount (data length) of the dummy data only needs to be transmitted from the start of transmission to the PLL lock state, it may be determined as appropriate according to the hardware configuration.

  FIG. 9 is a diagram showing an example of a format of update data transmitted from the recorder 1 to the AV amplifier 2. This example shows a data format when the firmware of up to three devices included in the AV amplifier 2 is updated, FIG. 9A shows the data format of update data, and FIG. 9B shows the details of the header.

  In the example shown in FIG. 9A, the update data of the devices 1 to 3 are described based on a predetermined rule. Therefore, in order to distinguish update data from dummy data, for example, the data format of dummy data is made different from the data format of update data. The data format of the dummy data may be any data format that is not used as update data. For example, “Lch data: 0x1334, Rch data: 0x5678” is continuously output. As a result, the update data extraction unit 24 of the AV amplifier 2 can extract only the update data while distinguishing the dummy data.

  Further, fixed data including identification information (for example, model name) of the AV amplifier 2 may be added to the header of the update data. According to the header example shown in FIG. 9B, the values of the 0th to 7th bytes of the devices 1 to 3 included in the AV amplifier 2 are unique fixed values representing the model name and the device name. Therefore, by detecting the fixed data of the header, it can be specified that the data is the update data of the AV amplifier 2. As a result, the update data extraction unit 24 of the AV amplifier 2 can distinguish update data and dummy data and extract only update data. As the dummy data, an appropriate value different from the fixed value may be set.

  FIG. 10 is a block diagram showing a specific configuration example for extracting update data in the AV amplifier 2, wherein 28 is a changeover switch, 29 is a buffer memory, 30 is a header detection unit corresponding to header detection means, and 31 is An update data extraction unit corresponding to update data extraction means is shown. When the AV amplifier 2 receives the CEC message for notifying that the update data is to be transmitted from the recorder 1, the controller 21 switches the changeover switch 28 from “during normal operation” to “during update”. As a result, the AV amplifier 2 shifts to the firmware update processing mode.

  In the AV amplifier 2, transmission data including dummy data and update data transmitted from the recorder 1 is temporarily stored in the buffer memory 29. The header detection unit 30 detects the header of the update data from the transmission data stored in the buffer memory 29. The update data extraction unit 31 extracts only the update data of the AV amplifier 2 based on the fixed data of the header detected by the header detection unit 30. Whether or not this is update data of the AV amplifier 2 can be determined from the identification information included in the fixed data. The update data extracted by the update data extraction unit 31 is stored in the flash memory 22.

  In this way, the update data and the dummy data are distinguished by the fixed data added to the header of the update data, and only the update data of the AV amplifier 2 can be extracted. Even if a plurality of AV amplifiers are connected, each AV amplifier can extract only its own update data from the plurality of update data.

  FIG. 11 is a block diagram showing another specific configuration example for extracting update data in the AV amplifier 2, wherein 32 denotes a header detection unit, 33 denotes an update data writing unit, and 34 denotes an update data extraction unit. . When the AV amplifier 2 receives the CEC message for notifying that the update data is to be transmitted from the recorder 1, as in the configuration of FIG. 10, the controller 21 changes the changeover switch 28 from “normal operation” to “update time”. To "". As a result, the AV amplifier 2 shifts to the firmware update processing mode.

  In the AV amplifier 2, the header detection unit 32 detects the header of the update data from the transmission data including the dummy data and update data transmitted from the recorder 1. The update data extraction unit 34 extracts only the update data of the AV amplifier 2 based on the header fixed data detected by the header detection unit 32. Then, the update data writing unit 33 writes the update data extracted by the update data extraction unit 34 in the flash memory 22 and stores it. Also in this case, similarly to the example of FIG. 10, the update data and the dummy data are distinguished by the fixed data, and only the update data of the AV amplifier 2 can be extracted.

  In the case of the configuration shown in FIG. 11, since the header detection unit 32, the update data extraction unit 34, and the update data writing unit 33 are provided as dedicated hardware, the update is performed in comparison with the configuration shown in FIG. 10 above. Data can be stored in the flash memory 22 at high speed.

(Embodiment of the present invention)
FIG. 12 is a diagram showing an example of a software update system according to an embodiment of the present invention, in which 8 denotes a TV. In the present embodiment, a description will be given based on a system configuration in which the recorder 1 and the AV amplifier 2 are indirectly HDMI-connected via the TV 8. That is, the recorder 1 and the TV 8, and the TV 8 and the AV amplifier 2 are respectively connected by the HDMI cable 4, and the recorder 1 is indirectly connected to the AV amplifier 2 through the TV 8 by HDMI. When the recorder 1 transmits update data to the AV amplifier 2, the TV 8 and the AV amplifier 2 switch the transmission direction of the audio transmission line in HDMI in the direction in which the update data is transmitted from the TV 8 to the AV amplifier 2.

  FIG. 13 is a block diagram illustrating a configuration example of the recorder 1, the AV amplifier 2, and the TV 8 illustrated in FIG. In the figure, the TV 8 is connected to the first HDMI receiving unit 81 connected to the HDMI transmitting unit 19 of the recorder 1 via the HDMI cable 4 and to the HDMI transmitting unit 27 of the AV amplifier 2 via the HDMI cable 4. A second HDMI receiving unit 82, a signal selector 83 that selectively outputs one of the input from the first HDMI receiving unit 81 and the input from the second HDMI receiving unit 82, and a “normal operation mode”. A changeover switch 84 for switching between the “firmware update processing mode”, a video / audio reproduction circuit 85 for reproducing a video signal and an audio signal, and a controller 86 for controlling the operation of the TV 8 are provided. Note that the description of the tuner circuit of the TV 8 is omitted.

  Specifically, before transmitting the update data to the AV amplifier 2 via the audio transmission line, the HDMI transmission unit 19 of the recorder 1 transmits a CEC message for notifying that the update data is transmitted to the TV 8 and the AV amplifier 2. The TV 8 and the AV amplifier 2 switch the transmission direction of the audio transmission line in response to reception of this CEC message. In FIG. 13, when the TV 8 receives the CEC message from the recorder 1, the signal selector 83 selects the input from the first HDMI receiving unit 81, controls the changeover switch 84 from the controller 86, and sets the changeover switch 84 to “data”. Switch to “Transmitting” side. Then, the second HDMI receiving unit 82 switches the transmission direction of the audio transmission line from the TV 8 to the AV amplifier 2 based on an instruction from the controller 86.

  When the AV amplifier 2 receives the CEC message from the recorder 1, the HDMI transmission unit 27 switches the transmission direction of the audio transmission line from the TV 8 to the AV amplifier 2 based on an instruction from the controller 21. During normal operation, the transmission direction of the audio transmission line is switched from the AV amplifier 2 to the TV 8.

  FIG. 14 is a flowchart for explaining an operation example of the recorder 1 in the software update system shown in FIG. First, the recorder 1 determines whether or not the update data of the AV amplifier 2 is included in the broadcast wave (step S41). If the update data is not included in the broadcast wave, or the update data is the AV amplifier 2 or not. If the update data is not the update data or if the version information of the update data is the same as or older than the current version information of the AV amplifier 2 (in the case of NO), the normal operation is started. In step S41, when the update data of the AV amplifier 2 is included in the broadcast wave and the version information is newer than the current version information of the AV amplifier 2 (in the case of YES), the update data is stored in the HDD 15. (Step S42).

  Next, the recorder 1 transmits a selection screen signal for allowing the user to select whether or not to update the firmware of the AV amplifier 2 to the TV 8 through the video transmission line, and displays the update selection screen on the TV 8 (step S43). . If the user does not select the update process on the update selection screen of TV 8 (in the case of NO), the process returns to step S43 and the normal operation is performed while the update selection screen is displayed again at a predetermined interval or when the power is turned off. To display. In step S43, when the user selects update processing on the update selection screen of TV8 (in the case of YES), a CEC message for notifying that update data is to be transmitted is transmitted to TV8 and AV amplifier 2 ( Step S44). Then, the recorder 1 starts transmitting update data to the TV 8 (via the AV amplifier 2 via the audio transmission line) (step S45).

  In steps S44 and S45, the HDMI transmission unit 19 of the recorder 1 notifies that the update data is to be transmitted before the update data is transmitted to the TV 8 (via the AV amplifier 2 via the audio transmission line). A CEC message is transmitted to the TV 8 and the AV amplifier 2. At this time, the TV 8 and the AV amplifier 2 that have received the CEC message may mute all the audio outputs from the time when the CEC message is received until the update data transmission processing is completed.

  Next, the recorder 1 determines whether or not the transmission process of the update data has ended normally (step S46), and if the transmission process has not ended normally due to a failure such as a power failure (in the case of NO), the step Returning to S43, the update selection screen is displayed on the TV 8 after the failure is recovered. In step S46, if the transmission process ends normally (in the case of YES), the update data stored in the HDD 15 is deleted and the process ends (step S47).

  FIG. 15 is a flowchart for explaining an operation example of the TV 8 in the software update system shown in FIG. First, the TV 8 determines whether or not a CEC message for notifying that update data is to be transmitted is received from the recorder 1 (step S51). When the CEC message is not received (in the case of NO), Move to normal operation. If a CEC message is received in step S51 (YES), all audio outputs are muted (step S52), and the signal selector 83 selects an input from the first HDMI receiving unit 81 (step S53). ). Then, the selector switch 84 is switched to the “data transmission in progress” side, and the transmission direction of the audio transmission line of the second HDMI receiving unit 82 is switched from the TV 8 to the AV amplifier 2 (step S54).

  Next, the TV 8 transmits the update data received from the recorder 1 to the AV amplifier 2 (step S55), and determines whether or not the transmission of the update data has been normally completed (step S56). Here, when the transmission of the update data is normally completed (in the case of YES), the changeover switch 84 is switched to the “normal operation” side, and the transmission direction of the audio transmission line of the second HDMI receiving unit 82 is set to the AV amplifier 2. To TV8 (step S57). If transmission of update data has not been completed yet (in the case of NO), the process returns to step S55 to continue the transmission process.

  FIG. 16 is a flowchart for explaining an operation example of the AV amplifier 2 in the software update system shown in FIG. First, the AV amplifier 2 determines whether or not a CEC message for notifying that update data is to be transmitted has been received from the recorder 1 (step S61). When the CEC message is not received (in the case of NO), Move to normal operation. In step S61, when a CEC message is received (in the case of YES), update data transmitted from the recorder 1 through the audio transmission line is stored in the flash memory 22 (step S62). During this update data transmission process, all audio outputs of the AV amplifier 2 are controlled to be muted.

  Next, the AV amplifier 2 determines whether or not the reception of the update data has been normally completed (step S63). If the reception has been normally completed (in the case of YES), the AV amplifier 2 indicates that the update data has been normally received. The recorder 1 is notified (step S64). In step S63, if the reception has not been completed normally (in the case of NO), an error is displayed on the screen of the TV 8 (step S65), and the normal operation is started.

  Next, the AV amplifier 2 updates the firmware of the AV amplifier 2 based on the received update data (step S66). Then, the AV amplifier 2 determines whether or not the firmware update process has ended normally (step S67). If the update process has ended normally (YES), the update data in the flash memory 22 is discarded. Then, the process ends (step S68). In step S67, when the update process is not normally terminated due to a failure such as a power failure (in the case of NO), the process returns to step S66, and the update process is performed again after the failure is recovered.

  FIG. 17 is a diagram for explaining an example of a command flow by the software update system shown in FIG. First, the broadcast station 7 transmits the update data of the AV amplifier 2 by a broadcast wave (S71), and the recorder 1 receives this broadcast wave and stores the update data of the AV amplifier 2 in the HDD 15 (S72). When the user permits updating of the firmware of the AV amplifier 2 on the update selection screen described above, the recorder 1 transmits a CEC message for notifying that the update data is transmitted to the TV 8 and the AV amplifier 2 ( S73).

  When the TV 8 receives the CEC message from the recorder 1, the audio output is muted (S74), and the signal selector 83 selects the input from the first HDMI receiving unit 81 (S75). Then, the TV 8 switches the selector switch 84 to the “data transmitting” side, and switches the transmission direction of the audio transmission line of the second HDMI receiving unit 82 from the TV 8 to the AV amplifier 2 (S76). Then, the TV 8 and the AV amplifier 2 return a response to this CEC message to the recorder 1 (S77).

  Next, the recorder 1 transmits the update data stored in the HDD 15 to the AV amplifier 2 through the audio transmission line (S78). The AV amplifier 2 stores the update data transmitted from the recorder 1 via the TV 8 in the flash memory 22 (S79), and detects the end of the update data (S80). Return to 1 (S81). When receiving the data reception completion response from the AV amplifier 2, the recorder 1 discards the update data in the HDD 15 (S82).

  Then, the TV 8 switches the changeover switch 84 to the “normal operation” side, and returns the transmission direction of the audio transmission line of the second HDMI receiving unit 82 from the AV amplifier 2 to the TV 8 (S83). Further, the AV amplifier 2 updates the firmware with the update data stored in the flash memory 22 (S84), and when the update process is normally completed, the AV amplifier 2 discards the update data in the flash memory 22 (S85).

  As described above, HDMI has been described as an example of the communication interface. However, the present invention is not limited to this HDMI, and can be applied to any communication interface having an audio transmission line such as IEEE1394.

DESCRIPTION OF SYMBOLS 1 ... Recorder, 2 ... AV amplifier, 3, 8 ... TV, 4 ... HDMI cable, 5 ... Update firmware data, 6 ... Server apparatus, 7 ... Broadcast station, 11 ... Tuner, 12 ... Communication part, 13, 24, 31, 34 ... update data extraction unit, 14, 21, 86 ... controller, 15 ... HDD, 16 ... video signal processing unit, 17, 25 ... audio signal processing unit, 18 ... optical disk drive unit, 19, 27 ... HDMI transmission unit 22 ... Flash memory, 23 ... Audio amplifier, 26 ... HDMI receiving unit, 28, 84 ... Changeover switch, 29 ... Buffer memory, 30,32 ... Header detection unit, 33 ... Update data writing unit, 81 ... First HDMI receiving unit, 82... Second HDMI receiving unit, 83... Signal selector, 85.

Claims (21)

A software update system in which a first electronic device and a display device are connected via a communication interface, and the display device and a second electronic device are connected.
The first electronic device includes update data acquisition means for acquiring update data for updating software of the second electronic device, and the acquired update data via the display device via an audio transmission line of the communication interface. And update data transmission means for transmitting to the second electronic device.
The second electronic device includes software updating means for updating software of the second electronic device with update data transmitted from the first electronic device via the display device. Update system.   2. The software update system according to claim 1, wherein the first electronic device includes an identification information storage unit that stores identification information of the second electronic device and software version information. Whether the second electronic device software is updated when the identification information of the second electronic device and the software version information are included and the version information of the software is newer than the version information stored in the identification information storage means. A selection screen signal for allowing the user to select whether or not to transmit to the display device via the video transmission line of the communication interface, the user is instructed to select software update on the selection screen displayed on the display device, When the first electronic device transmits the update data to the second electronic device, the display device Fine said second electronic device, the software update system according to claim in a direction in which the update data is transmitted from the display device to the second electronic device, to switch the transmission direction of the audio transmission line.   3. The software update system according to claim 2, wherein the update data transmission means notifies that the update data is transmitted before the update data is transmitted to the second electronic device via the voice transmission line. The command is transmitted to the display device and the second electronic device, and the display device and the second electronic device switch the transmission direction of the audio transmission line in response to reception of the command. Software update system.   2. The software update system according to claim 1, wherein the first electronic device includes an identification information storage unit that stores identification information of the second electronic device and software version information. 2, when the software version information is newer than the version information stored in the identification information storage means, the update data transmission means sends the update data to the update information. A software update system for transmitting to the second electronic device by an audio transmission line.   5. The software update system according to claim 2, wherein the first electronic device transmits a predetermined command to the second electronic device, whereby the second electronic device transmits the predetermined command. A software update system characterized by receiving identification information of the second electronic device and software version information and storing them in the identification information storage means.   5. The software update system according to claim 1, wherein the update data transmission unit transmits the update data before transmitting the update data to the second electronic device via the voice transmission line. 6. A software update system, wherein a command for notifying that data is to be transmitted is transmitted to the second electronic device.   7. The software update system according to claim 6, wherein the second electronic device includes an audio output unit that outputs an audio signal transmitted from the first electronic device to an internal speaker or an external speaker, and receives the command. A software update system characterized in that the audio output by the audio output means is muted from when the update data is transmitted until the update data is transmitted.   The software update system according to any one of claims 1 to 7, wherein the update data includes update data of the first electronic device and one or more second devices connectable to the first electronic device. A software update system characterized by being combined with update data of electronic devices.   9. The software update system according to claim 1, wherein the first electronic device includes update data storage means for storing update data acquired by the update data acquisition means, and the update data transmission. A software update system for deleting update data from the update data storage means after transmission of update data to the second electronic device is completed by the means.   10. The software update system according to claim 1, wherein the second electronic device includes an update data memory unit that stores update data transmitted from the first electronic device. A software update system for deleting update data from the update data memory means after the software update by the update means is completed.   The software update system according to any one of claims 1 to 10, wherein the update data transmission means transmits dummy data added to a head of the update data.   12. The software update system according to claim 11, wherein a data format of the dummy data is different from a data format of the update data.   12. The software update system according to claim 11, wherein fixed data including identification information of the second electronic device is added to a header of the update data.   14. The software update system according to claim 13, wherein the second electronic device detects a header of the update data from transmission data including dummy data and update data transmitted from the first electronic device. Update data extraction means for extracting update data of the second electronic device based on the detected fixed data of the header, and update data memory means provided in the second electronic device for the extracted update data A software update system characterized in that it is stored in   14. The software updating system according to claim 13, wherein the second electronic device temporarily stores transmission data including dummy data and update data transmitted from the first electronic device, and the buffer. Header detection means for detecting a header of the update data from transmission data stored in a memory, and update data extraction means for extracting update data of the second electronic device based on the detected fixed data of the header A software update system, wherein the extracted update data is stored in an update data memory means provided in the second electronic device.   16. The software update system according to claim 1, wherein the update data acquisition unit is a reception unit that receives a broadcast wave including update data.   The software update system according to any one of claims 1 to 15, wherein the update data acquisition means is connected to a server device storing update data via a network and downloads update data from the server device. A software update system characterized by being a connection means.   The software update system according to claim 1, wherein the communication interface is HDMI, the first electronic device is a source device, and the second electronic device is a repeater device. Software update system.   18. The software update system according to claim 1, wherein the communication interface is IEEE1394. An electronic device constituting the software update system according to any one of claims 1 to 19,
The electronic device includes update data acquisition means for acquiring update data for updating software of another electronic device, and update for transmitting the acquired update data to the other electronic device via a voice transmission line of the communication interface An electronic device comprising a data transmission means. A software update method by a software update system in which a first electronic device and a display device are connected via a communication interface, and the display device and a second electronic device are connected,
The first electronic device acquires update data for updating software of the second electronic device, and the acquired update data is transmitted to the first electronic device via the display device via an audio transmission line of the communication interface. And a step of transmitting to two electronic devices,
The second electronic device includes a step of updating software of the second electronic device with update data transmitted from the first electronic device via the display device. .

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