JP2010282603A - Software update system, display unit, and software update method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To quickly and easily update software, even in multiple electronic apparatus which are not provided with any broadcasting receiving function or network connecting function, in a system in which the multiple electronic apparatus are connected through a digital voice transmission line such as S/PDIF. <P>SOLUTION: In a software update system, a recorder 8 and a TV9 are HDMI connected, and a TV9 and an AV amplifier 2 are HDMI connected, and a recorder 8 and an AV amplifier 2 are connected through an S/PDIF line 3. The recorder 8 includes a tuner 81 for acquiring update data for updating the software of the AV amplifier 2 and an S/PDIF terminal 90 for transmitting the acquired update data through the S/PDIF line 3 to the AV amplifier 2. The AV amplifier 2 includes a controller 21 for updating the software of the AV amplifier with update data from the recorder 8. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a software update system for updating software of an electronic apparatus connectable via a digital audio transmission line such as S / PDIF (Sony / Philips Digital Interface), a display unit constituting the system, and software update Regarding the 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. A playback device constituting this system reads an update file from an optical disc, creates a vendor command indicating the content of the update file based on the HDMI (High Definition Multimedia Interface) standard, and creates the created vendor command from the HDMI port to the TV. Send to. 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 has a broadcast reception function, a network connection function, and the like in a system in which a plurality of electronic devices are connected via a digital audio transmission line such as S / PDIF. It is an object of the present invention to make it possible to update software quickly and easily even if there is no electronic device.

  In order to solve the above-mentioned problem, a first technical means is a software update comprising a display unit composed of a receiving device and a display device, and an electronic device connected to the receiving device via a digital audio transmission line. An update data acquisition means for acquiring update data for updating software of the electronic device, and an update for transmitting the acquired update data to the electronic device via the digital audio transmission line Data transmission means, and the electronic device includes software update means for updating software of the electronic device with update data transmitted from the reception device, and the reception device and the display device are connected via a communication interface. And the display device and the electronic device are further connected via a communication interface. Is obtained is characterized in that there.

  According to a second technical means, in the first technical means, the display unit includes identification information storage means for storing identification information of the electronic device and software version information, and the update data includes the identification information of the electronic device. Information and software version information are included, and when the software version information is newer than the version information stored in the identification information storage means, the update data transmission means transmits the update data to the digital audio transmission line via the digital audio transmission line. It is characterized by being transmitted to an electronic device.

  According to a third technical means, in the first technical means, the display unit includes identification information storage means for storing identification information of the electronic device and software version information, and the update data includes the identification information of the electronic device. Information and software version information are included, and when the software version information is newer than the version information stored in the identification information storage means, the user can select whether or not to update the software of the electronic device. When a selection screen is displayed and a user instructs to select software update on the selection screen, the update data transmission means transmits the update data to the electronic device via the digital audio transmission line. It is a thing.

  According to a fourth technical means, in the second or third technical means, the display unit identifies the electronic device from the electronic device by transmitting a predetermined command to the electronic device via the communication interface. Information and software version information are received and stored in the identification information storage means.

  According to a fifth technical means, in any one of the first to fourth technical means, the display unit transmits the update data to the electronic device via the digital audio transmission line via the communication interface. Then, a command for notifying that the update data is to be transmitted is transmitted to the electronic device.

  According to a sixth technical means, in the fifth technical means, the electronic device includes voice output means for outputting a voice signal transmitted from the display unit to a built-in speaker or an external speaker, from the time when the command is received. The audio output by the audio output means is muted until the update data transmission process is completed.

  A seventh technical means is any one of the first to sixth technical means, wherein the update data includes update data of the display unit and update data of one or more electronic devices connectable to the display unit. And is characterized by a combination.

  According to an eighth technical means, in any one of the first to seventh technical means, the display unit includes update data storage means for storing update data acquired by the update data acquisition means, and the update data transmission The update data in the update data storage unit is deleted after the transmission of the update data to the electronic device is completed by the unit.

  According to a ninth technical means, in any one of the first to eighth technical means, the electronic device includes update data memory means for storing update data transmitted from the display unit, and the software update means After the software update is completed, the update data in the update data memory means is deleted.

  A tenth technical means according to any one of the first to ninth technical means is characterized in that the display unit transmits dummy data added to the head of the update data.

  The eleventh technical means is characterized in that, in the tenth technical means, the data format of the dummy data is different from the data format of the update data.

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

  A thirteenth technical means is the twelfth technical means, wherein the electronic device detects a header of the update data from transmission data including dummy data and update data transmitted from the display unit; Update data extracting means for extracting update data of the electronic device based on the fixed data of the detected header, and storing the extracted update data in update data memory means provided in the electronic device It is.

  A fourteenth technical means is the electronic device according to the twelfth technical means, wherein the electronic device temporarily stores transmission data including dummy data and update data transmitted from the display unit, and stores the transmission data in the buffer memory. A header detection unit for detecting a header of the update data from the transmitted data, and an update data extraction unit for extracting the update data of the electronic device based on the fixed data of the detected header. Is stored in an update data memory means included in the electronic device.

  A fifteenth technical means according to any one of the first to fourteenth technical means is characterized in that the update data acquisition means is a reception means for receiving a broadcast wave including update data.

  In a sixteenth technical means according to any one of the first to fourteenth technical means, the update data acquiring means is connected to a server device storing the update data via a network, and receives the update data from the server device. It is a network connection means for downloading.

  According to a seventeenth technical means, in any one of the first to sixth technical means, the communication interface is HDMI, and the electronic device is a repeater device.

  An eighteenth technical means according to any one of the first to sixth technical means is characterized in that the communication interface is IEEE1394.

  A nineteenth technical means is any one of the first to eighteenth technical means, wherein the digital audio transmission line is an S / PDIF line.

  A twentieth technical means is a display unit constituting the software update system according to any one of the first to nineteenth technical means, and the display unit acquires update data for updating software of the electronic device. Update data acquisition means for executing the update data transmission means for transmitting the acquired update data to the electronic device via the digital audio transmission line.

  A twenty-first technical means includes a display unit composed of a receiving device and a display device, and an electronic device connected to the receiving device via a digital audio transmission line, and the receiving device and the display device communicate with each other. A software update method using a software update system in which the display device and the electronic device are further connected via a communication interface, and the receiving device updates the software of the electronic device. Obtaining the update data to be transmitted, and transmitting the obtained update data to the electronic device via the digital audio transmission line, wherein the electronic device sends software of the electronic device from the receiving device. It is characterized by comprising a step of updating with the transmitted update data.

  According to the present invention, in a system in which a plurality of electronic devices are connected via a digital audio transmission line such as S / PDIF, update data is transmitted using the digital audio transmission line. Even an electronic device having no function can update software 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 TV 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 TV. It is a figure for demonstrating the other example of the update data acquisition method of AV amplifier by TV. It is a flowchart for demonstrating the operation example of TV 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 from TV to AV amplifier. 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 the other reference example of this invention. It is a block diagram which shows the structural example of the recorder shown in FIG. 12, TV, and AV amplifier. 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. 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. 18, TV, and AV amplifier.

  Hereinafter, preferred embodiments according to a software updating system, a display unit, and a software updating 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. In addition, although S / PDIF is illustrated as a digital audio transmission line and HDMI is illustrated as a communication interface, the present invention is not limited to these.

  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 TV (television), 2 denotes an AV amplifier, 3 denotes an S / PDIF cable, and 4 denotes an HDMI cable. The display unit of this reference example is composed of the TV 1 and is called a sink device in the HDMI standard. The AV amplifier 2 corresponds to an electronic device, and is called a repeater device in the HDMI standard. In the present embodiment, the TV 1 and the AV amplifier 2 will be described based on a system configuration in which HDMI connection and S / PDIF connection are performed. That is, the TV 1 and the AV amplifier 2 are connected by the S / PDIF cable 3 (hereinafter referred to as the S / PDIF line 3) and the HDMI cable 4.

  Audio transmission through the S / PDIF line 3 is performed by an optical digital audio terminal or a coaxial digital terminal included in each device. The audio transmission method and connection terminal by S / PDIF are standardized by IEC60958 and EIAJRC-5720B. Also, the HDMI cable 4 has a TMDS (Transition Minimized Differential Signaling) line (digital signal line) for transmitting a video / audio signal, which is a digital signal, in a differential manner, and a control signal (CEC message) that is common between devices. And a CEC line, which is a bidirectional bus for transmitting. 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 TV 1 and the AV amplifier 2 shown in FIG. In the figure, a TV 1 receives a tuner 11 that receives a broadcast wave 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 wave received by the tuner 11. An update data extraction unit 13 to extract, a controller 14 for controlling the operation of the TV 1, a flash memory 15 as an example of a nonvolatile memory for storing various data such as update data, and an input of the S / PDIF terminal 19 to the flash memory 15 or a video / audio reproduction unit 17 that selectively switches to the video / audio reproduction unit 17, a video / audio reproduction unit 17 that reproduces a video signal and an audio signal acquired by the tuner 11 or the communication unit 12, and a video from the AV amplifier 2. Receives signals and audio signals, and sends and receives CEC messages to and from the AV amplifier 2 Includes an HDMI receiving section 18, and a S / PDIF terminal 19 which is an example of a digital audio transmission interface for transmitting audio signals to the AV amplifier 2 via the S / PDIF line 3.

  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 TV 1. Update data extraction unit 24 that extracts update data to be transmitted, audio signal processing unit 25 that processes an audio signal transmitted from TV 1, a video signal and an audio signal are transmitted to TV 1, and a CEC message is transmitted to TV 1. An HDMI transmission unit 26 that transmits and receives each other and an S / PDIF terminal 27 that receives an audio signal from the TV 1 via the S / PDIF line 3 are provided.

  The AV amplifier 2 can connect a source device (not shown) such as a recorder, and receives an image signal and an audio signal from the source device, and an HDMI receiving unit that transmits and receives CEC messages to and from the source device. The description is omitted here. The AV amplifier 2 is an electronic device that does not have the tuner 11 or the communication unit 12.

  The main characteristic part of the present invention is that in a system in which a plurality of electronic devices are connected via a digital audio transmission line such as S / PDIF, even if the electronic device does not have a broadcast receiving function or a network connection function, the software The purpose of this is to make it possible to quickly and easily perform the update. As a configuration for this, the TV 1 uses the tuner 11 or the communication unit 12 corresponding to update data acquisition means for acquiring update data for updating the software of the AV amplifier 2, and the acquired update data via the S / PDIF line 3. An S / PDIF terminal 19 corresponding to update data transmission means for transmission to the AV amplifier 2 is provided. The AV amplifier 2 includes a controller 21 corresponding to software update means for updating the software of the AV amplifier 2 with the update data transmitted from the TV 1.

  In the following description, firmware will be described as an example of 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 1 includes a flash memory 15 corresponding to an identification information storage unit that stores 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, the TV 1 is newer than the version information stored in the flash memory 15. Then, a selection screen for allowing the user to select whether or not to update the firmware of the AV amplifier 2 is displayed. When the user instructs to update the firmware on the selection screen displayed on the TV 1, the controller 14 switches the changeover switch 16 to the flash memory 15 side, and the update data stored in the flash memory 15 is transferred to the S / S. The data is transmitted to the AV amplifier 2 through the S / PDIF line 3 of the PDIF terminal 19.

  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 TV 1 receives the update data received by the tuner 11 as an AV amplifier. It is determined whether or not the update data has the identification information 2, and whether or not the version information of the firmware is newer than the version information stored in the flash memory 15. The TV 1 is update data having identification information of the AV amplifier 2, and stores the update data in the flash memory 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 TV 1 needs to hold the identification information of the AV amplifier 2 and the firmware version information in advance. For example, when the TV 1 is started, a predetermined CEC message is transmitted to the AV amplifier 2. Thus, the identification information and firmware version information may be received from the AV amplifier 2 and stored in the flash memory 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 TV 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 selection screen for whether or not to update the firmware of the AV amplifier 2 is displayed on the TV 1 and the firmware update process is performed based on a user instruction. ing. During the firmware update process, it is preferable to perform a caution display for notifying the user of the fact, and the TV 1 can display various UI (user interface) screens and caution screens.

  Since the physical transmission rate of the S / PDIF line 3 can be about 1,536 Mbps (16 bits × 2 ch × 48 kHz fs) or more, if the firmware data capacity of the AV amplifier 2 to be updated is about 1 MB, data transmission is required. The time is 8,000,000 (bits) / 1,536 M (bps) ≈5.2 seconds. As described above, by using the S / PDIF line 3, it is possible to significantly reduce the transmission time of update data as compared with the case of using the CEC line described above, and the level is sufficiently practical. I understand.

  Various timings for updating the firmware of the AV amplifier 2 are conceivable, for example, when the TV 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 TV 1 determines whether or not 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 flash memory 15. If the version information of the update data is newer, the controller 14 switches the changeover switch 16 to the flash memory 15 side, and the update data stored in the flash memory 15 is automatically sent to the AV amplifier 2 by the S / PDIF line 3. Transmit. The AV amplifier 2 automatically updates its own firmware with the update data transmitted from the TV 1. In the case of automatic update, there is no need to display a UI screen or a caution screen to the user.

  FIG. 3 is a diagram for explaining an example of a method for acquiring update data of the AV amplifier 2 by the TV 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 TV 1, and firmware data 53 of the AV amplifier 2. First, the TV 1 acquires the update firmware data 5 including the firmware data 52 of the TV 1 and the firmware data 53 of the AV amplifier 2 by broadcast waves and stores it in the flash memory 15. In the header 51, model names and firmware version information of the TV 1 and the AV amplifier 2 are described.

  When the user activates the TV 1 or when there is an instruction to update the AV amplifier 2 by a user operation, the TV 1 uses the CEC message or the like to make a model name and a name from the AV amplifier 2 currently connected to the TV 1. Get firmware version information. Then, the TV 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 described version information is newer, the update firmware data 5 is stored in the flash memory 15 and the update 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 flash memory 15.

  In the example of FIG. 3, the update firmware data 5 may be a combination of the update data of one or more AV amplifiers connectable to the TV 1 with the update data of the TV 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 TV 1. For example, if there are five types of AV amplifiers that can be connected to the TV 1, five pairs of update firmware data are described. If there are two types of AV amplifiers connected to the TV 1, the TV 1 only needs to acquire update firmware data for the TV 1 and update firmware data for the two corresponding AV amplifiers. As with the AV amplifier 2, the TV 1 can update the firmware of the TV 1 with the obtained update firmware data by the controller 14.

  In the above example, in the configuration example of FIG. 2, one AV amplifier 2 is connected to the TV 1, but the same processing is possible even if a plurality of repeater devices such as AV amplifiers or switchers are connected in a hierarchical manner. . 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.

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

  Then, the TV 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 TV 1 and the 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 TV 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 the version information described in the upgrade management file is more If it is new, 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 TV 1 to the AV amplifier 2 or firmware update in the AV amplifier 2 in FIG. 2 will be described below.

  The TV 1 stores the update data acquired by the tuner 11 in a flash memory 15 corresponding to update data storage means. Then, the TV 1 deletes the update data in the flash memory 15 after the transmission of the update data to the AV amplifier 2 by the S / PDIF terminal 19 is completed. According to this, even if a failure such as a power failure occurs during transmission of update data and the transmission process is interrupted, the update data is stored in the flash memory 15, and therefore the transmission process is performed again after the failure is recovered. Can do.

  The AV amplifier 2 stores the update data transmitted from the TV 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 TV 1 in the software update system shown in FIG. First, the TV 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 that of the AV amplifier 2. If it is not 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 process proceeds to normal operation. 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 flash memory 15. Save (step S2).

  Next, the TV 1 displays an update selection screen for allowing the user to select whether or not to update the firmware of the AV amplifier 2 (step S3). If the user does not select the update process on the update selection screen of TV1 (in the case of NO), the update selection screen is displayed again at a predetermined interval or when the power is turned off while returning to step S3 and performing normal operation. To display. In step S3, when the user selects update processing on the update selection screen of TV1 (in the case of YES), a CEC message for notifying that update data is to be transmitted is transmitted to the AV amplifier 2 (step S4). ). Then, the TV 1 starts transmission of update data to the AV amplifier 2 through the S / PDIF line 3 (step S5).

  In steps S <b> 4 and S <b> 5, the TV 1 transmits a CEC message for notifying that the update data is transmitted to the AV amplifier 2 before transmitting the update data to the AV amplifier 2 through the S / PDIF line 3. 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 audio output means for outputting an audio signal transmitted from the TV 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 the update data is transmitted using the S / PDIF line for originally transmitting the audio signal, if the update data is reproduced by mistake, the user may feel uncomfortable, The speaker may be damaged. For this reason, this is prevented by muting the audio output.

  In FIG. 5, the TV 1 determines whether or not the update data transmission process has been completed normally (step S <b> 6). If the transmission process has not been completed normally due to a failure such as a power failure (NO), the step is performed. Returning to S3, an update selection screen is displayed after failure recovery. In step S6, when the transmission process ends normally (in the case of YES), the update data stored in the flash memory 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 update data is to be transmitted is received from the TV 1 (step S11). When the CEC message is not received (in the case of NO), it is normal. Move to operation. In step S11, when a CEC message is received (in the case of YES), update data transmitted from the TV 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 normally completed (step S13). If the reception has been normally completed (in the case of YES), the AV amplifier 2 indicates that the reception has been successful. Notification is made (step S14). In step S13, if the reception has not been completed normally (in the case of NO), an error is displayed on the screen of the TV 1 (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 a broadcast wave (S21), and the TV 1 receives the broadcast wave and stores the update data of the AV amplifier 2 in the flash memory 15 (S22). When the user permits updating of the firmware of the AV amplifier 2 on the update selection screen, the TV 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 TV 1 (S24).

  Next, the TV 1 transmits the update data stored in the flash memory 15 to the AV amplifier 2 via the S / PDIF line 3 (S25). The AV amplifier 2 stores the update data transmitted from the TV 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 TV 1 (S28). When receiving the data reception completion response from the AV amplifier 2, the TV 1 discards the update data in the flash memory 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, since the data and the transmission clock are extracted from the transmission waveform on the S / PDIF line 3, the 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 S / PDIF line 3, the head portion of the update data may be lost.

  As the above countermeasure, the TV 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. For example, the dummy data is generated by the controller 14 of the TV 1, and the dummy data is added to the head of the update data 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 illustrating an example of a format of update data transmitted from the TV 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 transmitted from the TV 1, the controller 21 switches the changeover switch 28 from “normal operation” to “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 TV 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 transmitted from the TV 1, similarly to the configuration of FIG. 10, the controller 21 changes the changeover switch 28 from “normal operation” to “update”. Switch 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 TV 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.

  FIG. 12 is a diagram showing an example of a software update system according to another reference example of the present invention. The display unit of this reference example includes a recorder 8 that is an example of a receiving device and a TV 9 that is an example of a display device, and the recorder 8 and the TV 9 are HDMI-connected. The TV 9 and the AV amplifier 2 are HDMI-connected and connected via the S / PDIF line 3. In this reference example, the recorder 8 transmits the update data to the TV 9 through the audio transmission line in the HDMI standard, and the TV 9 transmits the update data to the AV amplifier 2 through the S / PDIF line 3. The recorder 8 corresponds to a source device in the HDMI standard.

  FIG. 13 is a block diagram illustrating a configuration example of the recorder 8, the AV amplifier 2, and the TV 9 illustrated in FIG. In the figure, a recorder 8 includes a tuner 81 that receives broadcast waves via an antenna, a communication unit 82 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 81. An update data extraction unit 83 for extracting data, a controller 84 for controlling the operation of the recorder 8, an HDD (Hard Disk Drive) 85 for storing various data such as update data, and a video signal acquired by the tuner 81 or the communication unit 82 And an audio signal processing unit 87 for processing an audio signal acquired by the tuner 11 or the communication unit 12.

  The recorder 8 writes the video signal output from the video signal processing unit 86 and the audio signal output from the audio signal processing unit 87 on an optical disc such as a BD / DVD, and the video signal recorded on the optical disc and An optical disk drive unit 88 that reads audio signals and an HDMI transmission unit 89 that transmits video signals and audio signals to the TV 9 and transmits and receives CEC messages to and from the TV 9 and the AV amplifier 2 are provided. The HDMI transmission unit 89 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 TV 9 is connected to the HDMI transmission unit 89 of the recorder 8 via the HDMI cable 4 and the HDMI transmission unit 26 of the AV amplifier 2 via the HDMI cable 4. 2 HDMI receivers 92, a signal selector 93 that selectively outputs one of the inputs from the first HDMI receiver 91 and the second HDMI receiver 92, “normal operation mode” and “ A switch 94 for switching between “firmware update processing mode”, a video / audio reproduction unit 95 for reproducing video signals and audio signals, a controller 96 for controlling the operation of the TV 9, and an S / PDIF line 3 connected to the S / PDIF line 3 And a terminal 97. Note that the description of the tuner circuit of the TV 9 is omitted.

  Specifically, in FIG. 13, the HDMI transmission unit 89 of the recorder 8 relays the update data to the TV 9 via the HDMI audio transmission line and further transmits the update data to the AV amplifier 2 via the S / PDIF line 3. Is transmitted to the TV 9 and the AV amplifier 2. When the TV 9 receives the CEC message from the recorder 8, the signal selector 93 selects the input from the first HDMI receiving unit 91, the controller 96 controls the changeover switch 94, and sets the changeover switch 94 to “data transmission in progress”. Switch to the "" side. Then, the TV 9 transmits the update data received from the recorder 8 to the AV amplifier 2 via the S / PDIF line 3 through the S / PDIF terminal 97.

  FIG. 14 is a flowchart for explaining an operation example of the recorder 8 in the software update system shown in FIG. First, the recorder 8 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, 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 85. (Step S42).

  Next, the recorder 8 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 9 through the video transmission line in the HDMI standard, and displays the update selection screen on the TV 9 ( Step S43). When the user does not select the update process on the update selection screen of TV 9 (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, if the user selects an update process on the update selection screen of the TV 9 (in the case of YES), a CEC message for notifying that the update data is transmitted is transmitted to the TV 9 and the AV amplifier 2 ( Step S44). Then, the recorder 8 starts transmission of update data to the TV 9 through the audio transmission line in the HDMI standard (step S45).

  In steps S44 and S45, the HDMI transmission unit 89 of the recorder 8 transmits a CEC message for notifying that the update data is to be transmitted before the update data is transmitted to the TV 9 via the HDMI audio transmission line. 2 to send. At this time, the TV 9 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 8 determines whether or not the transmission process of the update data has been completed normally (step S46), and if the transmission process has not been completed 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 9 after failure recovery. In step S46, when the transmission process ends normally (in the case of YES), the update data stored in the HDD 85 is deleted and the process ends (step S47).

  FIG. 15 is a flowchart for explaining an operation example of the TV 9 in the software update system shown in FIG. First, the TV 9 determines whether or not a CEC message for notifying that update data is to be transmitted has been received from the recorder 8 (step S51). When the CEC message has not been 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 93 selects an input from the first HDMI receiving unit 91 (step S53). ). Then, the selector switch 94 is switched to the “data transmission” side, that is, the S / PDIF terminal 97 side (step S54).

  Next, the TV 9 transmits the update data received from the recorder 8 to the AV amplifier 2 via the S / PDIF line 3 (step S55), and determines whether or not the transmission of the update data has been normally completed (step S55). S56). Here, when the transmission of the update data is normally completed (in the case of YES), the changeover switch 94 is switched to the “normal operation” side (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 8 (step S61). When the CEC message is not received (in the case of NO), Move to normal operation. If a CEC message is received in step S61 (in the case of YES), update data transmitted from the TV 9 via the S / PDIF line 3 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), and if the reception has been normally completed (in the case of YES), the AV 9 and the TV 9 and The recorder 8 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 9 (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 8 receives the broadcast wave and stores the update data of the AV amplifier 2 in the HDD 85 (S72). When the user permits updating of the firmware of the AV amplifier 2 on the update selection screen, the recorder 8 transmits a CEC message for notifying that the update data is transmitted to the TV 9 and the AV amplifier 2 ( S73).

  When the TV 9 receives the CEC message from the recorder 8, the audio output is muted (S74), and the signal selector 93 selects the input from the first HDMI receiving unit 91 (S75). Then, the TV 9 switches the selector switch 94 to the “data transmitting” side (S76). Then, the TV 9 and the AV amplifier 2 return a response to this CEC message to the recorder 8 (S77).

  Next, the recorder 8 transmits the update data stored in the HDD 85 to the TV 9 through the HDMI audio transmission line, and the TV 9 transmits the update data received from the recorder 8 to the AV amplifier 2 through the S / PDIF line 3 (S78). ). The AV amplifier 2 stores the update data transmitted from the recorder 8 via the TV 9 in the flash memory 22 (S79), and detects the end of the update data (S80). Return to 8 (S81). When receiving the data reception completion response from the AV amplifier 2, the recorder 8 discards the update data in the HDD 85 (S82).

  Then, the TV 9 switches the changeover switch 94 to the “normal operation” side (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).

(Embodiment of the present invention)
FIG. 18 is a diagram illustrating an example of a software update system according to an embodiment of the present invention. The display unit of the present embodiment includes a recorder 8 and a TV 9, and the recorder 8 and the TV 9 are HDMI-connected. The TV 9 and the AV amplifier 2 are HDMI-connected, and the recorder 8 and the AV amplifier 2 are connected via the S / PDIF line 3. The recorder 8 transmits the update data to the AV amplifier 2 through the S / PDIF line 3.

  FIG. 19 is a block diagram illustrating a configuration example of the recorder 8, the AV amplifier 2, and the TV 9 illustrated in FIG. The difference from the system configuration in the above-described reference example (FIGS. 12 and 13) is that the recorder 8 has an S / PDIF terminal 90 and the AV amplifier 2 has another S / PDIF terminal 28 different from the S / PDIF terminal 27. The recorder 8 and the AV amplifier 2 are connected by the S / PDIF line 3. That is, in the above-described reference example, the recorder 8 transmits the update data to the TV 9 via the HDMI audio transmission line. However, in this embodiment, the update data is transmitted from the recorder 8 to the AV amplifier 2 in the S / PDIF line 3. It is transmitted directly via. At this time, the audio output by the HDMI of the recorder 8 is muted.

  As described above, the S / PDIF is exemplified as the digital audio transmission line, but the present invention is not limited to this S / PDIF. Although the HDMI is exemplified as the communication interface, the present invention is not limited to the HDMI, and can be applied to all communication interfaces having an audio transmission line such as IEEE1394.

DESCRIPTION OF SYMBOLS 1,9 ... TV, 2 ... AV amplifier, 3 ... S / PDIF line, 4 ... HDMI cable, 5 ... Update firmware data, 6 ... Server apparatus, 7 ... Broadcasting station, 8 ... Recorder, 11,81 ... Tuner, DESCRIPTION OF SYMBOLS 12,82 ... Communication part, 13, 24, 83 ... Update data extraction part, 14, 21, 84, 96 ... Controller, 15, 22 ... Flash memory, 16, 94 ... Changeover switch, 17, 95 ... Video / audio reproduction , 18 ... HDMI receiver, 19, 27, 28, 90, 97 ... S / PDIF terminal, 23 ... audio amplifier, 25, 87 ... audio signal processor, 26, 89 ... HDMI transmitter, 28 ... changeover switch, DESCRIPTION OF SYMBOLS 29 ... Buffer memory, 30, 32 ... Header detection part, 33 ... Update data writing part, 85 ... HDD, 86 ... Video signal processing part, 88 ... Optical disk drive part, 91 ... 1st HDMI receiving unit, 92 ... second HDMI receiving unit, 93 ... signal selector.

Claims (21)

A software update system comprising a display unit composed of a receiving device and a display device, and an electronic device connected to the receiving device via a digital audio transmission line,
The receiving device includes update data acquisition means for acquiring update data for updating software of the electronic device, and update data transmission means for transmitting the acquired update data to the electronic device via the digital audio transmission line. Prepared,
The electronic device includes software updating means for updating software of the electronic device with update data transmitted from the receiving device,
The software update system, wherein the receiving device and the display device are connected via a communication interface, and the display device and the electronic device are further connected via a communication interface.   2. The software update system according to claim 1, wherein the display unit includes an identification information storage unit that stores identification information of the electronic device and software version information, and the identification information and software of the electronic device are included in the update data. If the version information of the software is newer than the version information stored in the identification information storage means, the update data transmission means transmits the update data to the electronic device via the digital audio transmission line. A software update system characterized by transmitting.   2. The software update system according to claim 1, wherein the display unit includes an identification information storage unit that stores identification information of the electronic device and software version information, and the identification information and software of the electronic device are included in the update data. A selection screen for allowing the user to select whether or not to update the software of the electronic device when the version information of the software is newer than the version information stored in the identification information storage means. And the update data transmission means transmits the update data to the electronic device via the digital audio transmission line when a user instructs to update the software on the selection screen. system.   4. The software update system according to claim 2, wherein the display unit transmits a predetermined command to the electronic device via the communication interface, whereby the identification information and software of the electronic device are transmitted from the electronic device. A software update system for receiving version information and storing it in the identification information storage means.   5. The software update system according to claim 1, wherein the display unit transmits the update data via the communication interface before transmitting the update data to the electronic device via the digital audio transmission line. 6. A software update system, wherein a command for notifying that data is to be transmitted is transmitted to the electronic device.   6. The software update system according to claim 5, wherein the electronic device includes audio output means for outputting an audio signal transmitted from the display unit to a built-in speaker or an external speaker, and the update data from the time when the command is received. The software update system is characterized in that the audio output by the audio output means is muted until the transmission process is completed.   The software update system according to any one of claims 1 to 6, wherein the update data is a combination of update data of the display unit and update data of one or more electronic devices connectable to the display unit. Software update system characterized by that.   The software update system according to any one of claims 1 to 7, wherein the display unit includes update data storage means for storing update data acquired by the update data acquisition means, and the update data transmission means performs the update data storage means. A software update system for deleting update data from the update data storage means after transmission of update data to an electronic device is completed.   9. The software update system according to claim 1, wherein the electronic device includes update data memory means for storing update data transmitted from the display unit, and the software update means updates the software. A software update system for deleting update data from the update data memory means after completion of the process.   10. The software update system according to claim 1, wherein the display unit transmits the update data with dummy data added to a head of the update data. 11.   11. The software update system according to claim 10, wherein a data format of the dummy data is different from a data format of the update data.   11. The software update system according to claim 10, wherein fixed data including identification information of the electronic device is added to a header of the update data.   13. The software update system according to claim 12, wherein the electronic device detects a header of the update data from transmission data including dummy data and update data transmitted from the display unit, and the detected header. An update data extracting means for extracting update data of the electronic device based on the fixed data of the electronic device, and storing the extracted update data in an update data memory means provided in the electronic device.   13. The software update system according to claim 12, wherein the electronic device temporarily stores transmission data including dummy data and update data transmitted from the display unit, and transmission stored in the buffer memory. Header detection means for detecting a header of the update data from the data, and update data extraction means for extracting update data of the electronic device based on the fixed data of the detected header, the extracted update data being the electronic data A software update system characterized in that it is stored in an update data memory means provided in the device.   15. 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.   15. The software update system according to claim 1, wherein the update data acquisition unit 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, and the electronic device is a repeater device.   The software update system according to any one of claims 1 to 6, wherein the communication interface is IEEE1394.   The software update system according to any one of claims 1 to 18, wherein the digital audio transmission line is an S / PDIF line. A display unit constituting the software update system according to any one of claims 1 to 19,
The display unit includes update data acquisition means for acquiring update data for updating software of the electronic device, and update data transmission means for transmitting the acquired update data to the electronic device via the digital audio transmission line. A display unit characterized by that. A display unit comprising a receiving device and a display device, and an electronic device connected to the receiving device via a digital audio transmission line, the receiving device and the display device being connected via a communication interface A software update method by a software update system in which the display device and the electronic device are further connected via a communication interface,
The receiving device comprises the steps of acquiring update data for updating software of the electronic device, and transmitting the acquired update data to the electronic device via the digital audio transmission line;
A software update method comprising: a step in which the electronic device updates software of the electronic device with update data transmitted from the receiving device.

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