JP2012138933A - Communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correctly perform physical address conversion even when an HDMI path having a plurality of sink devices mixed therein is relayed via radio etc.SOLUTION: A communication system includes an address management unit 338 which executes the processing of: acquiring a first physical address allocated to a relay device with a sink device as a reference; acquiring a second physical address allocated to a relay device with another sink device connected to downstream of another relay device as a reference; performing first discrimination for discriminating whether or not a command is required to be transferred to the another relay device; performing second discrimination for discriminating whether or not the physical address included in a parameter is converted on the another relay device when it is determined that the command is required to be transferred to the another relay device; and performing conversion of the physical address included in the parameter into a physical address with the another sink device as a reference, using the first physical address and the second physical address, on determination that the physical address conversion is not performed on the another relay device,.

Description

  The present invention relates to a communication system that relays transmission of a video stream.

  Currently, the High-Definition Multimedia Interface (HDMI) standard is being used for transmission of video signals and audio signals between a television and a recording apparatus.

  Japanese Patent Application Laid-Open No. 2004-133620 discloses a technique for requesting a physical address from a device on an HDMI network and acquiring and managing a connection state between the display device and an external device.

  Patent Document 2 discloses that an AV amplifier, which is a repeater device connected to a display device having only one HDMI input in a display system, has two input terminals and serves as a relay device. Yes.

JP 2008-35190 A JP 2008-34976 A

  The conventional technology can only support transmission between devices on the transmission line B (Native), or transmission through the transmission line B in a one-to-one connection (Pass Through). When there is a sink device (such as a TV), physical address conversion cannot be performed well, and path control and video stream transmission cannot be performed.

  An object of the present invention is to provide a communication system capable of correctly performing physical address conversion between a plurality of systems each having a sink device and a source device.

  A communication system including a first sink device that displays an input video according to an example of the present invention includes a communication unit that communicates with another communication system including a second sink device, and the first sink device. Receiving means for receiving a first command including a first physical address in a parameter transmitted from a source device to which a reference address is assigned; and when transferring the command to the other communication system, Conversion means for converting the first physical address therein into a second physical address based on the second sink device, wherein the communication means sends a second command including the second physical address to the other command. To the communication system.

  According to another example of the present invention, a communication system including a first sink device that displays input video includes communication means for communicating with another communication system including a second sink device, and the first sink. Receiving means for receiving a command transmitted from a source device to which an address based on the device is assigned and including a first physical address based on the first sink device as a parameter; and the communication means , When transferring the command to the other communication system, information on the request for converting the first physical address into a physical address based on the second sink device and the command are transmitted to the other communication system. To do.

  According to the present invention, it is possible to correctly perform physical address conversion between a plurality of systems each having a sink device and a source device.

Schematic which shows the HDMI system installed in each of the living room and study concerning one Embodiment of this invention. 1 is a block diagram showing an example of an HDMI system configuration according to an embodiment of the present invention. The figure for demonstrating the concept of the upstream and downstream of an HDMI relay apparatus. The figure explaining the concept of the upstream and downstream of an HDMI relay apparatus in the case of receiving a stream via a relay area. The figure explaining the concept of the upstream and downstream of an HDMI relay apparatus in the case of transmitting a stream via a relay area. The figure explaining the difference of the physical address on the basis of each TV in the system configuration | structure of this embodiment shown in FIG. The block diagram which shows the outline of the HDMI relay apparatus concerning one Embodiment of this invention. The flowchart which shows the physical address notification method of the HDMI relay apparatus concerning one Embodiment of this invention. The figure which shows the transmission method of the address information of the address management part of the HDMI relay apparatus used for physical address conversion concerning one Embodiment of this invention. 9 is a flowchart showing a physical address conversion processing method in the address management unit of the HDMI relay device on the command transmission side. The figure which shows an example of command transfer availability judgment concerning one Embodiment of this invention. The flowchart which shows the address conversion method in one Embodiment of this invention. The figure used for description of the address translation method in one Embodiment of this invention. The figure which shows the 1st example of the address conversion process concerning one Embodiment of this invention. The figure used for description of the specific example of the address translation method. The figure which shows the 2nd example of the address conversion process concerning one Embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a schematic diagram showing a high-definition multimedia interface (HDMI) system installed in each of a living room and a study according to an embodiment of the present invention.

  First, the HDMI system 100 installed in the living room will be described. The HDMI system 100 reproduces media such as the television 1, which is an electronic device that receives and displays a digital terrestrial broadcast wave from an antenna, demodulates and displays it, or receives and displays a video signal from an external input, a relay device, and a DVD. It has a DVD player 111 and an HDD (Hard Disk Drive) recorder 122 that records video signals from broadcasting and external input and can output the recorded content to the outside.

  The television and the relay device are connected by an HDMI cable. The relay device and the DVD player are connected by an HDMI cable. The relay device and the HDD recorder are connected by an HDMI cable. The HDMI cable is used for transmission of video signals and audio signals based on the HDMI standard. Further, a CEC line for transmitting a signal compliant with the CEC standard is provided in the HDMI cable. The CEC standard is a serial communication protocol that enables mutual control of HDMI connected devices via one terminal (CEC terminal) in the HDMI terminal.

  The television 101 confirms the connection with each electronic device connected by the HDMI cable 121 when the television 101 is turned on and periodically during normal operation. Transmission / reception of connection confirmation information is performed using a command line in the HDMI cable.

  Next, the HDMI system 200 installed in the living room will be described. The HDMI system 200 reproduces media such as the television 1, which is an electronic device that receives and displays a digital terrestrial broadcast wave from an antenna, demodulates and displays it, or receives and displays a video signal from an external input, a relay device, and a DVD. A personal computer 211 capable of reproducing and recording video signals from broadcasting and external inputs and outputting the recorded contents to the outside. Each is configured by connecting with an HDMI cable 221 as illustrated.

FIG. 2 is a block diagram showing an example of an HDMI system configuration according to an embodiment of the present invention.
In this system configuration, one TV is provided in each of the living room and the study, and is connected to HDMI devices such as a DVD player 111, a DVD recorder 112, and a notebook personal computer 211 via an HDMI relay device. The HDMI paths in the living room and the study are connected to each other by wireless connection or the like via the HDMI relay device. In this embodiment, the HDMI relay apparatuses are connected wirelessly, but a wired connection may be used.

  FIG. 3 is a diagram illustrating the upstream and downstream concepts of the HDMI relay device.

  HDMI has directionality in transmission of a video stream, and a video stream flows from an HDMI output of a source device such as a DVD player to an HDMI input of a TV (sink device). At this time, the flow of the video stream is compared to the flow of the river, and when viewed from the HDMI relay apparatus, the side on which the video stream flows is called downstream, and the side on which the video stream flows is called upstream.

  FIG. 4 is a diagram for explaining the concept of upstream and downstream of the HDMI relay apparatus when a stream is received via the relay section. Both transmissions are possible on the relay path, and in the example of FIG. 4, a video stream flows from the Note PC to the living TV. In this case, the relay path side into which the video stream flows is referred to as upstream, and the HDMI path side to flow out to the TV is referred to as downstream.

  FIG. 5 is a diagram for explaining the concept of upstream and downstream of the HDMI relay apparatus when a stream is transmitted via a relay section. The relay path can be transmitted in both directions, and in the example of FIG. 5, a video stream flows from the DVD player to the study TV. In this case, the HDMI path side on which the video stream flows is called upstream, and the HDMI path side on which the video stream flows is called downstream.

  FIG. 6 is a diagram for explaining a difference in physical address based on each TV in the system configuration of the present embodiment shown in FIG.

  The physical address is represented by the number of stages of connection from the TV (the number of digits of the physical address) and the terminal number of each connection starting from the TV having the physical address of 0.0.0.0. For example, when the living TV shown in FIG. 2 is used as a reference, the physical address of the HDMI relay apparatus connected to the HDMI input 1 of the living TV is 1.0.0.0 with the first digit being 1, and similarly the HDMI relay apparatus. The physical address of the DVD Recorder connected to the HDMI input 2 is expressed as 1.2.0.0 by setting the second digit to 2 from the address of the HDMI relay device. Thus, since the physical address is set starting from the TV address 0.0.0.0, when a plurality of TVs are connected via the HDMI relay device as shown in FIG. 2, the living TV is the starting point. The physical address (1.2.0.0) of the DVD Recorder set to 1 and the physical address (1.2.2.0) of the DVD Recorder set based on the study TV show different values. In order to correctly perform video stream transmission control (path control) using the physical address from the study TV, it is necessary to correctly perform address conversion between HDMI relay apparatuses.

FIG. 7 is a block diagram showing an outline of an HDMI relay apparatus according to an embodiment of the present invention.
The HDMI relay devices 110 and 210 have an HDMI input 1, an HDMI input 2, and an HDMI input 3. The HDMI input 1 has an address line 301, a command line 311 and the like. The HDMI input 2 has an address line 302, a command line 312 and the like. The HDMI input 3 has an address line 303, a command line 313, and the like.

  Although FIG. 7 shows an example in which the HDMI input terminal is three terminals, the number of terminals may be other than three.

  Also, the HDMI relay apparatuses 110 and 210 have EDID (Extended Display Identification Data) 321, EDID 322, EDID 323, and the like. An address line 301 for HDMI input 1 is connected to the EDID 321. An HDMI input 2 address line 302 is connected to the EDID 322. An address line 303 for HDMI input 3 is connected to the EDID 323. Each EDID 321 to 323 describes a physical address to be used by a source device connected to the HDMI input.

  The HDMI relay apparatuses 110 and 210 also include an HDMI switch unit 330, an HDMI reception unit 331, an HDMI transmission unit 332, a switch control unit 334, a CEC command control unit 335, a command processing unit 336, an AVC command control unit 337, and an address management unit. 338, a video transfer unit 339, a wireless MAC (Media Access Control) unit 340, a wireless PHY (PHYsical) unit 341, and the like.

  The HDMI switch unit 330 selects one of the video streams input from the HDMI input terminals 1 to 3 and transmits the selected video stream to the HDMI receiving unit 331. The HDMI receiving unit 331 executes reception processing for the transmitted video stream, and sends the processed signal to the video transmission unit 339. Examples of processing performed by the HDMI receiving unit 331 include decryption processing of an encrypted video stream and metadata acquisition processing in the video stream.

  The video transmission unit 339 transmits the received signal to the wireless MAC unit 340 or the HDMI transmission unit 332. The wireless MAC unit 340 determines a transmission time point and a transmission order of packets transmitted from the wireless PHY unit 341. The wireless PHY unit 341 transmits to the HDMI relay device of the connection destination according to the transmission time and the transmission order in the wireless PHY unit 341. On the other hand, the video stream transmitted from the connected HDMI relay device is received by the wireless PHY unit 341 and the wireless MAC unit 340 and transferred to the HDMI transmission unit 332 via the video transmission unit.

  The physical address information acquired from the downstream device via the HDMI output address line is received by the address management unit 338 via the HDMI transmission unit 332, and after being subjected to address processing, set to EDID 1 to 3 respectively. The In the address management unit 338, the terminal number of the connection between the HDMI relay apparatuses is set to the number of HDMI input terminals + 1. A specific example of address processing is HDMI Specification 1.3a ("High-Definition Multimedia Interface Specification Version 1.3a" Hitachi, Ltd./Matsushita Electric Industrial Co., Ltd. / Philips Consumer Electronics, International BV / Silicon Image, Inc. / Sony Corporation / Thomson Inc./Toshiba Corporation November 10, 2006).

  The CEC command received from the HDMI inputs 1 to 3 or the HDMI output is passed to the CEC command control unit 335 via the command lines 311 to 314. The contents of the CEC command are passed to the command processing unit 336 and appropriate processing is performed.

  On the other hand, the command received via the wireless PHY unit 341 and the wireless MAC unit 340 is similarly passed to the command processing unit 336 via the AVC command control unit 337. The command processing unit 336 performs appropriate processing according to the contents of the command received via the CEC command control unit 335 and the AVC command control unit 337, issues an instruction to the address management unit 338 and the HDMI switch unit 330, and performs CEC command control. Processing such as command transmission is performed via the unit 335 and the AVC command control unit 337.

  In this block, the wireless MAC unit 340 and the wireless PHY unit 341 are mounted, but another connecting unit such as a wired transmission unit may be provided.

  FIG. 8 is a flowchart showing a physical address notification method for an HDMI relay device according to an embodiment of the present invention. A case where the study HDMI system is operated while the living HDMI system 100 is operating will be described.

  First, the address management unit 338 of the HDMI relay apparatus 210 acquires its own physical address from the EDID of the television 201, which is a downstream device, via the HDMI cable (step S11). In this embodiment, the address management unit 338 of the HDMI relay apparatus 210 acquires (1.0.0.0) as its own physical address.

  The address management unit 338 of the HDMI relay apparatus 210 assigns the terminal number of the relay path to the next digit in the valid range of the acquired physical address, and generates the physical address of the HDMI relay apparatus 110 that is the connection destination (step S12). . In this embodiment, since the effective range is the first digit, the relay route terminal number is assigned to the second digit, and (1.2.0.0) is assigned as the physical address of the connection destination HDMI relay device 110. Generate.

  The address management unit 338 of the HDMI relay apparatus 210 notifies the generated physical address (1.2.0.0) to the HDMI relay apparatus 110 (step S13).

  Similarly, the address management unit 338 of the HDMI relay apparatus 110 generates the physical address (1.3.0.0) of the HDMI relay apparatus 210 from the already assigned physical address (1.0.0.0). , Notify the HDMI relay apparatus 210.

  FIG. 9 is a diagram illustrating a method of transmitting address information of the address management unit of the HDMI relay apparatus used for physical address conversion according to an embodiment of the present invention.

  The address management unit 338 of the HDMI relay apparatus 110 notifies the HDMI relay apparatus 210 of the physical address of the HDMI relay apparatus 210 based on the television 101. The address management unit 338 of the HDMI relay apparatus 110 replaces the second digit of the physical address (1.0.0.0) of the HDMI relay apparatus 110 with 3 according to the physical address setting rule (1.3.0. 0) is notified to the HDMI relay apparatus 210 as a physical address based on the television 101 of the HDMI relay apparatus 210.

  Similarly, the address management unit 338 of the HDMI relay apparatus 210 notifies the HDMI relay apparatus 110 of the physical address of the HDMI relay apparatus 110 based on the television 201. When the HDMI relay apparatus 110 is viewed from the HDMI relay apparatus 210, the terminal number of the connection between the HDMI relay apparatuses is obtained as 2 according to the setting rule, so that the physical address (1.0.0.0) of the HDMI relay apparatus 210 is 2 The physical address (1.2.0.0) with the digit replaced with 2 is notified to the HDMI relay apparatus 110 as the physical address of the HDMI relay apparatus 110 with the HDMI relay apparatus 210 as a reference.

Next, a physical address conversion processing method in the address management unit of the HDMI relay apparatus on the command transmission side will be described with reference to FIG. 10 and FIG.
The address management unit 338 of the transmission-side HDMI relay device receives a CEC command including the physical address of the transmission device via HDMI (step S21). The address management unit 338 of the transmission-side HDMI relay device determines whether the device corresponding to the physical address of the transmission device included in the command received in step S21 is a device upstream of the own device (step S22). .

  For example, as shown in FIG. 11, a camcorder 220 having a physical address (2.0.0.0) is connected to the television 201 in the study, and the camcorder 220 reports its own physical address to the sink device. Consider the case where a Physical Address> command is transmitted. When the address management unit 338 of the HDMI relay apparatus 210 receives the <Report Physical Address> command, the physical address (2) included in the <Report Physical Address> command is determined in order to determine whether to transfer to the HDMI relay apparatus 110. .0.0) is determined whether the device (camcorder 220) is an upstream device of the device itself.

  For example, as in the camcorder 220 shown in FIG. 11, the physical address (2.0.0.0) included in the CEC command received via HDMI is the relay route even upstream of the HDMI side as viewed from the HDMI relay device 110. If it is not on the upstream side, it is determined that transfer of the received CEC command is unnecessary, and address conversion processing and command transfer processing are not performed.

  If it is determined that it is not upstream of the own device (NO in step S22), the address management unit 338 of the HDMI relay device on the transmission side does not need to transfer the command, and thus ends the process. If it is determined that it is upstream of the own device (YES in step S22), the address management unit 338 of the transmission-side HDMI relay device determines that the device corresponding to the source physical address received in step S21 is on the same HDMI path. It is determined whether or not the device is a device (step S23). A device on the same HDMI path is a device to which a physical address based on the sink device that is a reference for the physical address assigned to itself is assigned.

  If it is determined that the devices are on the same HDMI path (YES in step S23), the address management unit 338 of the HDMI relay apparatus on the transmission side physically assigns itself to the sink apparatus on the same HDMI path as a reference. The address is set as a conversion source physical address (step S24).

  Then, the address management unit 338 of the HDMI relay device on the transmission side sets the physical address obtained by returning the sink device on the same HDMI path as the HDMI relay device that transfers the command as the conversion destination physical address (step S25). The address management unit 338 of the transmission-side HDMI relay device calls the address conversion processing routine and executes the address conversion processing (step S26).

  If it is determined in step S23 that the devices are not on the same HDMI path (NO in step S23), the address management unit 338 of the HDMI relay device on the transmission side performs address conversion on the command to be transferred to the HDMI relay device 210. The requested information is added (step S29). In the case of the present embodiment, an address translation request flag is provided in a header for sending a command, and the address translation request flag is enabled.

  After the process of step S26 or step S29, the converted physical address is F.D. F. F. It is determined whether or not it is F (step S27). F. F. F. F represents an invalid address. Physical address is F. F. F. When it is determined that it is not F (YES in step S27), the CEC command is transferred to the connection destination HDMI relay apparatus (step S28). Physical address is F. F. F. If it is determined that it is F (NO in step S27), the process is terminated.

  Next, the address conversion process in step S26 will be described with reference to FIGS. FIG. 12 is a flowchart showing an address conversion method according to an embodiment of the present invention. FIG. 13 is a diagram used for explaining the address conversion method according to the embodiment of the present invention.

  First, the effective range and common part of the conversion source physical address are deleted from the conversion target physical address (step S31). The physical address after deletion is connected to the effective range of the conversion destination physical address (step S32). It is determined whether the physical address after connection is 5 digits or more (step S33).

  When it is determined that the number is 5 digits or more (YES in step S33), it is determined whether or not the physical addresses after the 5th digit are all 0 (step S34). If it is determined that all are 0 (YES in step S34), 0 after the fifth digit is deleted (step S35). If it is determined that all are not 0 (NO in step S34), all four digits are set to hexadecimal "F" (decimal number 15).

  If it is determined in step S33 that the number is not 5 digits or more (NO in step S33), it is determined whether or not the physical address of the connection word is 3 digits or less (step S37). If it is determined that there are 3 digits, 0 is added up to 4 digits (step S38). If it is determined that it is not less than 3 digits, the process is terminated.

  Next, physical address conversion processing in the address management unit of the HDMI relay device on the transfer command receiving side will be described with reference to the flowchart of FIG. FIG. 13 is a flowchart showing a physical address conversion processing method in the address management unit of the HDMI relay device on the transfer command receiving side in this embodiment.

  The address management unit 338 of the reception-side HDMI relay device receives the CEC command via a relay path (wireless communication in the present embodiment) with the transmission-side HDMI relay device (step S41). The address management unit 338 of the receiving-side HDMI relay device determines whether or not the address conversion request flag included in the header of the CEC command is enabled (step S42). When it is determined that the address is enabled (YES in step S42), the address management unit 338 of the receiving HDMI relay device has its own physical address based on the sink device serving as a reference for the physical address of the transmitting HDMI relay device. Is set as the conversion source physical address (step S43). Further, the address management unit 338 of the receiving-side HDMI relay device sets a physical address based on the sink device on the same HDMI path as the conversion destination physical address (step S44). Similarly to step S26, the address management unit 338 of the receiving-side HDMI relay device calls an address conversion processing routine and executes address conversion processing (step S45). If it is determined in step S42 that the address is not enabled (NO in step S42), or after the address conversion processing in step S45, the converted physical address is F.F. F. F. It is determined whether it is F (step S46). F. F. F. If it is determined that it is not F (YES in step S46), the CEC command is transferred to the HDMI path of the connection destination (step S47). F. F. F. If it is determined that it is F (NO in step S46), the process is terminated.

  Next, a first example of address conversion processing according to an embodiment of the present invention will be described with reference to FIG. FIG. 14 is a diagram showing a first example of address conversion processing according to an embodiment of the present invention.

  In this example, a CEC command called <Report Physical Address> command is transmitted from the DVD recorder 112 having a physical address of 1.2.0.0. The <Report Physical Address> command includes physical address information of a transmission source device as a parameter. The address management unit 338 of the HDMI relay apparatus 110 that has received the <Report Physical Address> command determines whether a device corresponding to the physical address exists upstream of the HDMI input terminal of the HDMI relay apparatus (step S22). In this embodiment, since the DVD Recorder as the transmission source is HDMI-connected to the HDMI relay apparatus 110 and is located upstream, it is determined that address conversion is necessary in the HDMI relay apparatus 110 (YES in step S22). The address management unit 338 of the HDMI relay apparatus 110 uses the physical address 1.0.0.0 and the physical address 1.2.0.0 acquired from the HDMI relay apparatus 210 to execute the <Report Physical Address> command. The physical address (1.2.0.0) included in the parameter is converted into a physical address (1.2.2.0) based on the television 201 (steps S24 to S26). The address management unit 338 of the HDMI relay apparatus 110 transfers a <Report Physical Address> command including the converted physical address from the HDMI relay apparatus 110 to the HDMI relay apparatus 210.

  Next, a specific example of the address conversion method will be described with reference to FIG. Hereinafter, an example in which the HDMI relay apparatus 110 converts the physical address included in the <Report Physical Address> command transmitted by the DVD recorder 112 described with reference to FIG. 14 will be described.

  First, at least two pieces of physical address information of the HDMI relay apparatus 110 are required. One is the physical address (1.0.0.0) acquired from the HDMI input terminal of the downstream HDMI device (TV 101), and the other is the physical address (1) acquired from the HDMI relay apparatus 210 at the end of the relay path. .2.0.0).

  In the example of FIG. 15, when the HDMI relay apparatus 110 relay apparatus receives the <Report Physical Address> [1.2.0.0] command, 1.2.0.0 included in the parameter of this command is the physical address to be converted. Become. When the physical address to be converted is received from a device on the same HDMI path, first, the physical address (1.0.0.0) of the HDMI relay apparatus 110 corresponding to the HDMI side and the physical address to be converted (1.2. 0.0), and deletes from the physical address to be converted a portion that matches the valid range (1 in the first digit) of the physical address of the HDMI relay apparatus 110. As a result, 2.0.0 remains in the physical address to be converted. Next, the deleted physical address is combined with the effective range (1.2) of the physical address (1.2.0.0) of the HDMI relay apparatus 110 based on the television 201. As a result, the physical address to be converted is 1.2.2.0.0. Finally, the number of digits in the address is confirmed. If it is 4 digits or more, 0 after the 4th digit is deleted. As a result, the final physical address after conversion is 1.2.2.0. In the last confirmation of the number of digits, if the physical address before the digit number adjustment is 3 digits or less (such as 1.3.0), 0 is added to the end until it becomes 4 digits (1.3.0.0). If the number of digits is exactly 4 before adjusting the number of digits, the adjustment process is not performed. If the number of digits is 5 or more and a numerical value other than 0 is included after the 5th digit (such as 1.3.2.2.1), all four digits are hexadecimal F (decimal number) 15). F. F. Convert to address F. F. F. F. F represents an invalid address, and processing such as transfer is not performed thereafter. In the example of FIG. 14, since the conversion of the CEC command transmitted by the device of the same HDMI path is performed, the physical address (1.0.0.0) of the HDMI relay apparatus 110 based on the television 101 is the conversion source address, and the television 201 The physical address (1.2.0.0) of the HDMI relay device 110 itself based on the above is used as the conversion destination address.

  If the command received via the relay path has an address translation request flag and physical address translation is performed in accordance with the flag, the physical address (1.2. 0.0) is used as the conversion source address, and the physical address (1.0.0.0) of the HDMI relay apparatus 110 on the HDMI side is used as the conversion destination address.

  Next, a second example of the address conversion process according to an embodiment of the present invention will be described with reference to FIG. FIG. 16 is a diagram showing a second example of the address conversion process according to the embodiment of the present invention.

  In this example, a CEC command <Set Stream Path> [1.2.2.0] is transmitted from the study television 201. The <Set Stream Path> command includes physical address information of a connection destination device as a parameter. The address management unit 338 of the HDMI relay apparatus 210 that has received this CEC command determines whether a device (DVD recorder 112) corresponding to the physical address included in the parameter exists upstream of the HDMI relay apparatus 210 (step S22).

  In the example illustrated in FIG. 16, the device (DVD recorder 112) corresponding to the physical address included in the parameter exists upstream of the HDMI relay apparatus 210 via the relay path. Therefore, the address management unit 338 of the HDMI relay apparatus 210 determines that the device (DVD recorder 112) corresponding to the physical address included in the parameter is an upstream device (YES in step S22).

  Next, the address management unit 338 of the HDMI relay apparatus 210 determines whether or not the device (DVD recorder 112) corresponding to the physical address included in the parameter is a device on the same HDMI path (step S23). In the example illustrated in FIG. 16, the device corresponding to the physical address included in the parameter is not on the same HDMI path as the HDMI relay apparatus 210. Therefore, the address management unit 338 of the HDMI relay apparatus 210 determines that the device corresponding to the physical address included in the parameter is not on the same HDMI path (NO in step S23).

  Therefore, the address management unit 338 of the HDMI relay apparatus 210 does not perform address conversion, enables the address conversion request flag included in the header of the CEC command (step S29), and transfers the <Set Stream Path> command to the HDMI relay apparatus 110. (Step S28).

  After confirming that the address conversion request flag is set to enable, the address management unit 338 of the HDMI relay apparatus 110 converts the physical address 1.2.2.0 to 1.2.0.0. Thereafter, the HDMI relay apparatus 110 transmits a <Set Stream Path> command including the converted address as a parameter via the HDMI command line.

  According to the relay device of the present embodiment, even when an HDMI route in which a plurality of sink devices (televisions) are mixed is relayed wirelessly or the like, it is possible to correctly perform physical address conversion and route control and perform video stream transmission. it can.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Further, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine suitably the component covering different embodiment.

  301-303 ... Address line, 311-314 ... Command line, 321-323 ... EDID, 330 ... HDMI switch unit, 331 ... HDMI reception unit, 332 ... HDMI transmission unit, 334 ... Switch control unit, 335 ... CEC command control unit 336: Command processing unit 337: AVC command control unit 338: Address management unit 339: Video transmission unit 340: Wireless MAC unit 341: Wireless PHY unit

Claims (9)

A communication system including a first sink device that displays input video,
Communication means for communicating with other communication systems including the second sink device;
Receiving means for receiving a first command including a first physical address in a parameter transmitted from a source device to which an address based on the first sink device is assigned;
Conversion means for converting the first physical address in the parameter to a second physical address based on the second sink device when transferring the command to the other communication system;
The communication means, wherein the communication means transmits a second command including the second physical address to the other communication system.   The communication system according to claim 1, wherein the conversion unit converts the first physical address into the second physical address when the first physical address indicates an upstream device of the communication system.   The communication system according to claim 1, wherein the conversion unit is assigned with reference to the first sink device, and converts the first physical address based on a third physical address related to the communication system. An acquisition unit configured to acquire a fourth physical address related to the other communication system, which is assigned from the other communication system with reference to the second sink device;
The communication system according to claim 3, wherein the conversion unit converts the first physical address into the second physical address based on the third physical address and the fourth physical address. Means for determining whether to perform the conversion of the first physical address in the other communication system;
The communication system according to claim 1, wherein the conversion unit converts the first physical address when the physical address is not converted in the other communication system.   2. The communication system according to claim 1, wherein the conversion unit converts the first physical address when the first physical address indicates a device belonging to the first sink-side network. A communication system including a first sink device that displays input video,
Communication means for communicating with other communication systems including the second sink device;
Receiving means for receiving a command including, as a parameter, a first physical address based on the first sink device, transmitted from a source device to which an address based on the first sink device is assigned;
With
When the command is transferred to the other communication system, the communication means sends information related to a request to convert the first physical address to a physical address based on the second sink device and the command. A communication system characterized by transmitting to a communication system. Means for determining whether to perform the conversion of the first physical address in the other communication system;
The communication system according to claim 7, wherein the communication unit transmits the command together with information requesting the conversion of the first physical address when the conversion of the first physical address is performed in the other communication system.   8. The communication system according to claim 7, wherein the communication unit transmits information on the request and the command when the first physical address indicates a device belonging to the network on the second sink side. 9.

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