JP2008109711A - Radio communication system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radio communication apparatus which puts its appearance in order by eliminating wiring for transmitting/receiving a CEC message, and easily transmits the CEC message from one radio communication apparatus to a plurality of radio communication apparatuses. <P>SOLUTION: In a radio communication system comprising a source device (1) and a sink device (2) for transmitting/receiving the CEC message defined in the HDMI standard, a CEC controller (14) of the source device (1) generates and outputs a CEC frame containing the CEC message. A controller (10) generates a radio data packet containing the CEC message in the generated CEC frame. A radio transmitting/receiving circuit (15) radio-transmits a radio signal including the generated radio data packet to the sink device (2) and receives, in response to the radio data packet in the radio signal radio-transmitted, a radio signal including a radio ACK packet radio-transmitted from the sink device (2). <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a wireless communication apparatus, a wireless communication system, and a wireless communication apparatus control method for wirelessly communicating a CEC (Consumer Electronics Control) message defined in a High-Definition Multimedia Interface (HDMI) standard.

  Japanese Patent Application Laid-Open No. 2004-151867 discloses a technique for transmitting a CEC message defined by the HDMI standard by wire. In U.S. Patent No. 6,057,049, a method for determining the topology of a network having a master node and one or more slave nodes interconnected using a one-way data connection is disclosed. The master node makes the data available to the later node, and the slave node reads the data from the previous node, and the read data has information on the path from the master node to the slave node. A further method for configuring a path by sending data from a slave node to all nodes on the path via a bidirectional data connection between the nodes is disclosed. In a preferred embodiment, a home entertainment system using HDMI is a suitable network and has a presentation component (e.g., a television receiver) operable to function as a master node, where the nodes of the network are HDMI code sets. Try to be interconnected. The HDMI standard includes a DDC bus corresponding to the one-way data connection and a CEC bus corresponding to the two-way data connection.

Japanese Patent Laying-Open No. 2005-528853. JP-A-2005-244474. JP-A-5-114879. JP 2001-57690 A. High-Definition Multimedia Interface Specification, Version 1.1.

  However, when a transmission-side wireless communication device and a reception-side wireless communication device are connected by wire to transmit a CEC message, not only does the appearance look messy, but the single transmission-side wireless communication device On the other hand, each wire can be received by only one wireless communication device, and when receiving by another wireless communication device, there is a problem in that it takes time to change the cable.

  The object of the present invention is to solve the above problems, eliminate the wiring for transmitting and receiving the CEC message, to make the appearance orderly, and easily transmit the CEC message from one wireless communication device to a plurality of wireless communication devices. To provide a wireless communication device, a wireless communication system, and a control method for the wireless communication device.

  A wireless communication device according to a first aspect of the present invention includes a first wireless communication system including a first wireless communication device and a second wireless communication device, the wireless communication device including a plurality of wireless communication devices that transmit and receive CEC messages defined in the HDMI standard. CEC control means for generating and outputting a CEC frame including a CEC message, control means for generating a wireless data packet including a CEC message in the generated CEC frame, and the generated wireless A wireless reception response wirelessly transmitted to the second wireless communication device including a data packet, and wirelessly transmitted from the second wireless communication device in response to a wireless data packet in the wirelessly transmitted wireless signal And a wireless transmission / reception means for receiving a wireless signal including a packet.

  In the wireless communication apparatus, the CEC control unit and the control unit may be connected to each other via an internal bus.

  In the wireless communication apparatus, the CEC control unit and the control unit may be connected to each other via an internal bus and a wire.

  Further, in the wireless communication device, when the control unit receives a wireless reception response packet from the second wireless communication device within a predetermined time, the control unit outputs a predetermined reception response signal to the CEC control unit, When the wireless reception response packet from the second wireless communication apparatus for the wireless data packet is not received within a predetermined time, outputting the reception response signal to the CEC control unit may be stopped. Here, in the wireless communication apparatus, when the CEC control unit does not detect a reception response signal from the control unit within a predetermined time after the output of the CEC frame, the CEC frame re-outputs the CEC frame. , When inputting the CEC frame re-output by the CEC control means, if the wireless reception response packet for the wireless data packet has already been received, stop wireless transmission of the wireless data packet, The reception response signal may be output to the CEC control means. Further, a transmission data information table for storing at least a part of the CEC frame in the wireless data packet and a reception status indicating whether or not the wireless response reception packet for the wireless data packet is received is stored. Storage means for storing, when wirelessly transmitting a wireless signal including the wireless data packet, the control means stores at least a part of a CEC frame in the wireless data packet in the transmission data information table; When the response reception packet is wirelessly received, the reception status indicating that the wireless response reception packet for the wireless data packet is received may be stored.

  Instead, when the CEC frame generated by the CEC control unit is input, the control unit may output a predetermined reception response signal to the CEC control unit.

  Still further, in the above wireless communication apparatus, the CEC frame includes at least one block having a predetermined format, and the control means outputs the reception response signal to the CEC control means when the block is not the final block. However, when the block is the last block, the wireless data packet may be transmitted wirelessly.

  In the wireless communication device, when the wireless transmission / reception unit receives a wireless signal of a wireless reception response packet wirelessly transmitted from the second wireless communication device, the control unit includes: A source logical address of the second wireless communication apparatus included in the CEC frame is set as a CEC logical address, a source device ID in the wireless reception response packet is set as a wireless device ID, and the CEC logical address and the wireless A device ID may be associated with each other as a pair, and after assigning a CEC physical address to the associated pair, the CEC physical address and the corresponding pair may be stored in the storage unit as a node information table.

  A wireless communication system according to a second aspect of the invention includes a plurality of the wireless communication devices.

  According to a third aspect of the present invention, there is provided a wireless communication apparatus control method for a wireless communication system including a first wireless communication apparatus and a second wireless communication apparatus, wherein the wireless communication apparatus includes a plurality of wireless communication apparatuses that transmit and receive CEC messages defined in the HDMI standard. And generating a CEC frame including a CEC message, generating a wireless data packet including a CEC message in the generated CEC frame, and generating the CEC frame. A wireless signal including the transmitted wireless data packet is wirelessly transmitted to the second wireless communication device, and wirelessly transmitted from the second wireless communication device in response to the wireless data packet in the wirelessly transmitted wireless signal. Receiving a radio signal including a radio reception response packet.

  In the method for controlling the wireless communication device, when a wireless reception response packet is received from the second wireless communication device within a predetermined time, a predetermined reception response signal is output, while the wireless data packet is received within a predetermined time. The method may further include a step of stopping outputting the reception response signal when the wireless reception response packet from the second wireless communication apparatus is not received. Here, in the control method of the wireless communication apparatus, when the reception response signal from the control means is not detected within a predetermined time after the output of the CEC frame, the step of re-outputting the CEC frame and the re-output When receiving the wireless reception response packet for the wireless data packet when the CEC frame is input, stopping the wireless transmission of the wireless data packet and outputting the reception response signal; May be included.

  Therefore, according to the wireless communication device, the wireless communication system, and the control method of the wireless communication device according to the present invention, by wirelessly communicating the CEC message, the wiring for transmitting and receiving the CEC message is eliminated, and the appearance is made orderly. It has a specific effect that a CEC message can be easily transmitted from one wireless communication device to a plurality of wireless communication devices without changing cables.

  In addition, since the CEC control means and the control means are connected to each other via an internal bus and a wire, it is possible to wirelessly send and receive CEC frames even in a wireless transmission device having only a wired interface for sending and receiving CEC messages. It becomes.

  Hereinafter, embodiments according to the present invention will be described with reference to the drawings. In addition, in each following embodiment, the same code | symbol is attached | subjected about the same component.

First embodiment.
FIG. 1 is a block diagram showing a configuration of a radio communication system according to the first embodiment of the present invention. In FIG. 1, the wireless communication system according to the present embodiment includes a source device 1 and a sink device 2. The source device 1 includes a controller 10, a read only memory (hereinafter referred to as ROM (Read Only Memory)) 11, a random access memory (hereinafter referred to as RAM (Random Access Memory)) 12, a DVD player 13, A CEC controller 14, a wireless transmission / reception circuit 15, and an antenna 16 are provided. The sink device 2 includes a controller 20, a ROM 21, a speaker 22, a display 23, a CEC controller 24, a wireless transmission / reception circuit 25, an antenna 26, a RAM 27, and an audio signal and video signal processing circuit 30. Composed.

  In the source device 1 of FIG. 1, the DVD player 13 reads out a video signal and an audio signal recorded on a recording medium such as a DVD based on the control from the controller 10 and outputs them to the wireless transmission / reception circuit 15. The ROM 11 stores own station node information 11a including the own station logical address of the source apparatus 1 and the own station device ID such as the MAC address of the source apparatus 1, for example. The RAM 12 includes a transmission data information table 12a (described later with reference to FIG. 3) including a transmission data information of a CEC frame including a CEC (Consumer Electronics Control) message transmitted / received via the antenna 16, the source device 1, and the like. A node information table 12b (which will be described later with reference to FIG. 2) including node information such as a physical address, a logical address, and a device ID of each device constituting the wireless communication system such as the sink device 2 is stored. The CEC controller 14 has a bus interface for connecting to the bus B1, and is defined in the HDMI (High-Definition Multimedia Interface) standard based on node information read from the node information table 12b of the RAM 12 via the controller 10. The CEC frame is generated, and the generated CEC frame is output to the controller 10 via an internal bus (hereinafter referred to as a bus) B1, while the ACK signal output from the controller 10, the antenna 16, and wireless transmission / reception The CEC frame transmitted from the sink device 2 is received via the circuit 15 and the controller 10, and a predetermined operation is executed according to the control code of the CEC message included in the CEC frame. The CEC frame is continuously output from the CEC controller 14 to the controller 10 via the bus B1 as a pulse waveform indicating “0” or “1”.

  The wireless transmission / reception circuit 15 encodes the video signal and the audio signal read by the DVD player 13, generates a transmission packet, and generates a carrier wave having a frequency of, for example, a millimeter wave band or a microwave band. By modulating according to the above, a wireless AV signal is generated and transmitted to the sink device 2 via the antenna 16, while a wireless data packet output from the controller 10 is encoded, for example, a frequency in the millimeter wave band or microwave band A carrier wave is modulated according to the wireless data packet to generate a wireless data signal, and the generated wireless data signal is transmitted to the sink device 2 via the antenna 16. The wireless transmission / reception circuit 15 receives a wireless data signal having a predetermined frequency from the sink device 2 via the antenna 16, performs frequency conversion processing and decoding processing, and then transmits the processed data signal to the controller 10. Output. The controller 10 has a bus interface for connecting to the bus B1, generates a wireless data packet including a CEC frame input from the CEC controller 14 via the bus B1, outputs the wireless data packet to the wireless transmission / reception circuit 15, and outputs The transmission data information of the CEC frame (described later with reference to FIG. 3) is stored in the transmission data information table 12a of the RAM 12. In addition, the controller 10 performs reception packet processing on the data signal received from the sink device 2 via the antenna 16 and the wireless transmission / reception circuit 15 to generate a wireless data packet, and based on the generated wireless data packet, Address information registration processing and data transmission / reception processing (described later with reference to FIGS. 7 and 8) are executed.

  In the sink device 2, the wireless transmission / reception circuit 25 performs frequency conversion processing, reception packet processing, and decoding processing on the wireless AV signal received via the antenna 26, and then outputs the processed video signal and audio signal. The AV signal is output to the audio signal and video signal processing circuit 30, while the radio data signal received via the antenna 26 is subjected to frequency conversion processing and decoding processing, and then the processed data signal is converted to the controller 20 is output. The wireless transmission / reception circuit 25 encodes a wireless data packet output from the controller 20, modulates a carrier wave having a predetermined frequency according to the wireless data packet, thereby generating a wireless data signal, and generates the generated wireless data signal. And transmitted to the source device 1 via the antenna 26. The ROM 21 is configured in the same manner as the ROM 11 of the source device 1, and stores the local station node information 21a including the local station logical address and the local station device ID of the sink device 2. The RAM 27 is configured in the same manner as the RAM 12 of the source device 1, and stores a transmission data information table 27a and a node information table 27b. The controller 20 and the CEC controller 24 are configured in the same manner as the controller 10 and the CEC controller 14 of the source device 1, but are connected to each other via a bus B2 instead of the bus B1, and have a bus interface for connecting to the bus B2. The controller 20 controls the audio signal and video signal processing circuit 30 instead of the DVD player 13. The audio signal and video signal processing circuit 30 separates the processed AV signal output from the wireless transmission / reception circuit 25 into a video signal and an audio signal, outputs the video signal to the display 23, and displays the audio signal. 22 for output.

  FIG. 2 is a table showing an example of the node information table 12b stored in the RAM 12 of FIG. In the node information table 12b of FIG. 2, the CEC logical address, the CEC physical address, and the wireless device ID are stored in association with each other. The CEC physical address is a 4-digit number uniquely assigned in the source device 1 for transmission / reception of the CEC frame to the source device 1 itself and other wireless communication devices such as the sink device 2 wirelessly connected to the source device 1. It is a numerical value. For example, in FIG. 2, the CEC physical address “0.0.0.0” is assigned to the source device 1 itself, and the CEC physical addresses “1.0.0.0” and “2.0.0.0” are assigned. , “3.0.0.0”... Are sequentially assigned to other wireless communication devices that have undergone address registration processing by the source device 1. Further, for example, when the source device 1 connects to another wireless communication device via a wireless communication device having the CEC physical address “1.0.0.0”, “1.1.0.0”, “ “1.2.0.0”, “1.3.0.0”... Are assigned in order. The CEC logical address corresponds to the logical address of the source device 1 and other wireless communication devices wirelessly connected to the source device 1. The wireless device ID corresponds to the device ID of the source device 1 and other wireless communication devices that are wirelessly connected to the source device 1. In the present embodiment, the node information table 12b includes both the CEC logical address and the CEC physical address, but may be configured to include only one of them.

  FIG. 3 is a table showing an example of the transmission data information table 12a stored in the RAM 12 of FIG. In the transmission data information table 12a of FIG. 3, a transmission source logical address indicating a transmission source wireless communication apparatus that transmits a CEC frame, a destination logical address indicating a destination wireless communication apparatus that should receive the CEC frame, transmission data, An ACK reception status indicating whether or not an ACK signal has been received for a CEC frame is stored in association with each other. In the present embodiment, for example, when the ACK reception status is “1”, it indicates that an ACK signal for the CEC frame has not been received, while when it is “0”, an ACK signal for the CEC frame is received. Indicates that

  FIG. 4 is a configuration diagram showing an example of the format of the wireless data packet 1000. As shown in FIG. In FIG. 4, the wireless data packet 1000 includes a MAC header area and a CEC frame area 700. The MAC header area includes a destination device ID that is a device ID of a destination wireless communication apparatus that should receive the wireless data packet 1000, and a transmission source device ID that is a device ID of a transmission source wireless communication apparatus that transmits the wireless data packet 1000. Including. The CEC frame area 700 includes CEC frames generated by the CEC controllers 14 and 24. Note that the CEC frame area may include only a part of the CEC frame generated by the CEC controllers 14 and 24.

  FIG. 5 is a configuration diagram showing an example of a format of the CEC frame area 700 of FIG. In FIG. 5, the CEC frame area 700 includes one start bit, one header block 800, and N or more integer N data blocks 800 subsequent to the header block. The start bit is a bit indicating the start of the CEC frame and has a predetermined pulse waveform. The wireless communication device on the receiving side detects the start bit to detect that the wireless data packet includes a CEC frame, and samples the pulse waveform at a predetermined period from the detection timing of the start bit, thereby A header block and data block 800 may be received. The header block and the data block 800 have the same configuration as described later with reference to FIG.

  FIG. 6 is a block diagram showing an example of the format of the header block and data block 800 of FIG. In FIG. 6, a header block and data block 800 include an 8-bit information bit area, 1 EOM (End of Message) bit, and 1 ACK (Acknowledge) bit. In the header block, the information bit area includes a 4-bit source logical address that is the logical address of the source wireless communication device of the CEC frame and a 4-bit destination that is the logical address of the destination wireless communication device that should receive the CEC frame. Stores a logical address. In the data block, the information bit area stores a control code or the like for instructing a predetermined operation to the destination wireless communication apparatus that transmits the CEC frame. The EOM bit is set to “1” if the header block or data block is the last block of the CEC frame, and is set to “0” otherwise. The ACK bit is always set to “1” in the transmission buffer of the bus interface by the CEC controllers 14 and 24 that generate the CEC frame, and when the EOM bit is “0”, the information bit area and the EOM bit are recognized. When the controller 10 or 20 sets “0” and the EOM bit is “1”, the controller 10 or 20 sets “0” when the wireless ACK packet for the wireless data packet is received from the sink device 2. The After outputting the EOM bit, the CEC controllers 14 and 24 sample the ACK bit of the transmission buffer after a predetermined time (for example, 2.4 milliseconds), and if the ACK bit remains at the initial value “1”, Recognize that transmission of a block or CEC frame has failed.

  The operation of the wireless communication system configured as described above will be described below with reference to FIGS. 7, 8, 9 and 10. FIG. 7 to 10, as an example, the source device 1 registers the address information of the sink device 2, the source device 1 transmits a CEC frame to the sink device 2, and the sink device 2 receives the CEC frame from the source device 1. A case of receiving will be described. However, the present invention is not limited to this operation, but the reverse operation, that is, the sink device 2 registers the address information of the source device 1, the sink device 2 transmits the CEC frame to the source device 1, and the source device 1 A CEC frame from the device 2 may be received.

  FIG. 7 is a flowchart showing address information registration processing by the controller 10 of the source device 1 of FIG. In step S10 of FIG. 7, it is determined whether or not the wireless data signal for address registration broadcast, for example, by the sink device 2, for example, is wirelessly received via the antenna 16, and if YES, the process proceeds to step S11. If NO, the process returns to step S10 and the process is repeated. In step S11, it is determined whether or not the wireless data packet obtained by processing the wirelessly received wireless data signal includes a CEC frame. If YES, the process proceeds to step S12. If NO, the process proceeds to step S12. The process ends. In step S12, the transmission source logical address included in the header block of the CEC frame is set as the CEC logical address, the transmission source device ID included in the MAC header of the wireless data packet is set as the wireless device ID, and the CEC logical address and wireless After associating device IDs as a pair and assigning a CEC physical address to the associated pair, the CEC logical address and the corresponding pair are stored and registered in the node information table 12b, and the process ends. .

  FIG. 8 is a flowchart showing data transmission / reception processing by the controller 10 of the source device 1 of FIG. In step 20 of FIG. 8, first, the flag FLAG is set to 0. In step S21, the information bit area and EOM bit of the header block of the CEC frame to be transmitted are input from the CEC controller 14 via the bus B1. Next, in step S22, it is determined whether or not the destination logical address included in the information bit area of the header block is registered as the CEC logical address of the node information table 12b. If YES, the process proceeds to step S23, while NO. When the signal is input from the CEC controller 14 via the bus B1, the process is terminated. Next, in step S23, it is determined whether or not the EOM bit of the input block is “1”. If YES, the process proceeds to step S26, and if NO, the process proceeds to step S24. In step S24, the controller 10 outputs the ACK bit which is “0” to the CEC controller 14 via the bus B1, and in step S25, the information bit area of the next data block is transmitted from the CEC controller 14 via the bus B1. After inputting the EOM bit, the process returns to step S23 to repeat the process.

  In step S26, it is determined whether or not the flag FLAG is 1. When YES, the process proceeds to step S29, and when NO, the process proceeds to step S27. In step S27, the wireless device ID corresponding to the CEC logical address is set as the destination device ID, the device ID of the source device 1 is set as the transmission source device ID in the MAC header of the wireless data packet, and the sink device together with the CEC frame The transmission data information is stored in the transmission data information table 12a, the flag FLAG is set to 1 in step S28, and the process proceeds to step S29. In the CEC frame to be transmitted, “0” is set to the ACK bit of the last data block by the controller 10 and transmitted. In step S29, it is determined whether or not a wireless ACK packet for the transmitted wireless data packet is wirelessly received from the sink device 2 within a predetermined time. If YES, the process proceeds to step S30. If NO, the process proceeds to step S31. move on. In step S30, the ACK bit of “0” is output to the CEC controller 14 via the bus B1, and “0” is set in the ACK reception status corresponding to the transmission data information of the wireless transmission in the transmission data information table 12a. To finish the process. In step S31, the CEC controller 14 is caused to execute a CEC frame retransmission process, and then the process returns to step S21 to repeat the process.

  FIG. 9 is a flowchart showing data transmission / reception processing by the controller 20 of the sink device 2 of FIG. In step S40 of FIG. 9, it is first determined whether or not the wireless data signal from the source device 1 has been wirelessly received via the antenna 26. If YES, the process proceeds to step S41. If NO, the process proceeds to step S40. Return and repeat the process. In step S41, the wireless data packet obtained by processing the wirelessly received wireless data signal as a reception packet includes the CEC frame, and the destination logical address included in the header block of the CEC frame is the local station node information 11a of the ROM 21. It is determined whether or not the logical address of the sink device 2 of the sink device 2 included in is equal to, the process proceeds to step S42 if YES, and the process ends if NO. In step S42, a wireless ACK packet corresponding to the wireless data packet received wirelessly is wirelessly transmitted to the source device 1, and in step S43, the CEC frame wirelessly received is output to the CEC controller 24 via the bus B2, and the process ends. To do.

  FIG. 10 is a sequence diagram showing signals at various parts of the wireless communication system of FIG. In FIG. 10, as an example, a case where the source device 1 transmits a CEC frame including one header block and N data blocks to the sink device 2 will be described. It is assumed that the address information of the sink device 2 has already been registered in the node information table 12b of the source device 1.

  In the source device 1, the CEC controller 14 first outputs a start bit (not shown) to the controller 10 via the bus B1, and then outputs an information bit area and an EOM bit of the header block. In this case, since the header block is not the last block, the EOM bit of the header block is “0”. In the ACK bit, “1” is set in advance in the transmission buffer of the bus interface of the CEC controller 14, but the controller 10 sends the information bit area and the EOM bit of the header block from the CEC controller 14 via the bus B1. When input is normal, the controller 10 outputs an ACK bit of “0” and sets “0” to the ACK bit in the transmission buffer. As a result, the CEC controller 14 recognizes that the information bit area and the EOM bit of the header block have been correctly input to the controller 10. Next, the CEC controller 14 outputs the information bit area and the EOM bit of the data block 1 to the controller 10 via the bus B1. Since this data block 1 is not the last block, the EOM bit is “0”, and the controller 10 outputs an ACK bit of “0”. Thereafter, the same operation is performed up to the data block (N-1). Next, the CEC controller 14 outputs the information bit area and the EOM bit of the data block N to the controller 10 via the bus B1. Since this data block is the last data block, the EOM bit is “1”. When the controller 10 detects the EOM bit that is “1”, the controller 10 wirelessly transmits the wireless data packet including the CEC frame including the header block and the data blocks 1 to N to the sink device 2 by the wireless transmission / reception circuit 15, The transmission data information of the CEC frame is stored in the transmission data information table 12a.

  The controller 20 of the sink device 2 receives the wireless data packet transmitted from the source device 1 by the wireless transmission / reception circuit 25. When the destination logical address included in the received wireless data packet matches the local logical address (that is, when the wireless data packet is addressed to the local station), the controller 20 wirelessly transmits a wireless ACK packet to the source device 1. While transmitting, the header block and the data blocks 1 to N are output to the CEC controller 24 via the bus B2. Here, a start bit may be output prior to the header block and the data blocks 1 to N.

  When the controller 10 of the source device 1 receives the wireless ACK packet from the sink device 2 by the wireless transmission / reception circuit 15, the controller 10 outputs an ACK bit of “0” to the CEC controller 14 via the bus B1, and the transmission data information table 12a “0” is stored in the ACK reception status corresponding to the wireless transmission. In this case, after the output of the EOM bit of the data block N by the CEC controller 14, the controller 10 buses the ACK bit which is “0” before the CEC controller 14 samples the ACK bit of the data block N in the transmission buffer. Since the data is output to the CEC controller 14 via B 1, the CEC controller 14 detects the ACK bit that is “0” of the data block N and recognizes that the CEC frame has been normally received by the sink device 2. If the controller 10 does not output the ACK bit of “0” to the CEC controller 14 via the bus B1 before the CEC controller 14 samples the ACK bit of the data block N in the transmission buffer, The ACK bit of the data block N remains “1” which is the initial value, and the CEC controller 14 recognizes that transmission of the CEC frame to the sink device 2 has failed. In this case, after a predetermined time elapses, the CEC controller 14 generates the same header block and data block, and outputs them again to the controller 10 via the bus B1 to perform retransmission processing.

  FIG. 11 is a sequence diagram illustrating signals of respective units of the wireless communication system of FIG. 1 when CEC frame retransmission processing is performed. In FIG. 11, when the EOM bit of the retransmitted data block N is input to the controller 10, the controller 10 has already received the wireless ACK packet from the sink device 2, so the wireless data packet is sent to the sink device 2. Without wireless transmission again, the ACK bit of “0” is output to the CEC controller 14 via the bus B1. Whether or not the wireless ACK packet is received from the sink device 2 is determined by referring to the ACK reception status in the transmission data table 18, for example. If the wireless ACK packet has not yet been received from the sink device 2 at the time when the retransmitted EOM bit of the data block N is input to the controller 10, the ACK bit of the data block N remains “1”. Yes, the CEC controller 14 executes the CEC frame retransmission process again.

  As described above, according to the wireless communication system according to the first embodiment, the CEC message is wirelessly communicated to eliminate the wiring for transmitting and receiving the CEC message, and to make the appearance orderly, and to change the cable. A CEC message can be easily transmitted from one wireless communication device to a plurality of wireless communication devices without any problem.

  Further, since the controller 10 has a transmission data information table 12a for storing whether or not a wireless ACK packet for the transmitted wireless data packet has been received, if the wireless ACK packet is not received, the controller 10 retransmits it. Processing can be performed.

  In this embodiment, the ACK bit of the header block and data blocks 1 to (N−1) is set to “0” when normally input to the controller 10, but the present invention is not limited to this. When a wireless data packet is generated and transmitted for each block and a wireless ACK packet for the wireless data packet is received, the ACK bit of each block may be set to “0”.

  Further, in step S27 of FIG. 8, the wireless data packet is wirelessly transmitted by unicast. However, the present invention is not limited to this, and the wireless data packet may be wirelessly transmitted by broadcast. In this case, in step S27 of FIG. 8, a predetermined value indicating broadcast wireless transmission is set in the destination device ID of the wireless data packet. In this case, the address registration process by the source device 1 in FIG. 7 may not be executed. As shown in FIG. 12, in the data transmission / reception process by the sink device 2, when it is determined No in step S41, the step S43 may be executed.

  Furthermore, each format showing the wireless data packet, CEC frame, header block, or data block described in detail with reference to FIGS. 4, 5, and 6 is merely an example, and other configurations may be used. . For example, the CEC frame region 700 included in the wireless data packet 1000 transmitted / received between the source device 1 and the sink device 2 does not necessarily include the start bit, the EOM bit, and the ACK bit.

  10 and 11, when the sink device 2 receives the wireless data packet from the source device 1, the destination logical address included in the received CEC frame matches the local logical address of the sink device 2. The wireless ACK packet is wirelessly transmitted to the source device 1. However, the present invention is not limited to this configuration. For example, as shown in FIG. 13, the controller 20 of the sink device 2 sends all CEC frames included in the received wireless data packet to the CEC controller 24 via the bus B2. After the output, the wireless ACK packet may be wirelessly transmitted to the source device 1.

  Furthermore, in the source device 1, the controller 10 and the CEC controller 14 each have a bus interface and are connected by a bus B1. However, the present invention is not limited to this configuration, and the controller 10 and the CEC controller 14 may have an interface other than the bus interface. In this case, the controller 10 may input a wireless data packet including a CEC frame according to another interface format, and the controller 10 outputs an ACK bit of “0” to the CEC controller 14 via the bus B1. Instead of this, a reception confirmation response may be sent to another interface. Similarly, in the sink device 2, the controller 20 and the CEC controller 24 each have a bus interface and are connected by a bus B2. However, the present invention is not limited to this configuration, and the controller 20 and the CEC controller 24 may have other interfaces than the bus interface.

  In the source device 1, the controller 10 receives a wireless ACK packet for the wireless data packet transmitted wirelessly from the sink device 2, and then outputs an ACK bit of “0” to the CEC controller 14 via the bus B 1. However, the present invention is not limited to this configuration. For example, as shown in FIG. 14, after wirelessly transmitting a wireless data packet, the CEC controller 14 is notified via the bus B <b> 1 without waiting for a wireless ACK packet from the sink device 2. An ACK bit that is “0” may be output. The flowchart of FIG. 14 differs from FIG. 8 in that steps S20, 26, 28, 29, and 31 are excluded from the flowchart of FIG.

Second embodiment.
FIG. 15 is a block diagram showing a configuration of a radio communication system according to the second embodiment of the present invention. 15, the wireless communication system according to the present embodiment includes a source device 1A, a sink device 2A, and adapter devices 57 and 67. The source device 1A is shown in FIG. 1 in that it includes a wired transmission / reception circuit 55 and a controller 10A instead of the antenna 16, the wireless transmission / reception circuit 15, the RAM 12, and the controller 10 according to the first embodiment shown in FIG. Unlike the source device 1 according to the first embodiment, the sink device 2A includes a wired transmission / reception circuit 65 instead of the antenna 26, the wireless transmission / reception circuit 25, the RAM 27, and the controller 20 according to the first embodiment illustrated in FIG. And the point provided with the controller 20A is different from the sink device 2 according to the first embodiment shown in FIG. In other respects, the wireless communication system according to the present embodiment is the same as the wireless communication system according to the first embodiment, and a detailed description of the components given the same reference numerals is omitted.

  In FIG. 15, the adapter device 57 includes a controller 50, a wired transmission / reception circuit 51, a RAM 52, a wireless transmission / reception circuit 54, and an antenna 56. The adapter device 67 includes a controller 60, a wired transmission / reception circuit 61, a RAM 62, a wireless transmission / reception circuit 64, and an antenna 66. The source device 1A and the adapter device 57 are connected to each other via a cable C1. The sink device 2A and the adapter device 67 are connected to each other via a cable C2.

  In the source device 1A, the controller 10A outputs the CEC frame input from the CEC controller 14 to the wired transmission / reception circuit 55, while the CEC frame received from the sink device 2A via the wired transmission / reception circuit 55 and the adapter device 57 is the CEC controller. 14 for output. The wired transmission / reception circuit 55 transmits the video signal and audio signal read from the DVD player 13 or the CEC frame input from the controller 10A to the adapter device 57 via the cable C1, while the adapter transmits the adapter via the cable C1. The CEC frame transmitted from the device 57 by the sink device 2 is received.

  In the adapter device 57, the wired transmission / reception circuit 51 outputs a video signal and an audio signal received from the source device 1A via the cable C1 to the wireless transmission / reception circuit 54, and is received from the source device 1A via the cable C1. The CEC frame is transmitted to the controller 50, or the CEC frame transmitted from the sink device 2A is transmitted to the source device 1A via the cable C1. The controller 50 generates a wireless data packet including the CEC frame output from the wired transmission / reception circuit 51 and outputs the wireless data packet to the wireless transmission / reception circuit 54, and stores transmission data information of the output CEC frame in the transmission data information table 52a of the RAM 52. To do. Further, the controller 50 executes address information registration processing and data transmission / reception processing based on the CEC frame included in the wireless data packet received from the sink device 2A via the wireless transmission / reception circuit 54 and the antenna 56. The RAM 52 stores a transmission data information table 52a having a configuration similar to that of the transmission data information table 12a illustrated in FIG. 3, and a node information table 52b having a configuration similar to the node information table 12b illustrated in FIG. In the node information table 52b, the CEC logical address and wireless device ID of the source device 1A itself are, for example, the timing at which the adapter device 57 is connected to the source device 1A, the controller 50 is connected to the wired transmission / reception circuits 51 and 55, and the controller 10A. May be generated based on the local station node information 11a read from the ROM 11 of the source device 1A. The wireless transmission / reception circuit 54 and the antenna 56 are configured in the same manner as the wireless transmission / reception circuit 15 and the antenna 16 of FIG.

  In the sink device 2A, the controller 20A and the wired transmission / reception circuit 65 are configured similarly to the controller 10A and the wired transmission / reception circuit 55 of the source device 1A, respectively. However, the wired transmission / reception circuit 65 outputs the AV signal received via the cable C2 to the audio signal and video signal processing circuit 30, and the controller 20A controls the audio signal and video signal processing circuit 30 instead of the DVD player 13. To do. In the adapter device 67, the controller 60, the wired transmission / reception circuit 61, the RAM 62, and the wireless transmission / reception circuit 64 are configured in the same manner as the controller 50, the wired transmission / reception circuit 51, the RAM 52, and the wireless transmission / reception circuit 54 of the adapter device 57, respectively. However, the RAM 62 stores a transmission data information table 62a having the same configuration as the transmission data information table 12a shown in FIG. 3 and a node information table 62b having the same configuration as the node information table 12b shown in FIG. Then, the wireless transmission / reception circuit 64 outputs the AV signal to the wired transmission / reception circuit 61.

  The operation of the wireless communication system configured as described above will be described below with reference to FIG. FIG. 16 is a sequence diagram showing signals at various parts of the wireless communication system of FIG. In FIG. 16, as an example, the source device 1A and the adapter device 57 transmit the CEC frame to the sink device 2A and the adapter device 67, and the sink device 2A and the adapter device 67 receive the CEC frame from the source device 1A and the adapter device 57. The case where it does is demonstrated. However, the present invention is not limited to this operation, and the reverse operation, that is, the sink device 2A and the adapter device 67 transmit the CEC frame to the source device 1A and the adapter device 57, and the source device 1A and the adapter device 57 perform the sink device 2A. The CEC frame from the adapter device 67 may be received. It is assumed that the address information of the sink device 2A is already registered in the node information table 52b of the adapter device 57.

  In FIG. 16, the CEC frame generated by the CEC controller 14 of the source device 1A is output to the controller 10A via the bus B1, and then transmitted to the adapter device 57 via the controller 10A, the wired transmission / reception circuit 55, and the cable C1. Is done. The controller 50 of the adapter device 57 generates a wireless data packet by processing the CEC frame received from the source device 1A via the wired transmission / reception circuit 51 in the same manner as the wireless communication system according to the first embodiment. The wireless data packet is wirelessly transmitted to the adapter device 67 as a wireless data signal through the antenna 56 by the wireless transmission / reception circuit 54. The wireless data signal wirelessly transmitted by the adapter device 57 via the antenna 56 is wirelessly received by the wireless transmission / reception circuit 64 of the adapter device 67 via the antenna 66. When the wireless data packet received wirelessly includes a CEC frame and the destination logical address matches the local logical address of the sink device 2A, the controller 60 of the adapter device 67 passes the wired transmission / reception circuit 61 and the cable C2. After all the CEC frames are transmitted to the sink device 2A, the wireless ACK packet is transmitted to the adapter device 57 via the wireless transmission / reception circuit 64 and the antenna 66. Since the adapter device 57 did not receive the wireless ACK packet within a predetermined time after the transmission of the wireless data packet, the CEC controller 14 performs CEC frame retransmission processing. However, the controller 50 does not transmit the data of the retransmitted CEC frame. Since the wireless ACK packet has already been received from the adapter device 67 when the EOM bit of the block N is received from the CEC controller 14, “0” is transmitted to the data block N without wirelessly transmitting the wireless data packet again. Is transmitted to the CEC controller 14. Therefore, the CEC controller 14 can recognize that the CEC frame has been normally received by the adapter device 67.

  As described above, according to the wireless communication system according to the second embodiment, the CEC controller 14 that generates the CEC frame and the controller 50 are connected to each other via the bus B1 and the cable C1, and the CEC controller 24. Since the controller 60 is connected to each other via the bus B2 and the cable C2, the adapter devices 57 and 67 are also installed in the source device 1A or the sink device 2A having only a wired interface for transmitting and receiving CEC messages. Thus, the CEC frame can be transmitted and received wirelessly.

  According to the wireless communication device, the wireless communication system, and the control method of the wireless communication device according to the present invention, the CEC message is wirelessly communicated, thereby eliminating the wiring for transmitting and receiving the CEC message and making the appearance orderly. A CEC message can be easily transmitted from one wireless communication device to a plurality of wireless communication devices without switching.

  The wireless communication device, the wireless communication system, and the wireless communication device control method according to the present invention are used when, for example, an AV system such as a DVD player and a television receiver wirelessly communicates a CEC message defined by the HDMI standard. can do.

1 is a block diagram illustrating a configuration of a wireless communication system according to a first embodiment of the present invention. It is a table which shows an example of the node information table 12b stored in ROM11 of FIG. It is a table which shows an example of the transmission data information table 12a stored in RAM12 of FIG. 2 is a configuration diagram showing an example of a format of a wireless data packet 1000. FIG. FIG. 5 is a configuration diagram showing an example of a format of a CEC frame area 700 in FIG. 4. FIG. 6 is a configuration diagram illustrating an example of a format of a header block and a data block 800 in FIG. 5. 3 is a flowchart showing address information registration processing by a controller 10 of the source device 1 of FIG. 1. It is a flowchart which shows the data transmission / reception process by the controller 10 of the source device 1 of FIG. 3 is a flowchart showing data transmission / reception processing by a controller 20 of the sink device 2 of FIG. 1. FIG. 2 is a sequence diagram illustrating signals of respective units of the wireless communication system in FIG. 1 when CEC message retransmission processing is not performed. FIG. 2 is a sequence diagram illustrating signals of respective units of the wireless communication system in FIG. 1 when CEC message retransmission processing is performed. 6 is a flowchart showing another data transmission / reception process by the controller 20 of the sink device 2 of FIG. 1. FIG. 3 is another sequence diagram showing signals at various parts of the wireless communication system in FIG. 1. 6 is a flowchart showing another data transmission / reception process by the controller 10 of the source device 1 of FIG. 1. It is a block diagram which shows the structure of the radio | wireless communications system which concerns on the 2nd Embodiment of this invention. FIG. 16 is a sequence diagram illustrating signals of respective units of the wireless communication system in FIG. 15.

Explanation of symbols

1, 1A ... source device,
2, 2A ... sink device,
10, 20, 10A, 20A, 50, 60 ... controller,
11,21 ... ROM,
11a, 21a ... Local node node information,
12, 27, 52, 62 ... RAM,
12a, 27a, 52a, 62a ... transmission data information table,
12b, 27b, 52b, 62b ... node information table,
13 ... DVD player,
14, 24 ... CEC controller,
15, 25, 54, 64 ... wireless transmission / reception circuit,
16, 26, 56, 66 ... antenna,
22 ... Speaker,
23 ... Display,
30. Audio signal and video signal processing circuit,
51, 55, 61, 65 ... wired transmission / reception circuit,
57, 67 ... Adapter device.

Claims (12)

A wireless communication system including a plurality of adapter wireless communication devices including first and second adapter wireless communication devices and transmitting / receiving a CEC message defined in the HDMI standard and included in a CEC frame generated by an AV device In the first adapter wireless communication device,
Control means for generating a wireless data packet including a CEC message in the generated CEC frame;
A wireless signal including the generated wireless data packet is wirelessly transmitted to the second adapter wireless communication device, and in response to a wireless data packet in the wirelessly transmitted wireless signal, from the second adapter wireless communication device Wireless transmitting / receiving means for receiving a wireless signal including a wireless reception response packet to be wirelessly transmitted;
A table including the CEC logical address of each device constituting the wireless communication system,
The control means receives the header block of the CEC frame from the CEC control means, determines whether the destination logical address included in the header block is registered in the table,
An adapter wireless communication apparatus, wherein if the destination logical address is not registered in the table, the process is terminated without outputting a predetermined reception response signal to the CEC control means.   The adapter wireless communication apparatus according to claim 1, wherein the AV apparatus and the control unit are connected to each other via a wire.   When the control means receives a wireless reception response packet from the second adapter wireless communication device within a predetermined time, it outputs a predetermined reception response signal to the AV device, while the wireless data packet within a predetermined time. 3. The adapter wireless communication according to claim 1, wherein when the wireless reception response packet from the second adapter wireless communication device is not received, output of the reception response signal to the AV device is stopped. apparatus. When the AV device does not detect the reception response signal from the control means within a predetermined time after the output of the CEC frame, the AV device re-outputs the CEC frame,
When the control means receives the CEC frame re-output by the AV device and has already received the wireless reception response packet for the wireless data packet, the control means stops wireless transmission of the wireless data packet 4. The adapter wireless communication apparatus according to claim 3, wherein the reception response signal is output to the AV apparatus. Storage means for storing a transmission data information table for storing at least a part of a CEC frame in the wireless data packet and a reception status indicating whether or not the wireless response reception packet for the wireless data packet is received. In addition,
When the control means wirelessly transmits a wireless signal including the wireless data packet, the control means stores at least a part of the CEC frame in the wireless data packet in the transmission data information table and wirelessly receives the wireless response reception packet. 5. The adapter wireless communication apparatus according to claim 4, wherein the reception status indicating that the wireless response reception packet for the wireless data packet is received is stored.   The control means, when a CEC frame generated by the AV device is input, outputs a predetermined reception response signal to the AV device when the destination is a wirelessly connected destination. The adapter wireless communication device according to 1 or 2. The CEC frame includes at least one block having a predetermined format;
The control means outputs the reception response signal to the AV device when the block is not the final block, and wirelessly transmits the wireless data packet when the block is the final block. The adapter radio | wireless communication apparatus as described in any one of thru | or 6.   When the wireless transmitting / receiving unit receives a wireless signal of a wireless data packet wirelessly transmitted from the second adapter wireless communication device, the control unit includes a second adapter included in the CEC frame in the wireless data packet. A transmission source logical address of the wireless communication apparatus is set as a CEC logical address, a transmission source device ID in the wireless data packet is set as a wireless device ID, and the CEC logical address and the wireless device ID are associated with each other as a pair, 8. A CEC physical address is assigned to the associated pair, and then the CEC physical address and the corresponding pair are stored in the storage unit as the table. The adapter wireless communication device described in 1.   A wireless communication system comprising a plurality of adapter wireless communication devices according to any one of claims 1 to 8. A wireless communication system including a plurality of adapter wireless communication devices including first and second adapter wireless communication devices and transmitting / receiving a CEC message defined in the HDMI standard and included in a CEC frame generated by an AV device In the control method of the first adapter wireless communication device,
Generating and outputting a CEC frame including a CEC message;
Generating a wireless data packet including a CEC message in the generated CEC frame;
A wireless signal including the generated wireless data packet is wirelessly transmitted to the second adapter wireless communication device, and in response to a wireless data packet in the wirelessly transmitted wireless signal, from the second adapter wireless communication device Receiving a wireless signal including a wireless reception response packet transmitted wirelessly;
Determining whether a header block of the CEC frame is input and a destination logical address included in the header block is registered in a table including a CEC logical address of each device constituting the wireless communication system;
And a step of ending the processing without outputting a predetermined reception response signal for the CEC frame when the destination logical address is not registered in the table. .   When a wireless reception response packet is received from the second adapter wireless communication device within a predetermined time, a predetermined reception response signal is output, while the second adapter wireless communication device for the wireless data packet is output within a predetermined time 11. The method of controlling an adapter wireless communication apparatus according to claim 10, further comprising the step of stopping outputting the reception response signal when no wireless reception response packet is received. Re-outputting the CEC frame when a reception response signal from the control means is not detected within a predetermined time after the output of the CEC frame;
When the re-output CEC frame is input, if the wireless reception response packet for the wireless data packet has already been received, wireless transmission of the wireless data packet is stopped, and the reception response signal is output. The method for controlling an adapter wireless communication apparatus according to claim 11, further comprising a step of:

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