JP2011077640A - Radio transmission system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To allow each of two radio communication apparatuses to store identification information of an apparatus to be connected, to facilitate mutual authentication, without connecting the radio communication apparatuses for exchanging the identification information. <P>SOLUTION: A radio communication system prepares a radio transmitter 2 connected to a content output device 1 and a radio receiver 3 connected to a display device 4. The content output from the content output device 1 is output to a display device 4 by establishing radio communication between the radio transmitter 2 and the radio receiver 3. The radio transmitter 2 acquires the identification information from the content output device 1 and stores it, and the radio receiver 3 acquires the same identification information as the identification information acquired by the radio transmitter 2 from the display device 4, and stores it. And, the radio transmitter 2 and the radio receiver 3 perform mutual authentication using the identification information stored in the devices, and then perform radio transmission of the content. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a wireless transmission system, and more specifically, outputs content from a wireless transmitter connected to an apparatus that outputs the content, performs wireless transmission from the wireless transmitter, receives the wireless reception, and wireless reception The present invention relates to a wireless transmission system capable of outputting content on a display device connected to a machine.

  For example, there is provided a wireless transmission system that wirelessly transmits content output from a device such as an STB (set top box) or a recorder, receives the content, and displays and outputs the content on a display device such as a television. The wireless transmission system has two wireless communication devices that perform two-way wireless communication, one wireless communication device is connected to a content output device such as an STB or a recorder, and the other wireless communication device is a display device such as a television. The content output from the content output device is wirelessly transmitted and output by the display device.

  In such a wireless transmission system, the content transmitted from the wireless communication device on the transmission side is unique to the wireless communication device so that it cannot be easily received by another wireless communication device that is not the intended wireless communication device. Identification information is given. Then, the two wireless communication devices acquire and register each other's identification information in advance. Such a process of holding each other's identification information is called pairing.

  When actually transmitting / receiving content between wireless communication devices, the wireless communication devices transmit their own identification information. Then, in the wireless communication device that has received the identification information of the other party, the received identification information is compared with the identification information of the communication partner that has been registered in advance in the wireless communication apparatus, thereby performing mutual authentication. In other words, if the identification information transmitted from the other party matches the identification information held by itself, the registered communication partner is determined to be authenticated and content transmission / reception is permitted. In addition, when transmitting the identification information by wireless communication, it is usually transmitted after being encrypted. In this case, an encryption key for decrypting the identification information is transmitted together with the identification information.

  With regard to the technology for setting identification information between wireless communication devices as described above, for example, in Patent Document 1, wireless communication is performed after authenticating a receiving apparatus by giving identification information to a receiving apparatus using a cable or the like from a transmitting apparatus. A transmission system for enabling easy addition of a receiving apparatus while maintaining security of identification information by performing communication of content information by transmission is disclosed. The receiving device includes an input unit that acquires identification information from the transmitting device via a conductor, and a receiving unit that receives and decodes information wirelessly transmitted from the transmitting device when the identification information permits decoding. .

  Patent Document 2 discloses a content communication system that performs registration and authentication of a partner device when performing wireless communication of content signals. In this system, an interface of a communication device for connecting a content signal output device and an interface of a communication device for connecting a content presentation device are connected by wire, and exchange of identification information and key information is performed by the communication device. Thereafter, when the content signal supplied from the interface is transmitted as a radio signal and the received content signal is supplied from the interface to the content presentation device, the exchanged identification information is exchanged as a second radio signal by the communication device. The exchanged identification information is verified against registered identification information.

Japanese Patent Laid-Open No. 2005-94096 JP 2005-244476 A

  As described above, in a system that transmits content by wireless communication, predetermined communication is performed by holding each other's identification information and exchanging the communication partner's identification information at the time of content communication to authenticate each other. Communication is possible only with the other party. This prevents a third party from easily receiving content that is wirelessly transmitted.

  In addition, when registering identification information of a communication partner in its own wireless communication device, for example, when manufacturing a wireless communication device, specific identification information is assigned to the wireless communication device in advance and registered. A technique for enabling wireless transmission of content only between two wireless communication devices having a pair of identification information is used. However, in this case, it is necessary to always manage the two wireless communication devices as a pair in the manufacturing, distribution, and service processes, and the handling becomes complicated.

  In the techniques of Patent Document 1 and Patent Document 2, it is necessary to connect two wireless communication devices that perform wireless communication to each other with a wired cable and exchange identification information with each other via the wired cable. It was. Such an operation is troublesome for the user, and particularly when one wireless communication device is installed far away from each other, the operation of exchanging identification information accompanying the movement of the wireless communication device is troublesome for the user. In addition, there is a problem that the wireless communication device further requires an interface and switches for exchanging identification information.

  The present invention has been made in view of the above circumstances, and in a system for transmitting content between a wireless communication device connected to a content output device and a wireless communication device connected to a display device, two wireless communication devices are provided. By registering identification information used for communication between wireless communication devices in each wireless communication device without connecting each other and exchanging identification information, mutual authentication of wireless communication devices can be easily performed. It is an object of the present invention to provide a content transmission system that can be used.

  In order to solve the above problem, a first technical means of the present invention includes a first wireless communication device connected to a content output device that outputs content, and a second wireless communication device connected to a display device, A wireless transmission system in which content output from a content output device is output by a display device by performing wireless communication between a first wireless communication device and the second wireless communication device, wherein the first wireless communication The device acquires and stores identification information from the content output device, and the second wireless communication device acquires and stores the same identification information as the identification information acquired by the first wireless communication device from the display device. The wireless communication device and the second wireless communication device are characterized by performing mutual wireless transmission by performing mutual authentication using the identification information stored in each wireless communication device.

  In the second technical means, when the first technical means performs mutual authentication between the first wireless communication device and the second wireless communication device, each wireless communication device is identified by the wireless communication device of the communication partner. It is determined whether or not the information matches the identification information stored and held by itself, and if they match, it is determined that the authentication of the non-profit line communication device of the communication partner has succeeded, and the first wireless communication device and the first wireless communication device When the two wireless communication devices mutually authenticate the communication partner, the content is wirelessly transmitted.

  The third technical means includes the content output device connected to the first wireless communication device and the display device connected to the second wireless communication device in the first or second technical means, and the content output device And the display device store the same identification information in advance, the content output device transmits the identification information stored therein to the first wireless communication device, and the display device transmits to the second wireless communication device. And transmitting the identification information stored in itself.

According to the present invention, in a system for transmitting content between a wireless communication device connected to a content output device and a wireless communication device connected to a display device, the two wireless communication devices are connected to each other to exchange identification information. Providing a content transmission system that facilitates mutual authentication of wireless communication devices by registering identification information used for communication between wireless communication devices in each wireless communication device without requiring work can do.
Further, according to the present invention, it is not necessary to always manage two wireless communication devices in pairs, and the correspondence in manufacturing, distribution, service, etc. is simplified. In addition, since it is not necessary to exchange identification information between wireless communication devices, interfaces and switches can be reduced.

1 is a diagram conceptually illustrating an embodiment of a wireless transmission system according to the present invention. FIG. 2 is a diagram for explaining processing when content is transmitted in the wireless transmission system of FIG. 1. It is a block diagram which shows the function of each apparatus of the wireless transmission system by this invention. It is a figure for demonstrating the flow of the transmission process of the content in the wireless transmission system which concerns on this invention. It is a flowchart for demonstrating an example of the authentication process at the time of starting of a wireless communication apparatus. It is a flowchart for demonstrating an example of the authentication process at the time of the cable reconnection of a radio | wireless communication apparatus.

FIG. 1 is a diagram for conceptually explaining an embodiment of a wireless transmission system according to the present invention. The wireless transmission system includes a content output device 1 that outputs content, a wireless transmitter 2 that is connected to the content output device 1, a display device 4, and a wireless receiver 3 that is connected to the display device 4. .
The wireless transmitter 2 and the wireless receiver 3 are wireless communication devices capable of bidirectional communication. For the sake of explanation, the wireless transmitter 2 and the wireless receiver 3 will be described as a wireless transmitter 2 that transmits content and a wireless receiver 3 that receives content. These wireless transmitter 2 and wireless receiver 3 correspond to the first wireless communication device and the second wireless communication device of the present invention, respectively.

  The content output device 1 is a device that outputs video / audio content. For example, a tuner device such as an STB (set top box), various recorders or players using a medium such as a BD or DVD, or a game device. Can be applied. The content output from the content device is transferred to the wireless transmitter 2. In this example, the content output device 1 and the wireless transmitter 2 are connected by an HDMI (High-Definition Multimedia Interface) cable. Therefore, the content output device 1 corresponds to a source device in the HDMI standard. Note that the connection between the content output device 1 and the wireless transmitter 2 is not limited to the HDMI cable, and an interface capable of transmitting content may be appropriately employed.

  The content wirelessly transmitted from the wireless transmitter 2 is received by the wireless receiver 3, transferred to the display device 4, and displayed on the display device 4. The wireless receiver 3 and the display device 4 are also connected by an HDMI cable, but other interfaces may be employed. The display device 4 is a device that displays video and is capable of outputting audio, and for example, a monitor, a television device, or a PC is applied. The display device 4 corresponds to a sink device in the HDMI standard.

  In the embodiment according to the present invention, identification information for use in the wireless transmitter 2 is stored in advance in the content output apparatus 1. At the same time, identification information for use in the wireless receiver 3 is stored in the display device 4 in advance. These pieces of identification information are common. The storage processing of the identification information is performed when the content output device 1 and the display device 4 are manufactured. However, the storage processing may be performed after manufacturing these devices.

  Then, the user prepares the wireless transmitter 2 and the wireless receiver 3, the content output device 1 and the display device 4, and performs connection in the form as shown in FIG. 1. At this time, the wireless transmitter 2 acquires the identification information stored in the content output device 1 and stores it in its own storage means. On the other hand, the wireless receiver 3 acquires the identification information stored in the display device 4 and stores it in its storage means. As a result, the wireless transmitter 2 and the wireless receiver 3 store common identification information.

FIG. 2 is a diagram for explaining processing when content is transmitted in the wireless transmission system of FIG. When the wireless transmitter 2 and the wireless receiver 3 store and hold common identification information by the above-described identification information acquisition process, actual content can be transmitted. In this case, first, as shown in FIG. 2A, the wireless transmitter 2 and the wireless receiver 3 perform mutual authentication using the identification information. Here, the wireless transmitter 2 transmits the identification information held by itself to the other party, and the wireless receiver 3 that has received the information collates with the identification information held in advance. As a response to the wireless transmitter 2.
Similarly, the wireless receiver 3 transmits the identification information held by itself to the other party, and the wireless transmitter 2 that has received the identification information collates with the identification information held in advance, and if it matches, the authentication is successful. The response is returned to the wireless receiver 3. Thereby, the mutual authentication between the wireless transmitter 2 and the wireless receiver 3 is completed.

  Then, as shown in FIG. 2B, the content by the video / audio signal output from the content output device 1 is transmitted from the wireless transmitter 2 and received by the wireless receiver 3. The received content is transferred to the display device 4, displayed on the display device 4, and output as audio.

  With such a system, the identification information to be used for communication with each wireless communication device can be transmitted to each wireless communication device without requiring an operation of connecting two wireless communication devices with each other by wire or the like and exchanging the identification information. And the content can be transmitted by mutual authentication using this identification information.

  For example, if the content output device 1 is an STB and the display device 4 is a monitor, the user acquires the STB and the monitor as a set, and further displays the content received by the STB on the monitor with the wireless transmitter 2. The wireless receiver 3 is acquired. In such a case, the identification information authentication process as described above can be performed by holding the common identification information for both the STB and the monitor. Since it is not necessary to register identification information for wireless communication in the wireless transmitter 2 and the wireless receiver 3, it is not always necessary to manage the wireless transmitter 2 and the wireless receiver 3 as a pair in distribution or the like. .

FIG. 3 is a block diagram showing functions of essential parts of each device of the wireless transmission system according to the present invention. In the figure, 1 is a content output device for outputting content, and 2 is a wireless transmitter corresponding to a first wireless communication device. Reference numeral 3 denotes a wireless receiver corresponding to the second wireless communication device, and reference numeral 4 denotes a display device.
The wireless transmitter 2 and the wireless receiver 3 are connected by wireless communication, and the wireless transmitter 2 and the wireless receiver 3 constitute one repeater device. The wireless receiver 3 is HDMI-connected to the display device 4, and the wireless transmitter 2 is HDMI-connected to the content output device 1. Then, by performing wireless communication between the wireless transmitter 2 and the wireless receiver 3, the display device 4 is configured to output content based on video and audio output from the content output device 1.

  The content output device 1 may be any device capable of outputting video and audio. As described above, a tuner device such as STB, various recorders such as BD and DVD, a player, a game device, and the like are applied.

  The content output device 1 includes an HDMI output unit 11 and is HDMI-connected to the wireless transmitter 2. The HDMI output unit 11 is an HDMI I / F for connecting an HDMI cable. The HDMI cable includes a CEC line that is a bidirectional bus for transmitting a common control signal (CEC message) between devices. In addition to the CEC line, the HDMI cable includes a TMDS line for transmitting a digital video / audio signal stream in a differential manner, EDID (Extended Display Identification Data) transmission, HDCP (High- This includes a DDC (Display Data Channel) line used for transmission of an authentication message used for bandwidth Digital Content Protection (authentication).

The content output apparatus 1 includes a memory 13 that stores in advance identification information to be used for communication by the wireless transmitter 2, and a control unit 12 that controls the transmission process of the identification information. The identification information read from the memory 13 by the control unit 12 is output to the wireless transmitter 2 by the HDMI output unit 11. The identification information is transmitted using the CEC line.
Moreover, although the content output apparatus 1 is equipped with the structure for outputting a content according to the aspect, description here is abbreviate | omitted. The content output from the content output device 1 is transmitted from the HDMI output unit 11 to the wireless transmitter 2 via the TMDS line.

  The wireless transmitter 2 includes an HDMI input unit 21, a control unit 22, an HDMI communication processing unit 23, a wireless communication unit 24, and a memory 25. The HDMI input unit 21 is an HDMI I / F for connecting the HDMI cable to the content output apparatus 1 for HDMI connection. By connecting the HDMI output unit 11 and the HDMI input unit 21 via an HDMI cable, the content output device 1 and the wireless transmitter 2 can bidirectionally transmit and receive CEC messages.

  The control unit 22 decodes the CEC message transmitted from the HDMI input unit 21, returns a response to the content output device 1 as necessary, and outputs the decoded CEC message to the wireless communication unit 24 as necessary. Further, the control unit 22 decodes the CEC message transmitted from the wireless communication unit 24, sends the decoded CEC message to the HDMI input unit 21, and transmits it from the HDMI input unit 21 to the content output apparatus 1.

  The HDMI communication processing unit 23 acquires the video and audio input from the HDMI input unit 21, separates these video and audio, and outputs them to the wireless communication unit 24. The wireless communication unit 24 acquires the video and audio output from the HDMI communication processing unit 23, further acquires a CEC message from the control unit 22, and can transmit these video, audio, and CEC messages wirelessly. And wirelessly transmitted to the wireless receiver 3.

The display device 4 may be any device that can display video and output audio, and as described above, a monitor, a television device, a PC, or the like is applied.
The display device 4 includes an HDMI input unit 41 and is HDMI-connected to the wireless receiver 3. The HDMI input unit 41 is an HDMI I / F for connecting an HDMI cable. That is, the HDMI input unit 41 is connected to each line (CEC line, TMDS line, DDC line) included in the HDMI cable.

The display device 4 includes a memory 43 that stores in advance identification information used for communication by the wireless receiver 3, and a control unit 42 that controls identification information transmission processing. The identification information held by the memory 43 is the same as the identification information held by the content output device 1.
The identification information read from the memory 43 by the control unit 42 is output to the wireless receiver 3 by the HDMI input unit 41. The identification information is transmitted using the CEC line. In addition, the display device 4 includes a configuration for outputting (displaying, outputting audio, etc.) the content according to the mode, but description thereof is omitted here.

  The wireless receiver 3 includes a wireless communication unit 31, a control unit 32, an HDMI communication processing unit 33, an HDMI output unit 34, and a memory 35. Upon receiving the video, audio, and CEC message wirelessly transmitted from the wireless transmitter 2, the wireless communication unit 31 converts the video, audio, and CEC message into a format that conforms to the HDMI format, and the HDMI communication processing unit To 33. The CEC message is output to the control unit 32.

  The control unit 32 decodes the CEC message transmitted from the HDMI output unit 34, returns a response to the display device 4 as necessary, and outputs the decoded CEC message to the wireless communication unit 31 as necessary. The control unit 32 decodes the CEC message transmitted from the wireless communication unit 31, sends the decoded CEC message to the HDMI output unit 34, and transmits the decoded CEC message to the display device 4.

  The HDMI communication processing unit 33 acquires the video and audio input from the wireless communication unit 31 and outputs the video and audio to the HDMI output unit 34. The HDMI output unit 34 is an HDMI I / F for connecting an HDMI cable to connect the display device 4 to the HDMI. The HDMI output unit 34 receives video and audio from the HDMI communication processing unit 33, acquires a CEC message from the control unit 32, and outputs the CEC message to the display device 4.

  With the configuration as described above, identification information used for communication by the wireless transmitter 2 is stored in the memory 13 of the content output apparatus 1 in advance. In addition, identification information used for communication by the wireless receiver 3 is stored in the memory 43 of the display device 4 in advance. These pieces of identification information are common. 3 is connected, the wireless transmitter 2 acquires the identification information stored in the content output device 1 and stores it in its own memory 25. On the other hand, the wireless receiver 3 acquires the identification information stored in the display device 4 and stores it in its own memory 35. As a result, common identification information can be stored in the wireless transmitter 2 and the wireless receiver 3 without performing identification information exchange processing between the wireless transmitter 2 and the wireless receiver 3.

  FIG. 4 is a diagram for explaining a flow of content transmission processing in the wireless transmission system according to the present invention. When the wireless transmitter 2 is activated or a cable (in this case, an HDMI cable) connected to the content output device 1 is reconnected, the wireless transmitter 2 performs processing for acquiring identification information from the content output device 1. Here, first, the wireless transmitter 2 requests the content output apparatus 1 for identification information and an encryption key used for encryption / decryption of the identification information (step S1). On the other hand, the content output apparatus 1 transmits the identification information held by itself and the encryption key for encrypting / decrypting the identification information to the wireless transmitter 2 (step S2). The wireless transmitter 2 stores and holds the identification information and the encryption key transmitted from the content output device 1.

  On the other hand, the same processing is performed between the wireless receiver 3 and the display device 4. That is, when the wireless receiver 3 is activated or a cable (here, an HDMI cable) connected to the display device 4 is reconnected, the wireless receiver 3 acquires the identification information and the encryption key from the display device 4. I do. Here, first, the wireless receiver 3 requests the display device 4 for identification information and an encryption key used for encryption / decryption of the identification information (step S3). On the other hand, the display device 4 transmits the identification information held by itself and the encryption key for encrypting / decrypting the identification information to the wireless receiver 3 (step S4). The wireless receiver 3 stores and holds the identification information and the encryption key transmitted from the display device 4.

When the wireless transmitter 2 and the wireless receiver 3 acquire the identification information and the encryption key, the encrypted identification information is transmitted from the wireless transmitter 2 to the wireless receiver 3 (step S5). On the other hand, the wireless receiver 3 decrypts the identification information with the encryption key held by itself and collates it with the identification information stored in the wireless receiver 3. If they match, Ack is returned to the wireless transmitter 2 as a result of successful authentication (step S6).
Next, the wireless receiver 3 transmits the encrypted identification information to the wireless transmitter 2 (step S7). On the other hand, the wireless transmitter 2 decrypts the identification information with the encryption key held by itself and collates it with the identification information stored in itself. If they match, Ack is returned to the wireless receiver 3 as a result of successful authentication (step S8). Thereby, mutual authentication between the wireless transmitter 2 and the wireless receiver 3 is completed.

  Thereafter, the process of actually outputting the content from the content output device 1 and displaying it on the display device 4 can be started. Here, after performing HDCP authentication, transmission of content by video / audio is started. HDCP is a copyright protection technology (copy guard) that encrypts the path for transmitting and receiving digital signals from a video playback device to a display device such as a display and prevents unauthorized copying of content. It is used for interface encryption. The authentication / communication processing for content transmission is the same as the conventional processing, and there is no processing that characterizes the present invention, so detailed description of the processing is omitted.

  FIG. 5 is a flowchart for explaining an example of authentication processing at the time of activation of a wireless communication device (wireless transmitter, wireless receiver). This flow is a process applied to both the wireless transmitter 2 and the wireless receiver 3. Hereinafter, these will be described as wireless communication devices that are collectively referred to. First, when the wireless communication device is activated, the wireless communication device determines whether there is a wired device (step S11). In this case, wired refers to an HDMI cable, and a device connected by wire refers to a source device (content output device 1) or a sink device (display device 4) connected by HDMI. If there is a wired connection device, the wireless communication device requests identification information and an encryption key from the wired connection device by a CEC message (step S12), and uses the identification information and encryption key acquired from the wired connection device. It is held in its own wireless communication device (step S13).

  Next, the wireless communication device encrypts the identification information with the encryption key and transmits it as a wireless signal (step S14). Then, it is confirmed whether or not there is an Ack from the partner wireless communication device for the transmitted wireless signal (step S15), and if there is an Ack, the encrypted identification transmitted from the partner wireless communication device is then transmitted. Information is received and it is determined whether or not the identification information is correct (step S16). Here, the wireless communication device decrypts the identification information transmitted from the partner wireless communication device with the encryption key held by itself, and collates the decrypted identification information with the identification information acquired from the wired connection device in step S13. If they match, it is determined that the identification information transmitted from the counterpart wireless communication device is correct.

  If the identification information transmitted from the partner wireless communication device is not correct, the process returns to step S14, and the identification information is encrypted again with the encryption key and transmitted as a wireless signal. If the identification information transmitted from the partner wireless communication device is correct, the wireless communication device returns Ack to the partner wireless communication device (step S17). As a result, authentication of the partner wireless communication device is successful. Thereafter, authentication processing between the content output device 1 and the display device 4 is performed (HDCP authentication), and wireless transmission of video, audio, and DIP is started (step S18). In DIP (Data Island Packet), control information such as dimming and volume of the sink device (content output device 1) is stored.

  On the other hand, if there is no Ack from the partner wireless communication device in step S15, the identification information transmitted from the partner wireless communication device is received, and it is determined whether or not the identification information is correct (step S19). Here, the wireless communication device decrypts the identification information transmitted from the partner wireless communication device with the encryption key held by itself, and collates the decrypted identification information with the identification information acquired from the wired connection device in step S13. If they match, it is determined that the identification information transmitted from the counterpart wireless communication device is correct.

  If the identification information transmitted from the partner wireless communication device is not correct, the process returns to step S14, and the identification information is encrypted again with the encryption key and transmitted as a wireless signal. If the identification information transmitted from the partner wireless communication device is correct, the wireless communication device returns Ack to the partner wireless communication device (step S20). Then, the identification information is encrypted again with the encryption key held by itself and transmitted as a radio signal (step S21). On the other hand, it is determined whether or not there is an Ack from the partner wireless communication device (step S22). If there is no Ack, the process returns to step S14, and the identification information is encrypted again with the encryption key, and the wireless signal is transmitted. Send as. If there is Ack, authentication of the partner wireless communication device is successful. Thereafter, authentication processing between the content output device 1 and the display device 4 is performed, and wireless transmission of video, audio, and DIP is started (step S18).

FIG. 6 is a flowchart for explaining an example of authentication processing when a wireless communication device (wireless transmitter, wireless receiver) is reconnected to a cable. This flow is also applied to both the wireless transmitter 2 and the wireless receiver 3. Hereinafter, these will be described as wireless communication devices that are collectively referred to.
First, it is determined whether or not the wired communication with the device connected by wire is disconnected while the wireless communication device is wirelessly transmitting, and reconnection has occurred (step S31). In this case, wired refers to an HDMI cable, and a device connected by wire refers to a source device (content output device 1) or a sink device (display device 4) connected by HDMI. If the wired connection is disconnected and reconnected, the wireless communication device requests and acquires identification information and an encryption key from the reconnected wired connection device using a CEC message (step S32). Then, the wireless communication device determines whether or not the identification information and encryption key acquired from the wired connection device are the same as the identification information and encryption key already held in the wireless communication device (step S33). If the acquired identification information and encryption key match the identification information and encryption key held by itself, the content output device 1 and the display device 4 are authenticated (HDCP authentication), and video, audio, The DIP wireless transmission is resumed (step S34).

  In step S33, if the identification information and encryption key acquired from the wired connection device do not match the identification information and encryption key held by itself, the wireless communication device disconnects the wireless communication, Authentication of the wireless communication device is performed again (step S35). In this case, the wireless communication device encrypts the identification information with the encryption key and transmits it as a wireless signal (step S36). Then, it is checked whether or not there is an Ack from the partner wireless communication device for the transmitted wireless signal (step S37), and if there is an Ack, the encrypted identification transmitted from the partner wireless communication device is subsequently sent. Information is received and it is determined whether or not the identification information is correct (step S38). Here, the wireless communication device decrypts the identification information transmitted from the partner wireless communication device with the encryption key held by itself, and collates the decrypted identification information with the identification information acquired from the wired connection device in step S32. If they match, it is determined that the identification information transmitted from the counterpart wireless communication device is correct.

  If the identification information transmitted from the partner wireless communication device is not correct, the process returns to step S36, and the identification information is encrypted again with the encryption key and transmitted as a wireless signal. If the identification information transmitted from the partner wireless communication device is correct, the wireless communication device returns Ack to the partner wireless communication device (step S39). As a result, authentication of the partner wireless communication device is successful. Thereafter, authentication processing between the content output device and the display device is performed, and wireless transmission of video, audio, and DIP is started (step S34).

  On the other hand, if there is no Ack from the partner wireless communication device in step S37, the wireless communication device further receives the identification information transmitted from the partner wireless communication device, and determines whether the identification information is correct (step S40). ). Here, the wireless communication device decrypts the identification information transmitted from the partner wireless communication device with the encryption key held by itself, and collates the decrypted identification information with the identification information acquired from the wired connection device in step S32. If they match, it is determined that the identification information transmitted from the counterpart wireless communication device is correct.

  If the identification information transmitted from the counterpart wireless communication device is not correct, the process returns to step S36, and the identification information is encrypted again with the key information and transmitted as a radio signal. If the identification information transmitted from the partner wireless communication device is correct, the wireless communication device returns Ack to the partner wireless communication device (step S41). Then, the identification information is encrypted again with the encryption key held by itself and transmitted as a radio signal (step S42). On the other hand, it is determined whether or not there is an Ack from the partner wireless communication device (step S43). Send as. If there is Ack, authentication of the partner wireless communication device is successful. Thereafter, authentication processing between the content output device 1 and the display device 4 is performed, and wireless transmission of video, audio, and DIP is started (step S34).

DESCRIPTION OF SYMBOLS 1 ... Content output device, 2 ... Wireless transmitter, 3 ... Wireless receiver, 4 ... Display apparatus, 11 ... HDMI output part, 12 ... Control part, 13 ... Memory, 21 ... HDMI input part, 22 ... Control part, 23 ... HDMI communication processing unit, 24 ... wireless communication unit, 25 ... memory, 31 ... wireless communication unit, 32 ... control unit, 33 ... HDMI communication processing unit, 34 ... HDMI output unit, 35 ... memory, 41 ... HDMI input unit, 42: control unit, 43 ... memory.

Claims (3)

A first wireless communication device connected to a content output device for outputting content; and a second wireless communication device connected to a display device; and between the first wireless communication device and the second wireless communication device. A wireless transmission system configured to cause the display device to output content output from the content output device by performing wireless communication,
The first wireless communication device acquires and stores identification information from the content output device, and the second wireless communication device displays the same identification information as the identification information acquired by the first wireless communication device. Get from and remember,
The wireless transmission system, wherein the first wireless communication device and the second wireless communication device perform mutual wireless transmission by performing mutual authentication using identification information stored in each wireless communication device. 2. The wireless transmission system according to claim 1, wherein when each of the first wireless communication device and the second wireless communication device performs mutual authentication, each wireless communication device receives an identification transmitted from a wireless communication device of a communication partner. It is determined whether or not the information and the identification information stored and held by itself match, and if they match, it is determined that the authentication of the communication lineless communication device of the communication partner is successful,
A wireless transmission system for wirelessly transmitting content when the first wireless communication device and the second wireless communication device mutually authenticate a communication partner. The wireless transmission system according to claim 1 or 2,
A content output device connected to the first wireless communication device; and a display device connected to the second wireless communication device;
The content output device and the display device store the same identification information in advance, and the content output device transmits the identification information stored therein to the first wireless communication device, and the display device A wireless transmission system for transmitting identification information stored therein to the second wireless communication device.

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