JP5055651B2 - Content transmission / reception system, content transmission / reception device, content reception device, program thereof, and authentication method thereof - Google Patents

Description

  The present invention relates to a content transmission / reception system including a content transmission / reception device to which a content transmission device can be connected and a content reception device to which the content transmission / reception device can be connected.

  Recently, a content transmission / reception system including a DVD player that is a source device (content transmission device) compliant with the HDMI standard, an AV amplifier that is a repeater device (content transmission / reception device), and a display device that is a sink device (content reception device). By including video data and audio data in HDMI data output from a source device, both video data and audio data can be transmitted to a repeater device or a sink device using a single HDMI cable. . The AV amplifier converts the HDMI data received from the DVD player into the original video data and audio data, amplifies the audio data and outputs it to the speaker, converts the video data into HDMI data again, and transmits it to the display device. . The display device converts the received HDMI data into the original video data and displays it.

HDMI data transmitted and received by these devices is HDCP (High-bandwidth Digital).
It is encrypted by Content Protection), and HDMI data is transmitted and received only after successful HDMI authentication between the HDMI transmitting unit and the HDMI receiving unit (Patent Document 1 below). Therefore, when the HDCP authentication fails between the HDMI transmission unit and the HDMI reception unit, the HDMI data is not transmitted.

  Specifically, the DVD player reads AV amplifier authentication information and a repeater bit from the AV amplifier register. The repeater bit is information indicating whether it is a repeater device or a sink device. Here, the repeater bit read from the AV amplifier indicates that it is a repeater device, and the DVD player has information indicating that the AV amplifier has acquired authentication information of a display device connected downstream of the AV amplifier. , Waiting for transmission from the AV amplifier.

  The AV amplifier reads the authentication information of the display device from the register of the display device, and succeeds in authentication with the display device. Further, the AV amplifier transmits information indicating that the authentication information of the display device has been acquired to the DVD player. In response to this, the display device reads the authentication information of the display device from the register of the AV amplifier, and succeeds in the authentication with the AV amplifier based on the authentication information of the AV amplifier and the display device.

JP 2007-288247 A

  Video data included in HDMI data transmitted from the DVD player to the AV amplifier may be data attached to audio data such as a still image. In such a case, the user only needs to be able to output sound from the AV amplifier through the speaker, and when it is not desired to display the attached still image on the display device, the display device is turned off (standby state). There are things to do. At this time, the AV amplifier fails in HDCP authentication with the display device, whereby the DVD player also fails in HDCP authentication with the AV amplifier. As a result, the HDMI data is not transmitted from the DVD player to the AV amplifier. Can no longer output audio. Hereinafter, the reason why HDCP authentication fails will be described in detail.

  The AV amplifier can determine the operation state of the display device to some extent based on the hot plug signal output from the display device. That is, if the hot plug signal is at a low level, it can be determined that the display device is not active (a state in which HDMI data can be received and processed) or that the display device is not connected. On the other hand, if the hot plug signal is at a high level, it can be determined that the display device is connected, but it cannot be determined whether or not the display device is active. This is because it depends on the specifications of the display device.

  Therefore, if the hot plug signal from the display device is at a high level, the AV amplifier estimates that the display device is active, and tries HDCP authentication to transmit HDMI data to the display device. Here, when the power of the display device is turned off, the hot plug signal from the display device is inverted to a low level and then inverted to a high level. When the hot plug signal of the display device is inverted from the low level to the high level, the AV amplifier and the DVD player attempt HDCP authentication again.

  However, as described above, when the display device is turned off and is not active, the authentication information of the display device cannot be read from the register of the display device, so the AV amplifier fails in HDCP authentication with the display device.

  Here, in the HDMI standard, when a repeater device such as an AV amplifier fails in HDCP authentication with a sink device such as a display device, the source device must also fail in HDCP authentication. ing. That is, in the case where at least one unauthorized device that fails the HDMI authentication is connected among the devices connected to each other via the HDMI cable, the source device does not output the HDMI data, so that the HDMI data is not output. Prevents unauthorized transmission of data.

  As a result, the AV amplifier that has failed the HDCP authentication with the display device also causes the DVD player to fail the HDCP authentication. Specifically, the DVD player reads AV amplifier authentication information and repeater bits from the AV amplifier register. Here, since the repeater bit read from the AV amplifier is a repeater device, in order for the DVD player to read the authentication information of the display device, information indicating that the AV amplifier has acquired the authentication information of the display device is received from the AV amplifier. Wait for it to be sent. However, since the AV amplifier cannot read the authentication information from the display device, the DVD player cannot read the display device authentication information from the AV amplifier, and as a result, authentication with the AV amplifier fails.

  Therefore, the DVD player does not transmit HDMI data to the AV amplifier, and as a result, the AV amplifier cannot output audio data included in the HDMI data. Therefore, when the user turns off the display power, no sound is output from the speaker connected to the AV amplifier, and it is not possible to listen only to music using the AV amplifier.

  Such a problem also applies when the input selector of the display device is switched from the AV amplifier to another device or a TV tuner when a plurality of source devices or repeater devices are connected to the display device. To occur.

  An object of the present invention is to provide a DVD player (content transmission device) even when the AV amplifier (content transmission / reception device) cannot authenticate with the display device (content reception device), for example, when the display device is turned off. It is to provide a content transmission / reception system capable of transmitting content data from an AV amplifier to an AV amplifier.

  A content transmission / reception system according to a preferred embodiment of the present invention includes a content transmission / reception device connectable to a content transmission device and a content reception device connectable to the content transmission / reception device. Content receiving means for receiving content data, content transmitting means for transmitting the content data to the content receiving apparatus, authentication means for authenticating with the content receiving apparatus, and the content transmitting / receiving apparatus receiving the content data A device information storage unit for storing device information indicating whether the device is a first device that can be transmitted to the device or a second device that cannot transmit the content data to the content receiving device; The operation state that fails to authenticate with the content receiving device A notification receiving means for receiving notification from the content receiving apparatus that the content receiving apparatus is to be transferred, a determination means for determining whether or not the notification receiving means has received the notification, and the notification by the determination means. And setting means for changing the device information stored in the device information storage means from the first device to the second device when it is determined that the content information has been received. Second content receiving means for receiving the content from the transmission / reception device; and second determination means for determining whether or not the content receiving device shifts to an operating state in which the authentication means fails to authenticate with the content receiving device; When the second determination unit determines to shift to the operation state, the content reception device shifts to an operation state in which the authentication unit fails to authenticate with the content reception device. The notification to the effect that, and a notification sending means for sending to the content transmitting and receiving device.

  When the content receiving apparatus determines that the content transmitting / receiving apparatus shifts to an operation state in which the content transmitting / receiving apparatus fails to authenticate with the content receiving apparatus, the content receiving apparatus transmits a notification to that effect to the content transmitting / receiving apparatus. When receiving the notification, the content transmitting / receiving apparatus changes the device information from the first device to the second device. Therefore, the content transmission device acquires device information from the content transmission / reception device and determines that the content transmission / reception device is the second device. Therefore, the authentication with the content transmission / reception device is based only on the authentication information of the content transmission / reception device. To succeed. That is, when the content transmission apparatus authenticates with the content transmission / reception apparatus, the authentication information of the content reception apparatus becomes unnecessary. Therefore, even if the content receiving apparatus shifts to an operation state in which the content transmitting / receiving apparatus cannot be authenticated with the content receiving apparatus, the content transmitting apparatus succeeds in authentication with the content transmitting / receiving apparatus, and the content transmitting apparatus transmits content to the content transmitting / receiving apparatus. Data can be transmitted.

  In a preferred embodiment, an operation state in which the authentication unit fails to authenticate with the content receiving device is a power-off state or a standby state of the content receiving device, or the second content receiving unit sends the content transmitting / receiving device to the second content receiving unit. In this state, content data other than the content data to be transmitted is selectively received.

  In this case, even if the content receiving apparatus is shifted to a power-off state (or standby state), or the content receiving apparatus is shifted to a state in which content other than content from the content transmitting / receiving apparatus is received, the content transmitting apparatus Since the authentication with the content transmission / reception device is successful, the content transmission / reception device can receive and reproduce the content data from the content device.

  In a preferred embodiment, the content transmission / reception device further includes a hot plug signal output means for outputting a hot plug signal to the content transmission device, the notification reception means, and the authentication means and the content reception device. When the notification indicating that the content receiving apparatus shifts to an operation state in which the authentication fails, the hot plug signal output means sets the hot plug signal to a low level, and the device information is set by the setting means. After changing to 2 devices, the hot plug signal is set to high level.

  In this case, when the content transmitting / receiving device receives the notification from the content receiving device, the hot plug signal is changed to the low level, the device information is changed to the second device, and then the hot plug signal is set to the high level. The content transmitting apparatus authenticates with the content transmitting / receiving apparatus, regards the content transmitting / receiving apparatus as the second device, and transmits content data to the content transmitting / receiving apparatus.

  In a preferred embodiment, the content transmission device includes device information reading means for reading the device information from the device information storage means, and second authentication means for authenticating with the content transmission / reception device, and the read device information. Is the first device, the second authentication means can acquire the content transmission / reception device when the authentication information of the content transmission / reception device and the authentication information of the content reception device can be acquired from the content transmission / reception device. When authentication with the device is successful and authentication information of the content receiving device cannot be obtained from the content transmitting / receiving device, authentication with the content transmitting / receiving device fails, and the read device information is the second device When the second authentication means can acquire authentication information only for the content transmission / reception device, A successful proof.

  An operation program for a content receiving apparatus according to a preferred embodiment of the present invention includes: a step of determining whether or not the content receiving apparatus shifts to an operation state in which the authentication unit fails to authenticate with the content receiving apparatus; A step of transmitting, to the content transmitting / receiving device, a notification that the content receiving device shifts to an operating state in which the authentication unit fails to authenticate with the content receiving device when it is determined to shift to a state. Let it run.

  The operation program of the content transmission / reception device according to a preferred embodiment of the present invention receives a notification from the content reception device that the content reception device shifts to an operation state in which the authentication unit fails to authenticate with the content reception device. A first device capable of transmitting the content data to the content receiving device, the device information stored in the device information storage means when it is determined that the notification has been received; And causing the computer to execute a step of changing the content data to a second device that cannot be transmitted to the content receiving device.

  The program may be provided to the content transmission / reception device or the content reception device in the form of firmware update via a network or a recording medium, or may be provided in the form of an electronic component that stores the program.

  An authentication method according to a preferred embodiment of the present invention is an authentication method in a content transmission / reception system including a content transmission device, a content transmission / reception device connected to the content transmission device, and a content reception device connected to the content transmission / reception device. A step of transmitting a notification from the content receiving device to the content transmitting / receiving device when the content receiving device shifts to an operation state in which the content transmitting / receiving device fails to authenticate with the content receiving device; When the notification is received in the content transmitting / receiving device, the device information stored in the device information storage means is transmitted from the first device capable of transmitting the content data to the content receiving device. Step of changing to a second device that cannot be transmitted to the receiving device A step of acquiring the device information from the content transmitting / receiving device in the content transmitting device and determining that the device information is the second device; and the content transmitting device receiving the content from the content transmitting / receiving device. Obtaining authentication information of the transmission / reception device and executing authentication with the content transmission / reception device.

  Even if the content receiving apparatus shifts to an operation state in which the content transmitting / receiving apparatus cannot be authenticated with the content receiving apparatus, the content transmitting apparatus succeeds in authentication with the content transmitting / receiving apparatus, and content data is transferred from the content transmitting apparatus to the content transmitting / receiving apparatus. Can be sent.

  Hereinafter, a content transmission / reception system including a content transmission device (source device, DVD player), a content transmission / reception device (repeater device, AV amplifier) and a content reception device (sink device, display device) according to a preferred embodiment of the present invention will be described. Although specifically described with reference, the present invention is not limited to these embodiments. In this example, content data is a generic name for data including video (image) data and / or audio data, and is, for example, HDMI data.

  FIG. 1A is a principal block diagram showing the configurations of the DVD player 10 and the AV amplifier 20, and FIG. The DVD player 10, the AV amplifier 20, and the display device 30 comply with the HDMI standard, for example, and are connected to each other via an HDMI cable.

[Configuration of DVD Player 10]
First, the DVD player 10 will be described with reference to FIG. 1A. The DVD player 10 includes a reproduction unit 11, a resolution conversion unit 12, an HDMI transmission unit 13, a system control unit 14, an operation display unit 15, a memory 16, and a connector unit 17.

  The playback unit 11 reads out video data recorded on a DVD disc (hereinafter simply referred to as a disc) from the disc, decodes it, and supplies it to the resolution conversion unit 12. Also, the playback unit 11 reads out audio data recorded on the disc from the disc, decodes it, and supplies it to the HDMI transmission unit 13. The reproducing unit 11 includes an optical pickup, a servo circuit, an MPEG decoder, etc. (not shown).

  The resolution conversion unit 12 determines the resolution of the video data supplied from the reproduction unit 11. In addition, the resolution conversion unit 12 converts the determined resolution of the video data into a resolution set by the user by a command from the system control unit 14. The video data whose resolution has been converted by the resolution conversion unit 12 is supplied to the HDMI transmission unit 13.

  The HDMI transmission unit 13 converts the video data supplied from the resolution conversion unit 12 and the audio data supplied from the playback unit 11 into HDMI standard data (hereinafter referred to as HDMI data) by a command from the system control unit 14. Convert. The HDMI transmission unit 13 encrypts the HDMI data based on the HDCP standard. Also, the HDMI transmission unit 13 reads the authentication information and the repeater bit from the register 21a of the AV amplifier 20 via the DDC line, and executes HDCP authentication. The HDMI transmission unit 13 transmits the HDMI data to the AV amplifier 20 via the connector unit 17 when the HDCP authentication is successful, but does not transmit the HDMI data to the AV amplifier 20 when the HDMI CP authentication fails.

  In HDCP authentication, the HDMI transmission unit 13 reads the authentication information and repeater bit of the AV amplifier 20 from the register 21 a of the AV amplifier 20. If the read authentication information is valid, the HDMI transmission unit 13 succeeds in authentication with the HDMI reception unit 21. The HDMI transmitting unit 13 fails to authenticate with the HDMI receiving unit 21 if the read authentication information is invalid or the authentication information cannot be read.

  The authentication information includes, for example, KSV (key select vector) defined by the HDCP standard. The repeater bit is a repeater device (that is, a device that can transmit HDMI data to another device, the first device), or a sink device (that is, a device that cannot transmit HDMI data to another device, Device information indicating whether the device is a second device), a value of “1” indicates a repeater device, and a value of “0” indicates a sink device.

  The HDMI transmission unit 13 determines whether the repeater bit of the AV amplifier 20 is “1” indicating the repeater device. If the repeater bit is “1”, it is determined that a further device is connected downstream of the device connected to the DVD player 10, and therefore the HDMI transmission unit 13 cannot acquire the authentication information of the downstream device. Authentication fails. That is, when the repeater bit of the AV amplifier 20 is “1”, the HDMI transmission unit 13 sets a timer for reading the authentication information of the display device 30 connected to the AV amplifier 20 from the register 21 a of the AV amplifier 20. To do. When the information indicating that the authentication information of the display device 30 has been acquired is received from the AV amplifier 20 during the timer count, the HDMI transmission unit 13 reads the authentication information of the display device 30 from the register 21 a of the AV amplifier 20. Then, the HDMI transmitting unit 13 confirms the authentication information of the AV amplifier 20 and the authentication information of the display device 20, and if these are valid, the authentication with the AV amplifier 20 is successful.

  On the other hand, when the information indicating that the authentication information of the display device 30 has been acquired is not received from the AV amplifier 20 during the timer count, the HDMI transmitting unit 13 obtains the authentication information of the display device 30 from the register 21a of the AV amplifier 20. Cannot read. As a result, the HDMI transmission unit 13 fails to authenticate with the AV amplifier 20.

  If the repeater bit is “0”, it is determined that no further device is connected downstream of the device connected to the DVD player 10, so only the authentication information of the device directly connected to the DVD player 10 is obtained. Authentication is successful by acquiring. That is, when the repeater bit of the AV amplifier 20 is “0”, the DVD player 10 recognizes that the connected AV amplifier 20 is not a repeater device but a sink device, and displays the authentication information of the display device 30. It is possible to successfully authenticate with the AV amplifier 20 based only on the authentication information of the AV amplifier 20 without having to acquire it.

  The HDMI transmission unit 13 determines TMDS lines for transmitting and receiving HDMI data (normally, there are a plurality of lines, but only one line is shown in FIGS. 1 and 2 for simplicity), and whether or not there is a connection. Is connected to the HDMI receiving unit 21 of the AV receiver 20 through the hot plug. The HDMI transmission unit 13 is connected to the HDMI reception unit 21 and the PROM 25 of the AV amplifier 20 via a DDC line for reading authentication information and EDID.

  The system control unit 14 controls the playback unit 11, the resolution conversion unit 12, the HDMI transmission unit 13, the operation display unit 15, the memory 16, and the like based on the operation program of the DVD player stored in the built-in or connected memory. For example, a microcomputer or a CPU is used. The system control unit 14 executes various processes based on an operation input from the operation display unit 15 or a control signal and data from each unit.

  The system control unit 14 is connected to the system control unit 23 of the AV amplifier 20 via the CEC line, and transmits / receives commands and / or data to / from the system control unit 23. Further, the system control unit 14 is connected to the PROM 25 of the AV amplifier 20 via the DDC line, and reads the EDID stored in the PROM 25.

[Configuration of AV amplifier]
Next, the configuration of the AV amplifier 20 will be described with reference to FIG. 1A or FIG. 1B. The AV amplifier 20 includes an HDMI receiving unit 21, an HDMI transmitting unit 22, a system control unit 23, an operation display unit 24, a memory (EDID PROM, hereinafter referred to as PROM) 25, an audio processing unit 26, and a connector. Parts 27 and 28.

  The HDMI receiving unit 21 receives the HDMI data transmitted from the DVD player 10 and decrypts the HDMI data encrypted according to the HDCP standard. Further, the HDMI receiving unit 21 generates original video data (video data before HDMI conversion) from the received HDMI data, and supplies the generated video data to the HDMI transmitting unit 22. Further, the HDMI receiving unit 21 generates original audio data from the received HDMI data and supplies the original audio data to the audio processing unit 26.

  The HDMI receiving unit 21 includes a register (storage element) 21a, and authentication information and a repeater bit of the AV amplifier 20 are registered in advance in the register 21a. In the HDCP authentication, the HDMI receiving unit 21 reads the authentication information and the repeater bit registered in the register 21 a by the HDMI transmitting unit 13 of the DVD player 10. The repeater bit can be changed to “1” or “0” by the system control unit 23.

  The HDMI transmitting unit 22 converts the video data supplied from the HDMI receiving unit 21 and the audio data supplied from the audio processing unit 26 as necessary into HDMI data. The HDMI transmission unit 22 encrypts the HDMI data based on the HDCP standard. Further, the HDMI transmission unit 22 reads the authentication information of the display device 30 from the register 31a of the display device 30 via the DDC line, and executes HDCP authentication. The HDMI transmission unit 22 transmits the HDMI data to the display device 30 via the connector unit 28 when the HDMI CP authentication is successful, but does not transmit the HDMI data to the display device 30 when the HDMI CP authentication fails.

  In the HDCP authentication, the HDMI transmission unit 22 reads the authentication information of the display device 30 from the register 31a of the display device 30. If the authentication information of the display device 30 is valid, the HDMI transmission unit 22 succeeds in the HDCP authentication with the HDMI reception unit 31. If the authentication information of the display device 30 is invalid or the authentication information cannot be read, the HDMI transmitting unit 22 fails in the HDCP authentication with the HDMI receiving unit 31.

  Further, the authentication information of the display device 30 acquired from the display device 30 is written in the register 21a of the HDMI receiving unit 21, for example. Information indicating that the authentication information of the display device 30 has been acquired is transmitted from the HDMI receiving unit 21 to the HDMI transmitting unit 13 of the DVD player 10. As a result, the HDMI transmission unit 13 of the DVD player 10 reads the authentication information of the display device 30 from the register 21a of the HDMI reception unit 21.

  The HDMI transmission unit 22 is connected to the HDMI reception unit 31 of the display device 30 via a TMDS line and a hot plug. The HDMI transmission unit 22 is connected to the PROM 34 and the HDMI reception unit 31 of the display device 30 via a DDC line.

  The audio processing unit 26 performs processing such as signal processing, amplification processing, and D / A conversion on the audio data supplied from the HDMI receiving unit 21, and supplies the audio signal to the speaker 60 connected to the outside. . Further, the audio processing unit 26 supplies audio data to the HDMI transmission unit 22 as necessary.

  The system control unit 23 controls the HDMI reception unit 21, the HDMI transmission unit 22, the operation display unit 24, the PROM 25, the audio processing unit 26, and the like based on an AV amplifier operation program stored in a built-in or connected memory. For example, a microcomputer or a CPU is used. The system control unit 23 executes various processes based on an operation input from the operation display unit 24 or a control signal and data from each unit.

  The system control unit 23 is connected to the system control unit 14 of the DVD player 10 via the CEC line, and transmits and receives commands and data to and from the system control unit 14. The system control unit 23 is connected to the system control unit 33 of the display device 30 via the CEC line, and transmits and receives commands and data to and from the system control unit 33.

  The system control unit 23 notifies the system control unit 33 of the display device 30 that “the display device 30 shifts to an operation state in which the AV amplifier 20 fails in HDCP authentication with the display device 30” (details will be described later). Is received, the DVD player 10 recognizes that it is not a repeater device but a sink device, thereby maintaining HDCP authentication with the AV amplifier 20 in the DVD player 10.

  Specifically, when receiving the notification from the system control unit 33, the system control unit 23 changes the repeater bit of the register 21a of the HDMI receiving unit 21 from “1” indicating the repeater device to “0” indicating the sink device. To do. Further, the HDMI receiving unit 21 sets the hot plug signal for the DVD player 10 to a low level and then sets it to a high level. When the hot plug signal becomes high level, the HDMI transmission unit 13 of the DV player 10 tries to authenticate with the HDMI reception unit 31. At this time, the repeater bit acquired from the HDMI reception unit 21 is “0” indicating the sink device. It has become. Therefore, even if the DVD player 10 cannot read the authentication information of the display device 30, the HDMI transmitting unit 13 recognizes that the AV amplifier 20 is a sink device, so that only the authentication information of the AV amplifier 20 is used. Authentication with the HDMI receiving unit 21 can be successful.

[Configuration of Display Device 30]
Next, the display device 30 will be described with reference to FIG. 1B. The display device 30 includes an HDMI receiving unit 31, a display unit 32, a system control unit 33, a memory (EDID PROM, hereinafter referred to as PROM) 34, an operation unit 35, an audio processing unit 36, and a speaker 37. And a connector portion 38.

  The HDMI receiving unit 31 receives the HDMI data transmitted from the HDMI transmitting unit 22 of the AV amplifier 20 and decrypts the HDMI data encrypted by HDCP. In addition, the HDMI receiving unit 31 generates original video data from the received HDMI data and supplies it to the display unit 32. In addition, the HDMI receiving unit 31 generates original audio data from the HDMI data and supplies it to the audio processing unit 36.

  The HDMI receiving unit 31 includes a register (storage element) 31a, and authentication information of the display device 30 is registered in advance in the register 31a. In the HDCP authentication, the HDMI receiving unit 31 reads out its own authentication information registered in the register 31 a by the HDMI transmitting unit 22 of the AV amplifier 20.

  The display unit 32 is supplied with video data from the HDMI receiving unit 31 and displays video based on the video data, and is, for example, an LCD or a CRT.

  The audio processing unit 36 performs processing such as signal processing, amplification processing, and D / A conversion on the audio data supplied from the HDMI receiving unit 31 and supplies the processed audio data to the speaker 37.

  The system control unit 33 controls the HDMI receiving unit 31, the display unit 32, the PROM 34, the audio processing unit 36, and the like based on an operation program of the display device stored in a built-in or connected memory. A microcomputer or a CPU. The system control unit 33 executes various processes based on an operation input from the operation unit 35 or a control signal and data from each unit.

  When the display device shifts to an operation state in which the AV amplifier 20 fails in HDCP authentication with the display device 30, the system control unit 33 indicates that “the AV amplifier 20 fails in HDCP authentication with the display device 30. A notification that “the display device 30 shifts to the operating state” is transmitted to the system control unit 23 of the AV amplifier 20 via the CEC line. Such an operation state is that the display device 30 is shifted to a power-off state (specifically, a standby state in which the power supply voltage is supplied only to the system control unit 33 or the operation unit 35), or the selector circuit is an AV amplifier. 20 is a state in which the HDMI data input from 20 is not selected (that is, content data other than the HDMI data from the AV amplifier 20 is selected). This is because the HDMI transmission unit 22 of the AV amplifier 20 cannot read the authentication information from the register 31a of the HDMI reception unit 31 in such an operation state.

  Here, the selector circuit will be described with reference to FIG. For example, the AV amplifier 20 and the game machine 40 are connected to the display device 30 via an HDMI cable, and the set top box 50 is connected via an optical cable and a DVI cable. Further, when the display device 30 is a TV receiver, a tuner circuit 39 is provided. The display device 30 is a selector circuit that selectively receives one content data from among the content data input from the AV amplifier 20, the game machine 40, and the set top box 50 and the content data received by the tuner circuit 39. 40.

  The selector circuit 40 has a plurality of selection states (in this example, selection states 1 to 4), the selection state 1 is assigned to the input terminal to which the AV amplifier 20 is connected, and the selection state 2 is determined by the game machine 40. The selection state 3 is assigned to the input terminal to which the set top box 50 is connected, and the selection state 4 is assigned to the tuner circuit 39. In this case, when the selection state of the selector circuit 40 is changed from the selection state 1 to the selection states 2 to 4, the above-described “operating state in which the AV amplifier 20 fails in HDCP authentication with the display device 30. Corresponds to “Migrate”.

[Operation]
The operation of the present invention will be described below with reference to FIGS.
[Operation of Display Device 30]
FIG. 3 is a flowchart showing the processing of the system control unit 33 of the display device 30. The system control unit 33 determines whether or not the user instruction to enter the power-off state is input and the display device 30 is in the power-off state (or the power-off state) (S1). If it is determined that the power is turned off (YES in S1), the system control unit 33 notifies the system control unit 23 of the AV amplifier 20 via the CEC line that the display device 30 is turned off. A notification is transmitted (S4).

  Further, the system control unit 33 changes the selection state of the selector circuit 36 from the selection state 1 for selecting HDMI data from the AV amplifier 20 to the selection states 2 to 4 for selecting other content data by a user operation. It is determined whether or not (changed or not) (S2). When the selection state is changed to 2 to 4 (YES in S2), the system control unit 33 sets the selection state of the selector circuit other than the AV amplifier to the system control unit 23 of the AV amplifier 20 via the CEC line. A notification to the effect that the state is changed to another selected state is transmitted (S3).

[Operation of AV Amplifier 20]
FIG. 4 is a flowchart showing processing of the system control unit 23 of the AV amplifier 20. When the system control unit 23 receives a command from the system control unit 33 of the display device 30 via the CEC line (YES in S11), the command notifies the display device 30 that the power is turned off or a selector. It is determined whether or not the notification is that the circuit selection state is changed to a selection state other than the AV amplifier (S12).

  If the command is a notification that the display device 30 is in a power-off state or a notification that the selection state of the selector circuit is changed to a selection state other than the AV amplifier (YES in S12), system control When the hot plug signal from the display device 30 changes from the low level to the high level, the unit 23 fails in HDCP authentication with the display device 30, and as a result, the DVD player 10 performs HDCP authentication with itself. Judge that it fails.

  Therefore, the system control unit 23 controls the HDMI transmission unit 22 to stop outputting the HDMI data to the display device 30 (S13). Then, the system control unit 23 sets the hot plug signal for the DVD player 10 to a low level (S14). Subsequently, the system control unit 23 changes the repeater bit in the register 21a of the HDMI receiving unit 21 from “1” indicating the repeater device to “0” indicating the sink device (S15). Subsequently, the system control unit 23 sets the hot plug signal for the DVD player 10 to a high level (S16). This prompts the DVD player 10 to re-authenticate to the AV amplifier 20 and recognizes that the AV amplifier 20 is a sink device. Even when the AV amplifier 20 cannot authenticate with the display device 30, the HDMI data is AV The DVD player 10 is controlled so as to be transmitted to the amplifier 20.

[Operation of DVD Player 10]
FIG. 5 is a flowchart showing the processing of the system control unit 14 and / or the HDMI transmission unit 13 of the DVD player 10. When the hot plug signal from the AV amplifier 20 changes from the low level to the high level (YES in S21), the HDMI transmission unit 13 reads the authentication information and the repeater bit of the AV amplifier 20 from the register 21a of the AV amplifier 20 (S22). ). Subsequently, the HDMI transmission unit 13 determines whether or not the read repeater bit is “1” indicating the repeater device (S23). When the repeater bit is “1” (YES in S23), HDCP authentication is performed based on the authentication information of the AV amplifier 20 and the authentication information of the display device 30 in S24 to S30. Since it is the street, I will omit it here.

  When the repeater bit is “0” (NO in S23), the HDMI transmission unit 13 determines that the AV amplifier 20 is a sink device and that a device to which HDMI data is transmitted is not connected downstream. As a result, the HDMI transmitting unit 13 confirms whether the authentication information of the AV amplifier 20 acquired in S22 is valid, and if it is valid, succeeds in HDCP authentication with the AV amplifier 20 (S25).

  Therefore, even when the display device 30 is turned off or the AV amplifier 20 fails to authenticate with the display device 30 because the selection state of the selector circuit 36 is changed to other than the AV amplifier 20. The DVD player 10 maintains authentication with the AV amplifier 20 and continues to transmit the HDMI data to the AV amplifier 20. Therefore, even in such a state, the AV amplifier can output audio data to the speaker.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment. For example, the authentication information and the repeater bit may not be registered in the register but may be registered in a memory or the like. Further, the HDMI transmitting unit acquires authentication information from the HDMI receiving unit and executes authentication processing. However, the HDMI transmitting unit and the HDMI receiving unit may exchange authentication information with each other and execute authentication processing. . The authentication process may be executed by the system control units. The same applies to the case where a plurality of AV amplifiers are cascade-connected between the DVD player and the display device. In addition, the above notification is not performed via the CEC line, but may be performed via another control communication line, IEEE1394, USB, or the like. Further, the program may be provided in the form of a program for causing a computer to execute the above operations of the DVD player, AV amplifier, and display device, and a recording medium on which the program is recorded. Further, a program for only a part of the operation of the AV amplifier or the display device may be provided to the AV amplifier or the display device in the form of firmware update. Furthermore, it may be provided in the form of an electronic component such as an HDMI transmission unit, an HDMI reception unit, or a system control unit in which a program for only a part of the operation of the AV amplifier or the display device is stored.

  The present invention can be suitably employed in AV amplifiers, display devices, and the like.

1 is a block diagram showing a configuration of a DVD player 10 and an AV amplifier 20 according to a preferred embodiment of the present invention. 1 is a block diagram showing a configuration of an AV amplifier 20 and a display device according to a preferred embodiment of the present invention. It is a schematic block diagram explaining a selector circuit. 4 is a flowchart for explaining the operation of the display device 30. 5 is a flowchart for explaining the operation of the AV amplifier 20. 4 is a flowchart for explaining the operation of the DVD player 10.

Explanation of symbols

10 DVD player 20 AV amplifier 21 HDMI receiver 21a Register (device information storage means)
22 HDMI transmission unit 23 System control unit 25 PROM
30 Display Device 31 HDMI Receiver 31a Register 33 System Controller

Claims (9)

A content transmission / reception system comprising a content transmission / reception device connectable to a content transmission device and a content reception device connectable to the content transmission / reception device,
The content transmitting / receiving device
Content receiving means for receiving content data from the content transmitting device;
Content transmitting means for transmitting the content data to the content receiving device;
Authentication means for authenticating with the content receiving device;
Device information indicating whether the content transmitting / receiving device is a first device capable of transmitting the content data to the content receiving device or a second device capable of transmitting the content data to the content receiving device. Device information storage means for storing
A notification receiving means for receiving from the content receiving apparatus a notification that the content receiving apparatus shifts to an operating state in which the authentication means fails to authenticate with the content receiving apparatus;
Determining means for determining whether the notification receiving means has received the notification;
A setting unit that changes the device information stored in the device information storage unit from the first device to the second device when the determination unit determines that the notification is received;
The content receiving device is
Second content receiving means for receiving the content from the content transmitting / receiving device;
Second determination means for determining whether or not the content receiving apparatus shifts to an operation state in which the authentication means fails to authenticate with the content receiving apparatus;
When it is determined by the second determining means to shift to the operation state, the content transmitting / receiving apparatus notifies the content receiving apparatus that the authenticating means shifts to an operating state in which authentication with the content receiving apparatus fails. A content transmission / reception system comprising:   The operating state in which the authentication unit fails to authenticate with the content receiving device is a power-off state or a standby state of the content receiving device, or content data other than content data transmitted from the content transmitting / receiving device to the second content receiving unit The content transmission / reception system according to claim 1, wherein the content data is selectively received. The content transmission / reception device further includes hot plug signal output means for outputting a hot plug signal to the content transmission device,
When the notification receiving means receives a notification that the content receiving apparatus shifts to an operating state in which the authentication means fails to authenticate with the content receiving apparatus, the hot plug signal output means The content transmission / reception system according to claim 1 or 2, wherein the hot plug signal is set to a high level after the device information is changed to the second device by the setting means. The content transmission device includes device information reading means for reading the device information from the device information storage means, and second authentication means for authenticating with the content transmission / reception device,
When the read device information is the first device, the second authentication unit can obtain the content transmission / reception device authentication information and the content reception device authentication information from the content transmission / reception device. When authentication with the content transmission / reception device is successful and authentication information of the content reception device cannot be acquired from the content transmission / reception device, authentication with the content transmission / reception device fails.
When the read device information is the second device, the second authentication unit succeeds in authentication with the content transmitting / receiving device when the authentication information of only the content transmitting / receiving device is acquired. The content transmission / reception system in any one of 1-3. The content reception device in the content transmission / reception system according to claim 1,
Second content receiving means for receiving content from the content transmitting / receiving device;
Second determination means for determining whether or not the content reception apparatus shifts to an operation state in which the authentication means fails to authenticate with the content reception apparatus;
When it is determined by the second determining means to shift to the operation state, the content transmitting / receiving apparatus notifies the content receiving apparatus that the authenticating means shifts to an operating state in which authentication with the content receiving apparatus fails. A content receiving apparatus, comprising: a notification transmitting unit configured to transmit to A computer program for operating the content receiving device according to claim 5,
Determining whether the content receiving apparatus shifts to an operation state in which the authentication unit fails to authenticate with the content receiving apparatus;
A step of transmitting to the content transmitting / receiving device a notification that the content receiving device shifts to an operating state in which the authentication unit fails to authenticate with the content receiving device when it is determined to shift to the operating state. An operation program for a content receiving apparatus to be executed by a computer. A content transmitting / receiving device to which a content transmitting device and a content receiving device can be connected,
Content receiving means for receiving content data from the content transmitting device;
Content transmitting means for transmitting the content data to the content receiving device;
Authentication means for authenticating with the content receiving device;
Device information indicating whether the content transmitting / receiving device is a first device capable of transmitting the content data to the content receiving device or a second device capable of transmitting the content data to the content receiving device. Device information storage means for storing
A notification receiving means for receiving from the content receiving apparatus a notification that the content receiving apparatus shifts to an operating state in which the authentication means fails to authenticate with the content receiving apparatus;
Determining means for determining whether the notification receiving means has received the notification;
Content transmission / reception comprising: a setting unit that changes the device information stored in the device information storage unit from the first device to the second device when the determination unit determines that the notification has been received. apparatus. A computer program for operating the content transmitting / receiving apparatus according to claim 7,
Determining from the content receiving device whether or not the authentication means has received a notification that the content receiving device has transitioned to an operating state in which authentication with the content receiving device fails.
When it is determined that the notification is received, the device information stored in the device information storage means is transmitted from the first device capable of transmitting the content data to the content receiving device, and the content data is transmitted to the content receiving device. An operation program for a content transmission / reception device that causes a computer to execute a step of changing to a second device that cannot be transmitted to the computer. An authentication method in a content transmission / reception system comprising a content transmission device, a content transmission / reception device connected to the content transmission device, and a content reception device connected to the content transmission / reception device,
Transmitting the notification from the content receiving device to the content transmitting / receiving device when the content receiving device shifts to an operation state in which the content transmitting / receiving device fails to authenticate with the content receiving device;
In the content transmission / reception device, when the notification is received, the device information stored in the device information storage unit is received, and the content data is received from the first device capable of transmitting the content data to the content reception device. Changing to a second device that cannot be transmitted to the device;
In the content transmission device, obtaining the device information from the content transmission / reception device, and determining that the device information is the second device;
An authentication method in a content transmission / reception system, comprising: obtaining authentication information of the content transmission / reception device from the content transmission / reception device and executing authentication with the content transmission / reception device.

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