JP5928243B2 - Content transceiver - Google Patents

Description

  The present invention relates to a content transmission / reception device such as an AV amplifier.

  A content transmission / reception system including a DVD player or a BD player, an AV amplifier, and a display is known. The DVD player or BD player reproduces the content data recorded on the disc, converts it into HDMI (High Definition Multimedia Interface) data, and transmits it to the AV amplifier via the HDMI cable. The AV amplifier performs predetermined sound processing on the sound data included in the content data, and outputs sound from the speaker. The AV amplifier transmits video data included in the content data to the display. The display performs predetermined video processing on the video data from the AV amplifier and displays it.

  In Patent Document 1 below, when the AV amplifier determines whether or not the display can receive HDMI data from the AV amplifier and determines that the display cannot receive HDMI data from the AV amplifier, HDMI reception is performed. And a technique for reducing power consumption by shifting to a complete standby state in which no power supply voltage is supplied to the HDMI transmission unit. Further, it is described that when it is determined that the display can receive HDMI data from the AV amplifier, the display shifts to a standby through state in which a power supply voltage is supplied to the HDMI receiving unit and the HDMI transmitting unit, and the HDMI data is passed to the display. Yes.

JP 2011-166681 A

  By the way, when the AV amplifier is in the complete standby state, the power supply voltage is not supplied to the HDMI receiving unit and the HDMI transmitting unit of the AV amplifier, so that the AV amplifier is in the stopped state, and the source device is newly connected to the AV amplifier in the complete standby state. Even if it is done, this cannot be recognized. If the newly connected source device cannot be recognized, the physical address of the newly connected source device will not be updated correctly in the system, so even if the source device is played back and <Active Source>, which is a CEC message, is sent from this source device. Even when broadcasting, the AV amplifier and the display cannot correctly switch the input to the source device because they do not have the correct physical address.

  It is an object of the present invention to transmit this new content even when a content transmission device is newly connected when content data receiving means such as an HDMI receiving unit and content data transmitting means such as an HDMI transmitting unit are in a stopped state. It is an object of the present invention to provide a content transmission / reception device that can correctly recognize the physical address of the device.

The content transmitting / receiving apparatus of the present invention includes an input terminal to which a content transmitting apparatus is connected, an output terminal to which a content receiving apparatus is connected, a receiving means for receiving content data transmitted from the content transmitting apparatus, and the content data Transmitting means to the content receiving device, and in a first standby state in which no power supply voltage is supplied to the receiving means and the transmitting means, when a new content transmitting device is connected to the input terminal , Detecting the presence of a new content transmission device using a predetermined device control signal, shifting to a second standby state in which a power supply voltage is supplied to the reception unit and the transmission unit, and the physical content of the new content transmission device a control unit to obtain the address, the input terminals are HDMI input terminal, the output terminal H An MI output terminal, the content transmission device is connected to the input terminal via an HDMI cable, the content reception device is connected to the output terminal via an HDMI cable, and the control means is used as the device control signal Using the CEC message, the presence of a new content transmission device is detected when the CEC message from the connected content transmission device is not a message from a device having an existing logical address .

  In the present invention, even when the power supply voltage is not supplied to the reception unit and the transmission unit in the first standby state and the operation is stopped, the control unit uses the predetermined device control signal to control the new content transmission apparatus. The presence of a new content transmission device is detected by transmitting and receiving data. At this time, the receiving unit and the transmitting unit are still in an operation stop state, so that the physical address of the new content transmitting apparatus is unknown. When the control unit detects the presence of a new content transmission device, the control unit supplies a power supply voltage to the reception unit and the transmission unit and shifts them to an operation state, thereby acquiring a physical address of the new content transmission device.

  In one embodiment of the present invention, when the control means detects the presence of a new content transmission device using the device control signal, the control means assigns a new content transmission device to a new logical address, and sets the new logical address to the new logical address. A physical address is inquired with respect to the inquiry, and a physical address returned from the new content transmitting apparatus in response to the inquiry is acquired.

  In another embodiment of the present invention, a storage unit that stores a table associating a logical address and a physical address of the content transmission device is provided, and the control unit associates the acquired physical address with the new logical address. The table is updated.

  In another embodiment of the present invention, when the control means detects the presence of a new content transmission apparatus using a CEC message, the control means transmits an HPD (hot plug detect) signal of an HPD line included in the HDMI cable. It is characterized by changing from the level to the Hi level.

  According to the present invention, even when the content data receiving means such as the HDMI receiving unit and the content data transmitting means such as the HDMI transmitting unit are in the operation stop state, this new content can be obtained even when the content transmitting device is newly connected. The physical address of the transmitting device can be recognized correctly. Therefore, even if content data is transmitted from a new content transmission device, the input destination can be correctly switched using the physical address.

It is a system configuration figure of an embodiment. It is a physical address explanatory diagram of the embodiment. It is a processing flowchart of an embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Throughout this specification, CEC (Consumer Electronics Control) means a control protocol for performing control between AV devices in the HDMI standard.

  FIG. 1 shows a system configuration diagram of the present embodiment. A DVD player as a source device and a content transmission device, an AV amplifier 10 as a repeater device and a content transmission / reception device, and a display 60 as a sink device and a content reception device are connected in a tree shape and a hierarchy. The source device means a device having an HDMI output terminal, the repeater device means a device having an HDMI input terminal and an HDMI output terminal, and the sink device means a device having an HDMI input terminal.

  The AV amplifier 10 which is a repeater device and a content transmitting / receiving device includes a plurality of input terminals 12 and 14, an operation unit 16, an HDMI receiving unit 18, a control unit 20, a memory 22, an output terminal 24, A display unit 26, an HDMI transmission unit 28, an audio processing unit 30, a power supply unit 32, and a bus 34 are provided. The plurality of input terminals 12 and 14 are distinguished as an input terminal (1) and an input terminal (2) in the figure. The output terminal 24 is an output terminal (1) in the figure. There may be a plurality of output terminals.

  HDMI data from the source device is received by the HDMI receiving unit 18 via the input terminals 12 and 14 and the bus 34.

  The HDMI receiving unit 18 generates original video data (video data before HDMI conversion) from the video data included in the received HDMI data, and outputs the generated video data to the HDMI transmitting unit 28. Also, the HDMI receiving unit 18 generates original audio data from the audio data included in the received HDMI data and outputs the original audio data to the audio processing unit 30.

  The HDMI transmission unit 28 converts the video data received from the HDMI reception unit 18 into HDMI data and outputs the HDMI data to the output terminal 24.

  The audio processing unit 30 performs predetermined processing such as delay processing, equalizer processing, volume adjustment processing, amplification processing, DA conversion, and the like on the audio data received from the HDMI receiving unit 18 and outputs the result to the external speaker 62.

  When the audio is not reproduced by the AV amplifier 10, the HDMI receiving unit 18 outputs the received HDMI data as it is to the HDMI transmitting unit 28 (so-called through state).

  The control unit 20 controls the operation of each unit of the AV amplifier 10 according to a program stored in the memory 22. The control unit 20 is connected to each control unit of the DVD players 50 and 52 and the display 60 via the CEC line of the HDMI cable, and transmits / receives CEC messages to / from each control unit.

  When an instruction to shift the AV amplifier 10 from the power-on state to the standby state is input by the user operating the operation unit 16, the control unit 20 controls the power supply unit 32 that supplies power to each unit of the AV amplifier 10. Transition to the standby state. The standby state includes a complete standby state and other standby states. The complete standby state is a state in which the power supply voltage is supplied only to the control unit 20 and the power supply voltage is not supplied to the HDMI reception unit 18, the HDMI transmission unit 28, and others (the control unit 20 is in an idle state). The other standby state is a state in which the power supply voltage is supplied to the control unit 20, the HDMI reception unit 18, and the HDMI transmission unit 28, and the power supply voltage is not supplied to other parts. The complete standby state is defined as the first standby state, and the other standby states are defined as the second standby state.

  The display unit 26 displays various operating states of the AV amplifier 10.

  The DVD players 50 and 52 of the source device are connected to the input terminals 10 and 12 of the AV amplifier 10 via HDMI cables 70 and 72, respectively. That is, the DVD player 50 is connected to the input terminal 12 via an HDMI 70 cable, and the DVD player 52 is connected to the input terminal 14 via an HDMI cable 72. When the user selects the input selector of the operation unit 16 as the input terminal 12, the HDMI receiving unit 18 receives HDMI data from the DVD player 50 connected to the input terminal 12. When the user selects the input selector of the operation unit 16 as the input terminal 14, the HDMI receiving unit 18 receives HDMI data from the DVD player 52 connected to the input terminal 14.

  The display 60 is a digital television or the like having an HDMI input terminal, and is connected to the output terminal 24 with an HDMI cable 80. It is assumed that the input terminal (1) of the display 60 is connected to the output terminal 24 of the AV amplifier 10.

  HDMI cables 70, 72, and 80 for connecting HDMI devices to each other are a TMDS line for transmitting a video / audio signal as a content signal by a differential method and a bi-directional transmission for transmitting a CEC message as a control signal between the devices. A CEC line as a bus, a DDC line for transmitting EDID (Extended Display Identification Data), and the like, and an HPD (Hot Plug Detect) line are provided.

  In CEC, a logical address and a physical address of each HDMI-connected device are acquired, and a CEC message can be transmitted to a desired device by specifying the physical address. The logical address represents the type of each device, and 16 addresses from “0” to “F” are prepared. The device type of the connected device is assigned to each logical address. The physical address represents the position of each device in the system, and is mainly used for designating an input switching destination. The sink device is the lowest layer (0th layer), and the input number of the device connected to the sink device is described as a number in the first layer. The same applies to the second and subsequent layers.

  FIG. 2 shows physical addresses in the system of FIG. A physical address [0.0.0.0] is assigned to the display 60 which is the sink device at the lowest layer. [1.0.0.0] is assigned to the AV amplifier 10 connected to the display 60. That is, the physical address is obtained by changing the leftmost number of the physical address of the display 60 to the number (1) of the input terminal to which the AV amplifier 10 is connected. Also, the physical address [1.1.0.0] is given to the DVD player 50 connected to the input terminal 12 (input terminal (1)) of the AV amplifier 10, and the input terminal 14 ( The physical address [1.2.0.0] is assigned to the DVD player 52 connected to the input terminal (2)). That is, the physical address is obtained by changing the second number from the left of the physical address of the AV amplifier 10 to the number of the input terminal to which the DVD players 50 and 52 are connected.

  In the above configuration, now only the DVD player 50 is connected to the input terminal 12 of the AV amplifier 10, and the display 60 is connected to the output terminal 24, the AV amplifier 10 is in the complete standby state (first standby state). ) Is assumed.

  In the complete standby state, the power supply voltage from the power supply unit 32 is supplied only to the control unit 20, and the power supply voltage is not supplied to the HDMI reception unit 18, the HDMI transmission unit 28, and other parts, and the operation is stopped. The physical address of each device is stored in the memory of the display 60 and the memory 22 of the AV amplifier 10 in association with the logical address. For example, the memory 22 of the AV amplifier 10 stores its own physical address [1.0.0.0] in association with the logical address “0”, and the DVD player in association with the logical address “1”. 50 physical addresses [1.1.0.0] are stored.

  When the AV amplifier 10 is in a normal operation state, when the DVD player 50 is connected to the input terminal 12 of the AV amplifier 10 and the DVD player 52 is connected to the input terminal 14, the respective DVD players 50, 52 are connected. A physical address is assigned to each, and the input destination can be switched based on the physical address. For example, when the user operates the playback button of the DVD player 50, the DVD player 50 outputs HDMI data and indicates an active device if it can output a stable video signal. Broadcast <Active Source> of the CEC message. The display 60 and the AV amplifier 10 to which <Active Source> has been broadcasted switches the path for reproducing the HDMI data output from the DVD player 50 using the physical address.

  The same applies when the user operates the playback button of the DVD player 52. The DVD player 52 outputs HDMI data and is an active device if it can output a stable video signal. Broadcast <Active Source> of the CEC message indicating that. The display 60 or the AV amplifier 10 that has been broadcasted <Active Source> switches the path for reproducing the HDMI data output from the DVD player 52 using the physical address. That is, if the physical address of the DVD player 52 is [1.2.0.0], the DVD player 52 broadcasts an <Active Source 1.2.0.0> message, and the AV amplifier 10 and the display 60 that have received this message The input destination is switched using the physical address [1.2.0.0]. When switching the input destination, the display 60 broadcasts a <Set Stream Path 1.2.0.0> message.

  On the other hand, when the AV amplifier 10 is in the complete standby state (first standby state), the power receiving power is not supplied to the HDMI receiving unit 18 and the HDMI transmitting unit 28 and the operation is stopped. That is, for example, assume that the AV amplifier 10 has shifted to the complete standby state in a state where the DVD player 50 is connected to the input terminal 12 and the DVD player 52 is not yet connected to the input terminal 14. In this case, although the physical address of the DVD player 50 is specified and stored in the memory 22 of the AV amplifier 10 and the memory of the display 60, the physical address of the DVD player 52 does not exist.

  When the DVD player 52 is connected to the input terminal 14 in this state, since the HDMI receiving unit 18 is in an operation stop state, the HPD also remains at the Lo level, and it cannot be recognized that the DVD player 52 is connected. That physical address also remains unupdated. Therefore, even if the user operates the playback button of the DVD player 52 in this state and the DVD player 52 broadcasts <Active Source>, the correct physical address of the DVD player 52 does not exist, so the input destination is the DVD player. Cannot switch to 52.

  Therefore, in the present embodiment, even when a source device such as the DVD player 52 is connected while the AV amplifier 10 is in a complete standby state, control is performed so that this connection is recognized and its physical address is updated.

  Specifically, even when the AV amplifier 10 is in a complete standby state and the HDMI receiving unit 18 and the HDMI transmitting unit 28 are in the operation stop state, the control unit 20 of the AV amplifier 10 and the control unit of the DVD player 52 are not connected. The control unit 20 of the AV amplifier 10 transmits and receives the CEC message using the CEC line, and the control unit 20 of the AV amplifier 10 transmits and receives the CEC message. When the presence of the DVD player 52 is detected, the power supply voltage from the power supply unit 32 is supplied to the HDMI receiving unit 18 and the HDMI transmitting unit 28 in spite of being in the complete standby state, thereby setting the operation state. The connection of the DVD player 52 is recognized by changing the (detection) from the Lo level to the Hi level. Then, the physical address of the DVD player 52 is acquired and updated by a predetermined communication sequence, and the physical address in the memory 22, more specifically, the table that associates the logical address with the physical address is updated.

  FIG. 3 shows a processing flowchart of the present embodiment. When the user operates the operation unit 16, the AV amplifier 10 shifts to a complete standby state (S101). That is, the power supply voltage is supplied only to the control unit 20, and the power supply voltage is not supplied to the HDMI receiving unit 18, the HDMI transmitting unit 28, and other parts.

  When the AV amplifier 10 shifts to the complete standby state, the control unit 20 periodically monitors whether there is a CEC message (CEC command) interrupt (S102). If there is no interruption of the CEC message, the complete standby state is maintained as it is.

  On the other hand, when some source device is connected to the AV amplifier 10 via the HDMI cable, for example, when the DVD player 52 is connected to the input terminal 14 via the HDMI cable 72, the control unit of the source device and the AV amplifier 10 are connected. Since the control unit 20 is connected by a CEC line of a bidirectional bus, even if the power supply voltage is not supplied to the HDMI receiving unit 18 and the HDMI transmitting unit 28, the control unit of the source device and the AV amplifier 10 It is possible to transmit / receive a CEC message to / from the control unit 20, and when a CEC message is transmitted from the control unit of the source device, the CEC message is received. When the control unit 20 determines that there is an interruption of the CEC message, the control unit 20 refers to the logical address table stored in the memory 22 to determine whether the source device is a source device having a logical address that already exists or a new logical address. Determine if it is the source device. For example, if the DVD player 50 has already been connected to the HDMI cable 70 before the transition to the complete standby state, the DVD player 50 has already been assigned to the specific address of the logical address, and an interrupt CEC message is received from the DVD player 50. Message is determined not to be a new logical address. If the interrupt CEC message is a message from the DVD player 52, it is determined as a new logical address. If the interrupt message is a message from a source device having a logical address that already exists, it is not necessary to update the physical address, so the complete standby state is maintained as it is.

  When the interrupt message is a message from the source device having the new logical address, the control unit 20 considers that the new source device is connected, and shifts to the second standby state. That is, the power supply voltage from the power supply unit 32 is supplied to the HDMI reception unit 18 and the HDMI transmission unit 28 to shift them to the operation state. In other words, the AV amplifier 10 is shifted from the first standby state to the second standby state. Also, HPD (hot plug detection) is changed from Lo level to Hi level (S104). Specifically, a voltage higher than a predetermined voltage, for example, +5 V is output to the HPD line. HPD (Hot Plug Detection) is a communication mechanism that connects a source device and a sink device. The source device determines that the source device is connected to the sink device by this HPD signal, and is a signal that matches the capability of the sink device. Set. By changing the HPD signal from the Lo level to the Hi level, a communication sequence at the time of activation is started between the source device and the sink device. Accordingly, a communication sequence is started between the control unit of the DVD player 52 and the control unit 20, and connection confirmation using the logical address table is executed. In this embodiment, it should be noted that when there is no new logical address, the HPD signal remains at Lo level and does not change to Hi level. In this sense, it can be said that there is a CEC message interrupt and the HPD signal is changed from the Lo level to the Hi level by using the interrupt as a trigger from the new sheath device. At the same time, the DVD player 52 can access the EDID of the display 60 and the AV amplifier 10 to set the format and resolution. Although transmission of EDID is performed using a DDC line, it is possible because the HDMI receiving unit 18 and the HDMI transmitting unit 28 are in an operating state.

In this connection confirmation, the control unit 20 confirms the physical address from the newly connected source device (S105). That is, the control unit 20 performs polling on the connected devices using the <Give Physical Address> message when confirming the connection of each logical address based on the logical address table. If the source device is connected to the logical address that has been polled, the source device returns <Report Physical Address> as a response to the polling, and returns its own physical address. The control unit 20 transmits a <Give Physical Address> message not only to the logical address of the DVD player 50 but also to the logical address of the DVD player 52, and confirms the <Report Physical Address> from the DVD player 52. The physical address of the DVD player 52 is acquired, and the table that associates the logical address with the physical address is updated. For example, a table that associates the logical address before update and the physical address stored in the memory 22 is as follows:
Logical address Physical address Device type Device name 1 [1.1.0.0] Playback DVD player A
2 (None) (None) (None)
Then, by changing the HPD signal from Lo level to Hi level and updating the correspondence table,
Logical address Physical address Device type Device name 1 [1.1.0.0] Playback DVD player A
2 [1.2.0.0] Playback DVD Player B
It becomes. The physical address [1.2.0.0] of the logical address “2” is an address acquired by <Report Physical Address> returned in response to the <Give Physical Address> message.

  In this embodiment, the <Give Physical Address> message is also transmitted to the logical address of the DVD player 50 when the connection is confirmed. However, when a transition is made from the complete standby state, only the new logical address is < You may obtain only the physical address of the device by sending Give Physical Address>.

  Finally, the control unit 20 refers to the logical address / physical address correspondence table updated and stored in the memory 22, and determines whether or not the new logical address has acquired a new physical address (S106). . In the above example, the new logical address is “2”, and it is determined that this has acquired a new physical address. If all new logical addresses have not acquired a new physical address, the process from S104 is repeated to update the table. If it is determined that all the new logical addresses have acquired a new physical address, the control unit 20 stops supplying the power supply voltage to the HDMI receiving unit 18 and the HDMI transmitting unit 28 and shifts to the complete standby state again. In other words, the control unit 20 temporarily shifts from the first standby state to the second standby state, updates the physical address, and then shifts to the first standby state again.

  As described above, in this embodiment, when a new source device is connected when the AV amplifier 10 is in the complete standby state, the control unit 20 detects a new source device by a CEC message via the CEC line. Then, the power supply voltage is supplied to the HDMI receiving unit 18 and the HDMI transmitting unit 28 to set the operation state, and the HPD signal is changed from the Lo level to the Hi level to acquire and update the physical address of the new source device. Even if a source device is played back, the input can be immediately switched correspondingly. That is, even when the DVD player 52 is newly connected to the input terminal 14 while the AV amplifier 10 is in the complete standby state, the control unit 20 acquires the physical address [1.2.0.0] of the DVD player 52 by the above sequence. Since the table is updated, even if the playback of the DVD player 52 is started and <Active Source> is broadcast, the input can be correctly switched to the path of the DVD player 52 correspondingly.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to this, A various deformation | transformation is possible.

  For example, although a DVD player is exemplified as the source device in the present embodiment, a BD player or other player, a recorder, or a game machine may be used.

  In this embodiment, the source device / content transmitting device, the repeater device / content transmitting / receiving device, and the sink device / content receiving device are connected by the HDMI cables 70, 72, 80. It is not necessary to be connected, and it may be connected by other communication standards, and the connection form is not limited to wired and may be wireless. However, the present invention controls each device even when the power supply voltage is not supplied to the receiving means for receiving the content data from the content transmitting means and the transmitting means for transmitting the content data to the content receiving means and the operation is stopped. Because it is assumed that control signals can be transmitted and received between the units, each device must be connected via a bidirectional line (whether wired or wireless), and the standard must be able to transmit and receive device control signals to each other. is necessary. An example is a CEC line and a CEC message in the HDMI standard, but the present invention is not necessarily limited to this, and a device control signal can be transmitted and received, and at least a new content transmission device exists using the device control signal. Can be detected.

  In the present embodiment, the first standby state, which is the complete standby state, is temporarily shifted to the second standby state, and after the physical address is updated, the transition is again made to the first standby state, which is the complete standby state. The second standby state may be maintained after the physical address is updated.

  In the present embodiment, the control unit 20 shifts to the complete standby state when the user gives an instruction to shift to the complete standby state. At this time, a <Give Device Power Status> message is displayed on the display 60. It may be transmitted to make an inquiry about the power supply state, and after confirming that the display 60 is in the standby state, it may shift to the complete standby state.

  Furthermore, in this embodiment, as shown in FIG. 1, the HDMI receiving unit 18 and the HDMI transmitting unit 28 are shown as separate members, but these may be configured by a single component. 1 is shown as a single member in FIG. 1, but it may be composed of a plurality of control units. Specifically, the control unit 20 includes a main microcomputer and a front microcomputer. The main microcomputer controls the operations of the HDMI receiving unit 18, the HDMI transmitting unit 28, and the power supply 32, and the front microcomputer transmits and receives CEC messages on the CEC line. Etc. In the full standby state, both the main microcomputer and the front microcomputer are in operation with the power supply voltage supplied. When the front microcomputer receives a CEC message from a new content transmitter, the main microcomputer instructs the main microcomputer. The power supply voltage is supplied to the HDMI receiving unit 18 and the HDMI transmitting unit 28 in response to the command from the receiver, and the HPD signal is changed from the Lo level to the Hi level.

  10 AV amplifier, 12 input terminal (1), 14 input terminal (2), 16 operation unit, 18 HDMI reception unit, 20 control unit, 22 memory, 24 output terminal (1), 26 display unit, 28 HDMI transmission unit, 30 audio processing unit, 32 power supply unit, 50 DVD player (A), 52 DVD player (B), 60 display, 62 speaker.

Claims (4)

An input terminal to which the content transmission device is connected;
An output terminal to which the content receiving device is connected;
Receiving means for receiving content data transmitted from the content transmitting device;
Transmitting means for transmitting the content data to the content receiving device;
When a new content transmission device is connected to the input terminal in a first standby state in which a power supply voltage is not supplied to the reception unit and the transmission unit, new content is transmitted using a predetermined device control signal. Control means for detecting the presence of the transmission device, shifting to a second standby state for supplying a power supply voltage to the reception means and the transmission means, and acquiring a physical address of the new content transmission device;
With
The input terminal is an HDMI input terminal,
The output terminal is an HDMI output terminal,
The content transmission device is connected to the input terminal via an HDMI cable,
The content receiving device is connected to the output terminal via an HDMI cable,
The control means uses a CEC message as the device control signal to detect the presence of a new content transmission device when the CEC message from the connected content transmission device is not a message from a device having an existing logical address. A content transmitting / receiving apparatus characterized by: The content transmitting / receiving apparatus according to claim 1.
When the control means detects the presence of a new content transmission device using the device control signal, the control means allocates a new content transmission device to a new logical address, inquires a physical address for the new logical address, and makes an inquiry. A content transmitting / receiving apparatus, wherein a physical address returned from a new content transmitting apparatus is acquired. The content transmitting / receiving apparatus according to claim 2.
A storage means for storing a table associating a logical address and a physical address of the content transmitting device, wherein the control means updates the table by associating the acquired physical address with a new logical address. Transmitter / receiver. The content transmitting / receiving apparatus according to claim 1 .
When the control means detects the presence of a new content transmission device using a CEC message, the control means changes the HPD (Hot Plug Detect) signal of the HPD line included in the HDMI cable from the Lo level to the Hi level. Content transmitting and receiving device.

Images