JP5698945B2 - Display device and signal processing method - Google Patents

Description

  The technical field relates to control of communication performed between a plurality of devices.

  As an interface standard for transmitting and receiving a video / audio signal between a plurality of devices, there is a High-Definition Multimedia Interface (registered trademark) standard. In the HDMI standard, CEC (Consumer Electronics Control) is defined as a device control signal / control protocol.

  Regarding this CEC, Patent Document 1 states that “Efforts focusing on cooperative operation using CEC of home devices in each company are accelerating, and there are a variety of devices corresponding to CEC. The number of devices with unstable CEC operation can be expected to increase, and the chance that CEC communication will be interrupted is expected to increase. Every time CEC is disconnected, all devices must be reconnected to the HDMI cable. ” As a means for solving the problem, “a CEC communication apparatus that performs communication control by CEC that is inter-device communication control defined by the HDMI standard, and that controls the CEC communication apparatus” A control unit, a CEC transmission / reception unit that transmits / receives a CEC command, a reset order determination unit that determines the order of devices to be reset, and a C that monitors a CEC communication line A C communication line monitoring unit, and a CEC reset unit for requesting transmission of a reset command to a CEC communication device of another CEC compatible device via an HDMI connection line other than CEC. Is detected, the CEC reset unit sends a reset command to the CEC communication device of another CEC compatible device via the HDMI connection line other than CEC in the order determined by the reset order determination unit, and recovers from the CEC communication interruption state. (See Patent Document 1 [0009]) and the like.

JP2010-15403

  When three or more devices are connected via an interface such as HDMI, the processing is more complicated than when two devices are connected, and in some cases there is a risk that control of the connected devices may be inadequate. However, there is a problem that the usability becomes worse.

  For example, when a plurality of playback devices (Sources) are connected to one display device (Sink), Active Source (a device in which a signal to be output is valid in the CEC network. In the CEC standard, Active Source is one CEC line. If one is defined above), the processing of the playback device (for example, DVD playback processing) may stop even though the user does not intend.

  Further, for example, in a system including three or more devices connected by HDMI, when the CEC output terminal of any device is fixed at the Low level, the CEC communication control line of the entire CEC network is set to the Low level due to the influence. There is a problem that the entire CEC network cannot be controlled. Patent Document 1 discloses a technical idea of recovering CEC communication by resetting a CEC network. However, the connected device is a device in which the CEC output terminal is always fixed at a low level in a predetermined state. In this case, the CEC communication cannot be recovered by resetting the CEC network.

  In addition, for example, since the number of logical addresses used for CEC communication control is limited, when devices exceeding the limit number are connected, it is impossible to control the devices exceeding the limit number.

  In order to solve the above problems, for example, the configuration described in the claims is adopted.

  According to the above means, even when three or more devices are connected by an interface such as HDMI, it is possible to reduce control deficiencies of the connected devices and improve user convenience. Is possible.

It is a block diagram which shows an example of a display system. It is a block diagram which shows an example of the conventional CEC network. It is a block diagram which shows the CEC network in a present Example. It is a block diagram of the information processing apparatus in a present Example. It is a figure which shows transmission / reception of the CEC message in a present Example. It is a figure which shows transmission / reception of another CEC message in a present Example. It is a 1st flowchart of the CEC communication control process in a present Example. It is a 2nd flowchart of the CEC communication control process in a present Example. It is a 3rd flowchart of the CEC communication control process in a present Example.

  In recent years, operation of one device from another device using serial communication has increased. As an example, in the HDMI standard, CEC that mutually controls information processing apparatuses such as a television receiver (TV), a DVD player, and a DVD / HDD recorder is defined as an addendum. CEC is single-line bidirectional asynchronous serial communication.

  Furthermore, the television is equipped with a plurality of HDMI input connectors, and simultaneously displays a broadcast received by the television and a video signal input from another information processing device, or a video signal input from another information processing device and another video signal. Processing for simultaneously displaying the video signals input from the information processing apparatus is performed.

  The CEC standard has a concept of Active Source, which indicates that the signal output from the information processing apparatus is valid. In the CEC standard, the Active Source is defined as one on one CEC line. .

  In addition, since the CEC line is basically directly connected to all devices on the CEC network, a failure of one device affects the entire network. For example, when the CEC output terminal is fixed at the Low level due to a software defect of one device, the communication line of the entire network is fixed at the Low level due to the influence, and the entire CEC network becomes unable to communicate.

  Next, a system composed of conventional information processing apparatuses will be described with reference to the drawings while paying attention to Active Source. FIG. 1 is a block diagram showing an example of a conventional display system. FIG. 1 shows an example in which the main information processing apparatus is the display apparatus 100. It is assumed that the display device 100 displays the video output from the playback device 101 and the video output from the playback device 101 at the same time. Each playback device supports CEC, and is connected by an HDMI cable indicated by a thick arrow in the drawing, and each supplies a video signal and an audio signal to the display device 100.

  Between CEC-compatible information processing apparatuses, the remote controller 103 of the display apparatus 100 can operate the playback apparatus 101 and the playback apparatus 102 using CEC communication control, and the display apparatus 100 outputs a video signal output from the playback apparatus 101, When an audio signal is selected, the playback apparatus 101 is in the Active Source state because the CEC standard defines that the playback apparatus 101 is an Active Source.

  Here, when the playback device 101 is playing back a DVD or the like, when the display device 100 selects a video signal or an audio signal output from the playback device 102, the number of devices that are active sources in the CEC standard is determined. Therefore, the playback apparatus 102 becomes Active Source, and the playback apparatus 101 loses the Active Source state and may stop DVD playback.

  The above is an example in which the display device 100 displays the video output from the playback device 101 and the video output from the playback device 102 on two screens. This is received by the display device 100 when receiving a television broadcast. The same applies to the case where a two-screen display is performed using a television broadcast and a video signal input from another information processing apparatus such as the playback apparatus 101 or the playback apparatus 102. The display apparatus 100 is not limited to the two-screen display mode. The same applies when displaying images of a plurality of routes simultaneously.

  FIG. 2 is a block diagram showing an example of a conventional CEC network when a plurality of CEC-compatible devices are connected. As shown in Fig. 2, when the CEC line is directly connected to all devices on the network, a sink device having a HDMI signal reception function, a repeater device having a HDMI signal transmission / reception function, and a source having an HDMI signal transmission function When the CEC output terminal is fixed at a low level for any reason, the CEC communication control line of the entire CEC network is fixed at the low level due to the influence, and the entire CEC network may not be able to control the CEC communication. is there.

  In addition, in order to perform CEC communication control, it is necessary to acquire a logical address. The logical address is a value indicating the type of CEC-compatible device. For example, there are three logical addresses indicating Recording Device, four logical addresses indicating Tuner, three logical addresses indicating Playback Device, and a logical address indicating Audio System. One address or the like is prepared, and the information processing apparatus can control the CEC communication by acquiring one logical address.

  At this time, for example, when four CEC-compatible DVD / HDD recorders are connected to the CEC network, the four DVD / HDD recorders attempt to obtain a logical address indicating the Recording Device, but the logical address indicating the Recording Device is 3 Since there is only one, a single DVD / HDD recorder cannot acquire a logical address and CEC communication control is impossible. Similarly, when two CEC-compatible audio amplifiers are connected on the CEC network, the two audio amplifiers attempt to obtain a logical address indicating the audio system, but there is only one logical address indicating the audio system. One audio amplifier may not be able to acquire a logical address and may not be able to control CEC communication.

  In the following embodiments, in any situation where the information processing apparatus selects any video signal / audio signal path, the playback apparatus does not stop playback of a DVD or the like, and there is a problem with one information processing apparatus. Even in such a case, an information processing apparatus that does not adversely affect the entire CEC network and maintains compatibility with a conventional information processing apparatus, and CEC communication control processing of the information processing apparatus will be described.

  An example of device control using HDMI will be described with reference to the drawings.

  FIG. 3 is a block diagram showing a CEC network when a plurality of CEC-compatible devices in this embodiment are connected. In this embodiment, the CEC line is separated for each HDMI input of each information processing apparatus. For an information processing apparatus (Repeater) having a function of transmitting / receiving an HDMI signal, a CEC line is separated between HDMI inputs and outputs.

  As a result, it is possible to control the active source for each separated CEC network so that the source device does not inadvertently stop playback of a DVD or the like, and any one of the information processing devices has a CEC output terminal for some reason. Even when is fixed at the Low level, it is possible to prevent the CEC network from being unable to control CEC communication.

  FIG. 4 is a block diagram of the information processing apparatus in the present embodiment. The overall operation will be described with reference to FIG. 4 taking the case where the information processing apparatus is the display apparatus 40 as an example.

  A television broadcast radio wave signal received by a broadcast receiving antenna (not shown) is supplied to a broadcast reception processing unit 410, and a broadcast signal of a channel desired by a user is extracted and converted into a predetermined frequency band and converted to a predetermined frequency band. Then, the signal is demodulated to cancel the modulation processing applied for transmission. In the case of digital broadcasting, a plurality of contents are often time-division multiplexed on one broadcast channel, but the broadcast reception processing unit 410 further performs predetermined processing such as a demultiplexer process for selecting one content desired by the user. I do. The output signal of the broadcast reception processing unit 410 is supplied to the video / audio processing unit 413.

  Next, transmission / reception of signals with an external device will be described. The display device 40 has a plurality (N) of HDMI connectors 1 to N (401 to 40N), and each connector is an HDMI of the external devices 1 to N (41 to 4N) that are information processing devices. It is connected to a connector (not shown) via an HDMI cable. As described above, the external devices 1 to N may be a recording device such as a DVD / HDD recorder, a playback device such as a DVD player, or an audio system that drives a speaker. .

  Of course, these may be mixed, or any HDMI connector may not be connected to an external device. As shown in FIG. 3, another external device may be connected via any one of the external devices. The display device 40 may have a plurality of HDMI connectors, for example, two as shown in FIG.

  When a user views video content supplied from an external device such as a recording device or a playback device, first, which external device the user wants to receive video and audio signals is determined by, for example, FIG. The remote controller 103 as shown in FIG. The control unit 414 controls the HDMI receiving unit 411 to supply the video / audio processing unit 413 with video and audio signals supplied from an external device desired by the user.

  The control unit 414 supplies a video signal desired by the user from the video / audio processing unit 413 to the display unit 415 based on an instruction from the remote controller of the user, for example, and displays the video as described above.

  As described above, the control unit 414 supplies an audio signal desired by the user from the video / audio processing unit 413 to the speaker 416 based on an instruction from the remote controller of the user, for example, and generates audio.

  The video and audio signals supplied from the external device to the HDMI receiving unit 411 and supplied from the HDMI receiving unit 411 to the video / audio processing unit 413 are indicated by one arrow in the drawing, but are supplied from a plurality of external devices. Multiple video and audio signals may be transmitted simultaneously. That is, the display unit 415 may simultaneously display a plurality of videos supplied from a plurality of external devices.

  The display unit 415 may simultaneously display a television broadcast received by the display device 40 and processed by the broadcast reception processing unit 410 and a video supplied from an external device.

  The CEC control unit 412 is separately connected to each of the HDMI connectors 1 to N (401 to 40N), and is connected to the external devices 1 to N (41 to 4N) via the HDMI connectors 1 to N (401 to 40N). Then, bi-directional control is performed for external devices based on the CEC standard. At this time, the CEC control unit 412 performs control to transfer the CEC message to each separated CEC network based on predetermined matters.

  The control unit 414, the CEC control unit 412 and the HDMI receiving unit 411 are shown as separate blocks, but are not limited thereto. For example, the same block may be incorporated in the same semiconductor chip on the semiconductor device.

  Next, an embodiment in which the CEC control unit 412 transfers a CEC message to each separated CEC network based on predetermined items will be described using a specific CEC message as an example with reference to FIGS. 5 and 6.

  FIG. 5 is a diagram illustrating transmission and reception of CEC messages in the present embodiment. The display device 52 has a physical address [0000] indicating the position of the CEC-compatible device connected to the CEC network. The external device 51 has a physical address of [1000], indicating that it is connected to the HDMI input 1 of the display device 52.

  The external device 53 has a physical address of [2000] and is connected to the HDMI input 2 of the display device 52. Here, the display device 52 and the external device 51 constitute one CEC network, and the display device 52 and the external device 53 constitute one CEC network.

  For example, when the external device 51 issues a CEC message indicating the manufacturer ID of the external device 51 <Device Vendor ID> as shown in the figure, the <Device Vendor ID> message is connected to a CEC network called a Broadcast message in the CEC standard. The display device 52 transfers the CEC message to the external device 53 because it is defined as a CEC message issued to all CEC-compatible devices.

  Also, for example, as shown in the figure, when the external device 51 issues a CEC message indicating that the external device 51 is <Active Source> as an Active Source, the <Active Source> message is a broadcast message in the same manner as the CEC message. Although defined, the display device 52 does not transfer a CEC message whose Active Source may change to the external device 53.

  Also, for example, when the external device 53 issues an <Active Source> message as shown in the figure, the display device 52 does not transfer a CEC message that may change the Active Source to the external device 51.

  By this processing, the display device 52 can manage the Active Source for each separated CEC network. FIG. 6 is a diagram illustrating transmission / reception of another CEC message in the present embodiment. The display device 62 has a physical address [0000]. The external device 61 has a physical address of [1000], indicating that it is connected to the HDMI input 1 of the display device 62. The audio system 63 has a physical address of [2000] and is connected to the HDMI input 2 of the display device 62. Also, the external device 64 has a physical address [2100], indicating that it is connected to the HDMI input 1 of the audio system 63.

  Here, the display device 62 and the external device 61 constitute one CEC network, and the display device 62, the audio system 63, and the external device 64 constitute one CEC network. If the audio system 63 also has the CEC network configuration according to this embodiment, the display device 62 and the audio system 63 constitute one CEC network, and the audio system 63 and the external device 64 constitute one CEC network. However, in this figure, the display device 62, the audio system 63, and the external device 64 constitute one CEC network.

  Next, when the audio system 63 silences the speaker of the display device 62 and generates sound from the speaker of the audio system 63 using the CEC communication control, the sound generated by the audio system 63 is displayed by the Active Source. A case where it is necessary to switch between an audio signal input from the device 62 and an audio signal input from the HDMI input of the audio system 63 will be described as an example.

  For example, when the external device 64 issues a <Device Vendor ID> message as shown in the figure, since the CEC message is a broadcast message, the audio system 63 and the display device 62 receive it, and the display device 62 receives the CEC message from the external device. Forward to 61.

  Further, for example, when an external device 61 existing in a CEC network different from the audio system 63 issues an <Active Source> message as shown in the figure, the audio system 63 is made to select an audio signal input from the display device 62. For this reason, the display device 62 transfers the CEC message to the audio system 63 and the external device 64 even if the CEC message may change the Active Source.

  When the display device 62 transfers the <Active Source> message to the audio system 63 or the external device 64, the external device 64 is not in the Active Source state, and playback is stopped when a DVD or the like is being played back. However, the audio system 63 can be switched to a mode in which an audio signal input from the display device 62 is output.

  In this way, the display device 62 determines whether or not an audio system exists in a transfer destination CEC network to which a CEC message whose Active Source may change is determined, and determines that the display device 62 is a CEC network including the audio system. In this case, even if the CEC message may change the Active Source, the audio signal selected by the audio system can be changed by transferring the message.

  For example, when the external device 64 issues an <Active Source> message as shown in the figure, the audio system 63 and the display device 62 receive the CEC message because it is a broadcast message. When the <Active Source> message from the external device 64 is transferred to the external device 61, the external device 61 may lose the Active Source state, so the display device 62 does not transfer the CEC message to the external device 61.

  In this way, the display device 62 determines whether or not an audio system exists in the CEC network that has issued a CEC message in which the Active Source may change, and the <Active source> received from the CEC network in which the audio system exists. When a message is transferred, there is a possibility that the destination device may lose the state of the active source. Therefore, the CEC message from which the active source from the CEC network where the audio system exists may change is not transferred to the other device. .

  Next, a method for the information processing apparatus to transfer a predetermined CEC message to another CEC network will be described with reference to FIGS. As an example, a case where the device that transfers a predetermined CEC message to another CEC network is the display device 40 will be described as an example. Of course, other information processing apparatuses can perform the same operation and are within the scope of the present invention.

  FIG. 7 is a first flowchart of the CEC communication control process in this embodiment. In step S <b> 701, the CEC control unit 412 of the display device 40 determines whether the destination of the detected CEC message exists in the external devices 1 to N (41 to 4N) connected to the display device 40.

  As a result of the determination in step S701, when it is determined that any of the external devices 1 to N (41 to 4N) is the destination (Y in the figure), the CEC control unit 412 determines that the CEC message is the CEC message in step S702. In response to this, an ACK indicating that the CEC message has been received is returned, the CEC message is transferred to the destination external device, and the flow is terminated.

  As a result of the determination in step S701, when it is determined that the CEC message does not exist in the external devices 1 to N (41 to 4N) (N in the figure), the CEC control unit 412 determines that the specific information processing apparatus in step S703. Determine whether the message is a broadcast message that is not addressed.

  As a result of the determination in step S703, when it is determined that the CEC message is not a broadcast message not addressed to a specific information processing apparatus (N in the figure), the CEC message addressed to the display apparatus 40 or the external devices 1 to N ( 41 to 4N), a CEC message addressed to a device that does not exist, and since there is no information processing device to transfer, the flow ends.

  If it is determined in step S703 that the CEC message is a broadcast message not addressed to a specific information processing apparatus (Y in the figure), the CEC control unit 412 displays the CEC message in step S704. It is determined whether it is a CEC message to be transferred to another CEC network formed by the device 40. As described above, the determination as to whether the message is a target CEC message to be transferred to another CEC network is made based on whether the message may change the Active Source. The display device 40 determines not to transfer a Broadcast message whose Active Source may change, and determines to transfer other Broadcast messages.

  As a result of the determination in step S704, when it is determined that the CEC message is not a target CEC message to be transferred to another CEC network configured by the display device 40 (N in the figure), the CEC message is not transferred. So end the flow.

  As a result of the determination in step S704, if it is determined that the CEC message is a CEC message to be transferred to another CEC network configured by the display device 40 (Y in the figure), the CEC control unit in step S705 Reference numeral 412 denotes a broadcast message that is not addressed to a specific information processing apparatus, and is transferred to all CEC networks formed by the display apparatus 40, and the flow ends.

  With this process, it is possible to manage different Active Sources for each separated CEC network.

  Next, an example of an operation flow slightly different from FIG. 7 will be described.

  FIG. 8 is a second flowchart of the CEC communication control process in this embodiment. FIG. 8 shows a method in which the information processing apparatus transfers a predetermined CEC message to another CEC network, as in FIG. 7, but the speaker of the display apparatus is muted by using CEC communication control. This shows a case in which a mode for generating sound is set. For this reason, the difference is that step S801 and step S802 are added depending on the determination result of step S704.

  In FIG. 7, if it is determined as a result of the determination in step S <b> 704 that the display device 40 is not a CEC message to be transferred to another CEC network (N in the figure), the flow is ended as it is. However, in FIG. 8, in step S801, the CEC control unit 412 specially displays the audio when the display device 40 is in a mode in which the speaker of the display device is muted using the CEC communication control to generate sound from the speaker of the audio system. It is determined whether the CEC message is a special transfer target to be transferred to another CEC network to be configured.

  As described above, whether a CEC message is a target CEC message to be transferred to another CEC network is determined by whether or not an audio system exists in the CEC network that has issued a CEC message whose Active Source may change. If it is a CEC message necessary for discrimination and switching between video and audio signals input to the audio system, even an <Active Source> message is subject to special transfer.

  As a result of the determination in step S801, if it is determined that the CEC message is not the special transfer target (N in the figure), the flow is ended as it is.

  As a result of the determination in step S801, when it is determined that the CEC message is the special transfer target (N in the figure), in step S802, the CEC control unit 412 uses the CEC communication control to display the current audio mode. It is determined whether the mode is to mute the speaker and generate sound from the speaker of the audio system.

  As a result of the determination in step S802, if it is determined that the current audio mode is not a mode in which the speaker of the display device is muted using CEC communication control and audio is generated from the speaker of the audio system (N in the figure), the flow is continued. Exit.

  As a result of the determination in step S802, if it is determined that the current audio mode is a mode in which the speaker of the display device is muted using CEC communication control and audio is generated from the speaker of the audio system (Y in the figure), step In step S <b> 705, the CEC control unit 412 transfers the CEC message to all CEC networks configured by the display device 40 using a broadcast message that is not addressed to a specific information processing apparatus, and ends the flow.

  By this processing, the audio system can receive the <Active Source> message necessary for switching the audio input, and can select the audio of the external device connected to another CEC network (audio output from the display device). .

  Next, an example of an operation flow slightly different from FIG. 8 will be described.

  FIG. 9 is a third flowchart of the CEC communication control process in this embodiment. As in FIG. 8, FIG. 9 shows a case where the information processing apparatus transmits a predetermined CEC message to another CEC network when the speaker of the display apparatus is muted and the sound is generated from the speaker of the audio system using CEC communication control. However, the difference is that step S901 is added depending on the result of the determination in step S802.

  In FIG. 8, when it is determined as a result of the determination in step S802 that the current audio mode is a mode in which the speaker of the display device is muted using CEC communication control and audio is generated from the speaker of the audio system (FIG. 8). In step S705, the CEC control unit 412 transfers the CEC message to all CEC networks configured by the display device 40 as a broadcast message not directed to a specific information processing apparatus. In step S901, the CEC control unit 412 determines whether the CEC message is from a CEC network to which the audio system is connected.

  As a result of the determination in step S901, if it is determined that the CEC message is from the CEC network to which the audio system is connected (Y in the figure), the flow is ended as it is.

  As a result of the determination in step S901, if it is determined that the CEC message is not from the CEC network to which the audio system is connected (N in the figure), the CEC control unit 412 identifies the CEC message as a specific information process in step S705. The broadcast message that is not addressed to the device is transferred to all CEC networks configured by the display device 40, and the flow ends.

  This process allows the audio system to receive the <Active Source> message required to switch the audio input, and to select the audio of an external device connected to another CEC network (audio output from the display device). In addition to the above, the loss of the active source can be minimized by receiving a CEC message in which an external device connected to another CEC network may lose the active source.

  Next, a method for performing CEC communication control simultaneously with an external information processing apparatus exceeding the number of logical addresses defined by the CEC standard, independent of another CEC network, will be described with reference to FIG. Hereinafter, as an example, the case where the information processing apparatus is the display apparatus 52 will be described as an example. Of course, other information processing apparatuses can perform the same operation and are within the scope of the present invention.

  At this time, when both the external device 51 and the external device 53 try to acquire the logical address Audio System, both the external device 51 and the external device 53 can acquire the logical address Audio System, and the display device 52 is externally connected. CEC communication control can be performed for the device 51 and the external device 53 simultaneously or by selecting them.

  When transferring a CEC message between independent CEC networks, one information processing device is selected from a plurality of external information processing devices that have acquired similar logical addresses by a unique physical address, and the information processing described above is performed. It is possible to forward the CEC message based on how the device forwards a predetermined CEC message to another CEC network.

  As a method of determining the external information processing apparatus to which the CEC message is transferred, priority may be given, or the user may arbitrarily set it.

  If there are two independent CEC networks as shown in FIG. 5, the display device 52 can control an external information processing device that is about twice the logical address defined by the CEC standard. If there are N networks, the display device 52 can control an external information processing device that is approximately N times the logical address defined by the CEC standard.

  The embodiments described so far are merely examples, and do not limit the present invention. For example, the block diagram of the display device 40 shown in FIG. 4 is an example, and several modifications can be considered. Further, it goes without saying that the information processing apparatus other than the display apparatus has a different block diagram. In addition to the above, different embodiments can be conceived based on the spirit of the present invention, but all fall within the scope of the present invention.

  According to the present embodiment, in any situation where the information processing device selects any video signal or audio signal path, the playback device can display a plurality of screens without stopping playback of a DVD or the like, Even if any information processing apparatus connected to the CEC network has a CEC output terminal fixed at a low level for some reason, the other information processing apparatus does not adversely affect the other information processing apparatus. CEC communication control that is no different from the CEC network is possible. In addition, even when connected to an information processing device exceeding the number of logical addresses defined in the CEC standard, an information processing device capable of performing CEC communication control simultaneously and a CEC communication control processing method for the information processing device can be provided. There is an effect that compatibility with a conventional information processing apparatus can be maintained and user convenience can be improved.

100, 40, 52, 62: Display device, 101, 102: Playback device, 103: Remote control for operation of display device,
41-4N, 51, 53, 61, 64: External equipment,
401 to 40N: HDMI connector, 410: broadcast reception processing unit, 411: HDMI receiving unit, 412: CEC control unit,
413: Video / audio processing unit, 414: Control unit, 415: Display unit, 416: Speaker, 63: Audio system

Claims (6)

A display device to which a plurality of signal sources for outputting video signals and / or audio signals are connected,
A first connector into which a signal from a first signal source is input;
A second connector to which a signal from a second signal source is input;
A video / audio signal processing unit for processing a video signal and an audio signal input to the first connector and the second connector;
A video output unit that outputs the video signal processed by the video and audio signal processing unit;
An audio output unit for outputting an audio signal processed by the video / audio signal processing unit;
A control unit for processing a Broadcast message that is a message addressed to all devices, which is input to the first connector and the second connector,
The control unit does not transfer the broadcast message to the second signal source when the broadcast message input from the first signal source is a broadcast message having a predetermined content. The display device according to claim 1,
The display device according to claim 1, wherein the predetermined broadcast message is a broadcast message for stopping the video signal output of the second signal source. The display device according to claim 1 or 2,
When the device having an audio system is connected to the second signal source even if the broadcast message input from the first signal source is a broadcast message having a predetermined content, the control unit A display device for transferring a Broadcast message to the second signal source. A signal processing method in a display device to which a plurality of signal sources that output video signals and / or audio signals are connected,
Receiving a signal from a first signal source;
Receiving a signal from a second signal source;
Processing video and audio signals input from the first signal source and the second signal source;
Outputting the processed video signal;
Outputting the processed audio signal;
Processing a Broadcast message transmitted from the first signal source and addressed to all devices;
If the first Broadcast message entered from the signal source is a predetermined content of Broadcast messages, the signal processing method characterized in that it does not transfer the Broadcast message to the second signal source. The signal processing method according to claim 4, comprising:
The signal processing method according to claim 1, wherein the predetermined broadcast message is a broadcast message for stopping the video signal output of the second signal source. A signal processing method according to claim 4 or 5, wherein
Even if the broadcast message input from the first signal source is a broadcast message having a predetermined content, if a device having an audio system is connected to the second signal source, the broadcast message is sent to the first message source. 2. A signal processing method, wherein the signal is transferred to a second signal source.

Images