JP2009302893A - Signal input/output device and signal transmission system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase the number of input terminals and to output an HDMI signal transmitted from a source instrument connected to any input terminal, from any output terminal. <P>SOLUTION: An HDMI repeater 1 comprises: a first crosspoint switch 3 which has first to fourth input terminals I<SB>11</SB>, I<SB>12</SB>, I<SB>13</SB>, I<SB>14</SB>, and first and second output terminals O<SB>11</SB>, O<SB>12</SB>, and outputs the HDMI signal input from any input terminal, from any output terminal; and a second cross point switch 4 which comprises first to fourth input terminals I<SB>21</SB>, I<SB>22</SB>, I<SB>23</SB>, I<SB>24</SB>, and first and second output terminals O<SB>21</SB>, O<SB>22</SB>. The fourth input terminal I<SB>14</SB>of the first crosspoint switch 3 is connected to the first output terminal O<SB>21</SB>of the second crosspoint switch 4, and the second output terminal O<SB>12</SB>of the first crosspoint switch 3 is connected to the first input terminal I<SB>21</SB>of the second crosspoint switch 4. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a signal input / output device and a signal transmission system for inputting / outputting an HDMI signal, such as an HDMI repeater.

  In recent years, AV (audio / visual) devices that comply with the HDMI (High Definition Multimedia Interface) standard, which is a digital input / output standard for image signals and audio signals, have become widespread. AV equipment compliant with the HDMI standard is connected by a dedicated HDMI cable, and transmits and receives image signals, audio signals, and control signals (hereinafter collectively referred to as “HDMI signals”) through the HDMI cable. Audio can be transmitted.

  Recently, it has a plurality of input terminals and a plurality of output terminals conforming to the HDMI standard, AV equipment is connected to each input / output terminal, and a DVD (digital versatile disc) recorder or game machine connected to the input terminal, for example. There has been proposed a signal input / output device called an HDMI repeater that can simultaneously output the HDMI signal to, for example, a television receiver or projector connected to an output terminal.

  In the HDMI repeater, as shown in FIG. 4, for example, a switch called a cross point switch having four input terminals and two output terminals is provided. The crosspoint switch 20 connects an HDMI signal from a source device connected to one of the input terminals to an arbitrary output terminal by switching an unillustrated switch provided inside in software to a desired state. Can output to other sink devices.

  In such a crosspoint switch 20, since the number of input terminals as parts is limited, it is desired to increase the number of input terminals so that a large number of source devices can be connected to the input side. Generally, in the cross point switch 20, there is a problem that when the number of input terminals is increased, the component configuration becomes complicated and the cost of the component itself increases.

  Therefore, in order to increase the number of input terminals at a low cost, as shown in FIG. 5, a configuration in which two crosspoint switches 21 and 22 are provided in the HDMI repeater 23 and the both are cascade-connected is conceivable. According to the figure, a game machine 11, a set top box 12 and a DVD player 13 as a plurality of source devices are connected to the input terminal of the first crosspoint switch 21, and a TV as a sink device, for example, is connected to one output terminal. John receiver 14 is connected. On the other hand, a BD (Blue-ray Disk) recorder 15 as a source device is connected to the input terminal of the second crosspoint switch 22, and a projector 16 as a sink device is connected to one output terminal. The other output terminal of the first crosspoint switch 21 is connected to the input terminal of the second crosspoint switch 22.

  According to such a configuration, the HDMI signal from the game machine 11 connected to the first crosspoint switch 21 is transmitted via the other output terminal of the first crosspoint switch 21 and the output terminal of the second crosspoint switch 22. Can be output to the projector 16. Further, the number of input terminals as a whole device can be increased as compared with one cross point switch. That is, one cross point switch shown in FIG. 4 has four inputs, and the HDMI repeater 23 shown in FIG. 5 has seven inputs.

  However, according to the above configuration, the HDMI signal from the source device (for example, the game machine 11) connected to the first crosspoint switch 21 is sent to the sink device (for example, the projector 16) connected to the second crosspoint switch 22. The HDMI signal from the source device (for example, the BD recorder 15) connected to the second crosspoint switch 22 can be output, but the sink device (for example, the television receiver 14) connected to the first crosspoint switch 21 can be output. ) Cannot be output. That is, since the first and second crosspoint switches 21 and 22 are cascade-connected, the second crosspoint switch 22 is connected to the rear stage side of the first crosspoint switch 21. For this reason, the above inconvenience occurs, and the convenience of the system is low.

  Note that Patent Document 1 relating to a device using a crosspoint switch includes Patent Document 1 shown below.

Japanese Patent Laid-Open No. 5-1992255

  The present invention has been conceived under the circumstances described above, and increases the number of input terminals and outputs an HDMI signal from a source device connected to any input terminal from any output terminal. It is an object of the present invention to provide a signal input / output device and a signal transmission system that can be used.

  In order to solve the above problems, the present invention takes the following technical means.

  According to the signal input / output device provided by the first aspect of the present invention, the signal input / output device has at least two or more input terminals and two or more output terminals, and conforms to the HDMI standard input from any one of the input terminals. A signal input / output device including a plurality of crosspoint switches from which one of the plurality of crosspoint switches outputs an HDMI signal to be output from any one of the output terminals. One of the output terminals of the other crosspoint switch is connected, and one of the output terminals of the one crosspoint switch is connected to one of the input terminals of the other crosspoint switch. It is characterized (claim 1).

  In the signal input / output device according to the present invention, each of the plurality of crosspoint switches includes a plurality of dedicated switches for enabling connection between any of the input terminals and any of the output terminals. (Claim 2).

  In the signal input / output device of the present invention, a source device that outputs the HDMI signal is connected to input terminals of the plurality of crosspoint switches, and the HDMI signal is input to output terminals of the plurality of crosspoint switches. It is preferable that a sink device to be connected is connected (claim 3).

  According to the signal input / output device provided by the second aspect of the present invention, the signal input / output device has at least two or more input terminals and two or more output terminals, and conforms to the HDMI standard input from any one of the input terminals. A signal transmission system including a plurality of signal input / output devices from which one of the plurality of signal input / output devices outputs an HDMI signal to be output from any one of the output terminals. Is connected to one output terminal of the other signal input / output device, and to one output terminal of the one signal input / output device is connected to one input terminal of the other signal input / output device. (Claim 4).

  In the signal transmission system, an HDMI dedicated cable may be used for each connection between the one signal input / output device and the other signal input / output device.

  According to the present invention, one of the input terminals of one crosspoint switch is connected to one of the output terminals of the other crosspoint switch, and one of the output terminals of one of the crosspoint switches is connected to the other One of the input terminals of the crosspoint switch is connected. In other words, the input / output terminals of one crosspoint switch and the other crosspoint switch are connected in a so-called scissors shape. Therefore, for example, an HDMI signal input to the input terminal of one crosspoint switch can be output from the output terminal of the other crosspoint switch, and conversely, input to the input terminal of the other crosspoint switch. The HDMI signal can be output from the output terminal of one of the crosspoint switches. Therefore, the number of input terminals as a signal input / output device can be increased, and an HDMI signal input from any one of the input terminals can be output from any output terminal of any crosspoint switch. Convenience as an apparatus can be improved.

  Other features and advantages of the present invention will become more apparent from the detailed description given below with reference to the accompanying drawings.

  Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the accompanying drawings.

  FIG. 1 is a configuration diagram showing an example of a signal transmission system according to the present invention. This signal transmission system is roughly configured by an HDMI repeater 1 as a signal input / output device, and a plurality of source devices and a plurality of sink devices (all of which will be described later). The HDMI repeater 1 corresponds to, for example, a so-called AV (audio / visual) amplifier.

  The HDMI repeater 1 includes a microcomputer 2 (hereinafter simply referred to as “microcomputer 2”), a first crosspoint switch 3, and a second crosspoint switch 4. More specifically, the HDMI repeater 1 includes at least one printed circuit board, and the microcomputer 2 and the first and second crosspoint switches 3 and 4 are mounted on the printed circuit board. Although other IC components are mounted on the printed circuit board, they are omitted in FIG.

  The HDMI repeater 1 is compliant with the HDMI (High Definition Multimedia Interface) standard, which is a digital input / output standard for HDMI signals, and includes a plurality of HDMI dedicated input terminals 1a, 1b, 1c, 1d, 1e, and 1f. It has output terminals 1g and 1h. The HDMI repeater 1 is configured to have 6 inputs and 2 outputs as a whole apparatus, and outputs an HDMI signal input from any input terminal to any desired output terminal.

The first crosspoint switch 3 shown in FIG. 1 includes four first to fourth input terminals I ₁₁ , I ₁₂ , I ₁₃ , I ₁₄ and two first and second output terminals O ₁₁ , O _12. The configuration is 4 inputs and 2 outputs. The second cross point switch 4 has the same number of terminals as the first cross point switch 3, and includes four first to fourth input terminals I ₂₁ , I ₂₂ , I ₂₃ , I ₂₄ and two First and second output terminals O ₂₁ and O ₂₂ are provided.

The first input terminal I ₁₁ of the first crosspoint switch 3 is connected to the input terminal 1 a of the HDMI repeater 1. Similarly, the second input terminal I ₁₂ is connected to the input terminal 1b, the third input terminal I ₁₃ is connected to the input terminal 1c, and the first output terminal O ₁₁ is connected to the output terminal 1g. The first input terminal I ₂₂ of the second crosspoint switch 4 is connected to the input terminal 1d of the HDMI repeater 1, the second input terminal I ₂₃ is connected to the input terminal 1e, the third input terminal I ₂₄ is connected to the input terminal 1f, and the second input terminal 1f is connected to the input terminal 1f. 2 the output terminal O ₂₂ is connected to the output terminal 1h.

  In the HDMI repeater 1, the input terminal of the first crosspoint switch 3 and the output terminal of the second crosspoint switch 4 are connected, and the input terminal of the second crosspoint switch 4 and the output terminal of the first crosspoint switch 3 are connected. The input / output terminals of the first and second cross-point switches 3 and 4 are connected in a so-called scissors shape. As a result, the number of input terminals of the HDMI repeater as a whole is increased, and image signals, audio signals, and control signals (hereinafter collectively referred to as “HDMI signals”) input from the input terminals of any of the crosspoint switches. Can be output from the output terminal of any crosspoint switch. Details will be described below.

  In general, a source device that outputs an HDMI signal is connected to an input terminal of the HDMI repeater 1. Further, the output terminal of the HDMI repeater 1 is connected to a sink device that receives an HDMI signal and outputs an image signal and an audio signal to the outside from a display device, a speaker (both not shown), and the like.

  According to FIG. 1, source devices such as a game machine 11, a set top box 12, a DVD player 13, and a BD (Blue-ray Disk) recorder 15 are connected to input terminals 1 a, 1 b, 1 c, and 1 d of the HDMI repeater 1. ing. Sink devices such as a television receiver 14 and a projector 16 are connected to the output terminals 1 g and 1 h of the HDMI repeater 1.

  Each of these source devices and sink devices is compliant with the HDMI standard described above, and each source device and sink device is provided with an HDMI standard HDMI connection terminal (not shown). Therefore, when these source device and sink device are connected to the HDMI repeater 1, dedicated HDMI cables 5 conforming to the HDMI standard are used.

  Here, the source device and the sink device connected to the HDMI repeater 1 will be briefly described. The game machine 11 is operated by a user using an operation controller (not shown) while loading a game program stored in, for example, a DVD-ROM. Based on the above, a predetermined game is advanced, and an HDMI signal in the progress of the game is output to the HDMI repeater 1.

  The set top box 12 is a device capable of receiving a broadcast signal from, for example, a cable television, and outputs an HDMI signal based on the broadcast signal to the HDMI repeater 1. The DVD player 13 is a device for reproducing a DVD, and outputs an HDMI signal recorded on the DVD to the HDMI repeater 1. The BD recorder 15 is a device for reproducing a BD disc, and outputs the HDMI signal recorded on the BD disc to the HDMI repeater 1.

  The television receiver 14 as a sink device has a liquid crystal display panel or a plasma panel, for example, and displays an image signal from the HDMI repeater 1 on the panel, or an audio signal from the HDMI repeater 1 with a built-in speaker or the like. Output to the outside.

  The projector 16 is a device that projects an image or video, for example, on a large screen (not shown). In this case, the sound may be output from a separately provided speaker system such as a home theater system.

  Each source device and sink device can be connected to arbitrary input terminals and output terminals as long as there is no error in input and output. That is, the above-described source device and sink device may be connected to input terminals and output terminals other than those described above.

  Further, the game machine 11, the set top box 12, the DVD player 13, and the BD recorder 15 as source devices are examples, and other source devices may be connected instead. For example, other source devices 17 and 18 (for example, a DVD recorder) may be connected to the input terminals 1 e and 1 f of the HDMI repeater 1. Similarly, the television receiver 14 and the projector 16 as sink devices are also examples, and other source devices (for example, a monitor device of a personal computer or a second television receiver) are connected instead. May be.

  The HDMI cable 5 can transmit and receive an HDMI signal between devices connected to each other. The HDMI cable 5 has a plurality of signal lines corresponding to the pin arrangement of the HDMI terminals.

  The HDMI terminal has, for example, a pin arrangement of 19 pins in total, and a unique number is determined for each pin, and the type of signal transmitted through each pin is also determined in advance. For example, an image signal and an audio signal are transmitted through the first to twelfth pins. A control signal such as a command and data by CEC (consumer electronics control) is transmitted through the 13th pin, and a control signal of a hot plug signal is transmitted through the 19th pin.

  Here, the CEC is a function capable of mutually controlling AV devices by transmitting and receiving a predetermined command (hereinafter referred to as “CEC command”) through a CEC control line (not shown) included in the HDMI cable 5. I mean. In CEC, an AV device provider can create an arbitrary CEC command, and AV devices can be controlled with each other using this CEC command. The hot plug signal is used to detect whether or not the partner AV device connected by the HDMI cable 5 is in an operating state.

As shown in FIG. 1, the first crosspoint switch 3 includes a plurality of (eight in FIG. 1) switches S ₁₁ , S ₁₂ , S ₁₃ , S ₁₄ , S ₂₁ , S ₂₂ , S ₂₃ , S ₂₄ (hereinafter referred to as “first cross point switch 3”). Are collectively referred to as “switch S”). The switch S is a switch for switching the signal flow in each of the first and second crosspoint switches 3 and 4 and is software-based by a control signal from the microcomputer 2 generated based on a user's setting operation. Be controlled. The second cross point switch 4 also has a switch S similar to the first cross point switch 3. The first and second crosspoint switches 3 and 4 may include a remote control device (not shown), and may switch the signal flow by the switch S by, for example, infrared communication.

The switches S of the first crosspoint switch 3 are arranged in a grid of 2 rows and 4 columns and can be connected to each other (in FIG. 1, each switch S is described as being directly connected. However, whether or not connection is possible is determined as necessary.) The switch S ₁₁ arranged in the first column sets the first input terminal I ₁₁ and the first output terminal O ₁₁ in a connectable state. That is, when the switch S ₁₁ is turned on, the HDMI signal from the game machine 11 connected to the first input terminal I ₁₁ is connected to the first output terminal O ₁₁ via the switch S _11. It becomes the state that is output to.

Similarly, the switch S ₁₂ can connect the second input terminal I ₁₂ and the first output terminal O _11, and the switch S ₁₃ connects the third input terminal I ₁₃ and the first output terminal O _11. In a possible state, the switch S ₁₄ sets the fourth input terminal I ₁₄ and the first output terminal O ₁₁ to be connectable.

The switch S ₂₁ can connect the first input terminal I ₁₁ and the second output terminal O _12, and the switch S ₂₂ can connect the second input terminal I ₁₂ and the second output terminal O _12. the state, the switch S ₂₃ is in the third connectable to the input terminal I ₁₃ and the second output terminal O ₁₂ and the switch S ₂₄ is a fourth input terminal I ₁₄ and a second output terminal O ₁₂ Each is set in a connectable state.

  In the first crosspoint switch 3, once one of the switches is turned on, other switches arranged in the same row (lateral direction) with the switch are not turned on. However, when any one of the switches is turned on, the other switches arranged in the same row (vertical direction) can be turned on.

  The switch S of the second crosspoint switch 4 is also arranged in substantially the same manner as the switch S of the first crosspoint switch 3 and has a setting function for connecting input / output terminals.

According to the configuration of the switch S, the first crosspoint switch 3 can output the HDMI signal input from one of the input terminals to a desired output terminal based on the on / off state of the switch S. . For example, the first crosspoint switch 3 outputs an HDMI signal from the game machine 11 connected to the first input terminal I ₁₁ to the television receiver 14 connected to the first output terminal O ₁₁ . The first cross-point switch 3, an HDMI signal from the set top box 12 connected to the second input terminal I _12, is outputted to the second output terminal O _12. These outputs can be performed simultaneously.

Further, the first crosspoint switch 3 can simultaneously output the HDMI signal from the game machine 11 connected to the first input terminal I ₁₁ to the first output terminal O ₁₁ and the second output terminal O ₁₂ in parallel. . Further, the first crosspoint switch 3 may output the HDMI signal from the DVD player 13 connected to the third input terminal I ₁₃ from the first output terminal O ₁₁ instead of the HDMI signal of the game machine 11. it can. However, it is impossible to simultaneously output the HDMI signal from the game machine 11 and the HDMI signal from the set top box 12 to the first output terminal O ₁₁ .

In the HDMI repeater 1, is connected to the first to fourth input terminal I ₁₄ of crosspoint switch 3 and the first output terminal O ₂₁ of the second cross point switch 4 is connected (in practice by the pattern on the printed circuit board ), The first input terminal I _{21 of} the second crosspoint switch 4 and the second output terminal O _{12 of} the first crosspoint switch 3 are connected. That is, the input / output terminals of the first crosspoint switch 3 and the second crosspoint switch 4 are connected in the form of so-called scissors.

In the above configuration, for example, the output of the set top box 12 connected to the second input terminal I ₁₂ of the first crosspoint switch 3 is sent to the projector 16 connected to the second output terminal O ₂₂ of the second crosspoint switch 4. Consider the case of trying to output. In this case, the first crosspoint switch 3, it is necessary to output an HDMI signal input from the second input terminal I ₁₂ once the second output terminal O _12, the switch S ₂₂ is turned on. On the other hand, the second crosspoint switch 4, since the HDMI signal input from the first input terminal I ₂₁ is required to be output to the second output terminal O _22, the switch S ₂₁ is turned on.

As a result, the output from the set top box 12 connected to the second input terminal I ₁₂ of the first crosspoint switch 3 is the second input terminal I ₁₂ , switch S ₂₂ , second output of the first crosspoint switch 3. The voltage is supplied to the projector 16 via the terminal O ₁₂ , the first input terminal I _{21 of} the second crosspoint switch 4, the switch S ₂₁ and the second output terminal O ₂₂ .

Similarly, for example, the output of the BD recorder 15 connected to the second input terminal I ₂₂ of the second crosspoint switch 4 is used as the television receiver 14 connected to the first output terminal O ₁₁ of the first crosspoint switch 3. Output from the BD recorder 15 connected to the second input terminal I ₂₂ of the second crosspoint switch 4 is output from the second input terminal I _{22 of} the second crosspoint switch 4, the switch S ₁₂ , The first output terminal O ₂₁ , the fourth input terminal I _{14 of} the first crosspoint switch 3, the switch S ₁₄ and the first output terminal O ₁₁ are supplied to the television receiver 14.

  As described above, according to the present embodiment, the input terminals and the output terminals of the first crosspoint switch 3 and the second crosspoint switch 4 are connected to each other in the form of a pair, so that the HDMI repeater 1 as a whole is connected. The number of input terminals can be easily increased. Then, the HDMI signal input from the input terminal of any crosspoint switch can be output from the output terminal of any crosspoint switch.

  That is, when a plurality of crosspoint switches are cascade-connected in order to simply increase the number of input terminals, as described in the background art section, the HDMI signal input from any of the crosspoint switch input terminals is In some cases, it is impossible to output from the output terminal of a crosspoint switch different from the crosspoint switch. In this embodiment, the input / output terminals of the first and second crosspoint switches 3 and 4 are connected to each other. By connecting in the form of cliff, the above problems can be solved and the HDMI repeater 1 having high convenience can be provided.

  Of course, the scope of the present invention is not limited to the embodiment described above. For example, in the above-described embodiment, an HDMI repeater including two crosspoint switches has been described. However, the number of crosspoint switches to be generated is not limited to two. For example, as shown in FIG. 2, an HDMI repeater may be configured by three crosspoint switches.

That is, in the HDMI repeater 1A shown in FIG. 2, a third crosspoint switch 6 is added to the configuration shown in FIG. 1, and the fourth input terminal I _{24 of} the second crosspoint switch 4 and the third crosspoint switch 6 are added. Is connected to the first output terminal O _31, and the first input terminal I _{31 of} the third crosspoint switch 6 is connected to the second output terminal O _{22 of} the second crosspoint switch 4, that is, the second crosspoint switch. 4 and the third crosspoint switch 6 are connected to each other.

  With this configuration, for example, the HDMI signal of the source device connected to the input terminal of the first crosspoint switch 3 can be output from the output terminal of the third crosspoint switch 6, while the input terminal of the third crosspoint switch 6 The HDMI signal of the source device connected to can be output from the output terminal of the first crosspoint switch 3. In this way, the number of crosspoint switches to be connected can be three or more as shown in FIG.

  The crosspoint switch is not particularly limited to the 4-input 2-output configuration shown in FIGS. 1 and 2, but the device configuration becomes complicated as the number of input terminals and output terminals increases, so that appropriate input / output is possible. A crosspoint switch having a number of terminals is desirable.

  Further, the idea of opening the cross point switches can be applied to a signal transmission system having a plurality of HDMI repeaters.

  FIG. 3 is a diagram illustrating a configuration of a signal transmission system having a plurality of HDMI repeaters. This signal transmission system is roughly configured by first and second HDMI repeaters 7 and 8, first and second HDMI cables 9 and 10, a plurality of source devices, and a plurality of sink devices. The first HDMI repeater 7 and the second HDMI repeater 8 are not necessarily arranged adjacent to each other, and may be arranged in another room in the house, for example.

  The first and second HDMI repeaters 7 and 8 have a plurality of HDMI dedicated input terminals 7a to 7d and 8a to 8d and a plurality of output terminals 7e, 7f, 8e and 8f, respectively, and have the switch S described above. is doing. The first and second HDMI repeaters 7 and 8 are to output an HDMI signal input from any one of the input terminals to any desired output terminal.

  In this signal transmission system, the input and output terminals of the first and second HDMI repeaters 7 and 8 are connected to each other by the first and second HDMI cables 9 and 10 in the form of a tear. As a result, the number of input terminals can be increased as a whole signal transmission system, and an HDMI signal input from any HDMI repeater input terminal can be output from any HDMI repeater output terminal.

It is a figure which shows the structure of the signal transmission system to which the HDMI repeater based on this invention is applied. It is a figure which shows the structure of the modification of a signal transmission system. It is a figure which shows the structure of the other modification of a signal transmission system. It is a schematic diagram of a crosspoint switch. It is a figure which shows the structure of the conventional signal transmission system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 HDMI repeater 2 Microcomputer 3 1st crosspoint switch 4 2nd crosspoint switch 5 HDMI cable 11 Game machine 12 Set top box 13 DVD player 14 Television receiver 15 BD recorder 16 Projector S switch

Claims (5)

A plurality of crosspoint switches that have at least two or more input terminals and two or more output terminals, and that output HDMI signals conforming to the HDMI standard input from any of the input terminals from any of the output terminals A signal input / output device comprising:
The output terminal of one of the other crosspoint switches is connected to the input terminal of one of the plurality of crosspoint switches, and the output terminal of one of the crosspoint switches is connected to any one of the output terminals of the one crosspoint switch. Is a signal input / output device to which one of the input terminals of the other crosspoint switch is connected.   2. The signal input according to claim 1, wherein each of the plurality of crosspoint switches includes a plurality of dedicated switches for enabling any one of the input terminals and one of the output terminals to be connected therein. Output device. A source device that outputs the HDMI signal is connected to input terminals of the plurality of crosspoint switches,
The signal input / output device according to claim 1, wherein a sink device that inputs the HDMI signal is connected to output terminals of the plurality of crosspoint switches. A plurality of signal inputs / outputs that have at least two or more input terminals and two or more output terminals and that output HDMI signals conforming to the HDMI standard input from any of the input terminals from any of the output terminals A signal transmission system including a device,
One of the plurality of signal input / output devices is connected to one of the input terminals of one of the signal input / output devices, and is connected to one of the output terminals of the other signal input / output device. Any one of the other signal input / output devices is connected to the output terminal of the signal transmission system.   The signal transmission system according to claim 4, wherein an HDMI dedicated cable is used for each connection between the one signal input / output device and the other signal input / output device.

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