JP2015008372A - Image apparatus and image apparatus control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image apparatus capable of confirming whether or not another image apparatuses have been controlled in response to a command.SOLUTION: A monitor 10 superimposes a command for controlling monitors 11 to 15 on an ancillary area allocated to a blanking period of an image signal based on an SDI standard. The monitor 10 confirms whether or not response data to superimpose when the monitors 11 to 15 control their image apparatuses in response to the command is included in the ancillary area of the image signal from the monitor 15. The monitor 10 presents whether or not the monitors 11 to 15 have been controlled in response to the command.

Description

  The present invention relates to a video device that transmits a video signal to another video device or receives a video signal from another video device based on the SDI (Serial Digital Interface) standard, and a video device control method.

  As one of the high-speed serial interface standards, the SDI standard capable of transmitting uncompressed digital video signals and digital audio signals through one coaxial cable is mainly used in professional video equipment. In the SDI standard, a BNC connector is used.

  In the SDI standard, a command for controlling a video device can be transmitted using an ancillary area (preliminary area) allocated in a blanking period of a video signal. As a result, a plurality of video devices are connected in series, and a command transmitted to one video device (parent device) is sequentially transmitted to the other video devices (slave devices) connected in series. The whole of the plurality of video devices can be controlled according to the command (see Patent Document 1).

JP 2011-2223078 A

  However, since the SDI standard is a one-way transmission standard, the parent device and the operator who operates the parent device cannot know whether or not each child device is controlled in response to a command. Therefore, it is desirable that the main device or the operator be a video device that can confirm whether or not each child device is controlled in response to a command.

  In order to meet such a demand, the present invention transmits a command to one video device, and when each of the other video devices connected in series is controlled by the command, It is an object of the present invention to provide a video device and a video device control method capable of confirming whether the device is controlled in response to a command.

  In order to solve the above-described problems of the conventional technology, the present invention superimposes a command superimposing unit that superimposes a command for controlling another video device on an ancillary region allocated in a blanking period of a video signal based on the SDI standard. A response data confirmation unit for confirming whether the ancillary area includes response data to be superimposed when the other video device controls its own video device in response to the command; and the response Control for confirming whether or not the other video equipment is controlled in response to the command based on response data confirmation information in which the data confirmation unit confirms whether or not the response data is included in the ancillary area A video device characterized in that the video equipment is provided.

  In order to solve the above-described problems of the conventional technology, the present invention superimposes a command superimposing unit that superimposes a command for controlling another video device on an ancillary region allocated in a blanking period of a video signal based on the SDI standard. A response data confirmation unit for confirming whether the ancillary area includes response data to be superimposed when the other video device controls its own video device in response to the command; and the response Provided is a video device comprising: a control unit that controls the data confirmation unit to supply response data confirmation information that confirms whether or not the response data is included in the ancillary region to an external device. .

  In order to solve the above-described problems of the related art, the present invention provides a receiving unit that receives a video signal based on the SDI standard transmitted from a video device connected to a higher level, and a blanking period of the video signal. A command extraction unit that extracts a command superimposed on the allocated ancillary region, and a response data superimposition unit that superimposes response data on the ancillary region when controlling its own video equipment in response to the command; There is provided a video device comprising: a transmission unit that transmits a video signal on which the command and the response data are superimposed to a video device connected to a lower side.

  In order to solve the above-described problems of the related art, the present invention provides a plurality of video devices as slave units in series from the highest slave unit to the lowest slave unit with respect to the video device as the master unit. Connected, the lowest slave unit is connected to the master unit, and a command for controlling the master unit is transmitted to the master unit by the operation unit. The master unit transmits a video signal based on the SDI standard. The command is superimposed on the ancillary area allocated in the blanking period, and the slave units respectively extract the command and control their own video equipment in response to the command. When controlling its own video equipment, the slave unit superimposes response data on the ancillary area, and the slave units except the lowest slave unit respectively display the video signal on which the command and the response data are superimposed on the lower side. To the child machine And Shin, the lowest child machine, a control method of the video apparatus and transmits a video signal to the command and the response data is superimposed on the master unit.

  According to the video device and the video device control method of the present invention, when the operator transmits a command to one video device and controls each of the other video devices connected in series by the command, It is possible to confirm whether or not other video equipment is controlled in response to the command.

1 is a block diagram showing an overall configuration of a system in which a plurality of monitors including video equipment of the first embodiment are connected in a daisy chain format. It is a block diagram which shows the specific internal structure of the video equipment of 1st Embodiment, and shows the usage pattern when using the video equipment of 1st Embodiment as a main | base station. It is a block diagram which shows the specific internal structure of the video equipment of 1st Embodiment, and shows the usage type in the case of using the video equipment of 1st Embodiment as a subunit | mobile_unit. It is a figure which shows an example of the data structure in the case of superimposing a command etc. on the ancillary area | region of a video signal. It is a block diagram which shows the whole structure of the system which connected the some monitor containing the video equipment of 2nd Embodiment in the daisy chain format. It is a partial block diagram which shows the internal structure of the video equipment of 2nd Embodiment.

  Hereinafter, embodiments of a video device and a control method of the video device will be described with reference to the accompanying drawings. In each embodiment, a case where the video device is a monitor that displays a video signal will be described as an example.

<First Embodiment>
In FIG. 1, a monitor 11 as a slave unit 1 is connected to a monitor 10 as a master unit. A monitor 12 as a slave unit 2 is connected to the monitor 11. A monitor 13 as a slave unit 3 is connected to the monitor 12. A monitor 14 as a slave unit 4 is connected to the monitor 13. A monitor 15 as a slave unit 5 is connected to the monitor 14. The monitor 15 is connected to the monitor 10.

  The monitor 10 is connected in series from the monitor 11 of the child device 1 that is the highest child device to the monitor 15 of the child device 5 that is the lowest child device in a daisy chain format. The number of monitors as slave units is not limited to five, and may be an arbitrary number.

  The monitors 10 to 15 are connected to each other by one coaxial cable and a BNC connector. Each of the monitors 10 to 15 transmits and receives video signals based on the SDI standard. The audio signal transmission / reception is omitted.

  An operating unit 20 for operating the monitor 10 is connected to the monitor 10. The operation unit 20 may be an external operation unit separate from the monitor 10, or may be an operation button provided on the housing of the monitor 10. For example, the operation unit 20 supplies a power on / off command and other trigger input commands to the monitor 10.

  A video output device 30 is connected to the monitor 10. The video output device 30 is, for example, an imaging device or a video playback device. The video output device 30 transmits a video signal to the monitor 10 based on the SDI standard. The monitor 10 transmits a video signal to the monitor 11 based on the SDI standard. Similarly, the monitors 12 to 14 sequentially transmit video signals to the monitors 13 to 15 based on the SDI standard.

  As a result, the video signal output from the video output device 30 is displayed on all the monitors 10 to 15.

  When a predetermined command is supplied to the monitor 10 by the operation unit 20, the monitor 10 is controlled in response to the command. The command supplied to the monitor 10 is superimposed on the ancillary area allocated in the blanking period of the video signal and is sequentially transmitted to the monitors 11 to 15. Accordingly, the monitors 11 to 15 are also controlled in response to commands in the same manner as the monitor 10.

  The monitor 10 preferably superimposes the command on each ancillary area of each of a plurality of consecutive frames. In this way, the monitors 11 to 15 can be remotely controlled almost certainly.

  For example, when a command to turn on the power is supplied to the monitor 10 by the operation unit 20, the monitor 10 superimposes the supplied command to turn on the power on the ancillary area of each of a plurality of consecutive frames. To 15 in turn. As a result, the monitors 10 to 15 are sequentially turned on.

  Similarly, when a command to turn off the power is supplied to the monitor 10 by the operation unit 20, the monitor 10 superimposes the supplied command to turn off the power on an ancillary area of each of a plurality of consecutive frames. Sequentially supplied to 11-15. As a result, the power sources of the monitors 10 to 15 are also sequentially turned off.

  In some cases, it is not desired to remotely control a part of the monitors 11 to 15 by the monitor 10. The monitor 10 can select whether to enable or disable the remote control of each of the monitors 11 to 15. In addition, it is also possible for the monitors 11 to 15 to select whether to enable or disable remote control from the outside.

  In this embodiment, as will be described in detail later, when the monitors 11 to 15 are controlled in response to a command, the response data is superimposed on the ancillary area of the video signal and supplied to the subsequent monitor. The monitor 10 is supplied from the monitor 15 with video signals on which the response data of the monitors 11 to 15 are superimposed. Therefore, the monitor 10 can know whether or not the monitors 11 to 15 are controlled in response to the command.

  All the internal configurations of the monitors 10 to 15 are common. However, the circuit block used in the internal configuration is partially different between the monitor 10 used as a parent device and the monitors 11 to 15 used as child devices. That is, the monitors 10 to 15 can be used as a master unit or a slave unit depending on the usage form of the internal configuration.

  A specific internal configuration and operation of the monitor 10 will be described with reference to FIG. In FIG. 2, a video output device 30 is connected to an input terminal Bin1 of the BNC connector, and a video signal from the video output device 30 is supplied. The video signal output from the output terminal of the monitor 15 is supplied to the input terminal Bin2 of the BNC connector. The video signal is a serial digital video signal.

  The video signal input to the input terminal Bin1 is supplied to the SDI equalizer 101. The video signal input to the input terminal Bin2 is supplied to the SDI equalizer 102. The input terminal Bin1 and the SDI equalizer 101, and the input terminal Bin2 and the SDI equalizer 102 each operate as a receiving unit that receives a video signal based on the SDI standard.

  Each of the SDI equalizers 101 and 102 converts the input video signal into a video signal in the form of a differential signal, and supplies the video signal to the serial / parallel converter 103. The serial / parallel converter 103 converts the input serial video signal into a parallel video signal.

  In the monitor 10 serving as a parent device, the switches 104 and 107 are connected to the terminal ta and the switches 113 and 116 are connected to the terminal tb based on control by the control unit 108. When the switches 104 and 107 are connected to the terminal ta, the command extraction unit 105 and the response data superimposition unit 106 become inoperative. The operations of the command extraction unit 105 and the response data superposition unit 106 will be described with reference to the internal configuration of the monitors 11 to 15 serving as slave units.

  The video signal output from the serial / parallel converter 103 is input to the video signal processor 109. The video signal processing unit 109 processes the input video signal and causes the display unit 110 to display the video signal.

  The video signal output from the serial / parallel converter 103 is input to the response data check unit 114 via the switches 104, 107, and 113. The response data confirmation unit 114 confirms whether or not the response data superimposed by the monitors 11 to 15 is included in the ancillary region of the video signal.

  The response data confirmation unit 114 supplies response data confirmation information indicating whether or not the response data of each of the monitors 11 to 15 is included to the control unit 108 and the command superposition / validation / invalidity setting unit 115.

  Based on the response data confirmation information, the control unit 108 confirms whether or not the monitors 11 to 15 are controlled in response to the command, and visual information such as character information indicating whether or not the monitor 11 to 15 is controlled in response to the command. The OSD (On Screen Display) generation unit 111 is controlled so as to be displayed on the display unit 110. The visual information generated by the OSD generation unit 111 is supplied to the video signal processing unit 109. The video signal processing unit 109 superimposes visual information on the video signal and supplies it to the display unit 110.

  The video signal processing unit 109, the OSD generation unit 111, and the display unit 110 are examples of a presentation unit that visually presents to the operator whether or not the monitors 11 to 15 are controlled in response to a command. Based on the response data confirmation information, the control unit 108 controls the presentation unit to present whether the monitors 11 to 15 are controlled in response to the command.

  The command input by the operation unit 20 is input to the control unit 108. The control unit 108 controls the controlled unit 112 according to the command. The controlled unit 112 is an arbitrary part controlled by the control unit 108, and is, for example, a power control unit or an input switching unit. For example, when the controlled unit 112 is a power control unit and the command is a command to turn on the power, the control unit 108 controls the power control unit to turn on the monitor 10.

  The control unit 108 controls the command superimposition / validity / invalidity setting unit 115 to superimpose the command input by the operation unit 20 on the ancillary region of the video signal. The command superimposition / validity / invalidity setting unit 115 superimposes the command input by the operation unit 20 on the ancillary area, and supplies the video signal on which the command is superimposed to the parallel / serial conversion unit 117 via the switch 116. .

  The command superimposition / validation / invalidation setting unit 115 sets whether to enable or disable the remote control of the monitors 11 to 15 according to the setting by the operation unit 20. The command superimposition / valid / invalid setting unit 115 superimposes setting data for setting the validity / invalidity of each of the monitors 11 to 15 on the ancillary area.

  When the response data confirmation information is input from the response data confirmation unit 114, the command superimposition / validation / invalidity setting unit 115 invalidates the remote control of the monitor that has transmitted the response data among the monitors 11 to 15. The setting data indicating validity is replaced with the setting data indicating invalidity.

  The command is a command for turning on the power. For example, it is assumed that the monitor 11 turns on the power of the monitor 11 in response to the command and superimposes response data on the ancillary area. When the monitor 10 receives the video signal on which the response data of the monitor 11 is superimposed, the response data confirmation unit 114 confirms that the response data of the monitor 11 exists.

  If the setting data for setting the remote control valid / invalid of the monitor 11 remains valid, the monitor 11 accepts a command to turn on the power again even though the power is already turned on. Thus, the process for turning on the power is executed again.

  Therefore, when the response data confirmation information is input from the response data confirmation unit 114, the command superimposition / validity / invalidity setting unit 115 cancels the remote control of the monitor that has transmitted the response data confirmation information. The setting data indicating validity superimposed on is replaced with setting data indicating invalidity.

  The command superimposition / validation / invalidity setting unit 115 stops the command superposition when it is confirmed that all the monitors 11 to 15 have transmitted the response data based on the response data confirmation information from the response data confirmation unit 114.

  In some situations, the command superimposition / validation / invalidity setting unit 115 may not be able to obtain response data confirmation information from the response data confirmation unit 114. In this case, the command superposition / validation / invalidation setting unit 115 may time out and stop the command superposition when the response data confirmation information is not obtained for a predetermined time.

  The parallel / serial converter 117 converts the input parallel video signal into a serial video signal. The SDI driver 118 converts the video signal of the differential signal into the original video signal in the form of a non-differential signal and supplies it to the output terminal Bout1 of the BNC connector.

  The output terminal Bout1 and the input terminal Bin1 of the monitor 11 shown in FIG. 3 are connected by a coaxial cable. The video signal output from the output terminal Bout1 is supplied to the input terminal Bin1 of the monitor 11. The SDI driver 118 and the output terminal Bout1 operate as a transmission unit that transmits a video signal to the monitor 11 connected to the lower side.

  A specific internal configuration and operation of the monitors 11 to 15 will be described with reference to FIG. In FIG. 3, the description of the parts described in FIG. 2 is omitted as appropriate.

  In the monitors 11 to 15 as slave units, the switches 104 and 107 are connected to the terminal tb and the switches 113 and 116 are connected to the terminal ta based on control by the control unit 108. When the switches 113 and 116 are connected to the terminal ta, the response data confirmation unit 114 and the command superimposition / valid / invalid setting unit 114 become inoperative.

  The video signal output from the serial / parallel conversion unit 103 is input to the command extraction unit 105 via the switch 104. The command extraction unit 105 extracts a command superimposed on the ancillary area of the video signal. The extracted command is supplied to the control unit 108.

  The control unit 108 controls the controlled unit 112 in response to the command. When the command is a command for turning on the power, the control unit 108 controls the controlled unit 112 that is a power supply control unit to turn on the monitors 11 to 15.

  When the control unit 108 executes the control in response to the command, the control unit 108 controls the response data superimposing unit 106 to superimpose the response data on the ancillary region of the video signal. The response data superimposing unit 106 superimposes response data on the ancillary area.

  The video signal on which the response data is superimposed is supplied to the parallel / serial conversion unit 117 via the switches 113 and 116. The video signal on which the command output from the output terminal Bout1 of the monitor 11 and the response data of the monitor 11 are superimposed is supplied to the input terminal Bin1 of the monitor 12.

  The video signal on which the command output from the output terminal Bout1 of the monitor 12 and the response data of the monitors 11 and 12 are superimposed is supplied to the input terminal Bin1 of the monitor 13. The video signal on which the command output from the output terminal Bout1 of the monitor 13 and the response data of the monitors 11 to 13 are superimposed is supplied to the input terminal Bin1 of the monitor 14.

  The video signal in which the command output from the output terminal Bout1 of the monitor 14 and the response data of the monitors 11 to 14 are superimposed is supplied to the input terminal Bin1 of the monitor 15. The video signal on which the command output from the output terminal Bout1 of the monitor 15 and the response data of the monitors 11 to 15 are superimposed is supplied to the input terminal Bin2 of the monitor 10 in FIG.

  In FIG. 3, an input terminal Bin1 and an SDI equalizer 101 operate as a receiving unit that receives a video signal based on the SDI standard transmitted from a monitor connected to the upper side. The SDI driver 118 and the output terminal Bout1 operate as a transmission unit that transmits a video signal on which a command and response data are superimposed to a video device connected to a lower side.

  2 and 3, when a predetermined command is input to the monitor 10 by the operation unit 20 and only the monitor 10 is controlled, the monitors 11 to 15 connected in series to the monitor 10 are respectively connected. Remotely controlled.

  When the monitors 11 to 15 are controlled in response to commands, video signals on which the respective response data are superimposed are supplied to the monitor 10. Therefore, the operator can confirm by the monitor 10 which of the monitors 11 to 15 is controlled and which is not controlled.

  In the above example, the OSD generation unit 111 generates visual information and causes the display unit 110 to display the visual information so that the operator can be presented with whether or not the monitors 11 to 15 are controlled in response to the command. I have to. This is merely an example, and the method for the operator to check whether or not the monitors 11 to 15 are controlled is not limited to the method of displaying visual information on the display unit 110.

  An example of a data structure in which commands, valid / invalid setting data, and response data are superimposed on the ancillary area of the video signal will be described with reference to FIG. Here, the video signal is assumed to be 10 bits.

  4, 1, 2, 3,... Indicate addresses in units of 10-bit data. As shown in FIG. 4, four addresses of predetermined 10-bit data are set as an identification signal superimposing region indicating that the data string includes command, valid / invalid setting data, and response data. When expressed in hexadecimal, the identification signal is, for example, “3FF”, “100”, “100”, “3FF”.

  When the monitor 10 superimposes a command on the ancillary area, the command superimposition / valid / invalid setting unit 115, for example, for five addresses following the identification signal of “3FF”, “100”, “100”, “3FF”. The command may be superimposed on the command superimposing area. The command extraction unit 105 of the monitors 11 to 15 may extract data included in the command superimposition area for five addresses following the identification signal as a command.

  Five addresses following the valid / invalid setting data superimposing area are set as the response data superimposing area. The four addresses following the response data superimposition area are set as an identification signal superimposition area indicating that the data string including the command, valid / invalid setting data, and response data has been completed. The identification signal superimposing region indicating the end can be omitted.

  In this embodiment, the valid / invalid setting data superimposing area is 50 bits, and if 1 bit is assigned to one monitor, the validity / invalidity of 50 monitors can be set.

  As shown in FIG. 4, setting data V10 to V15 indicating validity / invalidity of each of the monitors 10 to 15 are set from the head of the address 10. If the validity is set to “1” and all the monitors 10 to 15 are set to be valid, the setting data V10 to V15 are all “1”.

  If there are only five monitors as slave units, the sixth and subsequent bits may be set to “0” indicating invalidity.

  The monitor 10 is a parent device, and the setting data V10 indicating whether the monitor 10 is valid / invalid is not always necessary. The valid / invalid setting data may be assigned only to the monitor as a slave unit. In this case, it is possible to set the validity / invalidity of the monitor as 50 slave units.

  As described above, the monitors 10 to 15 can be used as a parent device or a child device depending on how the internal configuration is used. Therefore, the monitor 10 may be used as a slave unit. Therefore, as shown in FIG. 4, it is preferable to reserve a bit for setting the validity / invalidity of the monitor 10 as the master unit in the valid / invalid setting data superimposing area.

  Each bit in the 50-bit response data superimposing area indicates whether or not 50 monitors superimpose response data on the video signal.

  As shown in FIG. 4, response data R10 to R15 indicating whether each of the monitors 10 to 15 has controlled its own monitor in response to the command is superimposed from the beginning of the address 15.

  In this embodiment, since the monitor 10 is a master unit, the response data R10 is not actually superimposed. Similarly, since there is a possibility that a monitor as a master unit may be used as a slave unit, it is preferable to reserve a bit for superimposing response data by the monitor as the master unit.

  If all of the monitors 11 to 15 superimpose response data on the video signal and “1” indicates that the response data is superimposed, the response data R11 to R15 are all “1”.

  However, there is a case where all of the response data R11 to R15 are not “1” in the response data superimposing region of one frame. All of the response data R11 to R15 are “1” when all of the response data R11 to R15 are “1” when the response data superimposition area of the ancillary area over a plurality of frames is viewed. including.

Second Embodiment
The second embodiment will be described with reference to FIG. In the second embodiment shown in FIG. 5, a personal computer 20P is used in place of the operation unit 20 of the first embodiment shown in FIG. The personal computer 20P is also an operation unit. The personal computer 20P is an example of an external device.

  The monitor 10 and the personal computer 20P are serially connected or connected via a network. The monitor 10 and the personal computer 20P are bidirectionally connected.

  As shown in FIG. 6, the control unit 108 of the monitor 10 and the personal computer 20 </ b> P communicate bidirectionally via an input / output interface (I / F) 119. The command input by the personal computer 20P is supplied to the control unit 108 via the input / output I / F 119.

  When the response data confirmation unit 114 supplies the response data confirmation information to the control unit 108, the control unit 108 controls the input / output I / F 119 to supply the response data confirmation information to the personal computer 20P. As a result, the response data confirmation information is supplied to the personal computer 20P.

  Based on the response data confirmation information, the personal computer 20P can manage whether or not the monitors 11 to 15 are controlled in response to the command. The personal computer 20P can cause the display unit of the personal computer 20P to present whether or not the monitors 11 to 15 are controlled in response to the command.

  According to the second embodiment, instead of displaying on the display unit 110 of the monitor 10 whether or not the monitors 11 to 15 are controlled in response to the command (or in addition to the display on the display unit 110), a personal computer It becomes possible to monitor at 20P.

  The personal computer 20P is an example of an external device for monitoring whether the monitors 11 to 15 are controlled in response to a command. Instead of the personal computer 20P, a dedicated external device can be used for monitoring.

  In the second embodiment shown in FIG. 5, the internal configurations of the monitors 11 to 15 are the same as those in FIG. 3, and the operations of the monitors 11 to 15 are the same as those described in the first embodiment.

  In the first and second embodiments described above, the monitors 11 to 15 are remotely controlled by supplying commands to the monitor 10 from the operation unit 20 or the personal computer 20P. The monitors 11 to 15 can be collectively controlled by the remote control valid / invalid setting by the command superimposing / valid / invalid setting unit 115 of the monitor 10, or some of the monitors 11 to 15 can be individually controlled It can also be controlled.

  It is also possible to individually control the monitors 11 to 15 by individually operating the operation buttons provided on the housings of the monitors 11 to 15.

  In the first and second embodiments described above, the case where the video device is a monitor has been described, but the video device is not limited to a monitor. The video device may be a security device, a medical electronic device, a digital signage, a video conference system, a digital cinema, or the like, and may be any video device that handles a video signal based on the SDI standard.

  The present invention is not limited to the first and second embodiments described above, and various modifications can be made without departing from the scope of the present invention.

10 Monitor (base unit, video equipment)
11-15 Monitor (slave unit, video equipment)
20 Operation unit 20P Personal computer (external device)
101,102 SDI equalizer (receiver)
105 Command Extractor 106 Response Data Superimposing Unit 108 Control Unit 114 Response Data Confirming Unit 115 (Command Superimposing Unit, Valid / Invalid Setting Unit)
118 SDI driver (transmitter)
Bin1, Bin2 input terminal (receiver)
Bout1 output terminal (transmitter)

Claims (4)

A command superimposing unit that superimposes a command for controlling other video equipment on the ancillary area allocated in the blanking period of the video signal based on the SDI standard;
A response data confirmation unit for confirming whether or not the ancillary region includes response data to be superimposed when the other video device controls its own video device in response to the command;
The response data confirmation unit confirms whether the other video device is controlled in response to the command based on the response data confirmation information that confirms whether the response data is included in the ancillary area. A control unit,
A video apparatus comprising: The other video device is a plurality of video devices connected in series,
The video device according to claim 1, further comprising an enable / disable setting unit configured to set whether to enable or disable control by the command for the plurality of video devices. A receiving unit for receiving a video signal based on the SDI standard transmitted from a video device connected to the upper side;
A command extraction unit for extracting a command superimposed on an ancillary region allocated in a blanking period of the video signal;
A response data superimposing unit that superimposes response data on the ancillary area when controlling its own video equipment in response to the command;
A transmission unit that transmits a video signal on which the command and the response data are superimposed to a video device connected to a lower side;
A video apparatus comprising: Multiple video devices that are slave units are connected in series from the highest slave unit to the lowest slave unit, and the lowest slave unit is connected to the master unit with respect to the video device that is the master unit. ,
A command for controlling the parent device is transmitted to the parent device by the operation unit,
The master unit superimposes the command on the ancillary area allocated in the blanking period of the video signal based on the SDI standard,
Each of the slave units extracts the command, controls its own video equipment in response to the command,
When each of the slave units controls its own video equipment, it superimposes response data on the ancillary area,
The slave units excluding the lowest slave unit respectively transmit the video signal on which the command and the response data are superimposed to the slave unit on the lower side,
The video apparatus control method, wherein the lowest slave unit transmits a video signal on which the command and the response data are superimposed to the master unit.

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