JP2003319379A - Video data radio transmission system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a video data radio transmission system with excellent handleability for users. <P>SOLUTION: The video data radio transmission system includes: a plurality of slave units 1 to 4; a master unit 5 for controlling each of a plurality of the salve units 1 to 4; and a display means 7 connected to the master unit 5, and the system radios video data of a slave unit selected by the master unit 5 among a plurality of the salve units 1 to 4 to the master unit 5 and allows the display means 7 to display the video data. Each of the slave units 1 to 4 has relay means 20, 21, 23 for replaying the video data when the other slave unit transmits video data to the master unit 5. The master unit 5 includes selecting inhibit means 57, 59 for inhibiting the selection of the relay exclusive use slave unit for relaying the video data among a plurality of the slave units 1 to 4. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video data wireless transmission system suitable for use in guarding and monitoring parking lots and various facilities, and more particularly to a plurality of slave units having a television camera,
The present invention relates to a video data wireless transmission system including a master unit that controls each slave unit and receives video data from each slave unit and displays the video data on a monitor.

[0002]

2. Description of the Related Art As a conventional video data wireless transmission system, for example, one disclosed in Japanese Patent Laid-Open No. 2001-285844 is known. The system disclosed in this publication includes a center device (corresponding to a master device in the present invention),
Multiple wireless relay monitoring devices (corresponding to slave units in the present invention)
These devices are wirelessly connected to each other, and each wireless relay monitoring device is provided with a relay function of relaying data from another wireless relay monitoring device to the center device. All wireless relay monitoring devices are equipped with TV cameras. In the following, the center device will be referred to as a master device, and the wireless relay monitoring device will be referred to as a slave device.

[0003]

However, in the above-mentioned conventional video data wireless transmission system, since the video data from each slave is sequentially transmitted to the master, automatic switching of video is required. When performing, if there is a child device whose TV camera is broken or removed, or the video processing function (assuming that the data transmission function is normal) is broken, the parent device cannot obtain the image on the child device. , There is a problem that an abnormal image such as a screen with no image or a sandstorm / black screen is displayed. In other words, when the master unit automatically switches the video of each slave unit, when switching to the faulty slave unit, a screen without an image or a sandstorm
An abnormal image such as a black screen will be displayed.

Also, the route for transmitting data cannot be set only by the master unit. Furthermore, when a failure occurs in the child device, it is difficult for the parent device to identify the child device, which makes quick response difficult. As described above, the conventional video data wireless transmission system cannot be said to be user-friendly.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a video data wireless transmission system which is convenient for the user.

[0006]

A video data wireless transmission system according to the present invention comprises a plurality of slave units, a master unit for controlling each of the slave units, and a display unit connected to the master unit. In the video data wireless transmission system, which comprises wirelessly transmitting video data from a slave selected by the master among the plurality of slaves to the master and displaying the display on the display unit, the plurality of slaves Each of the slave units has a relay unit for relaying the video data when transmitting the video data from another slave unit to the master unit, and the master unit stores the video data among the plurality of slave units. It is characterized by having a selection prohibition means for prohibiting the selection of the relay-dedicated slave unit to be relayed.

With this configuration, the selection of the relay-dedicated slave unit for relaying the video data is prohibited. Therefore, when the master unit automatically switches the images of the slave units, the relay-dedicated slave unit is not switched, that is, The relay-dedicated slave unit is skipped, and it is possible to prevent an abnormal image such as a screen with no image or a sandstorm / black screen from being displayed. Also, if the TV camera is broken or the child device is broken, if you set the child device as a relay-only child device, abnormal images such as a screen with no image or a sandstorm / black screen will be displayed. Can be prevented.

Further, the video data wireless transmission system of the present invention comprises a plurality of slave units, a master unit for controlling each of the plurality of slave units, and display means connected to the master unit, In a video data wireless transmission system in which video data is wirelessly transmitted from the slave selected by the master among the slaves to the master and displayed on the display means, each of the slaves is , A relay unit for relaying the video data when transmitting the video data from another slave to the master, and the master is a slave selected by the master among the plurality of slaves. It has a route setting means for setting a route from the machine to the parent machine, and a route information display control means for controlling to display route information indicating the route on the display means.

With this configuration, the route from the slave selected by the master to the master can be set only by the master. In addition, since the route information indicating the route from the selected child device to the parent device is displayed by the parent device, any one of the child devices on the route has a failure (failure, radio wave does not reach, etc.) and is selected. When the image of the child device is not displayed, it is possible to confirm whether or not the relay is being performed and, if the image is being relayed, which child device is being relayed.

Further, in the video data wireless transmission system according to the present invention, in the video data wireless transmission system according to the second aspect, the master unit is on a route from the slave unit selected by the master unit to the master unit. When a failure occurs in any one of the child devices, it has a failed child device information display control means for detecting the child device having the failure and performing control for displaying at least information indicating this child device on the display means. Is characterized by.

With this configuration, at least the information (for example, the handset number) indicating the handset in which the failure has occurred is displayed.
The parent device can identify the child device and can quickly respond to the failure.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a block diagram of a video data wireless transmission system according to an embodiment of the present invention.

In FIG. 1, the video data wireless transmission system according to the present embodiment has four slave units 1 to 4, a master unit 5 for controlling each slave unit 1 to 4 by wireless, and this master unit. And a monitor 7 which is a display means connected to the machine 5. In addition, data is transmitted between each of the child devices 1 to 4 and the parent device 5 wirelessly. Here, regarding the audio data, from the respective slaves 1 to 4 to the master 5, and from the master 5 to each slave 1 to 1.
4 is transmitted bidirectionally, but video data is transmitted unidirectionally from each of the slave units 1 to 4 to the master unit 5. That is, each of the slaves 1 to 4 has a voice data transmission / reception function and a video data transmission function of transmitting video data obtained by connecting the television camera 6 to the master device 5.
It has a data relay function for relaying data (audio data or video data) when transmitting data (audio data or video data) between another child device and the parent device 5. For example, in this figure, when data transmission is performed between the slave unit 1 and the master unit 5, the slave unit 2 and the slave unit 4
Will relay. Also, when data transmission is performed between the slave 3 and the master 5, the slave 2 and the slave 4 relay. The slave unit 4 is a relay-dedicated slave unit that relays data. On the other hand, base unit 5
Has a voice data transmission / reception function, a video data reception function, and the like. The received video data is displayed on the monitor 7. The master unit 5 is connected to a dedicated controller 8 for registering information of the slave units 1 to 4.

Transmission data identification information including "route information" is added to the data transmitted between each of the slave units 1 to 4 and the master unit 5. The base unit 5 uses the transmitted data identification information to make a connection request or a video acquisition request to the handset units 1 to 3, and each of the handset units 1 to 3 responds by receiving the request from the base unit 5 And perform processing according to the request. As shown in the figure, the transmission data identification information is composed of "source" indicating the data source, "command" indicating the content, and "route information" indicating the route from the data source to the data transmission destination. When the slave units 1 to 3 and the master unit 5 refer to the “command” and recognize that the data is addressed to itself, the slave units 1 to 3 and the master unit 5 perform processing according to the data. Further, the slave units 1 to 4 and the master unit 5 relay (transfer) the data if the own device is described with reference to the “route information” and the data transmission destination is not the own device. If the data is irrelevant to the own device by referring to the "route information", the data is discarded. As described above, in the present embodiment, the television camera 6 is not connected to the slave 4, and only the data relay function is used.

Information of the slave units 1 to 4 (slave unit information) is registered in the master unit 5 by using the dedicated controller 8. In this case, the registered slaves are classified as follows according to their settings. The video of the connected TV camera 6 is transmitted, and data from other slaves is not relayed. The video of the connected TV camera 6 is transmitted, and the data from other slaves is also relayed. The TV camera 6 is not connected and only relays data from other slaves (relay only).

The slave unit information is centrally managed by the master unit 5. The slave unit set to No. 5 is prohibited from being selected by the master unit 5. That is, as shown in FIG.
When performing automatic switching of the images of 4 to 4, the child device (child device 4) set to is skipped without switching. Such skip setting can be performed not only for the relay-dedicated slave unit but also for the slave unit in which the TV camera has failed. By setting the skip setting, it is possible to prevent the display of an abnormal image such as a screen with no image or a sandstorm / black screen. The setting of selection prohibition is also effective when manually switching the video images of the respective slave units 1 to 4. In this case, it becomes impossible to select the child device 4.

Further, as shown in FIG. 2, on the monitor 7 connected to the base unit 5, the above-mentioned route information of the transmission data identification information is displayed at the lower end of the screen. This route information is, for example, "2 ----" when displaying an image of the child device 2.
-M ”is displayed and“ 3 ”is displayed when the image of the child device 3 is displayed.
-1-4-M "is displayed. Further, when displaying the image of the child device 3, if the child device 1 has a failure, the failure is notified from the immediately preceding child device, that is, the child device 4,
In addition to the display of "3-1-4-M", "1,
3? ”Is displayed. In this case, the reason why "1,3?" Is displayed is that the handset 1 has a fault, but the handset 3 ahead of the handset 1 may also have a fault. is there.

Next, the configuration of the base unit 5 will be described. FIG. 3 is a block diagram showing the configuration of the master unit 5. In this figure, the base unit 5 includes diversity antennas 51a and 51b, a wireless transmission / reception unit 52, a video output unit 53, an audio input / output unit 54, a controller transmission / reception unit 55, a memory unit 56, and setting contents. A holding unit 57, a control signal input / output unit 58, and a central control unit 59 are provided.

The radio transmitting / receiving unit 52 demodulates the original data from the radio signals received by the antennas 51a and 51b and outputs the demodulated data to the central control unit 59, and also modulates the data from the central control unit 59 to produce a radio signal as an antenna. 51a and 51b
Send more. The video output unit 53 converts the video data output from the central control unit 59 into an analog video signal and outputs it to the monitor 7. The voice input / output unit 54 converts the voice data output from the central control unit 59 into an analog voice signal, further amplifies it to a predetermined level, and outputs it to the speaker 9. The voice input / output unit 54 also converts the voice signal from the microphone 10 into digital voice data and outputs the digital voice data to the central control unit 59.

The controller transmission / reception unit 55 receives the operation signal from the dedicated controller 8 and outputs it to the central control unit 59, and also transmits the operation state signal output from the central control unit 59, which indicates the operating state, to the dedicated controller 8. To do. In the present embodiment, the signal transmission / reception between the controller transmission / reception unit 55 and the dedicated controller 8 is performed by wire, but naturally, it may be performed by wireless.

The memory unit 56 stores programs and the like for controlling the central control unit 59. Setting content holding unit 57
Holds the setting contents such as the identification information of the “parent device”, the registration information of the child device, and the route information of the child device. The setting contents may be stored in a semiconductor memory device such as a flash memory, or may be set using a dip switch or a rotary switch.
The central control unit 59 refers to this setting content when transmitting data with each of the slave units 1 to 4, and generates the above-mentioned transmission data identification information.

The control signal input / output unit 58 connects the external device 34 (see FIG. 4) capable of switching the plurality of television cameras 33 (see FIG. 4) to at least one of the slave units 1 to 4, The central controller 59 receives the operation signal from the external controller 11 for controlling the external device 34.
Output to the external controller 1 and a status signal indicating the status of each television camera 33 output from the central controller 59.
Output to 1. In the present embodiment, the signal transmission / reception between the control signal input / output unit 58 and the external controller 11 is performed by wire, but naturally, it may be performed by wireless. By connecting the external controller 11 to the master device 5 and connecting the external device 34 to at least one of the slave devices 1 to 4, the external device 34 can be remotely controlled by the external controller 11. That is, the external controller 11 can select a plurality of video cameras 33 connected to the external device 34 and can adjust (pan, tilt, zoom, etc.) each video camera 33.

The central control unit 59 is composed of a microcomputer or the like, and controls each unit of the equipment according to a control program stored in the memory unit 56. Central control unit 5
When the dedicated controller 8 performs a setting operation for each of the slave units 1 to 9, the operation content 9 holds the operation content in the setting content storage unit 57.

Here, for example, the setting of "transmitting the image of the connected TV camera 6 and not relaying data from other slaves" is made to the slaves 1 and 3.
The slave unit 2 is set to "transmit the video of the connected TV camera 6 and also relay the data from other slave units", and the slave unit 4 is set to "the TV camera 6 is not connected. , Only relay data from other slaves ”is set. After such settings are made, when the user performs an operation of automatically switching the respective slave units 1 to 4 with the dedicated controller 8, the central control unit 59 sequentially switches the slave units 1 to 3 to display the image. Is displayed on the monitor 7 (the image is displayed by switching as shown in FIG. 1). In addition to the images of the slaves 1 to 3, route information is displayed on the lower end of the screen of the monitor 7.

Next, the configurations of the slave units 1 to 4 will be described. FIG. 4 is a block diagram showing the configuration of the child device 1. Since the other slave units 2 to 4 have the same configuration as the slave unit 1,
Only the slave unit 1 will be described, and description of the other slave units 2 to 4 will be omitted. In this figure, a mobile device 1 includes a diversity antenna 15a and 15b and a wireless transceiver 1
6, a video input unit 17, an audio input / output unit 18, a controller transmission / reception unit 19, a memory unit 20, a setting content holding unit 21, a control signal input / output unit 22, and a central control unit 23. There is.

The radio transmission / reception unit 16 demodulates the original data from the radio signals received by the antennas 15a and 15b and outputs the demodulated data to the central control unit 23, and also modulates the data from the central control unit 23 to produce a radio signal as an antenna. 15a and 15b
Send more. The video input unit 17 converts the video signal output from the television camera 6 into digital video data and outputs the digital video data to the central control unit 23. The voice input / output unit 18 converts the voice data output from the central control unit 23 into an analog voice signal, further amplifies it to a predetermined level, and outputs it to the speaker 30. In addition, the voice input / output unit 18 uses the microphone 3
The voice signal from 1 is converted into digital voice data and output to the central controller 23.

The controller transmission / reception unit 19 receives an operation signal from the dedicated controller 32 used for operating the slave unit 1 and outputs it to the central control unit 23, and also the central control unit 23.
An operation state signal indicating the operation state output by the controller is transmitted to the dedicated controller 32. In the present embodiment, the signal transmission / reception between the controller transmission / reception unit 19 and the dedicated controller 32 is performed by wire, but naturally, it may be performed by wireless. Dedicated controller 3
Reference numeral 2 controls the switching device 35 that switches between the video camera 6 and the external device 34.

The memory section 20 stores a program for controlling the central control section 23 and the like. Setting contents holding unit 21
Holds the setting information such as the identification information of the "slave unit" and the slave unit number. The contents of this setting may be stored in a semiconductor memory element such as a flash memory, or may be set by a dip switch or a rotary switch. The central control unit 23 refers to the setting contents when transmitting data with the other slave units 2 to 4 or the master unit 5, and generates transmission data identification information.

The control signal input / output unit 22 is an external controller 1 which is connected to the base unit 5 capable of remotely controlling the external device 34.
1 (see FIG. 3) outputs the operation signal to the external device 34, and each TV camera 3 output from the external device 34.
The state signal indicating the state of No. 3 is output to the central control unit 23.

The central control section 23 is composed of a microcomputer or the like, and controls each section of the equipment according to a control program stored in the memory section 20. The central control unit 23, the memory unit 20, and the setting content holding unit 21 constitute a relay unit for relaying data. Further, the dedicated controller 8 constitutes a route setting means. Further, the setting content holding unit 57 and the central control unit 59 constitute a selection prohibition unit. Furthermore, the central control unit 59 constitutes route information display control means and obstacle child device information display control means.

Next, the operation of the video data wireless transmission system according to the present embodiment will be described with reference to FIGS.
An operation when the parent device 5 selects the child device 3 and displays the image while the child device 2 is displaying the image of the child device 2 will be described. In this case, the arrangement of the respective slaves 1 to 4 is assumed to be as shown in FIG. 5 to 7, a double square mark (for example, S130) indicates handling of received data, a square mark (for example, S100) in which one of the four corners is rolled indicates a state, and all of the four corners are indicated. The taken mark (eg, S110) indicates an event.

In FIG. 5, while the master unit 5 is displaying the image on the slave unit 2 (S100), the user uses the dedicated controller 8 to select and display the slave unit 3 ( In step S110), the master unit 5 disconnects the slave unit 2 first. Therefore, the transmission data identification information in which the sender is “master unit”, the command is “disconnect slave unit 2”, and the route information is “parent → 2” It is generated and transmitted (S120). This transmission data identification information is received only by the handset 2 (S130), and is discarded by the other handset 1, handset 3 and handset 4.

Upon receiving the transmission data identification information, the slave unit 2 sends the transmission data identification information with the originator being "slave unit 2", the command being "Slave unit 2 disconnected" and the route information being "2 → parent". It is generated and transmitted (S140).

The transmission data identification information transmitted from the handset 2 is discarded because it is irrelevant information for the handset 1, handset 3 and handset 4. When the parent device 5 normally receives the transmission data identification information from the child device 2 (S150), this time the child device 3 is connected. Therefore, the sender is “parent device” and the command is “child device 3”.
The connection data is generated and the transmission data identification information whose route information is “parent → 4 → 1 → 3” is generated and transmitted (S160).

Since this transmission data identification information is information that is not related to the slaves 1 to 3, it is discarded. When the handset 4 confirms from the received (S170) command of the transmission data identification information that it is not the process of its own but the relay, the sender is “handset 4”, the command is “connect handset 3”, Transmission data identification information whose route information is “parent → 4 → 1 → 3” is generated and transmitted (S180). This transmission data identification information is information that is not related to the slave unit 2, the slave unit 3, and the master unit 5, and is therefore discarded.

When the handset 1 confirms from the received (S190) command of the transmission data identification information that it is not a process by itself but a relay, the source is "handset 1" and the command is "handset 3". Connection data, and transmission data identification information having route information as “parent → 4 → 1 → 3” are generated and transmitted (S20).
0). This transmission data identification information is information that is not related to the child device 2, the child device 4, and the parent device 5, and is therefore discarded.

When the handset 3 confirms from the received (S210) command of the transmission data identification information that the process is performed by itself, the source is "handset 3" and the command is "handset 3 connection accepted". , And generates and transmits the transmission data identification information whose route information is “3 → 1 → 4 → parent” (S220). This transmission data identification information is information that is not related to the child device 2, the child device 4, and the parent device 5, and is therefore discarded.

When the handset unit 1 confirms from the received (S230) command of the transmission data identification information that it is not a process by itself but a relay, the sender is "handset unit 1" and the command is "handset unit 3". Connection accepted ", route information" 3 → 1 → 4 →
The transmission data identification information for "parent" is generated and transmitted (S
240). This transmission data identification information is information that is not related to the slave unit 2, the slave unit 3, and the master unit 5, and is therefore discarded.

When the slave unit 4 confirms from the received (S250) command of the transmission data identification information that the process is not the process by itself but the relay, the sender is "slave unit 4" and the command is "slave unit 3". Connection accepted ", route information" 3 → 1 → 4 →
The transmission data identification information for "parent" is generated and transmitted (S
260). This transmission data identification information is discarded because it is unrelated information in the slaves 1 to 3.

When the master unit 5 confirms the connection acceptance of the slave unit 3 from the command of the received transmission data identification information (S270), it next requests the slave unit 3 for the video data.
Transmission data identification information is generated and transmitted in which the transmission source is “parent device”, the command is “child device 3 video request”, and the route information is “parent → 4 → 1 → 3” (S280). This transmission data identification information is discarded because it is unrelated information in the slaves 1 to 3.

When the slave unit 4 confirms from the received (S290) command of the transmission data identification information that the process is not the process by itself but the relay, the sender is "slave unit 4" and the command is "slave unit 3". "Video request", route information "parent → 4 → 1 →
The transmission data identification information "3" is generated and transmitted (S
300). This transmission data identification information is information that is not related to the slave unit 2, the slave unit 3, and the master unit 5, and is therefore discarded.

When the handset 1 confirms from the received (S310) command of the transmission data identification information that it is not a process by itself but a relay, the source is "handset 1" and the command is "handset 3". "Video request", route information "parent → 4 → 1 →
The transmission data identification information "3" is generated and transmitted (S
320). This transmission data identification information is information that is not related to the child device 2, the child device 4, and the parent device 5, and is therefore discarded.

When the handset 3 confirms from the received command of the transmission data identification information (S330) that the process is performed by itself, the source is "handset 3" and the command is "handset 3 video data". , The route information is generated and transmitted as transmission data identification information that becomes “3 → 1 → 4 → parent” (S340). This transmission data identification information is information that is not related to the child device 2, the child device 4, and the parent device 5, and is therefore discarded.

When the handset 1 confirms from the command of the received transmission data identification information (S350) that it is not a process by itself but a relay, the source is "handset 1" and the command is "handset 3". "Video data", route information "3 → 1 → 4 →
The transmission data identification information for "parent" is generated and transmitted (S
360). This transmission data identification information is information that is not related to the slave unit 2, the slave unit 3, and the master unit 5, and is therefore discarded.

When the slave unit 4 confirms from the received command of the transmission data identification information (S370) that it is not a process by itself but a relay, the sender is "slave unit 4" and the command is "slave unit 3". "Video data", route information "3 → 1 → 4 →
The transmission data identification information for "parent" is generated and transmitted (S
380). This transmission data identification information is discarded because it is unrelated information in the slaves 1 to 3.

The master unit 5 displays the received video data of the slave unit 3 (S390) on the monitor 7 (S400). After that, until a new operation is performed by the dedicated controller 8 of the master unit 5, the master unit 5 sets the sender as the “master unit”, the command as “request for slave unit 3 image”, and the route information as “parent → 4”. → 1 →
3 ”, the transmission data identification information is generated and transmitted, and thereafter, the same processing is repeated.

By the way, if the handset 1 is out of order when the handset 2 is switched to the handset 3, as shown in FIG. 7, normal communication is performed between the handset 5 and the handset 2. But,
Communication will not be normally performed between the child device 4 and the child device 1. In FIG. 7, while the parent device 5 is displaying the image on the child device 2 (S500), the user uses the dedicated controller 8 to select and display the child device 3 (S500).
510), the master unit 5 disconnects the slave unit 2 first. Therefore, the transmission data identification information having the sender as the “master unit”, the command as “Disconnect unit 2”, and the route information as “Parent → 2” is transmitted. It is generated and transmitted (S520). This transmission data identification information is the handset 2
Is received only in S530 (S530), and is discarded in the other slaves 3 and 4. In addition, in the handset 1, neither the receiving operation nor the discarding operation is performed.

Upon receiving the transmission data identification information, the child device 2 sends the transmission data identification information with the originator being “child device 2”, the command being “child device 2 disconnected OK”, and the route information being “2 → parent”. It is generated and transmitted (S540).

The transmission data identification information transmitted from the handset 2 is discarded because it is irrelevant information in the handset 3 and the handset 4. In addition, in the handset 1, neither the receiving operation nor the discarding operation is performed. When the master unit 5 normally receives the transmission data identification information from the slave unit 2 (S550), this time the slave unit 3 is connected. Therefore, the sender is “master unit” and the command is “connect slave unit 3”. ,
Transmission data identification information whose route information is “parent → 4 → 1 → 3” is generated and transmitted (S560).

This transmission data identification information is information that is not related to the slave units 2-3, and is therefore discarded. In addition, in the handset 1, neither the receiving operation nor the discarding operation is performed. When the handset 4 confirms from the received command of the transmission data identification information (S570) that it is not a process by itself but a relay, the source is “handset 4”, the command is “connect handset 3”, Transmission data identification information whose route information is “parent → 4 → 1 → 3” is generated and transmitted (S580). This transmission data identification information is information that is not related to the slave unit 2, the slave unit 3, and the master unit 5, and is therefore discarded. Then, the child device 4 must return the transmission data identification information directed from the child device 1 to the child device 3 within a predetermined time from the time when the transmission data identification information is transmitted (S5).
90), and notifies the master unit 5 of the abnormality. In this case, the child device 4 generates and transmits the transmission data identification information in which the transmission source is "child device 4", the command is "child device 1 communication error", and the route information is "4 → parent" (S600). .

Upon receiving this transmission data identification information (S610), the base unit 5 displays at least information (1, 3?) Indicating that the handset 1 is abnormal on the monitor 7 (S6).
20). As a result, the user can at least recognize that there is an abnormality in the child device 1. After that, when the user makes a skip setting for skipping the slave unit 3 and subsequently performs an automatic switching operation between the slave unit 2 and the slave unit 3, a video in which the video of the slave unit 3 is skipped is displayed. In this case, since the slave unit 1 and the slave unit 4 are relay slave units, only the image of the slave unit 2 is displayed.

When the TV camera 6 simply fails and the relay function is normal, by changing the setting of the slave unit as a relay dedicated slave unit, a screen with no image or a sandstorm /
It is possible to prevent an abnormal image such as a black screen from being displayed. Also, replace the TV camera 6 with a normal one,
The video can be displayed again by restoring the setting.

As described above, according to this embodiment, when the slave units are automatically switched, the display of the relay-dedicated slave unit to which the television camera 6 is not connected is skipped, so that a screen with no image or a sandstorm / black screen is displayed. It is possible to prevent the display of abnormal images such as. In addition, during manual switching, switching to the relay-dedicated slave unit to which the TV camera 6 is not connected is not possible, and in this case too, an abnormal image such as a screen with no image or a sandstorm / black screen is displayed. Can be prevented.

Also, since the registration information of each of the slave units 1 to 4 is centrally managed by the master unit 5, when the TV camera 6 connected to the slave unit fails, the slave unit is set as a relay dedicated slave unit. You can prevent abnormal images such as a screen with no image or a sandstorm / black screen by simply changing the.

Further, since the route information from the selected slave unit to the master unit 5 is displayed on the monitor 7 connected to the master unit 5, any one of the slave units on the route is damaged (fault, radio wave does not reach, etc.). ) Occurs and the image of the selected slave unit is not displayed, the route information displayed indicates whether the relay is being performed and, if so, which slave unit is being routed. You can check. Further, since at least the number of the child device in which the failure has occurred is displayed on the monitor 7, the failure can be dealt with quickly.

Further, by data transmission using radio,
Even when the frequency band of the transmission path is narrowed and the motion of the moving image is reduced, the route information displayed on the monitor 7 indicates that the moving image transmission rate is reduced due to relaying, or the moving image is not relayed ( It is possible to distinguish whether the communication rate is low but the communication failure is occurring although the number of relays is small.

[0057]

As described above, according to the present invention,
When switching between multiple slaves automatically or manually to display images, prohibiting selection of relay-only slaves prevents abnormal images such as screens without images or sandstorm / black screens from being displayed. The effect of being able to do, and when the TV camera is broken or the child device is broken, if the child device is set as a relay-only child device, an abnormal image such as a screen with no image or sandstorm / black screen is displayed. It is possible to provide a video data wireless transmission system having an effect of preventing the display of.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a video data wireless transmission system according to an embodiment of the present invention.

FIG. 2 is a diagram for explaining the operation of the parent device in the embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of a base unit according to the embodiment of the present invention.

FIG. 4 is a block diagram showing a configuration of a slave unit according to the embodiment of the present invention.

FIG. 5 is a sequence diagram for explaining the operation of the video data wireless transmission system according to the embodiment of the present invention.

FIG. 6 is a sequence diagram for explaining the operation of the video data wireless transmission system according to the embodiment of the present invention.

FIG. 7 is a sequence diagram for explaining an operation of the video data wireless transmission system according to the embodiment of the present invention.

[Explanation of symbols]

1 to 4 cordless handsets 5 base unit 6 TV camera 7 monitors 8 Dedicated controller 15a, 15b, 51a, 51b antenna 16,52 Wireless transceiver 17 Video input section 20 memory 21, 57 Setting contents holding section 23, 59 Central control unit 53 Video output section

Continued front page    (72) Inventor Takayuki Shimaoka             3-1, Tsunashima-Higashi 4-chome, Kohoku-ku, Yokohama-shi, Kanagawa             Matsushita Communication Industry Co., Ltd. (72) Inventor Yoshihiro Hide             3-1, Tsunashima-Higashi 4-chome, Kohoku-ku, Yokohama-shi, Kanagawa             Matsushita Communication Industry Co., Ltd. (72) Inventor Masami Hishita             3-1, Tsunashima-Higashi 4-chome, Kohoku-ku, Yokohama-shi, Kanagawa             Matsushita Communication Industry Co., Ltd. F-term (reference) 5C054 AA01 DA07 EA03 FA00 FE02                       FE16 FE21 FF03 HA18                 5C056 FA01 FA05 GA11 HA04                 5K067 AA21 BB04 BB21 DD11 DD51                       EE02 EE06 EE10 FF02 FF23                       HH22                 5K072 AA25 AA26 AA28 BB04 BB14                       BB16 BB20 BB25 CC31 DD16                       DD17 DD19 EE04 FF18 HH03                       HH04 HH05 HH06

Claims (3)

[Claims] 1. A plurality of slave units, a master unit for controlling each of the plurality of slave units, and display means connected to the master unit, wherein the master unit among the plurality of slave units is In a video data wireless transmission system in which video data is wirelessly transmitted from the selected child device to the parent device and is displayed on the display means, each of the plurality of child devices is from another child device to the parent device. A relay unit for relaying the video data when transmitting the video data is provided, and the master unit is a selection for prohibiting selection of a relay dedicated slave unit for relaying the video data among the plurality of slave units. A video data wireless transmission system having a prohibition means. 2. A plurality of slave units, a master unit controlling each of the plurality of slave units, and a display unit connected to the master unit, the master unit among the plurality of slave units. In a video data wireless transmission system in which video data is wirelessly transmitted from the selected child device to the parent device and is displayed on the display means, each of the plurality of child devices is from another child device to the parent device. A relay unit for relaying the video data when transmitting the video data, wherein the master unit sets a route from the slave unit selected by the master unit among the plurality of slave units to the master unit A video data wireless transmission system comprising: route setting means for controlling the route information; and route information display control means for performing control for displaying route information indicating the route on the display means. 3. When a fault occurs in any of the slave units on the route from the slave unit selected by the master unit to the master unit, the master unit detects the faulty slave unit and at least detects this fault. 3. The video data wireless transmission system according to claim 2, further comprising a faulty slave unit information display control unit that performs control for displaying information indicating the slave unit on the display unit.