JP2023032140A - Data transmission unit, radio transmission apparatus, and transmission system - Google Patents

Abstract

To provide a data transmission unit capable of improving convenience by notifying a host and a video data storage display device of a receiver in advance about suspension or restart of data transmission from a radio circuit unit while preventing increase in device cost or size of a substrate, and provide a radio transmission apparatus, and a transmission system.SOLUTION: A data transmission unit includes a DFP/source 400 as a host, a UFP/sink 401 as a subordinate, and one USB cable 406 compatible with USB PD connecting the devices. The DFP/source 400 transmits specific data, such as video data, input from the host device to the UFP/sink 401. The UFP/sink 401 transmits control information on electric power required in the subordinate device to the host to give notice of fluctuation generated in the subordinate device. A radio transmission apparatus notifies a video data storage display device about suspension of transmission on the basis of the information.SELECTED DRAWING: Figure 5

Description

The present invention relates to a data transmission unit that transmits video data, and in particular, data transmission that can notify a video data receiving device in advance of stopping or resuming video reception, improves convenience, and enables stable operation. part, a wireless transmission device and a transmission system.

[Description of prior art: FIG. 6]
A general video transmission system will be described with reference to FIG. FIG. 6 is an explanatory diagram showing a schematic configuration of a conventional video transmission system.
As shown in FIG. 6, the video transmission system includes a conventional video shooting and transmitting device 10', a private wireless communication network 40, a wireless network 30, and a video data storage and display device 20. 10 ′ is transmitted to the video data storage display device 20 .

The image capturing and transmitting device 10' captures images and transmits image data by wireless communication.
The private wireless communication network 40 is a 5G (fifth generation mobile communication system) wireless communication network. The resolution of the image capturing unit 101 has improved to HD (High Definition) and 4K, and a bandwidth of about 15 Mbps for upstream and about 7 Mbps for downstream is required. Downlink 500 Mbps) Local 5G is used.

The wireless network 30 includes a wireless transmitting/receiving unit and a packet processing unit, and performs wireless communication with the image capturing/transmitting device 1' and also communicates with the video data storage/display device 20 via a cable.
The video data storage and display device 20 receives and stores the transmitted video data and displays it on the display unit.

[Construction of conventional video recording and transmission device: FIG. 7]
The configuration of a conventional image capturing/transmitting apparatus 10' will be described with reference to FIG. FIG. 7 is an explanatory diagram showing the configuration of a conventional video photographing and transmitting apparatus 10'.
As shown in FIG. 7, a conventional video photographing and transmitting apparatus 10' is composed of a host device 10'a and a subordinate device 10'b.
The host device 10'a includes an image capturing section 101, a power supply section 102, an operation section 103, and a control section 104. Each section of the host device 10'a is connected by an internal bus 100. FIG.
The host device 10'a also includes a host side configuration (host device) of the data transmission unit 107, which will be described later.

The subordinate device 10'b includes a temperature detection section 105, a radio circuit section 106, an antenna 109, and a power generation section 110. Each section of the subordinate device 10'b (on the device side) is connected by an internal bus 108. ing.
The lower device 10'b also includes a lower side configuration (lower device) of the data transmission unit 107. FIG.
The data transmission unit 107 connects the upper bus 100 and the lower bus 108 .

The configuration of the host device 10'a will be described.
The image capturing unit 101 is, for example, a surveillance camera, captures an image, converts the image into an electric signal, and transmits the image data to the data transmission unit 107 .
The power supply unit 102 receives power of AC 100V from the outside and supplies necessary power to the image capturing and transmitting apparatus 10 ′ via the internal bus 100 .

The operation unit 103 sets the resolution and the like of the image capturing unit. Resolutions include, for example, HD and 4K.
The control unit 104 performs processing such as contour correction of the video data converted into the electric signal, and subject recognition, such as adjustment of the shooting direction, focus, and light amount of the video shooting unit 101 .

The lower device 10'b constitutes a wireless device, and the radio circuit unit 106 receives video data transmitted from the higher device 10'a via the data transmission unit 107 and transmits the data via the antenna 109. Send to radio 40 .
Also, the high-frequency signal received by the antenna 109 is down-converted and output to the host device 10'a via the data transmission section 107. FIG.

The power generation unit 110 receives power from the power supply unit 102 via the data transmission unit 10 and generates power to be supplied to the temperature detection unit 105 and the wireless circuit unit 106 on the device side.
The temperature detection unit 105 detects the temperature of the radio circuit unit 106, and if the temperature exceeds the reference, notifies the data transmission unit 107 of the fact, and also sends the power generation unit 110 to the radio circuit unit 106. outputs an instruction to stop power supply to the
In other words, the radio circuit section 106 stops the transmission/reception operation when the temperature exceeds the standard.

[Configuration of conventional data transmission unit: FIG. 8]
Next, the configuration of the conventional data transmission unit 107 used in the conventional video photographing and transmitting apparatus shown in FIG. 7 will be described with reference to FIG. FIG. 8 is an explanatory diagram showing the configuration of a conventional data transmission unit 108. As shown in FIG.
As shown in FIG. 8, the conventional data transmission unit 107 uses a USB cable 206 conforming to USB2.0 or USB3.0.
In the USB2.0 or USB3.0 interface, the host 200 is the side that implements the parent functions of power supply and data communication, and the device 201 is the side that implements the child functions.

The host 200 has a USB data transmission/reception unit 202 and is connected to the bus 100 shown in FIG.
The device 201 has a USB data transmission/reception unit 203 and is connected to the bus 108 .
The data transmission/reception units 202 and 203 transmit and receive data via the USB cable 206 .

Here, the power that can be supplied to the USB cable 26 is 2.5 W with a rated voltage of 5 V and a maximum of 500 mA for USB 2.0, and 4.5 W with a rated voltage of 5 V and a maximum of 900 mA for USB 3.0. stipulated.
When local 5G is used as the private wireless system, the power in the wireless circuit unit 106 becomes larger than when LTE (Long Term Evolution) is used, and the peak power becomes 15W.
Therefore, in addition to the USB cable 206 for data transmission, at least two lines, a power line and GND, are required as the power supply line 204 .

In addition, when the temperature detection unit 105 detects the temperature rise of the wireless circuit unit 106 and notifies it to the host side, at least a signal line and GND are required as the contact signal line 205 in addition to the USB cable 206. .
In other words, the conventional data transmission unit 107 requires the power supply line 204 and the contact signal line 205 in addition to the USB cable 206 for data transmission, thus requiring three types of cables and connectors.

Furthermore, in order to suppress an increase in the size of the apparatus, if the temperature detection unit 105 detects a temperature rise in the wireless circuit unit 106 but does not notify the host side, the contact signal line is not required, but the wireless When the operation of the circuit section 106 stops without warning, the image on the video data storage display device 20 on the receiving side suddenly stops, and the receiving side cannot understand the cause and has to deal with it.

[Related technology]
Incidentally, as a conventional technology related to transmission of video data, there is Japanese Unexamined Patent Application Publication No. 2009-100246 entitled "Display Device" (Patent Document 1).
Patent Literature 1 describes acquisition of image information from an external device such as a mobile phone connected to a display device by transmitting an image acquisition request at predetermined intervals to the external device.

JP 2009-100246 A

As described above, conventional data transmission units use USB 2.0 or USB 3.0, so power supply lines and contact signal lines are required in addition to data transmission cables, which increases device costs and reduces substrate costs. However, there is a problem that it causes an increase in size.

Further, in the conventional image capturing and transmitting apparatus, even if the temperature detection unit 105 detects a temperature rise in the wireless circuit unit 106, if the host is not notified, the operation of the wireless circuit unit 106 stops without warning. As a result, the image on the image data storage display device on the receiving side suddenly stops, and the cause is unknown, so there is a problem that it is difficult to deal with it.

In addition, in Patent Document 1, a host device, a lower device, and a single cable connecting the host device and the lower device are provided, and the lower device transmits control information related to power required by the lower device to the higher device. A data transmission unit for transmitting and notifying fluctuations occurring in the subordinate device is not described.

The present invention has been made in view of the above-mentioned actual situation. It is an object of the present invention to provide a data transmission unit, a wireless transmission device, and a transmission system capable of notifying a display device and improving convenience.

The present invention for solving the problems of the above conventional example is a data transmission section for transmitting specific data, comprising a host machine, a lower machine, and a single cable connecting the two. The device transmits specific data input from the upper device to the lower device, and the lower device transmits control information regarding power to the higher device to inform the fluctuation occurring on the side of the lower device.

Further, according to the present invention, there is provided a radio transmission apparatus comprising the above data transmission section, wherein the host device including the host device is provided with a control section for controlling transmission of specific data, and the lower device including the lower device is provided with a specific data a wireless circuit unit for wirelessly transmitting data; and a temperature detection unit for detecting the temperature of the lower-level device, wherein the temperature detection unit outputs an instruction to stop power supply to the wireless circuit unit according to temperature conditions, The low-order device is characterized in that it monitors the temperature information from the temperature detection unit and notifies the control unit on the high-order side that the power supply to the wireless circuit unit is stopped.

Further, in the wireless transmission device of the present invention, the control unit of the host device receives notification from the lower device that power supply to the wireless circuit unit is stopped, and notifies a specific data transmission destination of the stop. It is characterized by

Further, according to the present invention, in the wireless transmission device described above, the specific data is image data, and the controller of the higher-level device connects the image data while the power supply to the wireless circuit is stopped. , and the stored image data is transmitted after the power supply to the wireless circuit unit is restarted.

The present invention also provides a transmission system comprising any one of the wireless transmission devices described above and an image processing device as a destination of wirelessly transmitted data, wherein the wireless circuit unit transmits specific data in 5G. It is characterized by wireless transmission.

According to the present invention, the data transmission unit for transmitting specific data comprises a higher-level machine, a lower-level machine, and a single cable connecting the two. Data is transmitted to the lower-level machine, and the lower-level machine transmits control information related to power to the higher-level machine to notify fluctuations occurring on the lower-level machine side. The operation state of the lower side can be grasped based on the state of the power required in the lower side, and there is an effect that it is possible to recognize in advance that the operation of components that consume a large amount of power, such as the radio circuit section, will stop or restart.

According to the present invention, there is provided a radio transmission apparatus comprising the above data transmission unit, wherein a higher-level device including a higher-level device includes a control unit for controlling transmission of specific data, and a lower-level device including a lower-level device includes A radio circuit unit that wirelessly transmits specific data and a temperature detection unit that detects the temperature of the lower side, and the temperature detection unit outputs an instruction to stop power supply to the radio circuit unit according to the temperature condition. On the other hand, the low-order device monitors the temperature information from the temperature detection unit and is a wireless transmission device that notifies the control unit of the high-order device that the power supply to the wireless circuit unit is stopped. However, the control unit of the host device can grasp the operation state of the lower device based on the state of the power required in the lower device, and stop or restart the operation of components that consume a large amount of power, such as the radio circuit unit. It has a pre-recognizable effect.

Further, according to the present invention, the control unit of the higher-level device receives notification from the lower-level device that power supply to the wireless circuit unit is stopped, and notifies a specific data transmission destination of the stop. Therefore, the destination can recognize in advance that the transmission of specific data will be stopped, and there is an effect that the convenience of system operation can be improved.

Further, according to the present invention, the specific data is image data, and the control unit of the host device stores the image data in the connected storage unit while the power supply to the wireless circuit unit is stopped. Since the wireless transmission device transmits the stored image data after the power supply to the wireless circuit unit is restarted, the image data during the period when the transmission operation of the wireless circuit unit is stopped can be reliably sent to the transmission destination. It has a transmittable effect.

1 is a configuration block diagram of a video shooting and transmitting device (this video shooting and transmitting device) according to an embodiment of the present invention; FIG. FIG. 4 is an explanatory diagram showing the configuration of the data transmission unit; FIG. 4 is an explanatory diagram showing the configuration of a USB PD control unit; 4 is an explanatory diagram showing messages transmitted and received between a DFP/source 400 and a UFP/sink 401; FIG. FIG. 4 is an explanatory diagram showing a sequence in the data transmission unit 307; 1 is an explanatory diagram showing a schematic configuration of a video transmission system; FIG. FIG. 2 is an explanatory diagram showing the configuration of a conventional video shooting and transmission device 10'; FIG. 4 is an explanatory diagram showing the configuration of a conventional data transmission unit 108;

An embodiment of the present invention will be described with reference to the drawings.
[Outline of Embodiment]
A data transmission unit (this data transmission unit) according to an embodiment of the present invention includes a higher-level device, a lower-level device, and one cable connecting the higher-level device and the lower-level device. Specific data such as input video data is transmitted to the subordinate device, and the subordinate device transmits control information related to the power required by the subordinate device to the superior device to inform fluctuations occurring in the subordinate device. Therefore, without using multiple types of cables, the upper device can grasp the operating state of the lower device based on the state of the power required in the lower device, and the operation of components with large power consumption, such as the wireless circuit unit, can be stopped or stopped. Resumption can be recognized in advance.

Further, a radio transmission apparatus according to an embodiment of the present invention (the present radio transmission apparatus) includes the above-described data transmission unit, a radio circuit unit for wirelessly transmitting data to a lower apparatus including a lower apparatus, and a radio circuit unit. a temperature detection unit for detecting temperature, the temperature detection unit outputs an instruction to stop power supply to the wireless circuit unit according to temperature conditions, and the lower-level device monitors temperature information from the temperature detection unit. Then, the control unit of the host device including the host device is notified that the power supply to the radio circuit unit is stopped, and the control unit notifies the data transmission destination of the stop. While preventing the increase and the size of the substrate, the control unit can recognize that before the wireless circuit unit stops or restarts the operation, and can notify the data transmission destination. Since the stop or restart of data can be recognized immediately, there is no need to take any special measures, which improves convenience and enables stable operation.

A transmission system according to an embodiment of the present invention (this transmission system) is a transmission system including this wireless transmission device.

[Structure of Video Shooting and Transmission Apparatus According to Embodiment: FIG. 1]
FIG. 1 is a configuration block diagram of a video shooting and transmitting device (this video shooting and transmitting device) according to an embodiment of the present invention.
This image capturing and transmission device is used in the transmission system shown in FIG. 6, and corresponds to the wireless transmission device described in the claims.
Also, the present image capturing and transmitting apparatus transmits image data as specific data described in the claims. In this embodiment, a video shooting transmission device is described as an example of a wireless transmission device.

As shown in FIG. 1, the video photographing and transmitting apparatus 10 has a basic configuration similar to that of the conventional video photographing and transmitting apparatus 10' shown in FIG. .
As parts similar to those of the conventional image capturing and transmitting apparatus 10', the image capturing unit 301 of the host device 10a, the power supply unit 302, the operation unit 303, the bus 300, the temperature detection unit 305 of the lower device 10b, and the wireless It comprises a circuit section 306, a power generation section 310, and a bus 308, and features a control section 304, a storage section 311, and a data transmission section 307 of the higher-level device 10a. there is
Incidentally, as will be described later, the host device, which is the configuration on the upper side of the data transmission unit 307, is included in the host device 10a, and the lower device, which is the configuration on the lower side, is included in the lower device 10b.
A detailed description of the same parts as those of the conventional image capturing and transmitting apparatus 10' will be omitted.

The operation of the control unit 304 is partially different from that of the control unit 104 provided in the conventional image capturing and transmitting apparatus 10'.
Also, the data transmission section 307 differs from the conventional data transmission section 307 in configuration and operation.
The storage unit 311 accumulates video data captured while the wireless circuit unit 306 is stopped, as will be described later.

[Configuration of this data transmission unit: Fig. 2]
The configuration of the data transmission unit 307, which is a characteristic part of the image capturing and transmitting apparatus 10, will be described with reference to FIG. FIG. 2 is an explanatory diagram showing the configuration of this data transmission unit.
First, as a feature of the data transmission unit 307, the USB cable 406 uses a USB Type-C cable conforming to USB PD (USB Power Delivery). The USB cable 406 enables video data transmission, power supply, contact signals, and various messages to be transmitted with a single cable.

Conventionally, three types of cables and connectors were required for video data transmission, power supply, and contact signal transmission. It is possible to reduce the equipment cost and scale.

As shown in FIG. 2, the data transmission unit 307 has a DFP (Downstream Facing Port) as a data transmission host on the upper side connected by a USB cable 406, and a UFP as a data transmission slave on the lower side. (Upstream Facing Port), a source that supplies power on the upper side, and a sink that receives power on the lower side.

The DFT and the source on the host side are integrally provided to form a DFP/source (host device) 400 . The DFP/source 400 corresponds to a higher-level machine described in the claims.
A UFP and a sink on the lower side are also integrally provided to constitute a UFP/sink (lower machine) 401 . The UFP/sink 401 corresponds to a lower-level machine described in the claims.
Also, the DFP/source 400 is connected to the bus 300 shown in FIG. 1, and the UFP/sink 401 is connected to the bus 308 .

The DFP/source 400 has a USB PD control section 402 and a USB data transmission/reception section 403 . Similarly, the UFP/sink 401 has a USB PD control section 404 and a USB data transmission/reception section 405 .

USB PD controller 402 and USB PD controller 404 transmit and receive power-related messages. Messages related to power are described later.
For example, the USB PD control unit 404 of the UFP/sink 401 detects the voltage and current necessary for the lower device 10b connected to the UFP/sink 401 based on the temperature information from the temperature detection unit 305. The USB PD control unit 402 is notified.

USB data transmitting/receiving unit 403 and USB data transmitting/receiving unit 405 transmit and receive video data. In addition to transmitting and receiving video data, as a feature of this data transmission unit 307, the video data storage display, which is the transmission destination of video data from control unit 304 of host device 10a, is performed. Data for notifying that the transmission operation of the radio circuit unit 306 is to be stopped and data for notifying that the transmission operation is to be restarted are transmitted to the device 20 .

[Configuration of USB PD control unit: Fig. 3]
The configuration of USB PD control units 402 and 404 will be described with reference to FIG. FIG. 3 is an explanatory diagram showing the configuration of the USB PD control unit.
As shown in FIG. 3, USB PD control units 402 and 404 include a CPU (Central Processing Unit) 501, a volatile memory 502, a nonvolatile memory 503, a power monitoring unit 504, a general-purpose input/output terminal 505, and an ADC ( Analog Digital Converter) 506 and PD communication PHY 507 .

The CPU 501 activates a program stored in the nonvolatile memory 503 and controls the entire USB PD control section 402 .
The nonvolatile memory 503 stores programs executed by the CPU 501 .
The volatile memory 501 operates as a main memory, expands programs, and holds data.

The USB PD control unit 402 and the USB PD control unit 404 have the same configuration, but the programs stored in the nonvolatile memory 503 are different, or among the stored programs, the programs that are activated according to the settings are different. Therefore, it behaves differently.
That is, the USB PD control unit 402 implements the DFP/source function, and the USB PD control unit 404 implements the UFP/sink function.

The power monitoring unit 504 operates differently in the DFP/source 400 and the UFP/sink 401. In the USB PD control unit 402 of the DFP/source 400, the power monitoring unit 504 receives power from the power supply unit 302 shown in FIG. monitor for overvoltage and overcurrent conditions.
In the USB PD control unit 404 of the UFP/sink 401, the power monitoring unit 504 monitors overvoltage and overcurrent with respect to the power to the power generation unit 310 in FIG.

The general-purpose input/output terminal 505 performs external input/output, and outputs changes in the state of the signal of the external terminal to the CPU 301 via the internal bus 500 .
ADC 506 converts analog signals to digital data, and converts analog signals, such as external temperature changes, to digital data.
The CPU 501 can detect signals and temperature information from external terminals via the bus 500 .
The PD communication PHY 507 is connected to the CC1 and CC2 signal lines of the USB cable 406 and performs signal transmission between the USB PD control unit 402 and the USB PD control unit 404 .

[Outline of operation of this data transmission unit and this video shooting transmission device: Figures 1 to 3]
Here, an outline of the operations of the data transmission unit 307 and the image capturing and transmitting apparatus 10 will be described with reference to FIGS. 1 to 3. FIG.
In the image capturing and transmitting apparatus 10, similarly to the conventional image capturing and transmitting apparatus 10', the temperature detection section 305 detects the temperature of the wireless circuit section 306, outputs the temperature information to the data transmission section 307, and outputs the detected temperature information to the data transmission section 307. If the obtained temperature information is higher than the reference, it outputs an instruction to the power generation section 310 to stop the power supply to the radio circuit section 306 .

In the data transmission unit 307 of the video shooting transmission device 10, the USB PD control unit 404 of the UFP/sink 401 monitors the temperature information from the temperature detection unit 305, and if it is higher than the set value, the lower device 10b The USB PD control unit 402 of the DFP/source 400 is notified that the power to be used is greatly reduced. This notification is transmitted before the radio circuit section 306 actually stops.
The data transmission unit 307 exchanges information about this power using a specific message as will be described later.

When the USB PD control unit 402 of the DFP/source 400 receives the fact that the required power in the lower device 10b will decrease, it outputs it to the control unit 304 of the higher device 10a, and the control unit 304 determines that the radio circuit unit 306 will stop. Then, the video data storage/display device 20, which is the transmission destination of the video data, is notified that the transmission of the video data is stopped.

As a result, the image data storage/display device 20 side recognizes that the image data will stop before the wireless circuit unit 306 stops transmission operation due to the temperature rise, and for example displays that fact on the display screen. The operator should be able to respond calmly.

[Messages between DFP/Source 400 and UFP/Sink 401: FIG. 4]
Next, messages regarding power information exchanged between the DFP/source 400 and the UFP/sink 401 of the data transmission unit 307 will be described with reference to FIG. FIG. 4 is an explanatory diagram showing messages transmitted and received between the DFP/source 400 and the UFP/sink 401. As shown in FIG.
As shown in FIG. 4, USB PD messages include control messages and data messages.
A control message is a control message for flow management or a message that does not require data.
A data message is a message used to transfer data such as power information.

Source_Capabilities is a data message from source to sink that tells what kind of voltage and current the source can supply.
Request is a data message from the sink to the source, specifying the voltage and current required by the sink from the previously sent Source_Capabilities.

Sink_Capabilities is a data message from sink to source that tells the sink what voltage and current it needs. For example, when the radio circuit unit 308 is operating normally, the maximum values that can be set are notified as voltage and current. On the other hand, when the radio circuit unit 308 has reached a high temperature and will soon stop operating, both the current and the voltage are notified as "0".

Accept is a control message that is transmitted both from source to sink and from sink to source to indicate acceptance of a data message.
Reject is a control message that is sent both from the source and the sink and from the sink to the source to indicate that the data message will not be accepted.
PS_RDY is a source-to-sink control message that indicates when VBUS is powered on or off.

[Sequence in this data transmission unit: FIG. 5]
Next, the sequence in the main data transmission section 307 according to the temperature state of the radio circuit section 306 will be described with reference to FIG. FIG. 5 is an explanatory diagram showing the sequence in the data transmission section 307. As shown in FIG.
FIG. 5 mainly shows exchanges between the USB PD control unit 402 of the DFP/source 400 and the USB PD control unit 404 of the UFP/sink 401. , and other transmission information.

When the USB PD control unit 402 of the DFP/source 400 (hereinafter simply referred to as the DFP/source 400) receives the USB attach notification by connecting the USB cable 406 (S1), the USB PD control unit 404 of the UFP/sink 401 A Source Capabilities message is sent to the UFP/sink 401 (hereinafter simply referred to as the UFP/sink 401) to indicate the amount of power (type of voltage and current) that can be supplied from the host device 10a (S2).

The UFP/sink 401 receives the Source_Capabilities message, and transmits the power amount (type of voltage and current) required by the lower device 10b from among them to the DFP/source 400 by a Request message (S3).
Under normal conditions (when the temperature of the radio circuit unit 306 is normal), information indicating "maximum voltage and maximum current" is transmitted by a Request message.

Upon receiving the Request, the DFP/source 400 transmits an Accept message indicating acceptability (S4), further transmits a PS_RDY message (S5), and supplies power to the power generator 310 via the UFP/sink 401. supply is started (S6).

On the other hand, the temperature detection unit 305 detects the temperature of the wireless circuit unit 306 and outputs temperature information to the UFP/sink 401 .
Then, UFP/sink 401 compares a preset threshold value with the temperature from temperature detection unit 305, and when it determines that the temperature of wireless circuit unit 306 has risen (S10), UFP/sink 401 A Sink_Capabilities message is sent to the DFP/source 400 to notify that there has been a change in the amount of power required (S11).

Specifically, the UFP/sink 401 transmits a Sink_Capabilities message indicating "voltage 0, current 0" because the required amount of power becomes extremely small when the radio circuit unit 306 stops. That is, the message indicates that the wireless circuit unit 306 will soon stop working.

Before the temperature detection unit 305 instructs the power generation unit 310 to stop supplying power to the radio circuit unit 306, the UFP/sink 401 notifies the DFP that the radio circuit unit 306 will stop soon. / source 400 , the threshold for temperature information in UFP/sink 401 is set to a temperature lower than the reference for instructing to stop the power supply in temperature detector 305 .

Also, if the temperature information momentarily exceeds the threshold due to a sudden error, etc., the message will not be sent immediately. I have to.

Then, when the DFP/source 400 receives the Sink_Capabilities message indicating "voltage 0, current 0", it transmits an Accept message (S12) and transmits specific information indicating that the radio circuit unit 306 is stopped. is output to the control unit 304 of the host device 10a shown in FIG.

When the control unit 304 receives the information indicating that the radio circuit unit 306 is to be stopped, the control unit 304 transmits information (video transmission stop message) that notifies the video data storage/display device 20 of the stoppage of the radio circuit unit 304 in advance ( S13).
The video transmission stop message is transmitted as a separate system from the power control message.
Then, according to an instruction from the temperature detection unit 305, the power generation unit 310 stops supplying power to the radio circuit unit 306, and the radio circuit unit 306 stops operating (S14).

The temperature detection unit 305 continues to detect the temperature even after the radio circuit unit 306 stops operating, and the UFP/sink 401 detects the temperature of the radio circuit unit 306 by comparing the temperature information with a threshold value. It outputs temperature information to the DFP/source 400 .
Then, when the temperature of the radio circuit unit 306 becomes equal to or lower than the reference value, the temperature detection unit 305 outputs an instruction to start supplying power to the radio circuit unit 306 to the power generation unit 310 .

UFP/sink 401 monitors the temperature information from temperature detection unit 305, and when it determines that the temperature information has fallen below the threshold value and the temperature of the wireless circuit unit has returned to normal (S20), UFP/sink 401 detects Sink_Capabilities. The message informs the DFP/source 400 that the required amount of power has changed (S21).

Specifically, since the radio circuit unit 306 resumes operation and power consumption increases, the UFP/sink 401 transmits a Sink_Capabilities message indicating "maximum voltage, maximum current". In other words, the message indicates that the radio circuit unit 306 will resume transmission and reception operations soon.

Then, when the DFP/source 400 receives the Sink_Capabilities message indicating "maximum voltage and maximum current", it transmits an Accept message (S22), and transmits specific information indicating that the radio circuit unit 306 will resume operation. It outputs to the control unit 304 of the device 10a.

When the control unit 304 receives the information indicating that the operation of the radio circuit unit 306 is to be restarted, the control unit 304 transmits information (video transmission restart message) to the video data storage device 20 in advance to notify the operation of the radio circuit unit 306 to be restarted. Send (S23).
In this manner, the operations of the data transmission section and the video imaging transmission apparatus are performed.

Note that video data shot while the radio circuit unit 306 is not operating is stored in the storage unit 311, and when the temperature of the radio circuit unit 306 returns to normal and power supply is resumed, operation is resumed. You may make it transmit after restarting.
When storing the data in the storage unit 311, it is conceivable to reduce the amount of data by appropriately thinning out the video data and storing the data, or by storing the video data at a reduced resolution.

[Effects of Embodiment]
According to this data transmission unit, a DFP/source 400 as a higher-level device, a UFP/sink 401 as a lower-level device, and a single USB cable 406 compliant with USB PD for connecting them are provided. 400 transmits specific data such as video data input from the host device 10a on the upper side to the UFP/sink 401, and the UFP/sink 401 transmits control information regarding power required by the lower device 10b on the lower side to the host device. 10a to notify the fluctuations occurring in the lower device 10b, the higher device 10a does not increase the device cost, and the upper device 10a determines whether the power of the lower device 10b is necessary based on the state of power required in the lower device 10b. There is an effect that it is possible to grasp the operation state and recognize in advance that the operation of a component that consumes a large amount of power, such as the wireless circuit unit 306, will be stopped or restarted.

Further, according to this image capturing and transmitting apparatus, the wireless circuit unit 306 includes the data transmission unit described above, and wirelessly transmits data to the lower device 10b connected to the UFP/sink 401, which is a lower device. The temperature detection unit 305 outputs an instruction to stop the power supply to the wireless circuit unit 306 according to the temperature condition, and the UFP/sink 401 detects the temperature from the temperature detection unit 305. It monitors the temperature information and notifies the control unit 304 of the high-level device 10a connected to the high-level device DFP/source 400 that the power supply to the radio circuit unit 306 is stopped. Since the image capturing and transmitting apparatus notifies the image data storage and display apparatus 20, which is the transmission destination of the image data, of the stop, the control unit 304 can restart the operation before the wireless circuit unit 306 stops without increasing the apparatus cost. The video data storage and display device 20 can be notified of this fact before it is done, and the video data storage and display device 20 can recognize the stop or restart of data in advance, so there is no need to take special measures. This has the effect of improving the convenience of system operation and enabling stable operation.

In the above example, the configuration for notifying the video data storage and display device 20 of the operation stop due to the detection of an abnormality due to the temperature rise of the wireless circuit unit 306 has been described. , abnormality of the power generation unit 310), and the USB PD control unit 404 configures the program so as to transmit a message to the DFP/source 400 when the abnormality is detected. The state can be easily notified to the host control unit 304, and can be notified to the video data storage and display device 20 in the same manner as in the case of temperature rise, thereby improving convenience.

INDUSTRIAL APPLICABILITY The present invention is suitable for a data transmission unit, a wireless transmission device, and a transmission system that can notify a video data receiving device in advance of stopping or resuming video reception, improve convenience, and enable stable operation. .

DESCRIPTION OF SYMBOLS 10, 10'... video photography transmission device 10a, 10'a... host device 10b, 10'b... sub device 20... video data storage display device 30... wireless network 101, 301... video shooting unit 102 , 302... Power supply unit 103, 303... Operation unit 104, 304... Control unit 105, 305... Temperature detection unit 106, 306... Wireless circuit unit 107, 307... Data transmission unit 110, 310... Power Generation unit 200 Host 201 Device 311 Storage unit 400 DFP/source 401 UFP/sink 402, 404 USB PD control unit 202, 203, 403, 405 USB data transmission/reception unit, 204... Power supply line 205... Contact signal line 206, 406... USB cable 300, 308, 500... Bus 501... CPU 502... Volatile memory 503... Non-volatile memory 504... Power monitoring unit 505... General purpose Input/output terminals 506 ADC 507 PD communication PHY

Claims (5)

A data transmission unit that transmits specific data,
Equipped with a higher machine, a lower machine, and a single cable connecting the two,
the upper machine transmits the specific data input from the upper machine to the lower machine;
A data transmission unit, wherein the lower device transmits control information on power to the higher device to inform the fluctuation occurring in the lower device. A wireless transmission device comprising the data transmission unit according to claim 1,
The host device including the host device has a control unit that controls the transmission of specific data,
A lower-level device including a lower-level device includes a wireless circuit unit for wirelessly transmitting the specific data and a temperature detection unit for detecting the temperature of the lower-level device,
The temperature detection unit outputs an instruction to stop power supply to the wireless circuit unit according to temperature conditions,
The wireless transmission device, wherein the lower device monitors temperature information from the temperature detection unit and notifies a control unit of the higher device that power supply to the wireless circuit unit is stopped. 3. The wireless transmission according to claim 2, wherein the control unit of the higher-level device receives notification from the lower-level device that power supply to the wireless circuit unit is stopped, and notifies a specific data transmission destination of the stop. Device. The specific data is image data,
The control unit of the host device stores the image data in the connected storage unit while the power supply to the wireless circuit unit is stopped, and stores the image data after the power supply to the wireless circuit unit is resumed. 4. The wireless transmission device according to claim 2, wherein image data is transmitted. A wireless transmission device according to any one of claims 2 to 4, and an image processing device as a transmission destination of wirelessly transmitted data,
The transmission system, wherein the wireless circuit unit wirelessly transmits specific data in 5G.

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