CN1549145A - Universal serial bus concentrator for wireless transmission and wireless transmitting method thereof - Google Patents
Universal serial bus concentrator for wireless transmission and wireless transmitting method thereof Download PDFInfo
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- CN1549145A CN1549145A CNA03136201XA CN03136201A CN1549145A CN 1549145 A CN1549145 A CN 1549145A CN A03136201X A CNA03136201X A CN A03136201XA CN 03136201 A CN03136201 A CN 03136201A CN 1549145 A CN1549145 A CN 1549145A
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Abstract
The USB concentrator includes one USB logic concentrator and one remote concentrator. The USB logic concentrator has at least one upwards transmission port connected to one USB host computer or one USB concentrator to receive and transmit control command from USB host computer. The remote concentrator has several downwards ports and each of the downwards ports is connected to USB peripheral or one other USB concentrator to detect the connection state of the downwards port and collect relevant information from USB peripheral. In addition, each of the USB logic concentrator and the remote concentrator has also one RF data module for communication in radio transmission mode and mutual data transmission between USB host computer and USB peripheral.
Description
Technical field
The invention relates to a kind of universal serial bus concentrator and transmission method thereof, especially in regard to a kind of universal serial bus concentrator and radio transmitting method thereof of wireless transmission.
Background technology
(Universal Serial Bus USB) is the complicated problem that is faced in installation and expansion with computer system and interfacing equipment at, a kind of new bus interface that is proposed to USB (universal serial bus).Under this system, all peripheral units all can pass through same interface, also promptly a usb bus and main frame are linked up, and its characteristic is, all USB peripheral units all have the function that " hot plug (hot plug) " reaches " plug and play (plug and play) ", also, and when installing or removing this type of device, the main frame of neither need shutting down computer does not in advance need install driver separately yet again.
According to the USB specification, each USB system also is that usb host (Host), USB connecting interface (Inter-connection) and USB device (Device) constitute mainly by three assemblies.In each USB system, have only a usb host, and be made in a main frame inside usually.The kind of USB device has then comprised USB peripherals and usb hub (Hub).USB peripherals is aforesaid computer interface equipment, for example: keyboard, mouse and printer or the like, each USB peripherals is connected to a usb host by a USB connecting interface; Usb hub then can be extended for single connectivity port a plurality of, makes a plurality of USB peripherals be able to by this hub usb bus in the connection.
Please refer to Fig. 1, is the connected mode synoptic diagram of USB system shown in the figure.By among the figure as can be known, the mode of connection that a USB system is extended downwards by a usb host 100 beginning has a starlike hierarchical structure.The Root Hub 101 (Root Hub) that is positioned at usb host 100 bottoms has two connectivity ports 102,103, in order to connect USB peripherals 105 or usb hub 104.Each usb hub 104 can provide a plurality of connectivity ports, and to connect a plurality of USB peripherals 105, perhaps, this usb hub 104 also can connect one or above usb hub 106 again, so that more a plurality of USB peripherals 107 is connected this bus.Mode according to this, a usb host can be connected to 127 USB peripherals at most.
Though use the USB interface transmission to have above-mentioned advantage, still exist following restriction and shortcoming.According to the USB specification, between usb host 100 and the USB peripherals, comprise Root Hub 101 interior, at most can only by five usb hubs (as Fig. 1 indicate 101,104,106,108,110) connected, simultaneously the cable that connects of each device 120 is the longest can not surpass 5 meters, specification according to this, the usb host 100 and distance between the USB peripherals 111 can't be above 25 meters farthest, for relatively large office, 25 meters distance is some deficiency obviously.
In addition,, and usb hub is used as signal repeater (repeater) merely, then must pay higher cost, and the arbitrary link of each tie point gets loose and promptly can interrupt connecting if in order to prolong the distance between usb host and the USB peripherals; Simultaneously be connected usb host and USB peripherals with cable, also reduced the mobile convenience of portable usb host, as mobile computer (notebook) with usb hub.Therefore as how lower cost, breaking through between usb host and USB peripherals 25 meters distance limit, and can solve the inconvenience that wired connection usb host and USB peripherals are caused, is to demand the problem improved at present urgently.
Summary of the invention
At the problems referred to above, usb hub and the radio transmitting method thereof of purpose of the present invention for a kind of wireless transmission is provided, it can solve the specification limits of 25 meters of maximum distances between usb host and USB peripherals.
Usb hub and the radio transmitting method thereof of another object of the present invention for a kind of wireless transmission is provided, the one-tenth that it can be lower extended the distance between usb host and USB peripherals originally.
Usb hub and the radio transmitting method thereof of another purpose of the present invention for a kind of wireless transmission is provided, it can be exempted with usb hub and is connected the not attractive in appearance and inconvenience that usb host and USB peripherals are caused with cable.
Usb hub and the radio transmitting method thereof of a further object of the present invention for a kind of wireless transmission is provided, its can make do not have the wireless transmission interface USB peripherals and usb host wireless connections and transmit data.
For reaching above-mentioned purpose, the usb hub of wireless transmission of the present invention comprises: a USB logic concentrator and a remote concentrator.The USB logic concentrator has at least one upwards transmission port and is connected with a usb host or a usb hub, to receive and to send the steering order from usb host.Remote concentrator has a plurality of ports that pass down, and passing port under each can be connected with a USB peripherals or another usb hub, and detects the connection status of each time biography port and the relevant information of collecting USB peripherals.USB logic concentrator and remote concentrator respectively have a rf data assembly in addition, allow USB logic concentrator and the remote concentrator can be with the mutual communication of Wireless transmission mode, and then make usb host and the USB peripherals can mutual data transmission.
The radio transmitting method of wireless transmission usb hub of the present invention, at first, usb host is to send steering order and the communication of USB logic concentrator with the USB communications protocol, the USB logic concentrator is sent to remote concentrator with home control network communication protocol after with this steering order format transformation, remote concentrator receives and reduces steering order after the steering order, and carry out this steering order with USB communications protocol and the communication of USB peripherals, the response that USB peripherals produces then is back to usb host according to opposite program, makes usb host and USB peripherals can finish communication smoothly.
Because under the same conditions, wireless transmission distance depends on Radio Transmission Technology and power, therefore the wireless transmission distance between USB logic concentrator and remote concentrator is greater than more than 15 meters, promptly can solve the specification limits of 25 meters of maximum distances between usb host and USB peripherals with one group of wireless transmission usb hub of the present invention, and only need one group of wireless transmission usb hub can prolong distance between usb host and USB peripherals, therefore can prolong the distance of communication originally with lower one-tenth.In addition, the computer interface equipment that only has the USB transmission interface only needs to be connected with remote concentrator, can be with Wireless transmission mode and usb host communication, and do not need to have the computer interface equipment of wireless transmission interface, can have the convenience that wireless transmission is brought.
Description of drawings
Fig. 1 is a calcspar, shows the connected mode synoptic diagram of known USB system.
Fig. 2 A is a calcspar, shows the USB system connected mode synoptic diagram according to the wireless transmission usb hub of preferred embodiment of the present invention.
Fig. 2 B is a calcspar, shows another USB system connected mode synoptic diagram according to the wireless transmission usb hub of preferred embodiment of the present invention.
Fig. 3 is a calcspar, shows the composition structure according to the wireless transmission usb hub of preferred embodiment of the present invention.
Fig. 4 is a process flow diagram, shows the wireless transmission step according to the wireless transmission usb hub of preferred embodiment of the present invention.
Embodiment
Hereinafter with reference to correlative type, usb hub and radio transmitting method thereof according to the wireless transmission of preferred embodiment of the present invention are described, wherein identical assembly will be illustrated with identical reference marks.
Please refer to Fig. 2 A and 2B, is the USB system connected mode synoptic diagram according to the wireless transmission usb hub of preferred embodiment of the present invention shown in the figure.In embodiments of the present invention, the usb hub 200 of wireless transmission comprises a USB logic concentrator 201 and a remote concentrator 203.USB logic concentrator 201 has at least one upwards transmission port 202 and is connected (shown in Fig. 2 A) with the Root Hub 101 of usb host 100; Upwards transmission port 202 also can be connected (shown in Fig. 2 B) with usb hub 104 in the present embodiment, below usb host 100 and usb hub 104 is collectively referred to as epigyny device 301 (as shown in Figure 3).Shown in Fig. 2 A and 2B, remote concentrator 203 has a plurality of ports 204 that pass down, each passes port 204 down and can connect a USB peripherals 105 or connect a usb hub 108, below USB peripherals 105 and usb hub 108 are collectively referred to as USB device 302 (as shown in Figure 3), between USB logic concentrator 201 and the remote concentrator 203, with wireless transmission method 205 mutual communications, make epigyny device 301 can with USB device 302 mutual transmission information.Wireless transmission method 205 is known Radio Transmission Technology, for example blue bud (bluetooth) but the transmission range of Radio Transmission Technology is about 10 meters, if usb hub among Fig. 1 104,106,108 and 110 is replaced as the wireless transmission usb hub 200 of the embodiment of the invention, then usb host 100 and USB peripherals 105 maximum distances can be extended for totally 40 meters of 25 meters wireless transmission distances of adding 4 tool wireless transmission usb hubs 200 by known 25 meters, promptly always have 65 meters transmission range.
Then please refer to Fig. 3, the composition structure of the embodiment of the invention is described.USB logic concentrator 201 comprises a USB circuit 2011, the first communications protocol transition components 2012, first radio circuit 2013 and the first rf data assembly 2014.Remote concentrator 203 comprises the 2nd USB circuit 2031, the second communications protocol transition components 2032, second radio circuit 2033 and the second rf data assembly 2034.The one USB circuit 2011 is in order to the emulation usb hub, be connected with epigyny device 301,2031 emulation usb hubs of the 2nd USB circuit detect the connection status of USB device 302, if connect a USB device 302, then collect the relevant information (for example this device is speeder or low speed device) of USB device 302, and be returned to 2011 in a USB circuit 2011, the one USB circuit and represent USB device 302 and epigyny device 301 to carry out communication.
Wherein the communication of a USB circuit 2011 and the 2nd USB circuit 2031 is to carry out communication with Wireless transmission mode.The connection status that detects USB device 302 with the 2nd USB circuit 2031 is an example, data and USB device 302 communications of the 2nd USB circuit 2031 to meet USB communications protocol form, collect connection status and USB device 302 relevant informations, this USB formatted data converts the data that meet the radio-frequency communication protocol format to through the second communications protocol transition components 2032, with blue bud Radio Transmission Technology is example, these radio-frequency communication protocol format data are blue bud formatted data, after second radio circuit 2033 is handled, transfer to 2034 emissions of the second rf data assembly and broadcast away again.After the first rf data assembly 2014 receives these data, handle via first radio circuit 2013 again, transfer to the first communications protocol transition components 2012 and be reduced into the USB formatted data, be sent to epigyny device 301 via a USB circuit 2011 at last and can with usb host 100 communications.Opposite, usb host 100 sends a steering order, with USB formatted data and a USB circuit 2011 communications, be converted to blue bud form through the first communications protocol transition components 2012, again after first radio circuit 2013 is handled, transferring to 2014 emissions of the first rf data assembly broadcasts away, after the second rf data assembly 2034 receives, handle through second radio circuit 2033, be reduced into the USB formatted data through the second communications protocol transition components 2032 again, 2031 in the 2nd USB circuit is carried out this steering order and 302 communications of USB device.
In addition, the 2nd USB circuit 2031 more can be a plurality of USB transaction and arranges time-histories, with meet same time usb host 100 can only with the specification of USB peripherals 105 communications.The one USB circuit 2011 also has the error of transmission audit function, for example transmits the inspection work of the cyclic redundancy check and correction character (Cyclic Redundancy Check Code) of data.
Please refer to Fig. 4, then explanation is according to the radio transmitting method of the wireless transmission usb hub of preferred embodiment of the present invention.At first remote concentrator 203 detects the connection status (S41) of USB device 302, go up remote concentrator 203 if there is USB device 302 to connect, 203 related information transmission of collecting USB device 302 of remote concentrator are to usb host 100 (S42), and its transmission mode is no longer set forth at this as mentioned above.After USB device 302 is finished connection, usb host 100 can send steering order (S43), with USB communications protocol and 201 communications of USB logic concentrator, USB logic concentrator 201 is converted to steering order to launch behind the home control network communication protocol form broadcasts away (S44), after remote concentrator 203 is received the steering order of broadcasting, steering order is reduced into the steering order (S45) of USB communications protocol form, and carry out this steering order and USB device 302 communications (S46), USB device 302 is made appropriate responsive and is back to remote concentrator (S47) with the USB communications protocol according to this steering order, this responds to launch after remote concentrator 203 converts the home control network communication protocol form to again broadcasts away (S48), last USB logic concentrator receives this response, and be reduced into USB communications protocol form and usb host 100 communications (S49), finish the communication of usb host 100 and USB device 302.
According to embodiments of the invention, 25 meters that maximum distance is connected except cable between usb host and USB peripherals, add the distance of wireless transmission of the present invention, therefore the restriction that can solve 25 meters of maximum distances, with blue bud Radio Transmission Technology is example, and the transmission range farthest between usb host and USB peripherals extends to 65 meters.It is noted that, the coverage of wireless transmission is relevant with employed Radio Transmission Technology and power, therefore if utilize different Radio Transmission Technologys to make wireless transmission distance between USB logic concentrator of the present invention and remote concentrator greater than more than 15 meters, add 10 meters length of two ends cable, promptly can reach the distance that prolongs between usb host and USB peripherals with the usb hub of one group of wireless transmission, solve 25 meters specification limits, can save the cost of its excess-three usb hub, and the trouble of wiring can avoid cable to connect the time and the movability that increases portable usb host.Simultaneously, the computer interface equipment that only has the USB transmission interface, only need to be connected, can have the convenience of wireless transmission, and not need the higher computer interface equipment of acquisition price with wireless transmission interface with the remote concentrator of wireless transmission usb hub of the present invention.
The above for for example, is not in order to restriction the present invention only.Any those skilled in the art all can carry out the modification of equivalence according to the embodiment of the invention described above, and does not break away from its spirit and category.Anyly do not break away from spirit of the present invention and category, and, all should be contained within the scope of patent protection of the present invention its equivalent modifications of carrying out or change.
Claims (16)
1. the universal serial bus concentrator of a wireless transmission, it is characterized in that: be used to connect an epigyny device and a universal serial bus device, make this epigyny device and the communication mutually of this universal serial bus device, the universal serial bus concentrator of this wireless transmission comprises:
One USB (universal serial bus) logic concentrator, having at least one upwards transmission port is connected with this epigyny device, and has one first a rf data assembly, can do wireless telecommunications with the corresponding radio frequency data package, this USB (universal serial bus) logic concentrator is emulation one universal serial bus concentrator, in order to receive and to transmit the steering order of a USB host; And
One remote concentrator, have a plurality of ports that pass down, each passes port down and can be connected with this universal serial bus device, and has one second a rf data assembly, can do wireless telecommunications with this first rf data assembly of this USB (universal serial bus) logic concentrator, this remote concentrator is to connect the connection status of this universal serial bus device in order to detect this time biography port, and utilizes this second rf data assembly that this connection status is sent to this USB (universal serial bus) logic concentrator.
2. the universal serial bus concentrator of wireless transmission as claimed in claim 1, it is characterized in that: wherein this USB (universal serial bus) logic concentrator more can receive the connection status that passes port from this time of this remote concentrator, and is sent to this epigyny device with the USB (universal serial bus) communications protocol.
3. the universal serial bus concentrator of described wireless transmission as claimed in claim 1, it is characterized in that: wherein this USB (universal serial bus) logic concentrator more provides the error of transmission audit function.
4. the universal serial bus concentrator of described wireless transmission as claimed in claim 1, it is characterized in that: wherein this remote concentrator more can be collected and be connected to the device information that this time passes this universal serial bus device of port, and is sent to this USB (universal serial bus) logic concentrator with this second rf data assembly.
5. the universal serial bus concentrator of described wireless transmission as claimed in claim 1, it is characterized in that: wherein this remote concentrator more can be carried out the steering order of this USB host to this universal serial bus device.
6. the universal serial bus concentrator of described wireless transmission as claimed in claim 1, it is characterized in that: wherein this USB (universal serial bus) logic concentrator further comprises:
One first USB (universal serial bus) circuit is this universal serial bus concentrator of emulation, replaces this universal serial bus device and this epigyny device to carry out communication with the USB (universal serial bus) communications protocol;
One first communications protocol transition components, be to become the data of radio-frequency communication protocol format from the data-switching of the USB (universal serial bus) communications protocol form of this epigyny device, perhaps will become the data of USB (universal serial bus) communications protocol form from the data-switching of the radio-frequency communication protocol format of this universal serial bus device; And
One first radio circuit, be these radio-frequency communication protocol format data that receive from this first USB (universal serial bus) circuit, and be sent to this remote concentrator, or receive from the response of this remote concentrator and be sent to this first USB (universal serial bus) circuit via this first rf data assembly.
7. the universal serial bus concentrator of described wireless transmission as claimed in claim 1, it is characterized in that: wherein this remote concentrator more comprises:
One second USB (universal serial bus) circuit is the connection status that detects this universal serial bus device, and carries out communication with USB (universal serial bus) communications protocol and this universal serial bus device;
One second communications protocol transition components, be to become the data of USB (universal serial bus) communications protocol form from the data-switching of the radio-frequency communication protocol format of this epigyny device, perhaps will become the data of radio-frequency communication protocol format from the data-switching of the USB (universal serial bus) communications protocol form of this universal serial bus device; And
One second radio circuit, be to receive from the steering order of this USB (universal serial bus) logic concentrator and be sent to this second USB (universal serial bus) circuit, or receive these radio-frequency communication protocol format data, and be sent to this USB (universal serial bus) logic concentrator via this second rf data assembly from this second USB (universal serial bus) circuit.
8. the universal serial bus concentrator of described wireless transmission as claimed in claim 1 is characterized in that: wherein this second USB (universal serial bus) circuit more can be planned the scheduling of a plurality of USB (universal serial bus) transaction.
9. the radio transmitting method of a USB (universal serial bus) (USB (universal serial bus)) hub, it is characterized in that: described method comprises:
One USB host sends a steering order;
One USB (universal serial bus) logic concentrator converts this steering order of USB (universal serial bus) communications protocol form the steering order of a radio-frequency communication protocol format to and broadcasts away;
One remote concentrator receives the steering order of this radio-frequency communication protocol format, and converts the steering order of this USB (universal serial bus) communications protocol form to;
This steering order carried out by this remote concentrator and a universal serial bus device carries out communication;
This universal serial bus device produces a response at this steering order;
This response is broadcasted away after this remote concentrator becomes the radio-frequency communication protocol format by USB (universal serial bus) communications protocol format conversion; And
This USB (universal serial bus) logic concentrator receives the response of this radio-frequency communication protocol format, and converts response and this USB host communication of this USB (universal serial bus) communications protocol form to.
10. the radio transmitting method of the universal serial bus concentrator of wireless transmission as claimed in claim 9, it is characterized in that: described method comprises that further this remote concentrator detects the connection status of this universal serial bus device.
11. the radio transmitting method of the universal serial bus concentrator of wireless transmission as claimed in claim 10, it is characterized in that: described method further comprises if this universal serial bus device is connected with this remote concentrator, then transmits the relevant information of this universal serial bus device and return this USB host.
12. USB (universal serial bus) logic concentrator, it is characterized in that: described USB (universal serial bus) logic concentrator cooperates with a remote concentrator, be used to connect an epigyny device and a universal serial bus device to carry out wirelessly transmitting data, this remote concentrator comprises one second rf data assembly and a plurality of port that passes down, this second rf data assembly is to be connected with this USB (universal serial bus) logic concentrator with wireless transmission method, this time passes port and then is connected with this universal serial bus device, and this USB (universal serial bus) logic concentrator comprises:
One first rf data assembly is to be connected with this remote concentrator with wireless transmission method, to carry out exchanges data; And
At least one upwards transmission port is in order to be connected with this epigyny device, with the steering order of reception/transmission one USB host.
13. USB (universal serial bus) logic concentrator as claimed in claim 12 is characterized in that: this USB (universal serial bus) logic concentrator further comprises:
One first USB (universal serial bus) circuit is this universal serial bus concentrator of emulation, replaces this universal serial bus device and this epigyny device to carry out communication with the USB (universal serial bus) communications protocol;
One first communications protocol transition components, be to become the data of radio-frequency communication protocol format from the data-switching of the USB (universal serial bus) communications protocol form of this epigyny device, perhaps will become the data of USB (universal serial bus) communications protocol form from the data-switching of the radio-frequency communication protocol format of this universal serial bus device; And
One first radio circuit, be these radio-frequency communication protocol format data that receive from this first USB (universal serial bus) circuit, and be sent to this remote concentrator, or receive from the response of this remote concentrator and be sent to this first USB (universal serial bus) circuit via this first rf data assembly.
14. remote concentrator, it is characterized in that: it cooperates with a USB (universal serial bus) logic concentrator, be used to connect an epigyny device and a universal serial bus device to carry out wirelessly transmitting data, this USB (universal serial bus) logic concentrator comprises one first rf data assembly and at least one upwards transmission port, this first rf data assembly is to be connected with this remote concentrator with wireless transmission method, this upwards transmission port then is connected with this epigyny device, and this remote concentrator comprises:
One second rf data assembly is to be connected with this USB (universal serial bus) logic concentrator with wireless transmission method, to carry out exchanges data; And
A plurality of ports that pass down are in order to be connected with this universal serial bus device, with the steering order of reception/transmission one USB host.
15. remote concentrator as claimed in claim 14 is characterized in that: this remote concentrator further comprises:
One second USB (universal serial bus) circuit is the connection status that detects this universal serial bus device, and carries out communication with USB (universal serial bus) communications protocol and this universal serial bus device;
One second communications protocol transition components, be to become the data of USB (universal serial bus) communications protocol form from the data-switching of the radio-frequency communication protocol format of this epigyny device, perhaps will become the data of radio-frequency communication protocol format from the data-switching of the USB (universal serial bus) communications protocol form of this universal serial bus device; And
One second radio circuit, be to receive from the steering order of this USB (universal serial bus) logic concentrator and be sent to this second USB (universal serial bus) circuit, or receive these radio-frequency communication protocol format data, and be sent to this USB (universal serial bus) logic concentrator via this second rf data assembly from this second USB (universal serial bus) circuit.
16. remote concentrator as claimed in claim 15 is characterized in that: wherein this second USB (universal serial bus) circuit more can be planned the scheduling of a plurality of USB (universal serial bus) transaction.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA03136201XA CN1549145A (en) | 2003-05-16 | 2003-05-16 | Universal serial bus concentrator for wireless transmission and wireless transmitting method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA03136201XA CN1549145A (en) | 2003-05-16 | 2003-05-16 | Universal serial bus concentrator for wireless transmission and wireless transmitting method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100481055C (en) * | 2007-07-31 | 2009-04-22 | 威盛电子股份有限公司 | Serial bus communications system |
| CN101529401B (en) * | 2006-07-28 | 2013-09-18 | 伊克隆技术公司 | Method and apparatus for distributing USB hub functions across a network |
| CN103460650A (en) * | 2011-03-15 | 2013-12-18 | 欧姆龙株式会社 | Network system, master device, and method for controlling network system |
| CN109542812A (en) * | 2018-09-30 | 2019-03-29 | 惠州市德赛西威汽车电子股份有限公司 | Data communication control method, device and terminal device |
| CN109840230A (en) * | 2019-04-17 | 2019-06-04 | 华东师范大学 | Interface conversion equipment |
-
2003
- 2003-05-16 CN CNA03136201XA patent/CN1549145A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101529401B (en) * | 2006-07-28 | 2013-09-18 | 伊克隆技术公司 | Method and apparatus for distributing USB hub functions across a network |
| CN100481055C (en) * | 2007-07-31 | 2009-04-22 | 威盛电子股份有限公司 | Serial bus communications system |
| CN103460650A (en) * | 2011-03-15 | 2013-12-18 | 欧姆龙株式会社 | Network system, master device, and method for controlling network system |
| CN109542812A (en) * | 2018-09-30 | 2019-03-29 | 惠州市德赛西威汽车电子股份有限公司 | Data communication control method, device and terminal device |
| CN109542812B (en) * | 2018-09-30 | 2022-06-24 | 惠州市德赛西威汽车电子股份有限公司 | Data communication control method and device and terminal equipment |
| CN109840230A (en) * | 2019-04-17 | 2019-06-04 | 华东师范大学 | Interface conversion equipment |
| CN109840230B (en) * | 2019-04-17 | 2024-05-10 | 华东师范大学 | Interface conversion device |
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