CN105657204A - 4G wireless fax device with IP voice function and application method thereof - Google Patents
4G wireless fax device with IP voice function and application method thereof Download PDFInfo
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- CN105657204A CN105657204A CN201610068111.5A CN201610068111A CN105657204A CN 105657204 A CN105657204 A CN 105657204A CN 201610068111 A CN201610068111 A CN 201610068111A CN 105657204 A CN105657204 A CN 105657204A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
- H04M11/06—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors
- H04M11/066—Telephone sets adapted for data transmision
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/1066—Session management
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M7/00—Arrangements for interconnection between switching centres
- H04M7/006—Networks other than PSTN/ISDN providing telephone service, e.g. Voice over Internet Protocol (VoIP), including next generation networks with a packet-switched transport layer
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/32—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
- H04N1/327—Initiating, continuing or ending a single-mode communication; Handshaking therefor
- H04N1/32704—Establishing a communication with one of a facsimile and another telecommunication apparatus sharing a single line
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Multimedia (AREA)
- Business, Economics & Management (AREA)
- General Business, Economics & Management (AREA)
- Facsimiles In General (AREA)
- Facsimile Transmission Control (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The invention discloses a 4G wireless fax device with an IP voice function and an application method thereof. The 4G wireless fax device with the IP voice function comprises a central processing unit, an Ethernet interface chip, a routing module, a 4G wireless data transmission module, a fax machine connection unit and a telephone connection unit; the central processing unit, the Ethernet interface chip, the routing module and the 4G wireless data transmission module are sequentially connected; the fax machine connection unit comprises a fax interface circuit and a modem, and a fax machine interface circuit, the modem and the central processing unit are sequentially connected; the telephone connection unit comprises a telephone interface circuit and a voice coding and decoding circuit, and the telephone interface circuit, the voice coding and decoding circuit and the central processing unit are sequentially connected. The 4G wireless fax device with the IP voice function integrates the IP voice function and a wireless fax function into a whole body; depending on a 4G mobile network, highly efficient transmission of voice and fax is implemented, so that the 4G wireless fax device has low costs and is simple and easy to use.
Description
Technical field
The present invention relates to a kind of 4G wireless facsimile device and using method thereof with ip voice function.
Background technology
Traditional radio facsimile and voice call are all used CSD (CircuitSwitchedData), be that circuit switched data technology is respectively as fax and the Deta bearer mode of voice, but due to the complexity of wireless network, fax tandem exchange perfect not, the problems such as limited wireless network resource is taken in a large number, radio facsimile equipment cannot spread, expensive in order to save guarantor, limited Internet resources bandwidth, voice in CSD mode have adopted the voice coding of poor-performing, speech quality is poor, and cannot carry CSD voice on 4G network, in the time that user uses CSD voice, must fall back to 2G state, affecting user experiences. therefore, for meeting the market requirement, in the urgent need to setting up the Technical Architecture of a kind of new radio facsimile and voice, by building radio facsimile and voice service system, the new radio facsimile speech ciphering equipment of design based on Radio Transmission Technology realized 4G radio facsimile function and voice ip voice function.
Ip voice (VOIP) refers to transmitting voice service on IP network, through research and development for a long time, ip voice is a relatively ripe technology, and for telecommunications and internet, but along with the demand of ip voice business constantly increases growth, design ip voice scheme more cheaply, become the problem of equipment vendors' headache. Nowadays, what on market, generally use is that TI reaches fragrant neat DSP platform, and the manpower and financial resources cost of input is high, and software development difficulty is very big, and can only only have a kind of outlet mode, i.e. Wired access mode, and Scalable Performance is poor.
In view of this, inventor's especial manufacture goes out a kind of 4G wireless facsimile device with ip voice function, and this case produces thus.
Summary of the invention
The object of the present invention is to provide a kind of 4G wireless facsimile device and using method thereof with ip voice function, it integrates ip voice function and radio facsimile function, realizes voice and fax high efficiency of transmission by 4G mobile network, and cost is low, is simple and easy to use.
To achieve these goals, technical scheme of the present invention is as follows:
With a 4G wireless facsimile device for ip voice function, comprise central processing unit, Ethernet chip, routing module, 4G wireless data transmission module, facsimile machine linkage unit and telephone set linkage unit; Described central processing unit, Ethernet chip, routing module and 4G wireless data transmission module are connected successively; Described facsimile machine linkage unit comprises facsimile machine interface circuit and modem, and facsimile machine interface circuit, modem and central processing unit are connected successively; Described telephone set linkage unit comprises telephone interface circuit and encoding and decoding speech circuit, and telephone interface circuit, encoding and decoding speech circuit are connected successively with central processing unit.
Described central processing unit is Cortex-M4STM32F405 processor.
Described routing module is MT7620 routing module.
Described 4G wireless data transmission module is the 4G wireless data transmission module of can be simultaneously compatible mobile communication UNICOM.
Described central processing unit is connected with encoding and decoding speech circuit by IIS interface.
A kind of using method of the 4G wireless facsimile device with ip voice function, comprise fax and two kinds of mode of operations of ip voice, fax pattern and ip voice pattern all rely on wireless network and carry out work, and wireless network accesses a facsimile data service centre, wherein, fax pattern comprises the following steps:
S1. install initialization, network registry and dial-up connection:
Every 4G wireless facsimile device with ip voice function is encoded, and its IP in fax speech data service centre is set; After central processing unit is assigned register instruction control routing module and is dialled by 4G module, be registered to wireless network, simultaneously from dynamic IP of WMG automatic acquisition, completing data call and network connects, central processing unit is connected in 4G wireless routing module by Ethernet chip, and finishing equipment registration is connected with data;
S2. fax paper obtains and sends:
Wherein a 4G wireless facsimile device with ip voice function is as fax calling party, fax calling party's facsimile machine interface circuit access caller facsimile machine, caller facsimile machine is sent to modem by the mode of analog signal by facsimile machine interface circuit by the fax paper obtaining after scanning, convert to and can and carry facsimile data and the fax data signal of callee's data, services IP in transmitted over wireless networks by modem, then by 4G wireless data transmission module, fax data signal is uploaded to facsimile data service centre;
S3. fax paper receives:
The 4G wireless facsimile device of another of data, services IP that corresponding step S2 data signal is found by facsimile data service centre with ip voice function is as fax callee, and fax callee's facsimile machine interface circuit accesses called facsimile machine; Fax callee's 4G wireless data transmission module obtains fax data signal by wireless network from facsimile data service centre, then converts analog signal to through callee's modem, is then sent to callee's facsimile machine by facsimile machine interface circuit; If net outer PSTN fax, send to fax callee facsimile machine by the gateway sub-block in voice facsimile data service center;
Described ip voice pattern comprises the following steps:
S10. user's registration:
Every 4G wireless facsimile device with ip voice function is encoded, and its IP in fax speech data service centre is set; Central processing unit is registered to wireless network after assigning register instruction control routing module and dialling by 4G module, simultaneously from dynamic IP of WMG automatic acquisition, completes data call and network and connects; Central processing unit is connected on routing module by Ethernet chip, and finishing equipment registration is connected with data; At the equipment of the 4G wireless facsimile device with ip voice function, during as ip voice calling party, ip voice callee can be PSTN telephone or an other 4G wireless facsimile device with ip voice function;
S11. session establishment:
While dialing with the 4G wireless facsimile device caller of ip voice function, telephone interface circuit is delivered to dialled telephone number in dual-tone multifrequency decoding circuit, reads decoded information by central processing unit; After dialing, start and be connected with callee's circuit, simultaneously, calling party constantly delivers to voice coding circuit language analog signal and encodes, generate voice digital signal, after coding, read voice digital signal by central processing unit by IIS interface, and send voice digital signal by routing module and 4G wireless data transmission module to fax speech data service centre, identify on-net call or rete mirabile calling according to callee's number;
S12. phonetic incepting:
If rete mirabile is called out, forward voice digital signal by the voice gateways in fax speech data service centre, transmit by PSTN circuit;
If on-net call, the 4G wireless transport module of the 4G wireless facsimile device with ip voice function by callee receives voice digital signal, central processing unit reads voice digital signal by Ethernet chip from routing module, send to encoding and decoding speech circuit by IIS interface, after decoding, generate voice analog signal, then by telephone interface circuit, voice digital signal is transferred to telephone set, be finally reduced into original speech information.
In described step S13, when callee receives voice packet, central processing unit provides the reception buffer zone of a variable-length, and this reception buffer zone at least can hold two voice packets.
Beneficial effect of the present invention is: the present invention combines in radio facsimile and ip voice function in a device, share Ethernet chip, routing module and 4G wireless data transmission module at wireless network link, connect facsimile machine at fax end by facsimile machine linkage unit, connect telephone set in end-speech by telephone set linkage unit, facsimile machine linkage unit and telephone set linkage unit gather, change fax paper and voice analog signal respectively and the processing such as reception, efficient work, application cost is low.
Below in conjunction with the drawings and specific embodiments, the present invention will be further described.
Brief description of the drawings
Fig. 1 is structural representation of the present invention;
Fig. 2 is the flow chart of ip voice pattern of the present invention;
Fig. 3 is the structural representation of access of radio network work of the present invention.
Label declaration
Central processing unit 1, Ethernet chip 2, routing module 3,4G wireless data sending mould 4, facsimile machine linkage unit 5, facsimile machine interface circuit 51, modem 52, telephone set linkage unit 6, telephone interface circuit 61, encoding and decoding speech circuit 62.
Detailed description of the invention
A kind of 4G wireless facsimile device with ip voice function that the present invention discloses as shown in Figure 1, comprises central processing unit 1, Ethernet chip 2, routing module 3,4G wireless data transmission module 4, facsimile machine linkage unit 5 and telephone set linkage unit 6; Described central processing unit 1, Ethernet chip 2, routing module 3 and 4G wireless data transmission module 4 are connected successively; Described facsimile machine linkage unit 5 comprises facsimile machine interface circuit 51 and modem 52, and facsimile machine interface circuit 51, modem 52 and central processing unit 1 are connected successively; Described telephone set linkage unit 6 comprises telephone interface circuit 61 and encoding and decoding speech circuit 62, telephone interface circuit 61, encoding and decoding speech circuit 62 and central processing unit 1 are connected successively, and wherein said central processing unit 1 adopts by IIS interface and is connected with encoding and decoding speech circuit 62.
In the present embodiment, described central processing unit 1 is Cortex-M4STM32F405 processor, it is based on ARMCortex-M4,32 RISC kernels, the highest 168Mhz frequency that works in, embedded flash memory at a high speed, integrated enhanced peripheral hardware and I/O mouth, the communication interface of floating number and DSP calculation function and standard is provided, well response speed, has higher execution efficiency, can work in the operating voltage of 2.0V ~ 3.6V; And use Cortex-M4STM32F405 central processing unit and encoding and decoding speech circuit to realize the inhibition of encoding and decoding speech and sidetone elimination function and echo, than DSP process chip, lower based on Cortex-M4STM32F405 processor development cost. Based on realizing in the above-mentioned hardware of facsimile function (comprising facsimile machine interface circuit 51, modem 52 and central processing unit 1), preferred function iteration is strong, is convenient to the independent development language micropython language of software development.
In the present embodiment, described routing module 3 is MT7620 routing module, it is universal routing module, be connected by USB interface with wireless 4G module, realize NDIS dial feature, can realize LAN/WAN/2.4GWIFI and connect, and can realize the conversion of various protocols, use OPENWRT open source software, and easily realize the functions such as TCP/IP, Session Initiation Protocol.
The preferred SLIC user interface circuit of described facsimile machine interface circuit and telephone interface circuit, in its circuit design, adopt modularized design, integrated DC/DC conversion, positive antipole switch, constant current feed circuit, two/tetra-line mapping functions, the stability of raising system and reliability, multiple prompt tone function that it is more integrated; Described 4G wireless data transmission module is the 4G wireless data transmission module of can be simultaneously compatible mobile communication UNICOM; Described central processing unit is connected with encoding and decoding speech circuit by IIS interface.
A kind of using method of the 4G wireless facsimile device with ip voice function, comprise fax and two kinds of mode of operations of ip voice, fax pattern and ip voice pattern all rely on wireless network and carry out work, and wireless network accesses a facsimile data service centre, wherein, fax pattern comprises the following steps:
S1. install initialization, network registry and dial-up connection:
Every 4G wireless facsimile device with ip voice function is encoded, and its IP in fax speech data service centre is set; After central processing unit is assigned register instruction control routing module and is dialled by 4G module, be registered to wireless network, simultaneously from dynamic IP of WMG automatic acquisition, completing data call and network connects, central processing unit is connected in 4G wireless routing module by Ethernet chip, and finishing equipment registration is connected with data;
S2. fax paper obtains and sends:
Wherein a 4G wireless facsimile device with ip voice function is as fax calling party, fax calling party's facsimile machine interface circuit access caller facsimile machine, caller facsimile machine is sent to modem by the mode of analog signal by facsimile machine interface circuit by the fax paper obtaining after scanning, convert to and can and carry facsimile data and the fax data signal of callee's data, services IP in transmitted over wireless networks by modem, then by 4G wireless data transmission module, fax data signal is uploaded to facsimile data service centre;
S3. fax paper receives:
The 4G wireless facsimile device of another of data, services IP that corresponding step S2 data signal is found by facsimile data service centre with ip voice function is as fax callee, and fax callee's facsimile machine interface circuit accesses called facsimile machine; Fax callee's 4G wireless data transmission module obtains fax data signal by wireless network from facsimile data service centre, then converts analog signal to through callee's modem, is then sent to callee's facsimile machine by facsimile machine interface circuit; If net outer PSTN fax, send to fax callee facsimile machine by the gateway sub-block in voice facsimile data service center;
As shown in Figure 2, described ip voice pattern comprises the following steps:
S10. user's registration:
Every 4G wireless facsimile device with ip voice function is encoded, and its IP in fax speech data service centre is set; Central processing unit is registered to wireless network after assigning register instruction control routing module and dialling by 4G module, simultaneously from dynamic IP of WMG automatic acquisition, completes data call and network and connects; Central processing unit is connected on routing module by Ethernet chip, and finishing equipment registration is connected with data; At the equipment of the 4G wireless facsimile device with ip voice function, during as ip voice calling party, ip voice callee can be PSTN telephone or an other 4G wireless facsimile device with ip voice function; Figure 3 shows that the structural representation of many 4G wireless facsimile device access network work with ip voice function;
S11. session establishment:
While dialing with the 4G wireless facsimile device caller of ip voice function, telephone interface circuit is delivered to dialled telephone number in dual-tone multifrequency decoding circuit, reads decoded information by central processing unit; After dialing, start and be connected with callee's circuit, simultaneously, calling party constantly delivers to voice coding circuit language analog signal and encodes, generate voice digital signal, after coding, read voice digital signal by central processing unit by IIS interface, and send voice digital signal by routing module and 4G wireless data transmission module to fax speech data service centre, identify on-net call or rete mirabile calling according to callee's number;
S12. phonetic incepting:
If rete mirabile is called out, forward voice digital signal by the voice gateways in fax speech data service centre, transmit by PSTN circuit;
If on-net call, the 4G wireless transport module of the 4G wireless facsimile device with ip voice function by callee receives voice digital signal, central processing unit reads voice digital signal by Ethernet chip from routing module, send to encoding and decoding speech circuit by IIS interface, after decoding, generate voice analog signal, then by telephone interface circuit, voice digital signal is transferred to telephone set, be finally reduced into original speech information.
In described step S13, when callee receives voice packet, central processing unit provides the reception buffer zone of a variable-length, the shake producing for regulating networks, this reception buffer zone at least can hold two voice packets, the size that can regulate according to network delay this buffering area, little buffering area time delay is little, but can not regulate large shake.
The present invention combines in radio facsimile and ip voice function in a device, share Ethernet chip, routing module and 4G wireless data transmission module at wireless network link, connect facsimile machine at fax end by facsimile machine linkage unit, connect telephone set in end-speech by telephone set linkage unit, facsimile machine linkage unit and telephone set linkage unit gather, change fax paper and voice analog signal respectively and the processing such as reception, efficient work, application cost is low.
These are only specific embodiments of the invention, not the restriction to protection scope of the present invention. All equivalent variations of doing according to the mentality of designing of this case, all fall into the protection domain of this case.
Claims (7)
1. the 4G wireless facsimile device with ip voice function, is characterized in that: comprise central processing unit, Ethernet chip, routing module, 4G wireless data transmission module, facsimile machine linkage unit and telephone set linkage unit; Described central processing unit, Ethernet chip, routing module and 4G wireless data transmission module are connected successively; Described facsimile machine linkage unit comprises facsimile machine interface circuit and modem, and facsimile machine interface circuit, modem and central processing unit are connected successively; Described telephone set linkage unit comprises telephone interface circuit and encoding and decoding speech circuit, and telephone interface circuit, encoding and decoding speech circuit are connected successively with central processing unit.
2. a kind of 4G wireless facsimile device with ip voice function as claimed in claim 1, is characterized in that: described central processing unit is Cortex-M4STM32F405 processor.
3. a kind of 4G wireless facsimile device with ip voice function as claimed in claim 1, is characterized in that: described routing module is MT7620 routing module.
4. a kind of 4G wireless facsimile device with ip voice function as claimed in claim 1, is characterized in that: described 4G wireless data transmission module is the 4G wireless data transmission module of can be simultaneously compatible mobile communication UNICOM.
5. a kind of 4G wireless facsimile device with ip voice function as claimed in claim 1, is characterized in that: described central processing unit is connected with encoding and decoding speech circuit by IIS interface.
6. the using method of the 4G wireless facsimile device with ip voice function, it is characterized in that: comprise fax and two kinds of mode of operations of ip voice, fax pattern and ip voice pattern all rely on wireless network and carry out work, wireless network accesses a facsimile data service centre, wherein, fax pattern comprises the following steps:
S1. install initialization, network registry and dial-up connection:
Every 4G wireless facsimile device with ip voice function is encoded, and its IP in fax speech data service centre is set; After central processing unit is assigned register instruction control routing module and is dialled by 4G module, be registered to wireless network, simultaneously from dynamic IP of WMG automatic acquisition, completing data call and network connects, central processing unit is connected in 4G wireless routing module by Ethernet chip, and finishing equipment registration is connected with data;
S2. fax paper obtains and sends:
Wherein a 4G wireless facsimile device with ip voice function is as fax calling party, fax calling party's facsimile machine interface circuit access caller facsimile machine, caller facsimile machine is sent to modem by the mode of analog signal by facsimile machine interface circuit by the fax paper obtaining after scanning, convert to and can and carry facsimile data and the fax data signal of callee's data, services IP in transmitted over wireless networks by modem, then by 4G wireless data transmission module, fax data signal is uploaded to facsimile data service centre;
S3. fax paper receives:
The 4G wireless facsimile device of another of data, services IP that corresponding step S2 data signal is found by facsimile data service centre with ip voice function is as fax callee, and fax callee's facsimile machine interface circuit accesses called facsimile machine; Fax callee's 4G wireless data transmission module obtains fax data signal by wireless network from facsimile data service centre, then converts analog signal to through callee's modem, is then sent to callee's facsimile machine by facsimile machine interface circuit; If net outer PSTN fax, send to fax callee facsimile machine by the gateway sub-block in voice facsimile data service center;
Described ip voice pattern comprises the following steps:
S10. user's registration:
Every 4G wireless facsimile device with ip voice function is encoded, and its IP in fax speech data service centre is set; Central processing unit is registered to wireless network after assigning register instruction control routing module and dialling by 4G module, simultaneously from dynamic IP of WMG automatic acquisition, completes data call and network and connects; Central processing unit is connected on routing module by Ethernet chip, and finishing equipment registration is connected with data; At the equipment of the 4G wireless facsimile device with ip voice function, during as ip voice calling party, ip voice callee can be PSTN telephone or an other 4G wireless facsimile device with ip voice function;
S11. session establishment:
While dialing with the 4G wireless facsimile device caller of ip voice function, telephone interface circuit is delivered to dialled telephone number in dual-tone multifrequency decoding circuit, reads decoded information by central processing unit; After dialing, start and be connected with callee's circuit, simultaneously, calling party constantly delivers to voice coding circuit language analog signal and encodes, generate voice digital signal, after coding, read voice digital signal by central processing unit by IIS interface, and send voice digital signal by routing module and 4G wireless data transmission module to fax speech data service centre, identify on-net call or rete mirabile calling according to callee's number;
S12. phonetic incepting:
If rete mirabile is called out, forward voice digital signal by the voice gateways in fax speech data service centre, transmit by PSTN circuit;
If on-net call, the 4G wireless transport module of the 4G wireless facsimile device with ip voice function by callee receives voice digital signal, central processing unit reads voice digital signal by Ethernet chip from routing module, send to encoding and decoding speech circuit by IIS interface, after decoding, generate voice analog signal, then by telephone interface circuit, voice digital signal is transferred to telephone set, be finally reduced into original speech information.
7. the using method of a kind of 4G wireless facsimile device with ip voice function as claimed in claim 6, it is characterized in that: in described step S13, when callee receives voice packet, central processing unit provides the reception buffer zone of a variable-length, and this reception buffer zone at least can hold two voice packets.
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| CN201610068111.5A CN105657204A (en) | 2016-02-01 | 2016-02-01 | 4G wireless fax device with IP voice function and application method thereof |
| CN201710061409.8A CN106921654B (en) | 2016-02-01 | 2017-01-26 | A kind of 4G wireless facsimile device, system and its ip voice processing method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106231156A (en) * | 2016-08-31 | 2016-12-14 | 泉州市壹灯照明科技有限公司 | A kind of Internet fax system based on pstn telephone network |
| CN107948459A (en) * | 2017-11-03 | 2018-04-20 | 延安大学 | A kind of transmission equipment and its transmission method based on short wave communication |
| CN111611016A (en) * | 2020-05-25 | 2020-09-01 | 成都银汉易科技有限公司 | Method for loading MicroPython based on space-time isolation domain |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112073589B (en) * | 2020-11-12 | 2021-02-05 | 深圳市新龙鹏科技有限公司 | Intelligent gateway VOIP wireless call method, device, equipment and storage medium |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101657027B (en) * | 2009-09-10 | 2012-12-05 | 普天通信有限责任公司 | Wireless faxing method, device and system |
| CN101795335A (en) * | 2010-01-06 | 2010-08-04 | 福建鑫诺通讯技术有限公司 | Conversion method for realizing wireless fax sending and receiving of fax machine |
| CN101784006A (en) * | 2010-01-13 | 2010-07-21 | 厦门四信通信科技有限公司 | Multifunctional 3G/3.5G (the third generation and beyond) wireless integrated gateway |
| JP5974773B2 (en) * | 2012-09-24 | 2016-08-23 | ブラザー工業株式会社 | Communication apparatus and computer program |
-
2016
- 2016-02-01 CN CN201610068111.5A patent/CN105657204A/en active Pending
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- 2017-01-26 CN CN201710061409.8A patent/CN106921654B/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106231156A (en) * | 2016-08-31 | 2016-12-14 | 泉州市壹灯照明科技有限公司 | A kind of Internet fax system based on pstn telephone network |
| CN107948459A (en) * | 2017-11-03 | 2018-04-20 | 延安大学 | A kind of transmission equipment and its transmission method based on short wave communication |
| CN111611016A (en) * | 2020-05-25 | 2020-09-01 | 成都银汉易科技有限公司 | Method for loading MicroPython based on space-time isolation domain |
| CN111611016B (en) * | 2020-05-25 | 2023-03-21 | 成都银汉易科技有限公司 | Method for loading MicroPython based on space-time isolation domain |
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| CN106921654B (en) | 2019-10-22 |
| CN106921654A (en) | 2017-07-04 |
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Application publication date: 20160608 |