CN101359431A - PLC network television teaching system - Google Patents
PLC network television teaching system Download PDFInfo
- Publication number
- CN101359431A CN101359431A CNA2008100650589A CN200810065058A CN101359431A CN 101359431 A CN101359431 A CN 101359431A CN A2008100650589 A CNA2008100650589 A CN A2008100650589A CN 200810065058 A CN200810065058 A CN 200810065058A CN 101359431 A CN101359431 A CN 101359431A
- Authority
- CN
- China
- Prior art keywords
- network
- plc
- audio
- bridge
- terminal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Electrically Operated Instructional Devices (AREA)
Abstract
The invention relates to a PLC network electrified education system which includes an electrified education server, an electrified education terminal and the transmission network which connects the electrified education server with the electrified education terminal for communication; the transmission network includes a power line network (PLC network) and the common network which connects the PLC network with the electrified education server; the PLC network includes the current low-voltage network and the power bridge (PLC bridge) in campus; the PLC bridge processes the PLC modulation conversion and the PLC demodulation conversion according to the preset modulation mode. The current PLC network composed of a low-voltage network, a PLC bridge and a terminal PLC bridge is adopted to replace the most part of the common network of the traditional transmission network, so as to avoid the transmission network from being established among the teaching buildings or classrooms, and simplify the construction of the transmission network; the fund and equipment investments for the electrified education system are saved; the PLC network electrified education system is in accordance with the status quo that the economical conditions of the most small towns and the rural middle and primary schools are relatively weak; the PLC network electrified education system facilitates the wide popularization and application of the electrified education.
Description
Technical field
The present invention relates to the audio-visual education programme in the campus, more particularly, relate to a kind of audio-visual education programme system that utilizes power line network to transmit.
Background technology
Characteristics such as audio-visual education programme has been implemented for many years in China, and from teaching practice, audio-visual education programme is because to have instructional mode intuitively lively, and interactivity is strong have been subjected to the welcome of vast Faculty and Students.A lot of schools have set up direct multimedia audio-visual classroom towards the student, but are subject to factors such as place, fund and technology, and multimedia audio-visual classroom not only quantity is few, and utilization rate is also very low.
The instructional device and the system that are using at present comprise various teaching machines, multimedia teaching apparatus, portable multimedia instructional device and mobile network instructional device etc.Wherein all kinds of teaching machines are towards single subject teaching, very flexible, and the scope of application is little; And multimedia teaching apparatus all is equipped with stereo set, and a part has video capability, also have a small part to use computing machine, but total problem is a complex structure, and function is simple, does not have network function, can't realize in time sharing of teaching resource.The audio/video player system of some audio-visual education programme systems use CATV (cable television) modes, shortcoming is that program is single, and display effect is poor, uses function of interaction control if desired, must be equipped with complicated control and communication system, and construction, operation and maintenance are all very difficult.
Along with development of internet technology, school with good conditionsi has all come into effect the campus network construction in a lot of big and medium-sized cities, and has carried out the audio-visual education programme based on general network.This campus network is usually by setting up one even many audio-visual education programme servers, the communication network of framework special use again, as be distributed in the private network cable in each classroom in the campus by network equipments such as router, switches, reserve at least one access interface in each classroom, make and all can carry out network service when the audio-visual education programme terminal inserts this access interface by this communication network and audio-visual education programme server.In this audio-visual education programme system, need the framework that a large amount of fund of cost and construction period be used for communication network, equipment cost height, construction cost height, the maintenance cost height of this audio-visual education programme system, and also construction gets up to exist workload problem big, long in time limit.And a little less than the economic condition relative thin of most of samll cities and towns of China and rural middle and primary schools, can't bear the fund input of this audio-visual education programme system, make these schools can't enjoy or make full use of the education and instruction resource of various high-qualitys, caused the differentiation of each regional level of education to aggravate day by day, seriously restrict the overall development of China's information education, had influence on the total quality of samll cities and towns and rural middle and elementary school student.
Summary of the invention
The technical problem to be solved in the present invention is, the problem of, long construction period big at the equipment that exists in the Education Literature System in the prior art and material cost height, difficulty of construction provides a kind of PLC (broadband power line communication) network television teaching system that utilizes the existing power spider lines as transmission medium.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of PLC network television teaching system, comprise audio-visual education programme server, audio-visual education programme terminal and connect the transmission network that is used to communicate by letter between audio-visual education programme server and the audio-visual education programme terminal, described transmission network comprise power line network (PLC network) and be connected the PLC network and the audio-visual education programme server between general network; Described PLC network comprises the electric network bridge (PLC bridge) that is provided with between existing low voltage electric network, low voltage electric network and the general network in the campus; Described PLC bridge is converted to the high frequency low voltage electric signal that transmits with the network signal that transmits on the general network on low voltage electric network, promptly carry out the PLC modulation conversion; And the high frequency low voltage electric signal that transmits on the low voltage electric network is reduced to network signal, promptly carry out PLC demodulation conversion; Described electric network bridge is divided into the terminal electric network bridge (terminal PLC bridge) that is provided with between the line concentration electric network bridge (line concentration PLC bridge) that is provided with between low voltage electric network and the general network and low voltage electric network and the audio-visual education programme terminal.
In PLC network television teaching system of the present invention, described PLC network is provided with a line concentration PLC bridge at least in the low voltage electric network of two or two above teaching buildings.
In PLC network television teaching system of the present invention, be provided with a line concentration PLC bridge in the described line concentration PLC network in the low voltage electric network of every teaching building at least.
In PLC network television teaching system of the present invention, described each audio-visual education programme terminal is all mated and is provided with a terminal PLC bridge, and described PLC network is equipped with at least one PLC Network Access Point that terminal PLC bridge is inserted described low voltage electric network in the low voltage electric network of each layer teaching building.
In PLC network television teaching system of the present invention, described PLC network is equipped with at least one described PLC Network Access Point in the low voltage electric network with every classroom of one deck teaching building.
In PLC network television teaching system of the present invention, described terminal PLC bridge is divided into some groups, every group of corresponding described line concentration PLC bridge of terminal PLC bridge, this line concentration PLC bridge only carries out the PLC modulation conversion to the network signal that sends to the corresponding audio-visual education programme terminal of this group terminal PLC bridge, and only the high frequency low voltage electric signal that this group terminal PLC bridge is transmitted carries out PLC demodulation conversion; The high frequency low voltage electric signal that terminal PLC bridge in this group only transmits this line concentration PLC bridge carries out PLC demodulation conversion, only corresponding with it audio-visual education programme terminal is carried out the PLC modulation conversion.
In PLC network television teaching system of the present invention, described audio-visual education programme server comprises server host and input/output device, store the audio-visual education programme data on the described server host, its input media can carry out newly-built and safeguards the operation of audio-visual education programme data server host, and can the audio-visual education programme data be exported by its output unit; Described audio-visual education programme terminal comprises end host and input/output device, described end host can be set up with server host by transmission network and communicate by letter, audio-visual education programme data on its input media may command end host access server main frame also read to end host with it, the audio-visual education programme data output of its output unit on can end host.
In PLC network television teaching system of the present invention, described terminal PLC bridge is fixedly installed on the audio-visual education programme terminal.
In PLC network television teaching system of the present invention, the output unit of described audio-visual education programme terminal comprises LCDs and/or projector.
Implement PLC network television teaching system of the present invention, has following beneficial effect: form the PLC network by utilizing existing low voltage electric network and PLC bridge, and utilize this PLC network to substitute the major part that is connected with the audio-visual education programme terminal in the transmission network, thereby avoided between teaching building or classroom, laying new transmission network, simplified the construction of transmission network, the fund of this television teaching system and the input of equipment have been saved, the weak present situation of economic condition relative thin that meets most of samll cities and towns of China and rural middle and primary schools helps the wide popularization and application of electronic teaching; In addition, when carrying out the construction of PLC network, only need in existing low voltage electric network, insert and set the PLC bridge and get final product, greatly reduce construction complicacy, shortened construction period.
The invention will be further described below in conjunction with drawings and Examples.
Description of drawings
Fig. 1 is the structured flowchart of PLC network television teaching system of the present invention;
Fig. 2 is the schematic network structure of PLC network television teaching system of the present invention.
Embodiment
As shown in Figure 1, in the preferred embodiment of PLC network television teaching system of the present invention, comprise audio-visual education programme server 1 that is arranged in the machine room and the audio-visual education programme terminal 2 that is distributed in each classroom, set up communication by transmission network between audio-visual education programme terminal 2 and the audio-visual education programme server 1.Wherein, transmission network comprises general network 3 and power line network (PLC network) 4.
Audio-visual education programme server 1 mainly comprises main frame, input media and output unit, and its main frame is mainly used in deposits various audio-visual education programme resources for each audio-visual education programme terminal 2 visits, and these audio-visual education programme resources are created or is upgraded by input media.Also can with the main frame access internet (obey as shown in Figure 2, the host computer using router of server inserts the internet) of audio-visual education programme server 1, as utilize network access techniques such as existing ADSL, LAN or satellite network according to specific circumstances.Realize the sharing of various teaching resources of whole distract or country by the internet, can reduce the otherness of teaching level between the each department.In the concrete implementation process, can utilize input media visit and download audio-visual education programme resource on the internet to the main frame of audio-visual education programme server 1, so that the audio-visual education programme terminal in the television teaching system 2 is used; Also can be to the internet with the audio-visual education programme resource sharing of this locality, for the television teaching system visit in other schools or area or download.
Audio-visual education programme terminal 2 be mainly used in for the teacher in classroom or other places (as with audio-visual education programme server 1 not in the same storied building even the building far away that is separated by) audio-visual education programme resource on the visit audio-visual education programme server 1, operations such as the teacher can create it, edits, modification.Audio-visual education programme terminal 2 mainly comprises end host and corresponding input media and output unit, wherein end host is used for communicating by letter with server host foundation by transmission network, input media is used to finish to data manipulations such as the visit of audio-visual education programme resource on the server host and downloads, and output unit is used for downloading to the audio-visual education programme resource output on the end host.
A line concentration PLC bridge 5 is set in being provided with every teaching building of general network access point 8 at least, and this line concentration PLC bridge 5 is arranged between the low voltage electric network of general network access point 8 and teaching building.Existing low voltage electric network has extended to the place that each teacher or teacher need call the audio-visual education programme resource, as long as an electric PLC Network Access Point is set in these places, can realize that audio-visual education programme terminal 2 inserts PLC networks 4 by terminal PLC bridge 6, reach the audio-visual education programme resource of calling in these places on the audio-visual education programme server 1; And need need not use the place of audio-visual education programme resource that an audio-visual education programme terminal 2 all is set at each, thereby significantly reduced the number that is provided with of audio-visual education programme terminal 2, as can the demand that one or two audio-visual education programme terminal 2 can satisfy the teacher being set every layer of teaching building, the equipment of having saved whole television teaching system greatly drops into expense.As shown in Figure 1, every classroom is equipped with a PLC Network Access Point 7, each audio-visual education programme terminal 2 is equipped with a terminal PLC bridge 6, be connected with PLC Network Access Point 7 by terminal PLC bridge 6, realize that audio-visual education programme terminal 2 inserts PLC network 4, and do not need each PLC Network Access Point 7 that a terminal PLC bridge 6 all is set, further saved the equipment cost of this television teaching system.Concrete, PLC Network Access Point 7 can be and the socket of low voltage electric network electric connection that terminal PLC bridge 6 inserts this socket by wire and plug can realize inserting PLC network 4.
In addition, can two or more line concentration PLC bridges 5 be set in a teaching building according to number or how many situations of audio-visual education programme terminal 2 access point numbers between the classroom in the teaching building, as in the teaching building every layer a line concentration PLC bridge 5 all is set; Also a line concentration PLC bridge 5 can only be set in the teaching building more than two or two, insert general network 3 by this line concentration PLC bridge 5.
Like this, only need purchase several audio-visual education programme terminals 2 in samll cities and towns and rural middle and primary schools, a line concentration PLC bridge 5 is set in every teaching building, just can deliver to the classroom that to carry out electronic teaching at any time and go, insert supply socket, promptly insert in the transmission network, easy to use, economical and practical, improve the utilization rate of educational technology equipment simultaneously, satisfy samll cities and towns and the informationalized needs of rural education of middle and primary schools.
Terminal PLC bridge 6 for 2 couplings of a plurality of audio-visual education programme terminals in the foregoing description also can divide into groups to be provided with by corresponding line concentration PLC bridge 5.As shown in Figure 2, be provided with two line concentration PLC bridges in the whole television teaching system, be respectively Wa and Wb; Four or more audio-visual education programme terminal, be divided into two groups be respectively Da1, Da2 in first group ... with second group in Db1, Db2, The terminal PLC bridge that corresponding each audio-visual education programme terminal is provided with, be respectively with first group of audio-visual education programme terminal one to one Ma1, the Ma2 in first group ... with be respectively with second group of audio-visual education programme terminal one to one Mb1, the Mb2 in second group ...Wherein, for be transferred to PLC network of network signal by general network, line concentration PLC bridge Wa judges whether it is the network signal that is transferred to first group of audio-visual education programme terminal earlier, if, this line concentration PLC bridge Wa carries out converting high frequency electrical signal to after the PLC modulation conversion to this network signal and passes in the PLC network, and then network signal transfers in the PLC network by this line concentration PLC bridge Wa; If not, this line concentration PLC bridge Wa directly tackles and does not carry out the PLC modulation conversion, and then this network signal just can not enter the PLC network by this line concentration PLC bridge Wa, and can transfer to the PLC network by the line concentration PLC bridge of other couplings.For the high frequency electrical signal of giving general network by the PLC Network Transmission, this line concentration PLC bridge judges that earlier whether this high frequency electrical signal is to send from the interior audio-visual education programme terminal of corresponding grouping with it, if this line concentration PLC bridge Wa carries out converting network signal to after the PLC demodulation is changed to this high frequency electrical signal and is transferred in the general network; If not, this line concentration PLC bridge Wa directly tackles and does not carry out PLC demodulation conversion, and then this high frequency electrical signal signal just can not enter general network by this line concentration PLC bridge Wa, and transfers to general network by the line concentration PLC bridge of other couplings.
Simultaneously, in the first group terminal PLC bridge corresponding with this line concentration PLC bridge Wa, for high frequency electrical signal from the PLC Network Transmission to the audio-visual education programme terminal, terminal PLC bridge Ma1, Ma2 ... judge whether it is to carry out PLC demodulation conversion by corresponding with it line concentration PLC bridge to come earlier, if, then terminal PLC bridge Ma1, Ma2 ... this high frequency electrical signal is carried out converting network signal to after the PLC demodulation is changed pass to the audio-visual education programme terminal, then high frequency electrical signal is transferred in the corresponding with it audio-visual education programme terminal by this terminal PLC bridge; If not, then terminal PLC bridge Ma1, Ma2 ... directly interception and do not carry out PLC demodulation conversion, then this high frequency electrical signal just can not be transferred to this corresponding with it group audio-visual education programme terminal by any terminal PLC bridge in this group, and can transfer to corresponding audio-visual education programme terminal by other another group terminal PLC bridges that matches.For the network signal of being given other audio-visual education programme terminals or audio-visual education programme server by the audio-visual education programme terminal transmission, Dui Ying terminal PLC bridge directly carries out the PLC modulation conversion with this network signal with it.
By above-mentioned grouping setting, make 5 of each line concentration PLC bridges carry out PLC modulation conversion or PLC demodulation conversion to the signal that transmits in the relevant communication channel of on the same group audio-visual education programme terminal 2 with it, the load that makes it bear is reasonable; On the other hand, can avoid causing the signal transmission in the PLC network 4 to form loop because of low voltage electric network extends in all direction, the problem that causes signal blockage or signal to repeat to give out a contract for a project is got rid of and need not re-use the special-purpose network equipment.
In the preferred embodiment of aforesaid PLC network 4 television teaching systems of the present invention, audio-visual education programme server 1 comprises the input media and the output unit of server host, correspondence; Audio-visual education programme terminal 2 comprises the input media and the output unit of end host, correspondence.Concrete, can to be mouse, keyboard etc. carry out the external unit that various apparatus operating and DVD, VCD etc. provide the audio-visual education programme resource data to server host to the input media of described audio-visual education programme server 1, and its output unit can be the equipment that display etc. shows various operating results or audio-visual education programme resource data.Equally, can to be mouse, keyboard etc. carry out the external unit that various apparatus operating and DVD, VCD etc. provide the audio-visual education programme resource data to server host to the input media of audio-visual education programme terminal 2, and its output unit can be the external unit that display screen, projector etc. show various operating results or displaying or demonstration audio-visual education programme resource data.
Because this television teaching system is mainly towards the teacher, therefore this system mainly needs to realize teacher's visit to audio-visual education programme resource on the audio-visual education programme server 1 in various places, and by at audio-visual education programme server 1 with audio-visual education programme terminal 2 rationally is provided with various devices and module comes this visit is managed.In the various audio-visual education programme resources that the teacher uses, courseware is to use the higher a kind of resource data of frequency, illustrates with this resource of courseware whole PLC network 4 television teaching systems are how to realize sharing of audio-visual education programme resource data below.
The courseware administration module is set on audio-visual education programme server 1, can realizes the operation such as making, retrieval, storage, issue of courseware; Also can be provided with safety control module, be mainly used in operations such as the authentication that realizes the user and log management.When the teacher imparted knowledge to students, the terminal PLC bridge 6 of audio-visual education programme terminal 2 correspondences that this teacher is used inserted the PLC Network Access Point 7 that is provided with in the PLC network 4 in the classroom by plug, i.e. supply socket can insert the PLC campus networks with this audio-visual education programme terminal 2; The teacher can import the safety control module of corresponding log-on message to the end host by the input media of audio-visual education programme terminal 2, this safety control module is with the safety control module of information by the server host of transmission network transmission, judge again whether this information has authority visit audio-visual education programme resource data and feed back to end host, demonstrate corresponding authentication information by output unit, thereby the user who determines audio-visual education programme terminal 2 can continue to visit and use courseware on the audio-visual education programme server 1, and the display screen that courseware is exported to audio-visual education programme terminal 2 uses for the teacher, and the teacher also can show student viewing with this courseware by external units such as projector, study.
In addition, the teacher can directly operate the external unit of audio-visual education programme server 1 by input media after examination at the courseware of having made, directly put into server host, also can be submitted on the audio-visual education programme server by audio-visual education programme terminal 2, relevant auditor puts into server host from audio-visual education programme terminal 2 after examining by other audio-visual education programme terminals 2 again.
Claims (9)
1, a kind of PLC network television teaching system, comprise audio-visual education programme server, audio-visual education programme terminal and connect the transmission network that is used to communicate by letter between audio-visual education programme server and the audio-visual education programme terminal, it is characterized in that, described transmission network comprise power line network (PLC network) and be connected the PLC network and the audio-visual education programme server between general network;
Described PLC network comprises the electric network bridge (PLC bridge) that is provided with between existing low voltage electric network, low voltage electric network and the general network in the campus;
Described PLC bridge is converted to the high frequency low voltage electric signal that transmits with the network signal that transmits on the general network on low voltage electric network, promptly carry out the PLC modulation conversion; And the high frequency low voltage electric signal that transmits on the low voltage electric network is reduced to network signal, promptly carry out PLC demodulation conversion;
Described electric network bridge is divided into the terminal electric network bridge (terminal PLC bridge) that is provided with between the line concentration electric network bridge (line concentration PLC bridge) that is provided with between low voltage electric network and the general network and low voltage electric network and the audio-visual education programme terminal.
According to the described PLC network television teaching system of claim 1, it is characterized in that 2, described PLC network is provided with a line concentration PLC bridge at least in the low voltage electric network of two or two above teaching buildings.
3, according to the described PLC network television teaching system of claim 2, it is characterized in that, be provided with a line concentration PLC bridge in the described line concentration PLC network in the low voltage electric network of every teaching building at least.
4, according to the described PLC network television teaching system of claim 1, it is characterized in that, described each audio-visual education programme terminal is all mated and is provided with a terminal PLC bridge, and described PLC network is equipped with at least one PLC Network Access Point that terminal PLC bridge is inserted described low voltage electric network in the low voltage electric network of each layer teaching building.
According to the described PLC network television teaching system of claim 4, it is characterized in that 5, described PLC network is equipped with at least one described PLC Network Access Point in the low voltage electric network with every classroom of one deck teaching building.
6, according to each described PLC network television teaching system in the claim 1 to 5, it is characterized in that, described terminal PLC bridge is divided into some groups, every group of corresponding described line concentration PLC bridge of terminal PLC bridge, this line concentration PLC bridge only carries out the PLC modulation conversion to the network signal that sends to the corresponding audio-visual education programme terminal of this group terminal PLC bridge, and only the high frequency low voltage electric signal that this group terminal PLC bridge is transmitted carries out PLC demodulation conversion; The high frequency low voltage electric signal that terminal PLC bridge in this group only transmits this line concentration PLC bridge carries out PLC demodulation conversion, only corresponding with it audio-visual education programme terminal is carried out the PLC modulation conversion.
7, according to the described PLC network television teaching system of claim 6, it is characterized in that, described audio-visual education programme server comprises server host and input/output device, store the audio-visual education programme data on the described server host, its input media can carry out newly-built and safeguards the operation of audio-visual education programme data server host, and can the audio-visual education programme data be exported by its output unit; Described audio-visual education programme terminal comprises end host and input/output device, described end host can be set up with server host by transmission network and communicate by letter, audio-visual education programme data on its input media may command end host access server main frame also read to end host with it, the audio-visual education programme data output of its output unit on can end host.
According to the described PLC network television teaching system of claim 7, it is characterized in that 8, described terminal PLC bridge is fixedly installed on the audio-visual education programme terminal.
9, according to the described PLC network television teaching system of claim 7, it is characterized in that the output unit of described audio-visual education programme terminal comprises LCDs and/or projector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100650589A CN101359431A (en) | 2008-01-14 | 2008-01-14 | PLC network television teaching system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100650589A CN101359431A (en) | 2008-01-14 | 2008-01-14 | PLC network television teaching system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101359431A true CN101359431A (en) | 2009-02-04 |
Family
ID=40331867
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008100650589A Pending CN101359431A (en) | 2008-01-14 | 2008-01-14 | PLC network television teaching system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101359431A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102223159A (en) * | 2011-04-27 | 2011-10-19 | 广东广视通科教设备有限公司 | Electric power communication system used for modern middle and primary school teaching experiments |
| CN102594407A (en) * | 2012-03-14 | 2012-07-18 | 深圳市安电科技有限公司 | Networking framework of three-network access community based on PLC technology |
| CN103444133A (en) * | 2010-09-16 | 2013-12-11 | 卡尔克塞达公司 | Performance and power optimized computer system architecture and leveraging power optimized tree fabric interconnecting |
| CN104580142A (en) * | 2013-10-28 | 2015-04-29 | 株式会社理光 | Image projection apparatus, image projection system, image projection method and program thereof |
| CN106302743A (en) * | 2016-08-17 | 2017-01-04 | 成都市极米科技有限公司 | The matching method of projector and mobile terminal and system |
-
2008
- 2008-01-14 CN CNA2008100650589A patent/CN101359431A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103444133A (en) * | 2010-09-16 | 2013-12-11 | 卡尔克塞达公司 | Performance and power optimized computer system architecture and leveraging power optimized tree fabric interconnecting |
| CN102223159A (en) * | 2011-04-27 | 2011-10-19 | 广东广视通科教设备有限公司 | Electric power communication system used for modern middle and primary school teaching experiments |
| CN102594407A (en) * | 2012-03-14 | 2012-07-18 | 深圳市安电科技有限公司 | Networking framework of three-network access community based on PLC technology |
| CN102594407B (en) * | 2012-03-14 | 2014-08-27 | 深圳市安电科技有限公司 | Networking framework of three-network access community based on PLC technology |
| CN104580142A (en) * | 2013-10-28 | 2015-04-29 | 株式会社理光 | Image projection apparatus, image projection system, image projection method and program thereof |
| CN106302743A (en) * | 2016-08-17 | 2017-01-04 | 成都市极米科技有限公司 | The matching method of projector and mobile terminal and system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| TW201923686A (en) | Smart classroom teaching system based on Internet of Things | |
| CN112581814B (en) | Method for realizing interactive live broadcast classroom | |
| CN103118074A (en) | Network modularization distance education training system based on extensible messaging and presence protocol (XMPP) | |
| CN103117009A (en) | Digital classroom system based on cloud storage service | |
| CN108230795A (en) | A kind of university's applied mathematics Teaching System | |
| CN101707012B (en) | Microscope experiment interactive teaching system | |
| CN106887166A (en) | A kind of wisdom learning system based on cloud platform | |
| CN101359431A (en) | PLC network television teaching system | |
| CN108922281A (en) | A kind of computer laboratory instructional device based on cloud platform | |
| CN204576476U (en) | Teaching information administrative terminal system | |
| CN104680862A (en) | Remote teaching system | |
| CN202275528U (en) | Intelligent teaching system based on computer | |
| CN106302810A (en) | A kind of telelearning system | |
| CN104318816A (en) | Multi-machine joint-screen computer teaching system | |
| CN113362664A (en) | Online education system based on high in clouds multimedia teaching | |
| CN201638416U (en) | Microscopy experiment interactive teaching system | |
| CN202385093U (en) | Electrified education system with power-line broadband network | |
| CN110164212A (en) | A kind of shared interaction classroom system in cross-region space | |
| CN107749203A (en) | A kind of teaching, training cut-in method | |
| CN107909874A (en) | A kind of multimedia interaction tutoring system and its implementation | |
| CN107734349A (en) | Based on P2P net cast team teaching systems | |
| Kritpolviman | Analysis of equipment systems, tools, and telecommunication engineering management for supporting distance learning systems via electronic media, Sukhothai Thammathirat open university: System prototype and implementation | |
| CN208922163U (en) | A kind of wisdom classroom | |
| CN209607021U (en) | A kind of networked teaching platform based on big data digging technology | |
| CN202110681U (en) | Trans-medium multimedia interactive training system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Open date: 20090204 |