CN101958058B - A digital classroom teaching system - Google Patents

Abstract

The present invention relates to the application of information technology in the field of education, and in particular to a digital classroom teaching system. The present invention creatively builds the basic framework of a digital classroom teaching system through an electronic dual-board system to solve the shortcoming that the display area of the existing electronic whiteboard is too small. The electronic dual-board system consists of three parts: an electronic input display device, a control processing device, and a projection device: the electronic input display device is responsible for receiving the user's input information and displaying resources, and it consists of two electronic whiteboards; the control processing device consists of an electronic whiteboard control module, a host and other hardware and software devices, which are responsible for the positioning of the electronic whiteboard and communication management; the projection device consists of a dual-interface graphics card (connected to the host) and two projectors, and its function is to project the picture information onto the whiteboard with a suitable effect. Here, a single graphics card can also be used in conjunction with special equipment to realize the projection of a single screen to a dual screen.

Description

A digital classroom teaching system

technical field

The invention relates to the application of information technology in the field of education, in particular to a digital classroom teaching system.

Background technique

Regardless of basic education or higher education, the classroom is the main place for teacher teaching, student learning and teacher-student communication. From the perspective of technological development, the classroom has roughly experienced two stages: CLASSROOM0.0 and CLASSROOM1.0. , that is, traditional classrooms and multimedia classrooms.

The traditional classroom is a classroom with blackboards and desks in the traditional sense. At this stage, teachers prepare lessons before class, write on the blackboard during class, and use teaching aids to display specific content. Its advantage is that the teacher can better show the derivation process of the problem to the students through blackboard writing, guide the students' thinking, and at the same time ensure the continuity of the teaching content when writing; the disadvantages are that the information capacity is small, the means of expression is single, and the dust pollution is serious wait.

In the CLASSROOM1.0 stage, the classroom teaching method has undergone tremendous changes compared with the CLASSROOM0.0 stage. Teachers are gradually getting used to the human-computer interaction method based on the mouse and keyboard, and use MSOffice, multimedia players and other software to carry out teaching content in the classroom. exhibit. This kind of teaching method can make abstract knowledge intuitive and visual, and at the same time greatly save the time for teachers to write on the blackboard when teaching, increase the information capacity of classroom teaching, and improve teaching efficiency. The use of multimedia classrooms also avoids dust pollution. The emergence of electronic whiteboards provides a new way of human-computer interaction for multimedia classrooms. And to a certain extent, the blackboard writing activity was brought back to the classroom.

The shortcomings of the current multimedia classrooms are (1) the inability to combine the multimedia display function with blackboard writing activities, the lack of process derivation in teaching activities, and the lack of coherence in operation methods; (2) the software functions are not suitable for teaching, and the lack of teaching resources The display method lacks front-to-back comparison, which cannot guarantee the continuity of students' thinking; (3) The multimedia equipment is scattered and independent, and the operation method is complicated and cumbersome.

Contents of the invention

The present invention mainly solves the technical problems existing in the existing technology of building the hardware basic framework of the digital classroom teaching system, etc., and provides an electronic whiteboard technology that utilizes the existing electronic whiteboard technology to achieve mutual communication between whiteboards, thereby on the one hand integrating traditional multimedia The human-computer interaction method based on the mouse and keyboard in the classroom is transformed into a "blackboard writing" human-computer interaction method. On the other hand, it ensures that the system can have a large enough space for information display. A digital classroom teaching system.

The present invention mainly solves the existing problems in the prior art that the multimedia display function cannot be well combined with blackboard writing activities, the lack of process derivation in teaching activities, and the lack of coherence in the operation mode; the software function is not suitable for teaching, and the display mode of teaching resources is lacking. Before and after comparison, the continuity of students' thinking cannot be guaranteed; the multimedia equipment is scattered and independent, and the technical problems such as complicated and cumbersome operation methods provide a way to create a teaching software platform that develops functional modules suitable for teaching and integrates them into a whole. software framework. The software platform cooperates with the hardware framework to solve the shortcomings of the multimedia classroom mentioned above.

Another purpose of the present invention is to cooperate with the teaching software platform to establish a teaching platform usage mode suitable for classroom teaching activities.

Above-mentioned technical problem of the present invention is mainly solved by following technical scheme:

A digital classroom teaching system is characterized in that it includes: an electronic input display device, a control processing device and a projection device connected in sequence; wherein,

Electronic input display device: composed of at least one electronic whiteboard, used for users to operate software or write teaching content;

Control processing device: used to process the software operation or teaching content written by the above-mentioned users, and convert the processing results into signals and send them to the projection device;

Projection device: used to receive the signal transmitted by the control processing device and output the image to the above-mentioned electronic whiteboard.

The present invention creatively constructs the basic framework of the digital classroom teaching system through the electronic double board system, so as to solve the shortcoming that the display area of the existing electronic whiteboard is too small. The electronic double-board system is composed of three electronic input display devices, control processing devices, and projection devices: the electronic input display device is responsible for receiving user input information and displaying resources. It is composed of two electronic whiteboards; the control processing device is composed of electronic The whiteboard control module consists of a host computer and other software and hardware devices. This part is responsible for the positioning of the electronic whiteboard and communication management; the projection device is composed of a dual-interface graphics card (connected to the host computer) and two projectors. Project onto the whiteboard with the appropriate effect. Here you can also use a single graphics card with special equipment to realize the projection from single screen to dual screen.

In the above-mentioned digital classroom teaching system, the control processing device includes an electronic whiteboard control module for controlling the above-mentioned electronic whiteboard, and a host connected to the electronic whiteboard control module.

In the above-mentioned digital classroom teaching system, the specific operation steps of the electronic whiteboard control module are as follows:

Step 201: Initialization of the electronic input display device, specifically including the connection of the two electronic whiteboards to the host and the coordinate positioning of the electronic input display device;

Step 202: the electronic whiteboard control module continuously monitors the corresponding ports of the two electronic whiteboards;

Step 203: Once a click event is generated in the sensing area of the electronic whiteboard, the electronic whiteboard immediately sends the coordinates X0 and Y0 of the whiteboard where the event occurred to the electronic whiteboard control module, and the electronic whiteboard control module receives X0 and Y0, and sends the message through the port receiving the message Determine the ID number K of the electronic whiteboard that generates the event;

Step 204: the electronic whiteboard control module uses X0, Y0, K, and performs mapping calculation from the whiteboard coordinates to the operating system window coordinates according to the size of the operating system window, and finally obtains the corresponding system window coordinates X1, Y1;

Step 205: the electronic whiteboard control module converts the event in the whiteboard into a system mouse event occurring in X1 and Y1, and the control processing device responds to this event;

Step 206: After the response is completed, the projection device divides the resulting image into two parts and projects the image onto the electronic input display device.

In the above-mentioned digital classroom teaching system, the control processing device further includes a user platform calling module connected with the above-mentioned host.

In the above-mentioned digital classroom teaching system, the user platform calling module includes a window factory unit and a window management unit connected in sequence; wherein,

Window factory unit: used to create and destroy child windows with specific functions;

Window management unit: used to manage various sub-windows created.

In the above-mentioned digital classroom teaching system, the window factory unit includes a general function window subunit, a teaching software interface subunit and an interactive window subunit connected in sequence; wherein,

General function window subunit: used to call third-party software functions commonly used by users;

Teaching software interface subunit: for teaching software compatible with specific subjects;

Interactive window subunit: used for matching with external devices.

In the above-mentioned digital classroom teaching system, the third-party software commonly used by users includes OFFICE, PDF, Web browser and multimedia player, and the teaching software for specific subjects includes mathematics auxiliary teaching software and physical experiment simulation engine .

In the aforementioned digital classroom teaching system, the software whiteboard module includes sequentially connected whiteboard writing units and writing trace retention units; wherein,

Whiteboard writing unit: used to write on the global software whiteboard or on each functional sub-window;

Writing trace retention unit: used to save the written content, and recall the saved written content according to the needs of the user.

In the above-mentioned digital classroom teaching system, the window management unit includes sequentially connected sequence management subunits, window communication management subunits and window layout management subunits; wherein,

Sequence management subunit: used for parsing XML documents in teaching sequence resource packages, locating resource files, and creating and saving resource packages;

Window communication management subunit: used for communication between sub-windows created by the window factory unit, as well as communication between sub-windows and external devices;

Window layout management subunit: used to manage the position and size of the currently running sub-window.

In the aforementioned digital classroom teaching system, the electronic whiteboard is pressure-sensitive or infrared, and the projection device is a projector.

Therefore, the present invention has the following advantages: 1. It realizes the effect of "writing at any time and anywhere", which ensures that teachers can deduce the process at any time during teaching activities, and also ensures the continuity of the operation mode; 2. The multimedia functions commonly used in the classroom are integrated into the software framework in a modular form, and the human-computer interaction mode adopts a unified window template, which greatly reduces the workload of teachers; The teaching software is integrated into the framework to provide a unified presentation of teaching resources, and provides a standard import and export format.

Description of drawings

Accompanying drawing 1 is a schematic diagram of deployment of the present invention (forward cast as an example);

Accompanying drawing 2 is the realization process of dual picture operation of the present invention;

Accompanying drawing 3 is the format standard example of classroom teaching sequence;

Accompanying drawing 4 is the functional architecture figure of user platform calling module;

Accompanying drawing 5 is the display example of user platform call module;

In the figure, there is an input display area 101, a host computer 102, and a projection device 103 in the electronic input display device.

Detailed ways

The technical solutions of the present invention will be further specifically described below through the embodiments and in conjunction with the accompanying drawings.

Example:

First of all, it should be explained that in this embodiment, two electronic whiteboards are connected to each other to form an electronic double-board system, which consists of an input display area (corresponding to the aforementioned electronic input display device), a control processing part (for the aforementioned control processing part of the device) and the screen processing part (corresponding to the aforementioned projection device) are composed of three parts: the input display area is responsible for receiving the user's input information and displaying resources, which is composed of two electronic whiteboards; the control processing part is controlled by the electronic whiteboard Module, a host computer and other hardware and software equipment, this part is responsible for the positioning of the electronic whiteboard, communication management; the screen processing part is composed of a dual-interface graphics card (connected to the computer host) and two projectors, the function is to display the screen information Projected onto the input display area with a suitable effect. Here you can also use a single graphics card with special equipment to realize the projection from single screen to dual screen.

In this embodiment, it is not limited to using two whiteboards. According to the technical solution of the present invention, three or more electronic whiteboards can be used to form an electronic whiteboard system to implement teaching. In this embodiment, two whiteboards are used. A whiteboard is attached as an example.

A digital classroom teaching system includes: an electronic double board system and a user calling platform module. Among them: the electronic input display device of the classroom teaching system is composed of the electronic input display area of the electronic double-board system: it includes two electronic whiteboards for users to operate or write teaching content; the type of electronic whiteboard has no special requirements, and the control of the teaching system The processing device is composed of the control processing part of the electronic double-board system and the user platform calling module: it is used to process the operation or written teaching content of the above-mentioned users and convert it into a signal and send it to the projection device; the projection device is composed of the electronic double-board system. The picture processing part is composed of: it is used to receive the signal transmitted by the control processing device and output the image to the above-mentioned input display device.

As shown in Figure 4, in this embodiment, the user platform calling module includes: a window factory unit: used to create and destroy sub-windows with specific functions; a window management unit: used to manage various sub-windows created ;

The window factory unit includes a general function window subunit: it is used to call the third-party software commonly used by users and common teaching functions such as software whiteboard. The third-party software commonly used by users includes OFFICE, PDF, Web browser and multimedia player. The above-mentioned teaching software for a specific subject includes mathematics auxiliary teaching software and a simulation engine for physics experiments; a teaching software interface subunit: used to be compatible with the teaching software of a specific subject; an interactive window subunit: used for matching with external devices; A window management unit: used to manage various sub-windows created;

The window management unit includes: a sequence management subunit: used for parsing the XML document in the teaching sequence resource package, locating the resource file, and creating and saving the resource package; a window communication management subunit: used for the window factory unit The communication between the created sub-windows, as well as the communication between the sub-windows and external devices; a window layout management subunit: used to manage the position and size of the currently running sub-windows.

The embodiment of the present invention is described in detail below:

The technical problem to be solved in the first aspect is how to expand the display area of the electronic whiteboard. This problem is solved by the electronic double board system. The electronic double-board system refers to a set of equipment systems composed of electronic whiteboards, hosts, and projection equipment. It consists of three parts: the electronic input display area, the control processing part, and the screen processing part: the electronic input display area is responsible for receiving user input. It consists of two electronic whiteboards; the control processing part is responsible for the positioning of the electronic whiteboard and communication management; the function of the screen processing part is to project the screen information to the input display area with a suitable effect. The specific implementation plan of the electronic double board system is as follows:

Deployment of the input display area: The input display area consists of two electronic whiteboards of the same model. There is no special requirement for the type of electronic whiteboard, either pressure-sensitive or infrared.

Positioning of the input display area: The two electronic whiteboards that constitute the input display area are managed uniformly by the control processing part. Each electronic whiteboard is assigned an ID. When the user inputs information through the whiteboard, the control processing part receives the ID of the whiteboard that sends the information and the relevant position coordinates, and uses these information to map between the coordinates of the whiteboard and the coordinates of the operating system window. Handle accordingly.

Deployment of the image processing part: the display part is composed of a dual-interface graphics card and two projectors, and the function of the dual-interface graphics card is to divide the result screen after the control processing part has processed the input information into two parts (a single graphics card can also be used with a special screen device), and each part is passed to a projector. Then each projector projects the screen onto a corresponding electronic whiteboard. The display part has no special requirements on the type of projection equipment, either rear projection or front projection.

As shown in Figure 1, the software whiteboard module is implemented by calling the operating system API, which solves the problem that the current whiteboard application software does not have a unified standard, and the software whiteboard implemented through the operating system API also has strong compatibility. The software whiteboard module mainly includes two functional units, one is the whiteboard writing unit, and the other is the writing trace retention unit. The whiteboard writing unit includes two functions, one is the global whiteboard writing function, that is, the software provides a whiteboard writing area on which users can write. And another function is that the user can freely write on each function sub-window; the writing trace retention unit means that after the user finishes writing on the blackboard, the written content can be saved at any time and displayed again when needed.

In an embodiment, the specific operation steps of controlling the electronic whiteboard of the electronic whiteboard control module are as follows:

Step 201: Initialization of the input display area of the electronic dual-board system, specifically including the connection between the two electronic whiteboards and the host computer and the coordinate positioning of the input display area;

Step 202: the electronic whiteboard control module continuously monitors the corresponding ports of the two electronic whiteboards;

Step 203: Once a click event is generated in the sensing area of the electronic whiteboard, the electronic whiteboard immediately sends the coordinates X0 and Y0 of the whiteboard where the event occurred to the electronic whiteboard control module, and the electronic whiteboard control module receives X0 and Y0, and sends the message through the port receiving the message Determine the ID number K of the electronic whiteboard that generates the event;

Step 204: the electronic whiteboard control module uses X0, Y0, K, and performs mapping calculation from the whiteboard coordinates to the operating system window coordinates according to the size of the operating system window, and finally obtains the corresponding system window coordinates X1, Y1;

Step 205: the electronic whiteboard control module converts the event in the whiteboard into a system mouse event occurring in X1 and Y1, and the user platform calls the module to respond to this event;

Step 206 : After the response is completed, the display part of the electronic dual-board system divides the resulting image into two parts and projects the image onto the electronic input display area.

The second aspect mainly solves two problems. The first is to integrate scattered and independent multimedia software into a software framework, and to provide a more unified operation method; Based on the electronic double-board system, the integration of display and blackboard writing activities in classroom teaching is further enhanced at the software level. There are two steps to solve this problem: firstly, a unified functional module is established for different multimedia functions, and each functional module interacts with the user through a window; different multimedia functions. The specific plan is as follows:

1. Customization of functional module window unit. The window template defines a unified operation method, so that users do not need to learn the operation methods of different functional software.

Second, the realization of specific functions. The unit realizes different teaching functions by calling the underlying plug-in or operating system API, and performs effect display and human-computer interaction by inheriting the window template. The units of the user platform call module are divided into three categories:

B1. General function window sub-unit: Corresponding to PPT display, video and audio file playback, software whiteboard, video capture and other commonly used functions in teaching to establish corresponding function modules.

B2. Teaching software interface subunit: At this stage, there are many teaching software for specialized subjects (such as Super Sketchpad, etc.), corresponding to these software, there are also a large number of excellent teaching resources, so the platform also provides interfaces for these specialized teaching software.

B3. Interactive window subunit. This type of window is responsible for communicating with external hardware interactive devices such as wireless tablet, Clicker, and tablet computer.

Third, the construction of the overall software platform framework. The role of the platform framework is to manage the multimedia function modules. Users can easily create, call, and destroy function windows through the platform framework, which further simplifies the operation of using multimedia functions in teaching. At the same time, the platform framework can manage the window layout and communication between windows, so that it can better cooperate with the electronic double-board system to display teaching resources, annotate, write on the blackboard and other operations.

As shown in Figure 5, the calling module of the user platform is set on the host. Among them, some basic function keys are placed on the toolbar, such as create, open, save, exit, etc., and the sequence list is responsible for displaying the process of the imported teaching sequence. In the figure, the platform software opens two functional sub-windows, which are projected onto the input display area through the display device of the electronic double-board system. The two windows can interact with each other. The specific process is as follows:

The user clicks the electronic whiteboard on the left side of the input display area, and the electronic whiteboard sends the information of the click event to the electronic whiteboard control module.

The control processing device determines that the click occurs in the area of the function window 1 through coordinate conversion, and sends the specific window coordinates and the way of clicking (such as single click, double click, etc.) to the user platform calling module.

If the function window 1 sends a message to the function window 2, the user platform calling module calls the window communication management module to send the message to the function window 2, and the function window 2 processes the message.

The projection device projects the processed result screen onto the input display area of the electronic double-board system.

In the accompanying drawing 3, 301 is the storage format of a specific link in the teaching sequence, each teaching sequence consists of several links, resource 1 and resource 2 in the link are the indexes of the teaching materials contained in the link, the software platform can Find the corresponding resource by reading the information in the index and display it. 302 is an example of a specific teaching sequence.

The third problem to be solved is:

A. On the basis of the framework provided by the teaching software platform, establish a teaching platform usage method suitable for classroom teaching activities. The workflow related to the specific work unit of this embodiment is as follows:

Dual-track teaching method based on the electronic double-board system: make full use of the two electronic whiteboards of the electronic double-board system, and present two teaching resources to students while teaching knowledge points. The specific process is as follows:

The teacher determines the two teaching resources that need to be displayed at the same time. The general function window subunit, the teaching software interface subunit and the interactive window subunit in the window factory unit create corresponding functional windows according to the type of teaching resources, and present the resources in the windows .

During teaching, the teacher can set the layout of the function window through the window layout management sub-unit according to the needs (by default, the two windows occupy half of each, that is, each occupies an electronic whiteboard area, and the teacher can also choose to exchange the positions of the two windows, or set a certain One window occupies a larger area and the other window occupies a smaller area).

Some specific dual-resource display requires the establishment of an association between resources. At this time, the window communication management subunit needs to be called to be responsible for the communication between functional windows.

After the resource is used up, the window factory unit destroys the function window created.

Specifically, there are three forms of dual-track teaching methods based on the electronic double-board system:

1. Dual resource display. It means that when teaching a certain content, the teacher can display two functional windows on the dual board at the same time (for example, one for ppt and the other for video files).

2. n->n-1 expansion. It means that when a PPT resource is displayed, the window factory creates two Office function windows, one of which is the main window and the other is the extension. The main window and the extension window display the same ppt file. When the main window displays page N of the ppt, the window communication management subunit will encapsulate the information into a message and send it to the extension window. After receiving the message, the extension window will automatically display page N-1 of the ppt. At this time, the teacher also The pages displayed in the extended window can be manually adjusted as needed, but the range is limited to pages 1 to N-1 of the ppt.

Show + write. There are two ways, one is display + comment. Users can directly write on the resource display window, that is, the window factory unit creates a function window for resource display, and at the same time creates a whiteboard writing window subordinate to it. The background of the whiteboard writing window is transparent, and the size and coordinates are consistent with the function module The cells are consistent so that when users write on the whiteboard cells, they achieve the effect of annotation. The second is to display blackboard writing, that is, the window factory unit simultaneously creates a function window for resource display and a software whiteboard writing window, and writes on the blackboard on the whiteboard writing window while displaying resources. After the resources are displayed, the user can save the writing traces through the writing trace retention unit, and display them again when necessary.

Here I will explain the advantages of the dual-track teaching method based on the electronic double-board system:

(1) In the teaching activities, two large enough display areas can be used to display different teaching content respectively, so as to achieve the mutual comparison of teaching resources, so as to ensure the continuity of students' thinking and give full play to the advantages of double coding theory (while using visual ( Image) form and language (text) form to present information can enhance memory and recognition); (2) Overcome the drawbacks of purely using PPT courseware teaching that can only be played sequentially and cannot be compared and meaningfully correlated. (3) The teaching content is presented in two windows. Both pictures and texts are rich in meaning, which promotes the cognitive construction of learners.

B. Activity-centered classroom teaching sequence. In the teaching platform, a classroom teaching is defined as a series of teaching activities, and each teaching activity corresponds to the presentation of several teaching resources, that is, teaching activities are composed of functional windows.

Standardized teaching sequence export format. The platform records the activities in the classroom teaching sequence and the resources corresponding to the activities in a unified format through XML documents, and packages the documents together with the resources. Such a resource package can be run and displayed on any computer with the teaching platform software installed, and the packaging process is as follows:

b1. The platform establishes the root node according to the theme of classroom teaching and saves it to the XML document.

b2. According to each teaching link, the platform creates corresponding sub-nodes under the root node, where the sub-nodes include: node ID, which is the position of the node in the teaching sequence; node name, which is the corresponding teaching link of the node Name; node resource index, that is, the relevant information of the teaching resources that need to be displayed in this teaching session, including: resource name, resource type, resource link, etc.

b3. The platform copies the corresponding specific resource files in the teaching sequence to the same folder, and packages the folder together with the XML document. The reading of the package is the process of parsing the XML document in the resource package and locating specific resources.

The workflow related to the specific work unit of this embodiment is as follows:

The teacher imports the teaching sequence resource package into the calling module of the user platform. The user platform calls the module to obtain the permission to use the resource package, and the sequence management subunit analyzes the document index in the resource package and establishes a visible teaching process sequence.

The teacher clicks on a link in the teaching process sequence. The sequence management subunit determines the teaching resources corresponding to this link, and sends the information to the window factory unit, and the window factory unit creates corresponding functional windows.

After the teaching of this link is finished, the teacher clicks on the next link, the sequence management subunit determines the corresponding teaching resources of this link, and notifies the window factory unit, the window factory unit hides the corresponding function window of the previous link, and creates a new function window .

After the teaching sequence is used, the sequence management subunit notifies the window factory unit to destroy all the created function windows, and releases the previously stored relevant data of the teaching sequence (number of links, resource location, etc.). The user platform invokes the module to release the permission to use the resource package.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which the present invention belongs can make various modifications or supplements to the described specific embodiments or adopt similar methods to replace them, but they will not deviate from the spirit of the present invention or go beyond the definition of the appended claims range.

Claims (3)

1. A digitized classroom teaching system, characterized in that it comprises: an electronic input display device, a control processing device and a projection device connected in sequence; wherein, Electronic input display device: composed of at least one electronic whiteboard, used for users to operate software or write teaching content; Control processing device: used to process the software operation or teaching content written by the above-mentioned users, and convert the processing results into signals and send them to the projection device; Projection device: used to receive the signal transmitted by the control processing device and output the image to the above-mentioned electronic whiteboard; The control processing device includes an electronic whiteboard control module for controlling the above-mentioned electronic whiteboard and a host connected to the electronic whiteboard control module; The specific operation steps of the electronic whiteboard control module are as follows: Step 201: Initialization of the electronic input display device, specifically including the connection of the two electronic whiteboards to the host and the coordinate positioning of the electronic input display device; Step 202: the electronic whiteboard control module continuously monitors the corresponding ports of the two electronic whiteboards; Step 203: Once a click event is generated in the sensing area of the electronic whiteboard, the electronic whiteboard immediately sends the coordinates X0 and Y0 of the whiteboard where the event occurred to the electronic whiteboard control module, and the electronic whiteboard control module receives X0 and Y0, and sends the message through the port receiving the message Determine the ID number K of the electronic whiteboard that generates the event; Step 204: the electronic whiteboard control module uses X0, Y0, K, and performs mapping calculation from the whiteboard coordinates to the operating system window coordinates according to the size of the operating system window, and finally obtains the corresponding system window coordinates X1, Y1; Step 205: the electronic whiteboard control module converts the event in the whiteboard into a system mouse event occurring in X1 and Y1, and the control processing device responds to this event; Step 206: After the response is completed, the projection device divides the result screen into two parts and projects the image onto the electronic input display device; The control processing device also includes a user platform calling module connected with the above-mentioned host, and the user platform calling module includes: A window factory unit: used to create and destroy child windows with specific functions; A window management unit: used to manage various sub-windows created; the window factory unit includes a general function window sub-unit, a teaching software interface sub-unit and an interactive window sub-unit connected in sequence; wherein, General function window subunit: used to call third-party software functions commonly used by users; Teaching software interface subunit: for teaching software compatible with specific subjects; Interactive window subunit: used for matching with external devices; the window management unit includes sequentially connected sequence management subunits, window communication management subunits and window layout management subunits; wherein, Sequence management subunit: used for parsing XML documents in teaching sequence resource packages, locating resource files, and creating and saving resource packages; Window communication management subunit: used for communication between sub-windows created by the window factory unit, as well as communication between sub-windows and external devices; Window layout management subunit: used to manage the position and size of the currently running sub-window. 2. a kind of digital classroom teaching system according to claim 1, is characterized in that, described electronic whiteboard control module comprises: A whiteboard writing unit: used for writing on the global software whiteboard or on each functional sub-window; A writing trace retention unit: used to save the written content, and call the saved written content according to the needs of the user. 3 . A digital classroom teaching system according to claim 1 , wherein the electronic whiteboard is pressure-sensitive or infrared, and the projection device is a projector. 4 .

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