Central control host, central control system and central control platform for multimedia teaching

Abstract

The invention relates to a multimedia teaching central control host, a central control system and a central control platform, the central control host is provided with an HDMI data interface, an HDMI data processing module, a USB device interface, a USB device data switching module and an Android master control system, and the Android master control system is connected with a master control screen and a central control screen through the USB device interface. Wherein the HDMI data processing module is used for acquiring HDMI data of external equipment through the HDMI data interface, dividing the HDMI data into multiple paths of HDMI signals, then carrying out resolution reduction processing, and outputting the multiple paths of HDMI signals with different resolutions to corresponding display screens through the HDMI data interface. And the corresponding output of the same signal picture on a 4k screen and a 1080p screen can be met.

Description

Technical Field

[0001] The present application relates to the technical field of central control product management, and in particular to a multimedia teaching central control host, a central control system and a central control podium. Background Art

[0002] Existing central control products are mainly used in conjunction with independent control panels and central control hosts. On the one hand, there are currently two main forms of control panels. One is an Android screen, which realizes the interactive interface presentation by developing an application app. The overall hardware cost is relatively high and requires an Android system, but the interface can be flexibly changed. Another type is a serial port screen, which realizes the interactive interface presentation by placing static image materials of the interface in the screen memory. This method is relatively cheap, but the interface cannot be flexibly changed, and dynamic content such as video images cannot be placed. Existing multimedia central controls basically adopt a video matrix switching solution, and its general principle topology is as follows: Figure 1 As shown in the figure, when the classroom 4k high-definition large screen and 1080p desktop display need to display the same picture content, due to the limitation of technical principles, desktop computers can only output 1080p pictures at the lowest. On the other hand, the central control host mainly uses a single-chip microcomputer system as the main control system, which is driven by functional modules such as HDMI matrix, USB hub, audio mixing, and serial port control. Although the single-chip microcomputer system is characterized by good stability and reliability, it cannot meet the application of many complex scenarios in the current smart classroom, and the subsequent functional expansion is poor. Summary of the invention

[0003] The embodiments of the present application provide a multimedia teaching central control host, a central control system and a central control podium to at least solve the problem in the related art that the same image signal cannot be output simultaneously on screens with different resolutions.

[0004] In a first aspect, an embodiment of the present application provides a multimedia teaching central control host, the central control host includes an HDMI data interface, an HDMI data processing module, a USB device interface, a USB device data switching module and an Android main control system, and the Android main control system is connected to the main control screen and the central control screen through the USB device interface; wherein,

[0005] The HDMI data processing module is used to obtain HDMI data of an external device through the HDMI data interface, divide the HDMI data into multiple HDMI signals, and then perform resolution reduction processing, and output multiple HDMI signals with different resolutions to corresponding display screens through the HDMI data interface;

[0006] The dual output ports of the USB device data switching module are connected to the fixed computer and the mobile computer respectively, and are used to obtain the device data and operation data of the external USB device through the USB device interface, and switch the device data and operation data between the fixed computer and the mobile computer for output;

[0007] The Android main control system is used to obtain a high-resolution HDMI signal image and a function control interface of the central control screen, and superimpose the function control interface onto the high-resolution HDMI signal image to obtain a composite image and output it to the main control screen.

[0008] In one embodiment, the HDMI data processing module includes:

[0009] An HDMI signal matrix module, used for dividing the HDMI data into an A-channel HDMI signal and a B-channel HDMI signal in a signal matrix manner;

[0010] A signal distribution module, used for copying the A-channel HDMI signal into two identical signals, namely a first-channel HDMI signal and a second-channel HDMI signal;

[0011] The resolution reduction module is used to reduce the resolution of the first HDMI signal and the B-channel HDMI signal to obtain a first resolution signal and a second resolution signal.

[0012] In one embodiment, the first resolution signal includes a first 4K resolution signal and a second 4K resolution signal, the second resolution signal includes a first 1080P resolution signal and a second 1080P resolution signal, and the resolution reduction module includes:

[0013] A first frequency reduction module, used for reducing the frequency reduction of the first HDMI signal to obtain a first 4K resolution signal and a first 1080P resolution signal respectively;

[0014] The second frequency reduction module is used to reduce the frequency reduction of the B-channel HDMI signal to obtain a second 4K resolution signal and a second 1080P resolution signal respectively.

[0015] In one embodiment, the HDMI data interface includes four HDMI data input interfaces and five HDMI data output interfaces; wherein,

[0016] The HDMI data input interface is respectively connected to the screen projection device, desktop, notebook and desktop secondary screen;

[0017] The HDMI data output interface outputs the first resolution signal, the second resolution signal and the composite image to the teaching screen, the central control screen and the main control screen respectively.

[0018] In one embodiment, the USB device interface includes a first USB input interface, a second USB input interface, a first USB output interface, and a second USB output interface; the USB device data switching module includes a first USB-HUB, a USB switching module, and a second USB-HUB;

[0019] Among them, the first USB input interface is connected to the first USB-HUB, and the second USB input interface is connected to the second USB-HUB; the output end of the first USB-HUB is connected to the input end of the USB switching module, the output end of the USB switching module is respectively connected to the first USB output interface and the input end of the second USB-HUB, and the output end of the second USB-HUB is connected to the second USB output interface.

[0020] In one embodiment, the first USB output interface is used to connect to a laptop computer, and the second USB output interface is used to connect to a desktop computer; wherein,

[0021] When a desktop computer is used as a user operation device, the USB switching module is used to synchronize the device data and operation data to the desktop computer; when a laptop computer is used as a user operation device, the USB switching module is used to synchronize the device data and operation data to the laptop computer; and the device data and operation data are switched and output between the fixed computer and the mobile computer.

[0022] In one embodiment, the Android main control system further includes a redirection data interface, a USB redirection interface and a screen relocation module; wherein,

[0023] The USB redirection interface is connected to the main control screen to obtain the control screen data and touch coordinates of the main control screen;

[0024] The input end of the screen relocation module is connected to the control screen data, and is used to generate a virtual touch screen according to the control screen data, capture the main control operation screen from the virtual touch screen, fit the touch coordinates into the main control operation screen, and judge whether the touch coordinates are in the windows screen. If the judgment result is yes, the touch coordinates are converted into standard touch operation data, and the standard touch operation data are sent to the redirection data interface; if the judgment result is no, the touch effect is retained in the Android system, and the touch command is exported according to the touch coordinates;

[0025] The redirected data interface is connected to the input end of the first USB-HUB.

[0026] In one embodiment, the Android main control system is also used to obtain a high-resolution video signal and output it to the LCD display of the central control screen.

[0027] In a second aspect, an embodiment of the present application provides a multimedia teaching central control system, the system comprising the multimedia teaching central control host, central control screen, main control screen and teaching high-definition display screen as described in any of the above embodiments, the central control screen, main control screen and teaching high-definition display screen are respectively connected to the multimedia teaching central control host.

[0028] In the third aspect, an embodiment of the present application provides a multimedia teaching central control podium, comprising a podium body and the multimedia teaching central control system described in the above embodiments, wherein the central control host is installed inside the podium body, and at least one of the main control screen and the central control screen is movably connected to the podium body.

[0029] The multimedia teaching central control host, central control system and central control platform provided by the embodiments of the present application have at least the following technical effects:

[0030] By setting an HDMI data interface, an HDMI data processing module, a USB device interface, a USB device data switching module and an Android main control system in the central control host, the Android main control system is connected to the main control screen and the central control screen through the USB device interface. Among them, the HDMI data processing module is used to obtain HDMI data of external devices through the HDMI data interface, and divide the HDMI data into multiple HDMI signals and then perform resolution reduction processing, and output multiple HDMI signals with different resolutions to the corresponding display screen through the HDMI data interface. This application can meet the corresponding output of the same signal picture on a 4k screen and a 1080p screen through the HDMI data processing module.

[0031] Details of one or more embodiments of the present application are set forth in the following drawings and description to make other features, objects, and advantages of the present application more readily apparent. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0033] Figure 1 It is a structural diagram of the existing central control host and control panel;

[0034] Figure 2 This is a structural block diagram of a multimedia teaching central control host in an embodiment of the present application;

[0035] Figure 3This is a schematic diagram of the connection between the HDMI data processing module and the Android main control system in one embodiment of the present application;

[0036] Figure 4 This is a schematic diagram of the connection between the USB device data switching module and the Android main control system in one embodiment of the present application;

[0037] Figure 5 This is a schematic diagram of the connection between the control panel and the Android main control system in one embodiment of the present application;

[0038] Figure 6 This is a flowchart for implementing USB redirection in one embodiment of the present application. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is described and illustrated below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. Based on the embodiments provided in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0040] Obviously, the drawings described below are only some examples or embodiments of the present application. For ordinary technicians in this field, the present application can also be applied to other similar scenarios based on these drawings without creative work. In addition, it can also be understood that although the efforts made in this development process may be complicated and lengthy, for ordinary technicians in this field related to the content disclosed in this application, some changes in design, manufacturing or production based on the technical content disclosed in this application are just conventional technical means, and should not be understood as insufficient content disclosed in this application.

[0041] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those of ordinary skill in the art that the embodiments described in this application may be combined with other embodiments without conflict.

[0042] Unless otherwise defined, the technical terms or scientific terms involved in this application should be understood by people with ordinary skills in the technical field to which this application belongs. The words "one", "a", "a", "the" and the like involved in this application do not indicate a quantitative limitation, and may represent the singular or plural. The terms "include", "comprise", "have" and any of their variations involved in this application are intended to cover non-exclusive inclusions; for example, a process, method, system, product or device that includes a series of steps or modules (units) is not limited to the listed steps or units, but may also include steps or units that are not listed, or may also include other steps or units inherent to these processes, methods, products or devices. The words "connect", "connected", "coupled" and the like involved in this application are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The "multiple" involved in this application refers to two or more. "And / or" describes the association relationship of associated objects, indicating that there may be three relationships, for example, "A and / or B" can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the objects before and after are in an "or" relationship. The terms "first", "second", "third", etc. involved in this application are only used to distinguish similar objects and do not represent a specific ordering of the objects.

[0043] In a first aspect, an embodiment of the present application provides a multimedia teaching central control host, which includes an HDMI data interface, an HDMI data processing module, a USB device interface, a USB device data switching module and an Android main control system, and the Android main control system connects the main control screen and the central control screen through the USB device interface.

[0044] Specific reference Figure 2 The HDMI data processing module is used to obtain HDMI data of an external device through the HDMI data interface, and divide the HDMI data into multiple HDMI signals and then perform resolution reduction processing, and output multiple HDMI signals with different resolutions to the corresponding display screen through the HDMI data interface; the dual output ports of the USB device data switching module are respectively connected to a fixed computer and a mobile computer, and are used to obtain device data and operation data of an external USB device through the USB device interface, and switch and output the device data and operation data between the fixed computer and the mobile computer; the Android main control system is used to obtain a high-resolution HDMI signal picture and a function control interface of the central control screen, and superimpose the function control interface on the high-resolution HDMI signal picture to obtain a composite picture and output it to the main control screen.

[0045] In one embodiment, specific reference is made to Figure 3, the HDMI data processing module comprises:

[0046] An HDMI signal matrix module is used to divide the HDMI data into an A-channel HDMI signal and a B-channel HDMI signal in a signal matrix manner; a signal distribution module is used to copy the A-channel HDMI signal into two identical signals, namely a first-channel HDMI signal and a second-channel HDMI signal; a resolution reduction module is used to downgrade the resolution of the first-channel HDMI signal and the B-channel HDMI signal to obtain a first-resolution signal and a second-resolution signal.

[0047] More specifically, the first resolution signal includes a first 4K resolution signal and a second 4K resolution signal, and the second resolution signal includes a first 1080P resolution signal and a second 1080P resolution signal. In this embodiment, the resolution reduction module includes: a first frequency reduction module, which is used to reduce the frequency division of the first HDMI signal to obtain a first 4K resolution signal and a first 1080P resolution signal; a second frequency reduction module, which is used to reduce the frequency division of the B-channel HDMI signal to obtain a second 4K resolution signal and a second 1080P resolution signal.

[0048] In one embodiment, reference Figure 3 , the HDMI data interface includes four HDMI data input interfaces and five HDMI data output interfaces, the input interfaces are: HDMI-IN4 (screen projection), HDMI-IN1 (desktop), HDMI-N2 (notebook) and HDMI-IN3 (desktop sub-screen); the output interfaces are HDMI-OUT-B1 (4K), HDMI-OUT-B2 (1080P), HDMI-OUT-A3 (1080P), HDMI-OUT-A2 (4K) and HDMI-OUT-A1 (master control). Among them, the HDMI data input interface is respectively connected to the screen projection device, desktop, notebook and desktop sub-screen; the HDMI data output interface outputs the first resolution signal, the second resolution signal and the composite picture to the teaching screen, the central control screen and the master control screen.

[0049] In a preferred embodiment, this embodiment can be designed with a HDMI matrix output signal differential resolution function, for specific reference Figure 3, the HDMI matrix module of the central control host uses a four-input and two-output signal matrix to output signals (OUTA and OUTB). The OUTA signal is transmitted to the signal distribution module to copy the signal into two identical signals, which are output to the Android main control system and the next-level signal resolution reduction module respectively. The Android main control system superimposes the function control interface on the incoming HDMI signal screen for composite output. The signal resolution reduction module loops out and reduces the resolution of this signal before outputting it, and finally realizes that one OUTA signal can be converted into three signals of different specifications: OUTA1 is the superimposed screen signal of the HDMI screen and the central control screen; OUTA2 is the 4K resolution screen signal of the HDMI screen; OUTA3 is the 1080P resolution screen signal of the HDMI screen. The OUTB signal is transmitted to the signal resolution reduction module to realize that one OUTB signal can be converted into two signals of different specifications: OUTB1 is the 4K resolution screen signal of the HDMI screen; OUTB2 is the 1080P resolution screen signal of the HDMI screen.

[0050] In one embodiment, the USB device interface includes a first USB input interface, a second USB input interface, a first USB output interface, and a second USB output interface; the USB device data switching module includes a first USB-HUB, a USB switching module, and a second USB-HUB. The first USB input interface is connected to the first USB-HUB, and the second USB input interface is connected to the second USB-HUB; the output end of the first USB-HUB is connected to the input end of the USB switching module, the output end of the USB switching module is respectively connected to the input ends of the first USB output interface and the second USB-HUB, and the output end of the second USB-HUB is connected to the second USB output interface.

[0051] In this embodiment, the first USB output interface is used to connect to a laptop computer, and the second USB output interface is used to connect to a desktop computer. When the desktop computer is used as a user operation device, the USB switching module is used to synchronize the device data and operation data to the desktop computer; when the laptop computer is used as a user operation device, the USB switching module is used to synchronize the device data and operation data to the laptop computer; and the device data and operation data are switched and output between the fixed computer and the mobile computer.

[0052] Specifically refer to Figure 4This embodiment implements the USB matrix function design with dual output ports. Specifically, two USB-HUBs are respectively provided for connecting external USB devices, each of which is defined as Group A input and Group B input. A USB switching module is added to the output end of Group B to realize the free switching of the output of Group B, supporting direct output or output to the input port of Group A. Under this design, the central control will have two USB output ports. The output of Group A is connected to the classroom desktop for the access of fixed USB devices. The output of Group B can be connected to the teacher's own laptop according to the usage. When the HDMI screen is switched to the laptop, the corresponding functions of Group B USB access, such as U disk, touch, etc., are synchronously switched from the desktop to the laptop to realize automatic switching of USB.

[0053] In one embodiment, the Android main control system also includes a redirection data interface, a USB redirection interface and a screen repositioning module. The USB redirection interface is connected to the main control screen and is used to obtain the control screen data and touch coordinates of the main control screen; the input end of the screen repositioning module is connected to the control screen data, and is used to generate a virtual touch screen according to the control screen data, capture the main control operation screen from the virtual touch screen, fit the touch coordinates into the main control operation screen, and determine whether the touch coordinates are in the windows screen. If the judgment result is yes, the touch coordinates are converted into standard touch operation data, and the standard touch operation data are sent to the redirection data interface; if the judgment result is no, the touch effect is retained in the Android system, and the touch command is exported according to the touch coordinates; the redirection data interface is connected to the input end of the first USB-HUB.

[0054] The implementation of the redirection function of the USB device in this embodiment refers to Figure 5 , an independent and dedicated USB interface USB-IN2 (redirection) is designed on the Android main control system side. The touch of the main control display can be input through this port. The Android system can compare the content of the current screen according to the click position of the teacher on the main control display. When used to click on the control interface, the touch command is converted into the corresponding central control operation command. When the content of the HDMI signal screen is clicked, the USB touch effect is redirected and converted into a new USB signal, which is transmitted to the classroom desktop or laptop through the USB-HUB interface.

[0055] The specific process of redirection is referenced Figure 6Before redirection, the Android system collects the input windows screen and fills it with a resolution of 1920*1080. The Android system overlays the control interface of the central control on the partial screen of the windows to form the main control operation screen. On the other hand, when the main control screen connected to the USB redirection interface has touch input, the Android system generates a virtual touch screen device type and connects it to the USB-HUB via USB. The Android main control system captures the main control operation screen. The touch coordinates are then fitted into the main control operation screen to obtain the specific click position; then it is determined whether the click position is within the windows screen. If so, the touch coordinates are converted into standard touch operations and output to the USB-HUB. The USB-HUB sends the touch effect to the corresponding connected device through the output port (reference Figure 4 ), so that a touch click occurs in the windows of the corresponding device, realizing touch operation relocation. On the other hand, if the click position is not in the windows screen, the touch effect is retained in the Android system, and the control command is triggered according to the click position.

[0056] In one embodiment, the Android main control system is also used to obtain a high-resolution video signal and output it to the liquid crystal display of the central control screen. Figure 5 The control panel (i.e., central control screen) is connected to the Android main control system through the USB (panel) interface, and the main control screen is connected to the Android main control system through the interface USB-main control screen Touch, and then the high-resolution video signal is transmitted to the central control screen through the interface DP-OUT (panel). In this case, one panel can be reduced during the application process, thereby realizing a dual-mode design of central control screen DP output to the display screen, supporting independent output of the complete control screen in a conventional LCD touch screen, and realizing the coexistence of dual-mode use of panel-free scenes and panel-based scenes.

[0057] In a second aspect, an embodiment of the present application provides a multimedia teaching central control system, the system comprising the multimedia teaching central control host, central control screen, main control screen and teaching high-definition display screen as described in any of the above embodiments, the central control screen, main control screen and teaching high-definition display screen are respectively connected to the multimedia teaching central control host.

[0058] In the third aspect, an embodiment of the present application provides a multimedia teaching central control podium, comprising a podium body and the multimedia teaching central control system described in the above embodiments, wherein the central control host is installed inside the podium body, and at least one of the main control screen and the central control screen is movably connected to the podium body.

[0059] The multimedia teaching central control host, central control system and central control platform provided by the embodiments of the present application have at least the following technical effects:

[0060] By setting an HDMI data interface, an HDMI data processing module, a USB device interface, a USB device data switching module and an Android main control system in the central control host, the Android main control system is connected to the main control screen and the central control screen through the USB device interface. Among them, the HDMI data processing module is used to obtain HDMI data of external devices through the HDMI data interface, and divide the HDMI data into multiple HDMI signals and then perform resolution reduction processing, and output multiple HDMI signals with different resolutions to the corresponding display screen through the HDMI data interface. This application can meet the corresponding output of the same signal picture on a 4k screen and a 1080p screen through the HDMI data processing module.

[0061] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0062] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A multimedia teaching central control host, characterized in that: The central control host includes an HDMI data interface, an HDMI data processing module, a USB device interface, a USB device data switching module and an Android main control system, and the Android main control system is connected to the main control screen and the central control screen through the USB device interface; wherein, The HDMI data processing module is used to obtain HDMI data of an external device through the HDMI data interface, divide the HDMI data into multiple HDMI signals, and then perform resolution reduction processing, and output multiple HDMI signals with different resolutions to corresponding display screens through the HDMI data interface; The dual output ports of the USB device data switching module are connected to the fixed computer and the mobile computer respectively, and are used to obtain the device data and operation data of the external USB device through the USB device interface, and switch the device data and operation data between the fixed computer and the mobile computer for output; The Android main control system is used to obtain a high-resolution HDMI signal image and a function control interface of the central control screen, and superimpose the function control interface onto the high-resolution HDMI signal image to obtain a composite image and output it to the main control screen.

2. The central control host according to claim 1, characterized in that: The HDMI data processing module comprises: An HDMI signal matrix module, used for dividing the HDMI data into an A-channel HDMI signal and a B-channel HDMI signal in a signal matrix manner; A signal distribution module, used for copying the A-channel HDMI signal into two identical signals, namely a first-channel HDMI signal and a second-channel HDMI signal; The resolution reduction module is used to reduce the resolution of the first HDMI signal and the B-channel HDMI signal to obtain a first resolution signal and a second resolution signal.

3. The central control host according to claim 2, characterized in that: The first resolution signal includes a first 4K resolution signal and a second 4K resolution signal, the second resolution signal includes a first 1080P resolution signal and a second 1080P resolution signal, and the resolution reduction module includes: A first frequency reduction module, used for reducing the frequency reduction of the first HDMI signal to obtain a first 4K resolution signal and a first 1080P resolution signal respectively; The second frequency reduction module is used to reduce the frequency reduction of the B-channel HDMI signal to obtain a second 4K resolution signal and a second 1080P resolution signal respectively.

4. The central control host according to claim 2, characterized in that: The HDMI data interface includes four HDMI data input interfaces and five HDMI data output interfaces; wherein, The HDMI data input interface is respectively connected to the screen projection device, desktop, notebook and desktop secondary screen; The HDMI data output interface outputs the first resolution signal, the second resolution signal and the composite image to the teaching screen, the central control screen and the main control screen respectively.

5. The central control host according to claim 1, characterized in that: The USB device interface includes a first USB input interface, a second USB input interface, a first USB output interface and a second USB output interface; the USB device data switching module includes a first USB-HUB, a USB switching module and a second USB-HUB; Among them, the first USB input interface is connected to the first USB-HUB, and the second USB input interface is connected to the second USB-HUB; the output end of the first USB-HUB is connected to the input end of the USB switching module, the output end of the USB switching module is respectively connected to the first USB output interface and the input end of the second USB-HUB, and the output end of the second USB-HUB is connected to the second USB output interface.

6. The central control host according to claim 5, characterized in that: The first USB output interface is used to connect to a laptop computer, and the second USB output interface is used to connect to a desktop computer; wherein, When a desktop computer is used as a user operation device, the USB switching module is used to synchronize the device data and operation data to the desktop computer; when a laptop computer is used as a user operation device, the USB switching module is used to synchronize the device data and operation data to the laptop computer; and the device data and operation data are switched and output between the fixed computer and the mobile computer.

7. The central control host according to claim 5, characterized in that: The Android main control system also includes a redirection data interface, a USB redirection interface and a screen relocation module; wherein, The USB redirection interface is connected to the main control screen to obtain the control screen data and touch coordinates of the main control screen; The input end of the screen relocation module is connected to the control screen data, and is used to generate a virtual touch screen according to the control screen data, capture the main control operation screen from the virtual touch screen, fit the touch coordinates into the main control operation screen, and judge whether the touch coordinates are in the windows screen. If the judgment result is yes, the touch coordinates are converted into standard touch operation data, and the standard touch operation data are sent to the redirection data interface; if the judgment result is no, the touch effect is retained in the Android system, and the touch command is exported according to the touch coordinates; The redirected data interface is connected to the input end of the first USB-HUB.

8. The central control host according to claim 1, characterized in that: The Android main control system is also used to obtain high-resolution video signals and output them to the LCD display of the central control screen.

9. A multimedia teaching control system, characterized in that: The system comprises the multimedia teaching central control host, central control screen, main control screen and teaching high-definition display screen as described in any one of claims 1-8, and the central control screen, main control screen and teaching high-definition display screen are respectively connected to the multimedia teaching central control host.

10. A multimedia teaching control platform, characterized in that: It comprises a platform body and the multimedia teaching central control system as claimed in claim 9, wherein the central control host is installed inside the platform body, and at least one of the main control screen and the central control screen is movably connected to the platform body.

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