阐述创新实践教室电源系统的管理需求,选用智慧断路器模组作为网络智能终端,API Cloud平台开发,设计跨平台移动App,后端Flask配置MySQL数据库,存储记录电力数据并转发.

高校多媒体教室用的投影灯泡是使用和更换比较频繁的昂贵耗费品,需要一个能及时掌握投影灯泡运行时间的方法.文中利用面向云服务的编程思想,并以网络中控升级改造为契机,实现了投影灯泡运行时间累计计时、设限触发、消息推送、采购报送等一系列主动更新的全过程.实践表明,以此方法实现的投影灯泡主动更新,为多媒体教室设备管理和维护提供了新颖的方法.

The infrared control functions of multimedia teaching equipment have been highly restricted since the valid distance of the infrared properties is only 10 meters. In this study ,the technique of wireless transceiver communication is used ,which could penetrate the barriers. Therefore ,the limitation of short distance for the infrared control can be avoided. Furthermore ,the infrared coding of the teaching equipment can be interpreted by using self-learning mode. So the conversion from wireless coding to infrared coding will be realized and a seamless integration of teaching equipment and middle control can be achieved further. It has been demonstrated practically that technique of the wireless transfer infrared is an effective way for upgrading of the teaching facilities .

Using an AVR controller for Channels Searching/Listening and Locking improved the application of wireless microphone which is currently based on random RF protocol.Established the concises wireless communication protocol stack to achieve public RF to private RF conversion.Design the data frame of lightweight computing to reduce the amount of data processing and synchronization requirements to improve sound quality and reduce power consumption.As aresuclt of using integrated receiver-transmitter workflow that takes the channel searching/listening and locking as a core soft module with CodeVisionAVR,the transmitter and receiver of wireless microphone is automatically connected without the interference from devices with the same frequency.It shows from the application of the improved wireless microphoue that it is suitable to be used in teaching buildings with many classroom.

In order to reduce the multimedia classroom equipment failure to the teaching the influence, correctly and analyzed the fault, to relieve the breakdown fast, this article analyzes introduced the liquid crystal projector common fault and the fast overhaul logical flow.

It is desirable to study further on random matching of wireless microphone and receiver in a teaching building with many multi-media classrooms.The methods of random matching are summarized briefly such as technique of infrared carrier demodulation audio,infrared transmitted carrier frequency information,auto setup non-interference carrier frequency and random RF protocol self-adaptive frequency hopping and so on.Furthermore the advantages and disadvantages of these techniques are discussed in different situations.Finally,the suggestions to choose wireless microphones and receivers in multi-media classroom are proposed.

A true random number is combined by software and hardware,with which new random RF protocol can be produced.At the same time,through controlling of RF power,transformation of sender and receiver is completed from public RF protocol to new random RF protocol,and random matching of wireless microphone and receiver is realized.The implementation of project shows that the random RF protocol is a good method to realize random matching of wireless microphone and receiver.

It is still desirable to study and develop remote control on the projector in miniature or scattered multimedia classroom.The basic characteristics of Windows service is elaborated in this paper,and the communication protocol between network data frames and serial interface data frames is ananlyzed,and the software design process based on Windows service is discussed.Furthermore,a solution with zero-cost of the remote control on projector has been put forward when there is no availability of central network control.The method of remote coldstart-on and postpone-off of projector has been introduced at the same time.The data communication based on Windows service is innovative points.The advantage of this technique in some special application has been illuminated.

从基于RC振荡电路、晶体振荡电路到石英锁相环频率合成电路的无线话筒,目前在多媒体教室应用中仍然是主流。但在多媒体教室密集的教学楼或区域紧凑的教室群,现有技术的无线话筒显然不能满足应用需求。为此,文中进一步介绍了有线(移频)话筒、可调频率无线话筒、红外线无线话筒等过渡性技术,并阐述了收发双方实现任意配对自适应跳频无线话筒的技术方案。最后,通过技术比较表明收发双方都实现任意配对技术功能的无线话筒是目前多媒体教室无线话筒的技术发展趋势。

Multi-Classroom network teaching has already become an indispensable teaching form in university gradually, and the VGA data collection is the key technique foundation of multi-classroom network teachings. In this paper, three kinds of collection method are firstly introduced: VGA to AV, VGA software screenshots and special VGA hardware acquisition card, and the advantages and disadvantages of these techniques in network teaching are indicated, and forward more the VGA hardware card in the multi-media classrooms network teaching typical application is put forward. Finally, the VGA hardware card by DSP, is the main technique of network teaching for the future.

It is desirable to be further studied topic,which develops remote control of Windows service based on PC computer. The basic characteristics of the Windows service and development process are elaborated,the communication protocol between network interface and serial interface and its software design process are analyzed.Furthermore,a solution with ‘zero-cost’ of communication between network interface and serial interface is presented that takes PC computer as the main body in the remote control application of multi-media classrooms network integration.The special advantage of this technique is illuminated.

The data communication of "the Last 10-Meter" in the network correspondence should be currently worthy to be studied. The standard protocol of the embedded Web Service that takes ARM9 as core and the nonstandard protocol is erplained briefly that a pair nRF chip transceiver carray out, solving the protocol conversion of "the Last 10-Meter" data communication; The electric circuit design of the network power supply and the fire power supply is also provided, the power problem used in typical example on the spot is solved. Finally the advantage of these novel techniques in real application is diseussed.

With the appearance of various heterogeneous network terraces lined with the embedded equipments, the limits based originally on the embedded Web Server becomes the bottleneck of technique to be solved urgently. With the thought of services-oriented programming, the embedded Web Service model design that takes 32-bit microprocessor as core to the embedded equipments is put forward, as a result the seamless integration between the embedded equipment system and different terrace system outside has been realized. Furthermore the typical applications of this technique model has been brought forward,and the development direction of the embedded equipments has been illustrated.

本文介绍了Smart Client技术在网络课件制作设计与开发中的具体应用,并以Smart Client的技术特征实现了网络课件功能设计与内容设计彻底分开,解决了网络课件资源的可重用性和网络课件的智能部署与自动更新。

介绍了利用现有条件对多媒体教室设备进行远程控制的改进方案。通过对目前多媒体教室设备集成控制系统的技术改进,实现了主控教室对被控教室设备在无初始电源时冷启动开机,并以次序延时关机程序来保护投影机、计算机、电动屏幕等设备,最后设计了有自己知识产权的计算机开机和关机动态连接库DLL。

首先介绍51兼容的射频SoC(片上系统)nRF9E5模块和火线处理的独特电路;然后阐述该控制系统硬件和软件的设计方法,设计符合电工安全规范的单线制射频遥控开关;最后论述该方案在实际应用中的优势。

首先介绍数字音频射频收发芯片nRF24Z1的技术特性和功能结构;然后简要地阐述音频数据传输的射频协议;进而提出基于该芯片的典型应用及射频收发控制流程,并说明非标准射频协议在数字音频射频设计中的可行性和优越性。

This paper introduced the basic requirements for wireless microphone used in multimedia classroom and the basic characteristics of wireless digital audio chip nRF24Z1.The chip is used as main part to realize the hardware design of the wireless microphone transceiver that fitted in multimedia classroom,and the transmission characteristics of digital audio flow and the control process of RF transceiver were also analyzed.Finally,the low consumption and low cost of this chip were narrated to veritfy the superiority of this wireless microphone used in multimedia classroom.