外文文獻(xiàn)及翻譯-基于systemview軟件的電子專業(yè)課程的教學(xué)方法研究

1、<p>　　基于SystemView軟件的電子專業(yè)課程的教學(xué)方法研究</p><p>　　摘 要：在電子專業(yè)主干課程教學(xué)中，有許多抽象的數(shù)學(xué)概念和理論很難理解。本文通過(guò)仿真軟件SystemView在教學(xué)中的應(yīng)用來(lái)直觀的說(shuō)明復(fù)雜的數(shù)學(xué)公式與圖形抽象的數(shù)學(xué)概念，以加強(qiáng)學(xué)生的感性認(rèn)識(shí)，提高教學(xué)效果。</p><p>　　關(guān)鍵詞：教學(xué)方法，SystemView的軟件，仿真</p&g

2、t;<p><b>　　1 介紹</b></p><p>　　由于復(fù)雜的理論和比較抽象的內(nèi)容，與電力有關(guān)專業(yè)如自動(dòng)化、電子信息工程、電子信息科學(xué)與技術(shù)等專業(yè)的學(xué)生，??往往會(huì)發(fā)現(xiàn)一些知識(shí)很難學(xué)習(xí)，如一些重要的卷積和難點(diǎn)積分、抽樣定理等信號(hào)的頻譜分析。學(xué)生通常覺(jué)得難以理解的感官知覺(jué)缺乏，因此如果老師僅僅使用了正常的教學(xué)方法會(huì)難以獲得滿意的教學(xué)效果。有一個(gè)美國(guó)人在一個(gè)圖書(shū)館說(shuō)到：“

3、我可能會(huì)忘記我聽(tīng)到的，但我可以記得我看到并理解我做什么，”這生動(dòng)地說(shuō)明了學(xué)生參與操作的重要性，并提高感官知覺(jué)。因此，計(jì)算機(jī)仿真技術(shù)設(shè)計(jì)并進(jìn)入電子專業(yè)主干課程，可以把抽象的內(nèi)容形象化，強(qiáng)化學(xué)生的感官知覺(jué)，增強(qiáng)學(xué)生的興趣和教學(xué)效果相結(jié)合，這一些領(lǐng)域的發(fā)展，強(qiáng)調(diào)教學(xué)中的應(yīng)用理論和實(shí)踐之間的聯(lián)系。</p><p><b>　　2 仿真軟件的選擇</b></p><p>　　有

4、很多仿真軟件可以應(yīng)用到電子課程，如Matlab、PSPICE、EWB、SystemView等，它們各有其特點(diǎn)和優(yōu)勢(shì)。 Matlab是一種實(shí)用數(shù)學(xué)軟件，是一種廣泛使用的分析和計(jì)算的科學(xué)項(xiàng)目，用戶必須獲得一定的操作和編程能力。 PSPICE和EWB是優(yōu)秀的電路仿真分析軟件，它們可以提供諸如AC分析、傅立葉分析等，但其缺點(diǎn)是，他們只能在具體的電路仿真分析功能。我們最后經(jīng)過(guò)一些分析和比較后選??擇SystemView仿真軟件。 SystemVi

5、ew的是由ELANIX公司設(shè)計(jì)的可以模擬和分析一個(gè)完整的動(dòng)態(tài)系統(tǒng)可視化的軟件。憑借其信號(hào)源、接收器、操作符號(hào)和很多功能模塊，這個(gè)系統(tǒng)提供模擬和電子系統(tǒng)的探索和各功能模塊是由視覺(jué)和直觀的圖標(biāo)顯示的數(shù)學(xué)工具。使用SystemView的用戶無(wú)需編程，他們唯一需要做的是用鼠標(biāo)選擇圖標(biāo)從SystemView的庫(kù)并拖動(dòng)到設(shè)計(jì)區(qū)域。通過(guò)連接線然后建立系統(tǒng)，如線性、非線性的、離散的連續(xù)的、模擬、數(shù)字等不同的系統(tǒng)，該軟件也可用于各種線性仿真使用和非線性控

6、制系統(tǒng)。憑借其方便的操作界面，該軟件可以直觀地顯示分析結(jié)果。用戶可以很容易的修改和調(diào)試系統(tǒng)，并提供連接至VC6的端口，</p><p>　　3 SystemView在教學(xué)中的應(yīng)用</p><p>　　由于論文的長(zhǎng)度有限，這里只介紹SystemView的幾個(gè)簡(jiǎn)單的應(yīng)用。此外，它也可以輔助自動(dòng)控制原理、信息理論與編碼等這類課程的教學(xué)。作為電子專業(yè)主干課程，信號(hào)與系統(tǒng)是如信息處理、通信和控制的基

7、礎(chǔ)，它的基本概念和分析方法的理論基礎(chǔ)進(jìn)一步將被用于各個(gè)領(lǐng)域和學(xué)科的研究。對(duì)信號(hào)的時(shí)域和頻域的分析是本課程的重點(diǎn)和難點(diǎn)問(wèn)題，許多學(xué)生很難理解信號(hào)頻譜的特點(diǎn)。所以SystemView軟件可用于教學(xué)，信號(hào)頻譜下使用不同的時(shí)間域和頻域用圖形來(lái)形象的顯示系統(tǒng)的特點(diǎn)。</p><p>　　例如，信號(hào)f1（t）是由三個(gè)不同具有不同的頻率為10Hz，20HZ，30Hz的正弦信號(hào)組成，各有不同的初始相位和振幅。其公式如下：<

8、/p><p>　　SystemView仿真模型的建立的可如圖1所示</p><p><b>　　圖1 仿真模型系統(tǒng)</b></p><p>　　f1(t)信號(hào)的時(shí)間域和頻域仿真結(jié)果如圖2所示。</p><p>　　圖2 f1（t）信號(hào)和頻譜波形</p><p>　　因此，我們可以看到，如果信號(hào)是由不同

9、頻率，不同相位和不同幅度的正弦波組成，是很難找出哪些信號(hào)組成時(shí)域信號(hào)，但我們可以從它的信號(hào)頻譜清楚地讀出它的頻率和包絡(luò)信息。</p><p>　　圖3和圖4顯示了兩個(gè)不同的頻域脈沖寬度窄脈沖信號(hào)的頻譜。通過(guò)SystemView的仿真，它清楚地表明，脈沖寬度窄，越頻率成分控制和較小的振幅。</p><p>　　圖3 脈沖寬度為0.05秒的脈沖和頻譜</p><p>　

10、　圖3 脈沖寬度為0.01秒的脈沖和頻譜</p><p>　　這些比較可以幫助學(xué)生理解概念的頻譜效率，從而成立時(shí)域和頻域之間的對(duì)應(yīng)關(guān)系，為進(jìn)一步學(xué)習(xí)打下基礎(chǔ)。</p><p><b>　　4 結(jié)論</b></p><p>　　這些例子表明，在電子專業(yè)主干課程教學(xué)中，我們可以借助有強(qiáng)大的分析功能的SystemView，并利用如與電氣視聽(tīng)設(shè)備，以驗(yàn)

11、證、分析和模擬演示相關(guān)內(nèi)容的教室的投影設(shè)備。如果教師使用教學(xué)多媒體課件，他們可以把仿真系統(tǒng)和仿真結(jié)果插入到多媒體課件作為教學(xué)材料，從而提高學(xué)生的感官認(rèn)識(shí)，提高對(duì)所學(xué)理論的理解能力。該課程的仿真實(shí)驗(yàn)，可以進(jìn)行積極努力。在EDA電腦教室，使用SystemView軟件可以鼓勵(lì)學(xué)生建立仿真系統(tǒng)，設(shè)置系統(tǒng)參數(shù)，并由自己選擇分析方法，培養(yǎng)和提高學(xué)生的實(shí)踐能力和創(chuàng)新意識(shí)，為學(xué)生未來(lái)從事相關(guān)工作打下良好的能力基礎(chǔ)。</p><p&g

12、t;<b>　　5 參考文獻(xiàn)</b></p><p>　　[1] Bernard Sklar, Digital Communications: Fundamentals and Applications (second edition) Prentice Hall PTR; 2001, pp,520-558.</p><p>　　[2] Furu Zhong, Shu

13、anming Li, The Application of Emulational software of System View to Assistant the Teaching of Communication Principle Course, Journal of Gansu Lianhe University (Natural Sciences), vol.22 No.1, Jan, 2008.</p><

14、;p>　　[3] Lisheng Kang, Kefu Wang, Achieving the Phase-Loched Looping Circuit Simulation Using Systemview, Henan Science, vol.24, No.4,Aug.2006.</p><p>　　[4] Xianling Xu, Modulation and Demodulation of FM

15、Signals in SystemView, Modern Electronics Technique, vol 25, No.2, Nov, 2006.</p><p>　　[5] Weixiang Yang, Boqing Xu, The Application of SystemView in Experimentation of Communication Principle, Research and

16、Exploration in Laboratory, vol.25, No.8, Aug 2006.</p><p>　　[6] Hongmei Xu, Jianshe Xiong, Application of Computer Simulation in Communication Principle Experiment teaching. Experimental Technology and Manag

17、ement, vol.23 No.3, Aug 2006.</p><p>　　[7] Feng Wang, Hui Guo, By SystemView Software Removing Narrowband Noise from TV’s Sound, China Cable Television, Nov. 2003</p><p>　　The Teaching Method Re

18、search of Electronic Major Courses</p><p>　　Based on Software of SystemView</p><p>　　ABSTRACT：In the teaching of electronic major courses, there are many abstract concepts and mathematic theory

19、which are difficult to understand. This paper illustrates that utilizing SystemView emulation software to assist teaching can show the complex mathematic formula with intuitive graphs, and visualize</p><p>　

20、　the abstract mathematic concepts, so as to strengthen students’ perceptual knowledge and improve instructional effect. </p><p>　　KEY WORDS: teaching method, SystemView Software, emulation</p><p&g

21、t;　　1. Introduction</p><p>　　Because of the intricate theories and rather abstract contents, students who specialize in electricity-related majors such as automation, electronic information engineering, the

22、science and technology of electronic information and so on, often find difficult in studying some important and difficult points such as convolution integral, the spectrum analysis of signals sampling theorem and so on.

23、 Students usually feel unintelligible for lack of sensory perception, so it is quite hard to gain sati</p><p>　　2. The choice of emulation software</p><p>　　There are many emulation software tha

24、t can be applied to the teaching of electronic courses, such as Matlab, Pspice, EWB, SystemView and so on, and each has its feature and strong point. Matlab is a kind of practical mathematic software that is widely used

25、in the analysis and calculation of science projects, and users must gain certain operational and programming ability. Pspice and EWB are excellent circuit analyzing emulation software, which can offer functions such as A

26、C analysis, Fourier ana</p><p>　　3. The application of SystemView to teaching</p><p>　　Because of the limited length of the paper, here only the application of SystemView to the following three

27、electronic major courses will be introduced. Furthermore, it can also be used into the teaching of such course as Automatic Control Principles, The theory of Information and coding and so on. As a main course of the elec

28、tronic majors, Signal and Systems is the foundation for the further study of theories such as information processing, communications and control, and its basic concepts and </p><p>　　The establishment of emu

29、lation model with Systemview can be shown as Figure 1.</p><p>　　Figure 1. Emulation Model of the System</p><p>　　The result of emulation in time and frequency domains of the signal f1(t) is show

30、n in Figure 2.</p><p>　　Figure 2. Signal f1(t) and its spectrum</p><p>　　So we can see that if the signal is composed by different frequency, different phase and different amplitude sinusoid, it

31、 is difficult to find out which signals are being composed in time-domain, but we can clearly read out the frequency and scope of every component signals from its spectrum.</p><p>　　Figure 3 and Figure 4 sho

32、w the spectrum of the two narrow pulse signals with different pulse width in frequency domain. Through emulation by SystemView, it shows clearly that the narrower the pulse width is, the more frequency components contain

33、 and the smaller the amplitudes are.</p><p>　　Figure 3.The Impulse with the Pulse Width of 0.05s and its Spectrum</p><p>　　Figure 4.The Impulse with the Pulse Width of 0.01s and its Spectrum<

34、/p><p>　　This comparison can help students to understand the concept of spectrum effectively, so as to set up the corresponding relations between time and frequency domains and pave the way for the further stud

35、y. From these figures, we can see the whole process of modulation and demodulation directly, which is more vivid and easier to understand than single mathematic operation.</p><p>　　4. Conclusion</p>&

36、lt;p>　　These examples show that in the teaching of electronic major courses, we can make full use of the powerful analysis function of SystemView, and utilize equipments such as projection in classrooms with electrica

37、l audiovisual aids to validate, demonstrate or analyze and emulate the related contents. If teachers use multimedia courseware into teaching, they can insert the emulation system diagraphs and emulation results as teachi

38、ng materials into multimedia courseware, so as to enhance students’ se</p><p>　　by themselves so as to cultivate and improve students’ practice ability and innovation consciousness and lay a good ability fou

39、ndation for students to engage in the relevant work in the future.</p><p>　　5 References</p><p>　　[1] Bernard Sklar, Digital Communications: Fundamentals and Applications (second edition) Prenti

40、ce Hall PTR; 2001, pp,520-558.</p><p>　　[2] Furu Zhong, Shuanming Li, The Application of Emulational software of System View to Assistant the Teaching of Communication Principle Course, Journal of Gansu Lian

41、he University (Natural Sciences), vol.22 No.1, Jan, 2008.</p><p>　　[3] Lisheng Kang, Kefu Wang, Achieving the Phase-Loched Looping Circuit Simulation Using Systemview, Henan Science, vol.24, No.4,Aug.2006.&l

42、t;/p><p>　　[4] Xianling Xu, Modulation and Demodulation of FM Signals in SystemView, Modern Electronics Technique, vol 25, No.2, Nov, 2006.</p><p>　　[5] Weixiang Yang, Boqing Xu, The Application of

43、 SystemView in Experimentation of Communication Principle, Research and Exploration in Laboratory, vol.25, No.8, Aug 2006.</p><p>　　[6] Hongmei Xu, Jianshe Xiong, Application of Computer Simulation in Commun

44、ication Principle Experiment teaching. Experimental Technology and Management, vol.23 No.3, Aug 2006.</p><p>　　[7] Feng Wang, Hui Guo, By SystemView Software Removing Narrowband Noise from TV’s Sound, China