外文文獻及翻譯-基于systemview軟件的電子專業(yè)課程的教學(xué)方法研究-教育教學(xué)(完整版)
【正文】 0Hz respectively, and each has different initial phase and amplitude. Its expression is as follows: ? ? ?????? ???????? ??? ????? 302s i n32202s i n2102s i n1 tttf The establishment of emulation model with Systemview can be shown as Figure 1. Figure 1. Emulation Model of the System The result of emulation in time and frequency domains of the signal f1(t) is shown in Figure 2. Figure 2. Signal f1(t) and its spectrum So we can see that if the signal is posed by different frequency, different phase and different amplitude sinusoid, it is difficult to find out which signals are being posed in timedomain, but we can clearly read out the frequency and scope of every ponent signals from its spectrum. Figure 3 and Figure 4 show 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, 6 the more frequency ponents contain and the smaller the amplitudes are. Figure Impulse with the Pulse Width of and its Spectrum Figure Impulse with the Pulse Width of and its Spectrum This parison 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 study. 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. 4. Conclusion 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 electrical 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 teaching materials into multimedia courseware, so as to enhance students’ sensory perceptions and improve their understanding abilities about the theories they have learned. The emulation experiments of the courses can be carried out actively. In EDA puter classrooms, by using SystemView software students can be encouraged to create the emulation systems, set system parameters, and choose analysis methods by themselves s
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