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高中物理课程中有关电磁波的调制部分,虽然说教材所涉及的内容在中学阶段不可能讲透,只能对学生作概括性的介绍,但是由于无线电的普及,学生对无线电知识都有一定的感性认识,在这样的基础上,使学生正确理解调制的意义,明确载波和调幅波的概念,初步了解调幅的原理,调幅波的发射过程以及调幅装置的示意图等,则是教学能够而且必须达到的要求。为达到以上的教学目的,除了应注意讲清楚之外,还必须做好演示实验。
Although the contents of the textbooks involved in the modulation of electromagnetic waves in high school physics courses can not be thoroughly explained in the middle school stage, they can only give a general introduction to the students. However, because of the popularity of radio, students have some sensitivity to radio knowledge On this basis, students should understand the meaning of modulation correctly, clarify the concept of carrier wave and amplitude modulation wave, understand the principle of amplitude modulation, the launch process of amplitude modulation wave and the schematic diagram of amplitude modulation device, etc., so that the teaching can and must reach Claim. In order to achieve the above teaching purposes, in addition to pay attention to make it clear, you must also do a good demonstration experiment.