摘要
本文设计了一种关于电磁波幅度调制与解调的物理教学实验装置,采用正弦波振荡器产生调制信号,利用多组开关和可调电阻形成阵列,模拟电子琴产生音乐声,解调部分经过检波放大并驱动扬声器发声。利用该装置配合低成本的信号源和天线,在物理课程的电磁学实验教学中使用,有利于学生学习电磁波调制和解调的工作原理,理解信号变换的全部过程,使实验具有良好的趣味性。
This paper describes the design of a physics teaching experiment on electromagnetic wave amplitude modulation and demodulation device, using sine wave oscillator to generate a modulated signal, using a plurality of switch and adjustable resistor array, analog electronic piano music produced by the detection and amplification, demodulation drive loudspeaker sound. Using this device and low cost signal source and antenna in the electromagnetism experiment teaching of physics course,it is helpful for students to learn the working principle of electromagnetic wave modulation and demodulation, understand the whole process of signal transformation, and make the experiment interesting.
作者
杨心妍
YANG Xinyan(Chengdu No.7 Bayi School, Chengdu, S ichuan 61003)
出处
《科教导刊》
2018年第3期139-140,共2页
The Guide Of Science & Education
关键词
调制与解调
物理教学
实验装置
电子琴
趣味性
modulation and demodulation
physics teaching
experimental device
electronic organ
interesting
