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摘 要

本文首先介绍了模拟频率调制（Frequency-Modulated，FM）解调的基本原理，阐明FM调制解调是模拟调制系统中结构形式最简单，且抗干扰能力最强的一种调制方式；其次，作为信号源部分，介绍了三角波发生器的原理和制作过程，及如何将三角波发生器产生波形的频率范围设置成人耳听力的频率范围20Hz~20KHz，来充当用户的模拟信息。然后，介绍了仿真平台MATLAB，利用MATLAB对模拟频率调制解调过程进行仿真，实现了用户信息的正确解调。最后给出结论。

关键词 频率调制；三角波发生器；MATLAB仿真

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Abstract

In this paper, the fundamental principle of anolog frequency modulation (FM) and demodulation are introduced at first. FM is the simpliest structure among analog modulation system, and most powerful in anti-interference; Secondly, as the signal source, the principle of triangular wave generator and the production process are described, and how to make a triangular wave generator of which waveform frequency range is set from 20 Hz to 20KHz to act as analog input information. Then, the simulation platform MATLAB is described. Using MATLAB, FM modulation and demodulation are simulated to recover the original information signal. Finally, we make conclusions and acknowledgement in the end of this paper.

Key word Frequency-Modulated; Triangular wave generator; MATLAB

Simulation

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目 录

摘 要 ..................................................................................................................... I Abstract .................................................................................................................. II 第1章 绪论 ........................................................................................................... 1 1.1 课题背景 ...................................................................................................... 1 1.2 选题目的 ...................................................................................................... 2 1.3 研究内容 ...................................................................................................... 2 1.4 量化的技术指标 .......................................................................................... 3 第2章 FM调制解调原理 .................................................................................... 4 2.1 FM信号的调制原理 .................................................................................... 4 2.1.1 调频信号的定义及产生 ....................................................................... 4 2.1.2 直接调频 ............................................................................................... 5 2.1.3 间接调频 ............................................................................................... 6 2.2 调频信号的解调 .......................................................................................... 7 2.2.1 非相干解调 ........................................................................................... 7 2.2.2 相干解调 ............................................................................................... 9 2.3 本章小结 .................................................................................................... 10 第3章 三角波发生电路 ..................................................................................... 12 3.1 三角波发生器的原理 ................................................................................ 12 3.1.1 电路组成和工作原理 ......................................................................... 12 3.1.2 频率估算 ............................................................................................. 14 3.2 三角波发生器的设计 ................................................................................ 15 3.2.1 设计电路 ............................................................................................. 15 3.2.2 元件选择 ............................................................................................. 16 3.3 硬件调试中的问题及解决方法 ................................................................ 16 3.4 本章小结 .................................................................................................... 17 第4章 FM仿真实现 .......................................................................................... 18 4.1 MATLAB软件简介 .................................................................................... 18 4.1.1 MATLAB简介 ..................................................................................... 18 4.1.2 MATLAB的特点 ................................................................................. 18 4.2 通信仿真 .................................................................................................... 20

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