FM和AM是啥意思？收音机是咋收到音乐的？李永乐老师讲广播信号传输 - Vidude

13 Views· 15 August 2022

FM和AM是啥意思？收音机是咋收到音乐的？李永乐老师讲广播信号传输

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如果想把一个信号发射出去
这个信号必须是高频信号
低频信号传不远
而我们的声音也好图像也好
往往都是低频信号
我们必须首先把它变成高频信号
那么这个过程就称之为调制

我们把它变成一个高频信号的振幅随着低频信号的变化而变化
这种信号就称之为调幅信号
调幅信号或者叫AM

如果我让高频信号的频率随着低频信号的变化而变化
那这种就叫调频
那就是FM

信号的传播方式
一共有三种
天波
地波
直线波

另外视频中还讲解了解调的基本原理，请大家慢慢体会
以上原理对于手机也是通用的

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