傅里叶变换 傅里叶级数 欧拉公式 复数

如果看了这篇文章你还不懂傅里叶变换,那就过来掐死我吧

如果看了这篇文章你还不懂傅里叶变换,那就过来掐死我吧(二)

傅里叶分析之掐死教程(完整版)更新于2014.06.06

复数的物理意义是什么?


Re{}在信号与系统中是取实部。Re\{\frac{1}{i}e^{ix}\} = sinx  (见欧拉公式)

z的共轭写成z^* (\frac{1}{2i}e^{ix})^* = - \frac{1}{2i}e^{-ix}

傅里叶级数


欧拉公式

e^{ix} = cosx + isinx 

 

\frac{1}{i}e^{ix} = \frac{1}{i}cosx + sinx

 

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