2022-10-02

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用公式手推傅里叶变换搞多了，现在写点代码看看。

前置内容：🔗 [2022-09-04 - Truxton's blog] https://truxton2blog.com/2022-09-04/#计算机程式的DFT分析

先在公式推导层面探讨一下 实信号 的频谱特点。

提醒：去昨天的笔记里补充sin(wt+phi)的狄拉克函数

提醒：补充一些DFT公式的推导