[問卦] sgn(t)的功率頻譜密度與直流成分間的關係消失
關於sgn(t)的功率頻譜密度與直流成分
問題如下:
http://imgur.com/3q93QvR
![](https://i.imgur.com/3q93QvR.jpg)
大概知道原因出在sgn(t)並非連續函數
但是不知詳細原因該如何解釋
請求各位大大幫忙解惑
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