[考題] 通訊系統/摺積/傅立葉轉換:－2016徵求年菜推薦網路訂購最紅的商家.年菜訂購?台北年菜外送餐廳推薦(年菜)?年菜.今年不想做年菜推薦,網路宅配哪一家好?

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[考題] 通訊系統/摺積/傅立葉轉換

Oct 31st 2013, 10:01, by TFNF

作者TFNF (帕妮飯)

站內Examination

標題[考題] 通訊系統/摺積/傅立葉轉換

時間Thu Oct 31 10:01:35 2013

http://miupix.cc/pm-VJNVJQ （a)小題沒有問題主要是想請問（b)小題為何h(t)=rect[(t-4.5)/3]可以直接做轉換為何不用簡化成rect[(t/3)-1.5]再做轉換這樣算出來的答案是3sinc(3f)e^(-j3*pi*f) 請版友幫忙謝謝 -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 101.12.137.224

推 jdtrue:因為rect[t/3-1.5]根本不是方波標準式啊 10/31 10:14

→ jdtrue:標準式長這樣：rect[(t-位移)/寬度] 10/31 10:16

→ jdtrue:如果你對波形的位移跟時域拉伸有點概念比較不會有這種疑問 10/31 10:18

→ TFNF:所以應該先做平移再做尺度變化囉？ 10/31 10:19

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