Re: [理工] [通訊]-信號與系統
※ 引述《zendla (夏夜薄荷)》之銘言:
: For the following signals,determine whether it is periodic,and if it is,find
: the fundamental period:
: 3
: x(t)=sin (2t)
: Ans:Periodic,with a fundamental period of (1/π)s
: 請問大大們這題要怎麼算,已經試過兩倍角公式和三倍角了,還是弄不出來= ="
: 明天要考,拜託各位啦orz
通訊我不熟,但是好像在問周期.
如果現在沒有次方
sin2t
| 000
| 0 0
|0 0
|-------------------- <---大概會長這樣,週期:pi
0 0
0 0
000
偶次方的話會翻上來
ex:
sin^2(2t)
| 000 000
| 0 0 0 0
|0 00 0
|-------------------- <---大概會長這樣,週期:pi/2
所以週期改變了
奇次方又會有正有負,周期變回pi.
大概是這樣.
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