[理工] [通訊] 幾個問題

看板Grad-ProbAsk作者gameboy6318 (雞排)時間16年前 (2010/03/24 21:29)推噓1(1推 0噓 4→)

留言5則, 2人參與討論串1/2 (看更多)

朋友問的，不過我訊號系統快忘光了0.0，這四題應該不難@@，po這應該沒錯吧!! Find the Fourier transforms of each signal given below . Plot its amplitude and phase spectra. π (1) x(t) = -1 + sin(10πt+---) 4 ---------------------------------------------- 1 i(10πt+π/4) 1 -i(10πt+π/4) -1+---e - ---e 2 2 ---------------------------------------------- (2) x(t) = 2δ(t+1) ---------------------------------------------- -j2πf X(f) =2e ---------------------------------------------- (3) x{t} = 2sinc(2t-4) ---------------------------------------------- x{t} = 2sinc(2(t-2)) 2 f -j4πf f -j4πf X(f) = ---rect(---)e =rect(---)e 2 2 2 ---------------------------------------------- -j(4πt+π/4) (4) x(t) = 4sinc(2t)e 1.2.3是這樣嗎??第四題有人會嗎@@ -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 122.126.5.46 ※ 編輯: gameboy6318 來自: 122.126.5.46 (03/24 21:49)

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