矩形脉冲信号$f(t)=u(t+1)-u(t-1)$,其傅里叶变换为F(w),则$F(n\pi)=0$,n=0,1,2,...
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$y(t)=cos(t)+\sqrt{2\pi}[\delta(t+1)+\delta(t-1)]$的傅里叶变换结果是?
A. $F(w)=\sqrt{2\pi}cos(w)+2\pi[\delta(w+1)+\delta(w-1)]$
B. $F(w)=2{\pi}cos(w)+\sqrt{2\pi}[\delta(w+1)+\delta(w-1)]$
C. $F(w)=\sqrt{2\pi}cos(w)-2\pi[\delta(w+1)+\delta(w-1)]$
D. 0
f(t)的周期为0.1,傅里叶级数系数为$F_{0}=5,F_{3}=F_{-3}=3,F_{5}=F_{-5}=2j$,其余系数为0,则此信号的时域表达式为$f(t)=5 + 6cos(60\pi t)-4sin(100\pi t)$
A. 正确
B. 错误
(1)已知某信号的傅里叶变换结果是$F(w)=2\pi[\delta(w) + \delta(w-2)]$,F(w)是y(t)的傅里叶变换,则y(0)=
A. 1
B. 2
C. 1.5
D. 0.5
(1)已知信号$y(t)=e^{-2|t|}$,F(w)是y(t)的傅里叶变换,则F(0)=
A. 1
B. 2
C. 1.5
D. 0.5