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[单选题]
设F(T)=δ(t-t0),则傅氏变换F[f(t)]=( )
A.1
B.2π
C.eiωt0
D.e-iωt0
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A.1
B.2π
C.eiωt0
D.e-iωt0
设f(t)是周期为T(T>0)的周期函数,它在一个周期(-T/2,T/2)内的函数表示式为
其中Em为正常数,w=2π/T试把它展开成傅里叶级数.
A.E(t,t0)=f(t)-f(t0)
B.E(t,t0)=E(t,t0)-E(t0,0)
C.E(t,t0)=E(t-t0);
D.Et=a+bt+ct2
A.E(t,t0)=f(t)-f(t0)
B.E(t,t0)=E(t,0)-E(t0,0)
C.E(t,t0)=E(t-t0)
D.E(t,t0)=-E(t0,t)