Question

信号与系统:u(1-t)的傅里叶变换,

Answer 1

根据傅立叶变换的性质来挨着套,注意,必须按照自变量变换的顺序来

u(t)----------------------------------u(t+1)------------------------------------------------u(-t+1)

U(w)=1/jw+Pi*Delta(w)----------U2(w)=U(w)e^jw-----------------------------------U3(w)=U2(-w)=U(-w)e^-jw=e^-jw(-1/jw+Pi*Delta(w))