(a)利用卷积性质和逆变换,用计算X(jω)和H(jω)求下列各对信号x(t)和h(t)的卷积:(1) x(t)=te
(a)利用卷积性质和逆变换,用计算X(jω)和H(jω)求下列各对信号x(t)和h(t)的卷积:
(1) x(t)=te-2tu(t),h(t)=e-4tu(t)
(2) x(t)=te-2tu(r),h(t)=te-4tu(r)
(3)x(t)=e-tu(t),h(t)=etu(-t)
(b)假设x(t)=e-(t-2)u(1-2),h(t)如图4-8所示,对这对信号,通过证明y(t)=x(t)*h(t)的傅里叶变换等于H(jω)X(jω)来验证卷积性质。