(86)--4.5.6 傅里叶变换的频移性质

第1页■▲六、频移性质(FrequencyShiftingProperty)Iff(t)←→F(jω)thenProof:where“ω0”isrealconstant.F[ejω0tf(t)]ttftjjtd()ee0ttftjd)e()(0=F[j(ω-ω0)]end()e)][j(0j0ftFtForexample1f(t)=ej3t←→F(jω)=?Ans:1←→2πδ(ω)ej3t×1←→2πδ(ω-3)Example2