2.位移性质 [f(t±o)=e1/0.%Lf(t)(1.15) 证由傅氏变换的定义,可知 +OO Af(±)=f(±t)edt (令t士10=1)=「f(u)elod e-p。f(l-d=cm,[( 同理有 [F(O千O0)=f()e05 2. 位移性质 [ ( )] [ ( )] (1.15) 0 0 f t t e f t j t F F  w  = j t t u t u t t F f t f u u f t t t u f u u f t t f t t t 0 0 0 0 [ ( )] ( ) e e ( ) e d e [ ( )] ( ) ( ) e d [ ( )] ( ) e d 0 1 j j j j ( ) 0 j 0 0 w w w w w w w w -   + -  - + - - + - - = = =  = =  =       F F F 同理有 令 证 由傅氏变换的定义, 可知