性质11（对偶性）F(g(x)=f(o)→F(.f(x)=2g(-D) 8(x)R? ,f(x) ① () )o)=(o.g(x)=2元J」f(s)eds g@)=2元()ds,g-m)=2元()eds F(f(x))=Sf(s)e-j@ds=2ng(-@) 66 性质11 (对偶性 ) F ( ) ( ) F ( ) 2  g x f f x g          π ( ) 1 j ( ) ( ), ( ) ( )e d ˆ 2π sx f g g x f s s        ( ) ( ) ˆ ˆ( ) ( ) g x f x g f   ？ = 1 1 j -j ( ) ( )e d , ( ) ( )e d 2π 2π s s g f s s g f s s                j F ( ) ( )e d 2π ( ) s f x f s s g         