拉氏变换与傳氏变换的吳票 f(te ot 0 因果 乘裹减因子「PO f() e(a+/) e S=O+/ f(te -(0+1O S=0+10 f(test t< o f(te s dt f(t)=o拉氏变换与傅氏变换的关系   − − f t e dt jt ( ) 因果 ( )   0 乘衰减因子 t e − f t e dt j t   − + 0 ( ) ( )   s = + j   − 0 f (t)e dt st   − − f t e dt st ( ) s = + j f t e dt j t   − −( + ) ( )    = 0 f(t) 0 t 0 = 