kHI(s)= h(tedt h(t)= (S) S乙 S 277 H(s)H(P)的差别(p208)H s e ds j h t H s h t e dt j j s t s t   +  −  −  − = =    ( ) 2 1 ( ) *. ( ) ( ) 0 *H(s)与H(p)的差别（p208)