取样信号:(0=10610)=1∑6(=k7) k= ∑f(k7)(-kn) 拉氏:￡[(=∑/(k7)(-k7) k -KL2取样信号: fs (t)=f(t) δT (t)=f(t) = 拉氏: £[fs (t)]= =  ( )  =− − k  t k T  ( ) ( )  =− − k f k T  t k T  ( ) ( )]  =− − k f k T  t k T  ( )  k=− f k T -kTs e