令 X()=H() 8.1-8) Y(O=S(oe (8.1-9) H(oS(o)e/oo dol 2丌 可得= (8.1-10) 4丌 ∫(o) LH(o dolls S(Oe JO/2 S(o do 4丌 O 4 根据帕塞瓦尔( Parseval)定理有 T s(a)do=s2(dt=E (8.1-1DX () = H() (8.1 - 8) 0 ( ) ( ) j t Y S e   =  (8.1 - 9) 令 可得    −  − =         H d n H S e d r j t 2 0 2 0 ( ) 4 ( ) ( ) 2 1 0 (8.1 - 10) 2 ( ) 2 1 ( ) 4 ( ) ( ) 4 1 0 2 2 0 2 2 2 0 n S d H d n H d S e d j t      −  −  −  −  =             根据帕塞瓦尔(Parseval)定理有 S d = s t dt = E    −  − ( ) ( ) 2 1 2 2    (8.1 - 11)