第五章|连续时间信号的数字处理 理想采样在频域的表示 x()→X()=jxt p(1)=∑6(-m7)eP(92)=∑0(2-jk2) 一0 式中,2,=2z/T7一抽样角频率( radians/s (t)=x,(ts(t )<X(2)=X(八92)*P(j2) P 丌 ∑ 丌 X,(Q2-jk 注:(()+6(0)=8(0+()=_()(-r)r=八( 数字信号处理精品课程理想采样在频域的表示      =−  =−  =−  =− −  =  − =   =     = = −   =  −    = k a p a p a s k s n t j t a a a T X j j k T x t x t s t X j X j P j T radians s j j k T p t t nT P j x t X j x t e dt ) 2 ( 1 ( ) ( ) 2 1 ( ) ( ) ( ) ( ) 2 / / . ( ) 2 ( ) ( ) ( ) ( ) ( ) ( )       式中， — 抽样角频率（ ） ( ) ( ) ( ) ( ) ( ) ( ) ( )       =  = − =   − 注： f t  t  t f t   f t  d f t