离散时间、连续频率的傅氏变换 序列的傅氏变换 (m1 x()成X( jQ2T -T0T 2T 丌 正:X(e iQ2T )=∑x(nm)en2 反:x(m1)1r9,12 X(三.离散时间、连续频率的傅氏变换 --序列的傅氏变换   =−  −  = n j T j n T 正: X (e ) x(nT)e x(nT) T -T 0 T 2T t 0 T s 2  =  ( ) ( ) j j T X e X e  或  --- ---   −     = / 2 / 2 ( ) 1 : ( ) s s x nT X e e d j T j n T s 反