第五章|连续时间信号的数字处理 X2() 2x/TP(2) X2(9) 0>29 X2(八g (93<29x) 数字信号处理精品课程    - N N X ( j ) a     - 0 2 ( ) s s   π/T P j ( 2 ) ( ) N a X j  <        s s N N s - - T 1   ( 2 ) - - ( ) T 1 s s N N s N a X j  >         