83.1 Discrete-Time Fourier Transform · Its DTFT is given by 1= n=o e on X(e/0)=∑ un]e j=∑a ∑(oe-)=.1 0 1-ae o ae Jo=a <1§3.1 Discrete-Time Fourier Transform • Its DTFT is given by =   =   = −   =−  −  0 ( ) [ ] n n j n n j n j n X e n e e −  −  = −  =   = j e n j n e 1 1 0 ( )  =  1 − j as e