Discrete-Time Fourier Transform Example- The dtft of the unit sample sequence 8[n] is given by △(e)=∑8[ n]e=80]=1 1=-00 Example- Consider the causal sequence x[n]=a"u[n] a<1 Copyright C 2001, S K MitraCopyright © 2001, S. K. Mitra 9 Discrete-Time Fourier Transform • Example - The DTFT of the unit sample sequence d[n] is given by • Example - Consider the causal sequence ( ) = d[ ] = d[0] =1 − w  =− w j n n j e n e x[n] =  [n],  1 n