83.1 Discrete-Time Fourier Transform Example-The dtFT of the unit sample sequence 8n is given by △(e)=∑8[neon=8O]=1 Example- Consider the causal sequence x[n]=a"u[n]a<1§3.1 Discrete-Time Fourier Transform • Example - The DTFT of the unit sample sequence d[n] is given by ( ) = d[ ] = d[0] =1 −   =−  j n n j e n e x[n] =  [n],  1 n • Example - Consider the causal sequence