Complex z plane X(z)=∑x[n]z-n Region Of Convergence n=-00 (ROC) 乎m Z-plane unit circle Z=eio -π≤①<π Z=1 1 e Fourier transform is the z-transform at z|=1. (in most cases) 77 Complex z plane ( )   n n X z x n z  =− − =  j unit circle Z = e −      Z =1 Region Of Convergence (ROC) ◆Fourier transform is the z-transform at |z|=1. (in most cases)