z-Transform If we let z=re/o. then the z-transform reduces to G(reJu) noyon ∑gne 1=-00 The above can be interpreted as the dtFt of the modified sequence gin]r") For r=l(i.e,==1), z-transform reduces to its dtft, provided the latter exists 4 Copyright C 2001, S K MitraCopyright © 2001, S. K. Mitra 4 z-Transform • If we let , then the z-transform reduces to • The above can be interpreted as the DTFT of the modified sequence • For r = 1 (i.e., |z| = 1), z-transform reduces to its DTFT, provided the latter exists  = j z r e =   =−  − −  n j n j n G(r e ) g[n]r e { [ ] } n g n r −