# Variable notation for DTFT?!

by Jammin_James
Tags: dtft, notation, variable
 P: 49 Can someone explain to me why sometimes I see the DTFT as functions of capital omegas or e^(jomega). I'm failing to see the reason.
 PF Patron Sci Advisor P: 1,998 $$\Omega$$ usually refers to continuous frequency, which is often appropriate for the DTFT. The z transform is also used heavily in DSP, and it covers the full complex plane. Use of $$exp(j\omega)$$ makes it very clear that you are evaluating the frequency response (which is on the unit circle).

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