# Variable notation for DTFT?!

by Jammin_James
Tags: dtft, notation, variable
 Sci Advisor PF Gold P: 2,085 $$\Omega$$ 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).