Ive heard both of these terms and i am still having trouble to understand what is the difference between these two. As far as i understood, the only difference between discrete and discretized signal, is the x axis of it, for example if i have a single dirac at the $\Omega_0$ frequency it is considered to be discretized signal if its x axis has $\Omega$ as a variable

However, if we want to make this a discrete signal, we need to somehow manipulate the value on the x-axis (normally we should have n at the x axis if we want to have discrete signal).

I hope that question wasn't confusing. Any help appreciated!


What if i have a discretized signal, how am i supposed to make discrete signal out of it?


Not 100% sure I understand the question but it seems to be just a confusion of terms.

Discrete: A discrete time signal is one that is only defined at integer indices. Like you said, usually the notation for these indices are $n$.

Discretize: A discretized signal is one that is made to be discrete time. For example, if you have a continuous time signal, $x(t)$, and you sample it at some sampling period, $T$, you have discretized the signal and now have the discrete time signal $x[n]$.

  • $\begingroup$ I see, but what to do when i have a discrete frequency domain signal and i want to have discrete signal. Like, i have an infinite sum of dirac pulses in frequency domain and i have $\Omega$ at the x axis, how can i turn x axis in that case to be $n$? $\endgroup$
    – cdummie
    Jun 10 '19 at 18:32
  • $\begingroup$ You are wanting to go from the frequency domain to the time domain. This is done by the inverse discrete time fourier transform. Check out this pdf: pfister.ee.duke.edu/courses/ece485/dtft_table.pdf. It has the equations at the top and we often use these tables for the common ones like an impulse train as you described. $\endgroup$
    – Engineer
    Jun 11 '19 at 18:14

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.