Is there a discrete signal which isn't discrete in time (rather, discrete in at least one other thing which isn't time)?

If so please share a typical example.

  • $\begingroup$ Well, technically... $\endgroup$ Commented Mar 22, 2022 at 9:53
  • $\begingroup$ As far as I am aware, when someone refers to a signal being discrete, it means that it has been discretised in time. This means that there can't be a discrete signal which is not discrete in its temporal variable. Of course, this is based on this definition... $\endgroup$
    – ZaellixA
    Commented Mar 22, 2022 at 11:10
  • $\begingroup$ Sure. Every signal that's periodic in time is discrete in frequency. $\endgroup$
    – Hilmar
    Commented Mar 22, 2022 at 11:26
  • $\begingroup$ @Hilmar periodic in time = discrete in frequency. Hmm a nice way to put it. It appears often, and hence not continuously frequent. Okay, I think I get it. $\endgroup$
    – yaraklis
    Commented Mar 22, 2022 at 11:59

1 Answer 1


Any signal that repeats in time will be discrete in frequency (meaning have non-zero values only at discrete intervals). The time domain waveform can be continuous or discrete which is independent of its Fourier Transform of being continuous or discrete. I expand on this with examples at this similar post here.

Reaching here, but we could consider antenna arrays as an example using signals with a source that is discrete in space.


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