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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.

yaraklis
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  • Well, technically... – a concerned citizen Mar 22 '22 at 09:53
  • 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... – ZaellixA Mar 22 '22 at 11:10
  • Sure. Every signal that's periodic in time is discrete in frequency. – Hilmar Mar 22 '22 at 11:26
  • @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. – yaraklis Mar 22 '22 at 11:59

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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.

Dan Boschen
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