Timeline for How do you find the phase of the DFT of a discrete signal?
Current License: CC BY-SA 4.0
17 events
| when toggle format | what | by | license | comment | |
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| Mar 21, 2020 at 3:51 | comment | added | user1068636 | No problem, this was very helpful | |
| Mar 21, 2020 at 3:50 | vote | accept | user1068636 | ||
| Mar 21, 2020 at 3:50 | comment | added | Dan Boschen | But if you are asking for an example of sequence that would have an DFT that is not real, then refer again to my other question that I linked - it has all the properties of the FT they are trying to make sure you know. (Sorry if I seem like I am being cagey--- we're not supposed to do your homework for you but happy to help where you are stuck) | |
| Mar 21, 2020 at 3:46 | comment | added | Dan Boschen | Any complex or imaginary number, so j would be the simplest example. Also $5e^{j\pi/3}$ or 2 + j3 are other examples. | |
| Mar 21, 2020 at 3:44 | answer | added | Dan Boschen | timeline score: 2 | |
| Mar 21, 2020 at 3:43 | comment | added | user1068636 | @DanBoschen - I can ask a new question if you want. But just curious if you know of an example of a discrete signal whose phase is not 0 or $\pi$ ? | |
| Mar 21, 2020 at 3:40 | comment | added | Dan Boschen | If the real number is positive the phase is $0$, if the real number is negative, the phase is $\pi$. It's that simple. | |
| Mar 21, 2020 at 3:40 | comment | added | user1068636 | @DanBoschen - I am following what you are saying. But is there some general formula for finding the phase of an arbitrary list of real numbers? | |
| Mar 21, 2020 at 3:37 | comment | added | Dan Boschen | the phase of a real signal can be $0$ or $\pi$, right? Solve for the DFT and then look at the sign if they are all negative then the phase is $\pi$ | |
| Mar 21, 2020 at 3:35 | comment | added | user1068636 | If you are saying the phase is zero, then why is the answer in textbook $\pi$ ? | |
| Mar 21, 2020 at 3:34 | comment | added | Dan Boschen | Your signal is real and it is an even function. So the DFT is real. What is the phase of a real signal? | |
| Mar 21, 2020 at 3:33 | comment | added | user1068636 | @DanBoschen - I am not sure I see which part of the post is relevant to this question. So the answer to this question is $\pi$, but I'm not sure I see why. | |
| Mar 21, 2020 at 3:30 | comment | added | user1068636 | Sorry my mistake. Now it's even | |
| Mar 21, 2020 at 3:30 | history | edited | user1068636 | CC BY-SA 4.0 |
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| Mar 21, 2020 at 3:29 | comment | added | Dan Boschen | This post should help you: dsp.stackexchange.com/questions/38544/… | |
| Mar 21, 2020 at 3:28 | comment | added | Dan Boschen | What you show is not an even signal, did you mean x(n) = {1,2,-3,2,1}? | |
| Mar 21, 2020 at 2:22 | history | asked | user1068636 | CC BY-SA 4.0 |