Timeline for What is wrong with this sinc interpolation? (Zero padding in frequency domain)
Current License: CC BY-SA 4.0
8 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jan 17 at 14:28 | vote | accept | In the blind | ||
| Jan 17 at 13:10 | answer | added | Dan Boschen | timeline score: 2 | |
| Jan 17 at 7:51 | comment | added | In the blind | The problem is that this code pads 17 zeros instead of 16. But anyway, I tried this with a pure tone sinewave, and it seems to work, kind of. The interpolation sort of works, but there is a small phase difference between the interpolated signal and the original after some time passes. | |
| Jan 16 at 23:33 | comment | added | Jdip | To second @Hilmar‘s comment, Try with a pure sine wave with your f_1 frequency, you’ll see that your implementation is correct | |
| Jan 16 at 20:12 | comment | added | Hilmar | I can't tell what "number of zeros" is supposed to be but most likely the difference between your results and what you expect is spectral leakage. Your second frequency isn't in the center of an FFT bin, so you get leakage over all bins including Nyquist. If Nyquist is non-zero, zero padding in the frequency domain doesn't work without artifacts. | |
| Jan 16 at 20:00 | comment | added | Jdip | "the number of zeros is not correct": what do you mean? what do you get? and what do you expect? | |
| Jan 16 at 17:55 | comment | added | robert bristow-johnson | I dunno if it's a British thing or something else, I just wish that we would stay away from "$f(t)$" or "$F(\omega)$" or "$f$" anything so that this symbol can be reserved for "ordinary frequency". $$ f \triangleq \frac{\omega}{2\pi} $$ The only "$f(t)$" we should see is if there is an instantaneous frequency that varies with time. | |
| Jan 16 at 17:30 | history | asked | In the blind | CC BY-SA 4.0 |