Timeline for frequency present in FFT but not in PSD
Current License: CC BY-SA 4.0
13 events
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| Mar 14, 2023 at 13:49 | comment | added | Peter K.♦ | Yes, the decibel scale on the PSD will remove doubt. | |
| Mar 14, 2023 at 2:49 | comment | added | Jdip | @DanBoschen I had noticed that and was going to mention, but the OP says "flat zero" so I figured it was something else. Eyeballing the dB values, the PSD component at 60Hz should have linear value around 1 (if constant 60Hz noise of course)... I'll add that to my answer though, as it's definitely worth mentioning | |
| Mar 14, 2023 at 1:52 | history | edited | Jdip | CC BY-SA 4.0 |
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| Mar 14, 2023 at 1:34 | comment | added | Dan Boschen | I wonder if the Welch PSD as shown is in linear magnitude while the FFT is given in dB? That isn't clear from the plot. | |
| Mar 13, 2023 at 18:19 | history | edited | Jdip | CC BY-SA 4.0 |
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| Mar 13, 2023 at 18:09 | history | edited | Jdip | CC BY-SA 4.0 |
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| Mar 13, 2023 at 18:05 | comment | added | Jdip | What do you mean you don't have that data? Can't you just disable the filter ? | |
| Mar 13, 2023 at 18:04 | vote | accept | doubleE | ||
| Mar 13, 2023 at 18:04 | comment | added | doubleE | Unfortunately I don't have that data. I can imagine it's very strong but I can't imagine it's only localized in a small window of time. | |
| Mar 13, 2023 at 17:58 | comment | added | Jdip | That's good. Now what about my other guesses? How strong is the component before filtering, and is it localized in time? | |
| Mar 13, 2023 at 17:53 | comment | added | doubleE | Thank you. Stop band attenuation is in excess of 60dB. That's why I'm puzzled. | |
| Mar 13, 2023 at 17:51 | history | edited | Jdip | CC BY-SA 4.0 |
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| Mar 13, 2023 at 17:45 | history | answered | Jdip | CC BY-SA 4.0 |