Find the frequency vector using pwelch function

2022 5 24
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更新时间：2022 5 24
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Hi all,
I have a seismic signal recorded at 200 Hz. I want to use the pwelch (using a hanning window) to find the spectra but for some reason the frequency vector is wrong (or, altenratively, I don't intepert it correclty).
For example, with 200 Hz sampling frequency, I am supposed to observe frequency range from 0 to 100 Hz in the x axis using the command:
plot(f,10*log10(pxx))
I would appreciate your help!
(please se attached seismic vector)
Thanks!
Ron

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回答（1 个）

Hiro Yoshino
Hiro Yoshino 2022-5-24

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Did you pay attention to the Normalized Frequency?
The Power Spectral Density is estimated on the frequency. Its unit is Rad/sample.

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