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pocketfft delivers wrong values

Hello Martin Reinecke, I have the same issue as jp21. The results of my fft with pocketfft differs from what i found in matlab. I am using: ...
Pedro Baeta's user avatar
2 votes
Accepted

What factors could affect the scale of PSD estimation?

I think the issue here is scaling. Possibly contrary to popular belief, there is not a singular method of scaling that works generically for all PSD estimates, as each PSD type estimates the spectrum ...
Baddioes's user avatar
  • 768
0 votes

transform time series different length and sampling rate with frequency domain

Consider using the Lomb-Scargle Periodogram which is useful for spectral analysis of unevenly spaced data in the time domain. Jacob VanderPlas provides an intuitive overview of the algorithm in his ...
Dan Boschen's user avatar
2 votes
Accepted

Effects of Hanning window on power

When analyzing pure tones, you’d want to calculate the power spectrum, not the PSD. I’ll answer your question first, and give you the correct power spectrum computation second. Denote by $|X|^2$ the ...
Jdip's user avatar
  • 6,030
0 votes

Channel impulse response (CIR) and OFDM relationship

The OP has set a dependence on the phase parameter $\phi_n$ with the delay parameter $\tau_n$, and from that assumption the frequency response was then derived. I don't think that restriction that $\...
Dan Boschen's user avatar
0 votes

Channel impulse response (CIR) and OFDM relationship

That "complex gain" represents a delay. And a delay is inevitable in causal systems. The shifted impulses are just there for a channel with discrete multipath components. So that "...
Ahsan Yousaf's user avatar
  • 1,533
1 vote

Looking for an online course

I'm may be biased since I am the instructor, but I highly recommend the online course "DSP for Wireless Communications" which is offered routinely through dsprelated.com and the Boston ...
Dan Boschen's user avatar
0 votes
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Extracting Musical Notes from two audio samples, then providing feedback to the second one based on first one, weekend project or need to learn more?

This is definitely possible, but not trivial if it is to be useful. There are some cantrips on the way. Even with a perfect note for note rendition on the student side, there are still differences to ...
Max's user avatar
  • 2,323
0 votes

Why i am not getting same convolution plots?

What you need to do is pad the signals properly. By padding you'll be able to extract the inner part of the circular convolution applied by the frequency domain multiplication. You may have a look at ...
Royi's user avatar
  • 19.6k
0 votes

Need help understanding FFT for timeseries analysis?

I think you are approaching this backwards. In general I would recommend Start with a mathematical model of your system Analyze that model and identify certain properties or behaviors that might be ...
Hilmar's user avatar
  • 44.6k
0 votes

Why some FFT return complex array, some - mirrored real array?

If you think of FFT as figuring out with correlation how much sinewave component is inside signal then by having 2 samples required for sine period we should have half frequency bins populated. FFT ...
Jyri Poldre's user avatar
1 vote

Axis Units for Discrete and Continuous Fourier Transform

That is by and large correct. The continuous Fourier Transform adds a $\frac{1}{\text{Hz}}$ to the original units. The discrete Fourier Transform has the same units. Some of this a matter of ...
Hilmar's user avatar
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