Questions tagged [fft]

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10 votes
3 answers

How and why do we rescale the input and/or output of an FFT for bioacoustics research?

I am plotting power spectra of echolocation clicks in R and I want to calculate the absolute magnitudes of the power spectra (not normalized dB values relative to the max). My understanding is that ...
  • 111
8 votes
2 answers

Why divide by average of window when calculating spectrum of signal?

When creating the spectrum of a signal, I understand that applying a window function can help with spectral leakage to get a more accurate picture of the frequency distribution. But sometimes I've ...
20 votes
4 answers

How does PSD accuracy change with FFT size?

I know that as FFT size is increased, spectral (frequency) resolution increases and temporal resolution decreases (and vice versa when FFT size is decreased). ...
  • 3,570
13 votes
1 answer

Wavelets Versus FFT for Cetacean Vocalizations

What would be the main advantages of wavelets, such as Daubechies, over an FFT analysis for researching cetacean vocalizations? Would one of the advantages be the exposure of micro-structures in ...
  • 601