Fun with Continuous Wavelet Transform Spectrograms

spectrograms.ipynb

First of all, thank you all for sharing this material. It's being extremely useful for me!
I have slightly modified this code to adapt it to my case of study and I'm wondering if, with regards to CWT, I could visualize period instead of frequencies in the output image. Although it's being a little hard for me to enter into waveletes world, I think I'd have to make a deeper change beyond invertis y-axis, isn't it?
I'd really appreciate someone's aid. Thank you very much in advance.
Kind regards,
Miguel González-Jiménez

Hello Miguel, Sorry it has taken me so long to respond. I am pleased you found my codes useful. Wavelets have a scale, not a wavelength and frequency is a pseudo frequency which is something like the center frequency of the waveform. This link below talks about this some. I think it is still useful for us to cast the wavelet transforms in these fourier terms to help us better understand what they are telling us. I hope that this brief response helps. Steve https://stackoverflow.com/questions/58166010/how-to-convert-scales-to-frequencies-in-wavelet-transform

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On Thu, Jan 14, 2021, at 10:16 AM, MiguelonGonzalez wrote: ***@***.**** commented on this gist. First of all, thank you all for sharing this material. It's being extremely useful for me! I have slightly modified this code to adapt it to my case of study and I'm wondering if, with regards to CWT, I could visualize period instead of frequencies in the output image. Although it's being a little hard for me to enter into waveletes world, I think I'd have to make a deeper change beyond invertis y-axis, isn't it? I'd really appreciate someone's aid. Thank you very much in advance. Kind regards, Miguel González-Jiménez — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <https://gist.github.com/7654032c64370672b933559f887afd56#gistcomment-3593873>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AK3OJA3Q46XOM22Z7BFB2K3SZ4DFDANCNFSM4WCSRTUQ>.

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Hi Steve!
Thank you for your response and that web-link, it's been helpful. I have already tunned your code: what I did finally was obtained the periods just by inverting the frequencies array, and then I plotted them on a log2 scale image for a better visualization.
What I'm hesitating right now is if, somehow, I could plot the arrows in the output XWT image using some of the functions you have programmed, like xwt_phase, so as to obtain a graphic like the one attached.
Thank you again! I hope you're fine.
Miguel