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Does there exist a #FOSS tool that allows me to analyze the dominant frequencies in a portion of an #audio file and to apply a filter to remove all but a specific frequency? #AskFedi

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Depending on how automated you want this to be, sox may be useful - it can certainly do the filtering, and can at least generate a spectrogram from which you can decide where to filter.

Csound can do this sort of thing more capably but using it will involve coding to define exactly what you mean.

@Matthew Skala It doesn't need to be super automated. Doing things manually is fine.
@Matthew Skala The application here, FWIW, is to extract Morse code from an audio file, because I'm not good at Morse code, and can decode it more easily visually than by sound.
https://www.sonicvisualiser.org/ is pretty powerful and might do the job.
Sonic Visualizer screenshot.


I'm getting back into designing #PCBs for fun again. Previously, I had been using #geda, but #KiCad appears to be the #FOSS tool all the cool kids are using so I guess it's time to learn that.

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