What to use to dynamically do spectral filtering visually?

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wolftune
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What to use to dynamically do spectral filtering visually?

Post by wolftune »

I want to have a spectrogram, have a movable filter that limits the output to a frequency range, and see it. I mean, like for videos or educational purposes, I could be seeing a part of the spectrogram being colored and the rest greyed out, and hear only that section. And I want to be able to on-the-fly move the filter around in the frequencies.

What's the best tool for this?

From what I can tell, Audacity and Sonic Visualiser are close, but I can't figure out how to easily select a frequency range and hear only that range.
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Re: What to use to dynamically do spectral filtering visually?

Post by LAM »

Hi @wolftune

An easy way is to use x42-eq, hold right click on a frequency circle and sweep through the frequencies:
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Re: What to use to dynamically do spectral filtering visually?

Post by wolftune »

That EQ does the filtering just fine, and it shows the energy levels roughly, but that's not a spectrogram like https://en.wikipedia.org/wiki/Spectrogr ... violin.png

I want that sort of spectrogram and to then have a movable filter that is operating against that visualization.
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Re: What to use to dynamically do spectral filtering visually?

Post by LAM »

wolftune wrote: Wed Dec 22, 2021 7:10 pm That EQ does the filtering just fine, and it shows the energy levels roughly, but that's not a spectrogram like https://en.wikipedia.org/wiki/Spectrogr ... violin.png

I want that sort of spectrogram and to then have a movable filter that is operating against that visualization.
Check the first button on the right, under "Spectrum", you may want to set "Hist". :wink:

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Re: What to use to dynamically do spectral filtering visually?

Post by wolftune »

Okay, that's better, it's kinda close. However, because it's live, I don't get to just have a full spectrogram that I can just look at (as I would in Audacity). Also, it's not quite the starkness I'd like where the stuff filtered out is grey or mostly gone and the stuff let through is still clear.

Any other suggestions?
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Re: What to use to dynamically do spectral filtering visually?

Post by 12strings2hands »

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Re: What to use to dynamically do spectral filtering visually?

Post by wolftune »

I have the KXStudio repos, and I can't figure out how to run the LSP spectrum analyser. It's not showing in Carla or as a command-line program.

Anyway, does the analyser do filtering? I wouldn't expect that.
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Re: What to use to dynamically do spectral filtering visually?

Post by 12strings2hands »

wolftune wrote: Fri Jan 14, 2022 12:45 am I have the KXStudio repos, and I can't figure out how to run the LSP spectrum analyser. It's not showing in Carla or as a command-line program.

Anyway, does the analyser do filtering? I wouldn't expect that.
No, it doesn't filter. You're going to have to rig up several instances and attach them together. LSP plugins also have a number of filter plugins. I never used Carla, but from the description it should run LSP plugins. LSP is around a lot. It's used in the Pulse Audio PulseEffects that run on my desktop.

Have you ever seen glBars? Amazing visualization https://github.com/DISTRHO/glBars
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Re: What to use to dynamically do spectral filtering visually?

Post by wolftune »

I haven't played with glBars looks neat.

To be clear, I'm looking for ways to at least approach the sort of thing this proprietary software does, shown in this video:
https://www.youtube.com/watch?v=UHTF1-IhuC0
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Re: What to use to dynamically do spectral filtering visually?

Post by Largos »

I think this might be what you mean. I put LSP parametric eq in front of the spectrum analyser in carla rack. I then used a hi pass and lo pass on the eq. The mode and slope settings change the steepness of the curve.
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Re: What to use to dynamically do spectral filtering visually?

Post by wolftune »

Neat, that's the right direction. I'd more wish for a tool like Audacity that could show a preloaded file vs something doing real-time processing, though both have value.

Anyway, I did finally figure out that I had some filter in Carla that was filtering out the spectrum analyser, that's why I didn't see it.
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