Get waveform mid/low/high by its self

How to get high, mid, low waveform by its self?

One option is to run your source through a filter first, and then tap the visualizer to that.

If by default you do this:

Source -> Output
    |_Visualiser tap on source

You can modify it like this:

Source ->  Mixer -> Output
    |_> Lowpass filter -> Gain (set to 0) -> Mixer -> Output
                 |_Visualiser tap on filter

The gain 0 is so you can mute the lowpass filter and not have an extra lowpassed signal going into your mix.

Won't this be for while playing. I just need to get the data.

Same idea... filter the data first, then visualize that.

I hate to ask. Is there a sample code or a rough draft I can use as reference.

It's ok to ask!
I don't know of any offline-processing examples, but somebody else might.

This might be overkill but you could check out Apple's Biquadratic filters example:
https://developer.apple.com/documentation/accelerate/applying_biquadratic_filters_to_a_music_loop

I would also recommend the filter approach - I think that is standard for multi band processing, in general. Doing an FFT, manipulating bins, and then inversing the FFT causes artifacts, from I remember reading about it. Haven't tried it myself though. I'm almost certain it would be more complicated too.

A simplistic outlook to the filter approach:
Lows = Low pass
Mids = bandpass
Highs = High pass

Looks interesting. I am researching it right now. so, I can accomplish this using vDSP

Yes, there should be accelerate functions for everything you need to do I imagine.

Going to share this here too:
https://www.mathworks.com/help/audio/ug/multiband-dynamic-range-compression.html
I had found this resource recently about crossover filters and never saved the bookmark, but luckily it was in my history :)

I agree and thanks Matt for the clear direction.
If you just need basic filtering, and are comfortable w vDSP, do your offline processing there.

Thank you very mush for pointing me to the right direction. Researching vdsp now, since I have never used it before.

No problem! Good luck

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Get waveform mid/low/high by its self #44

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Get waveform mid/low/high by its self #44

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eljeff commented on Feb 8, 2022

tegab commented on Feb 8, 2022

eljeff commented on Feb 8, 2022

tegab commented on Feb 8, 2022

eljeff commented on Feb 8, 2022

Matt54 commented on Feb 8, 2022

Matt54 commented on Feb 8, 2022

tegab commented on Feb 8, 2022

Matt54 commented on Feb 8, 2022

Matt54 commented on Feb 8, 2022

eljeff commented on Feb 8, 2022

tegab commented on Feb 8, 2022

Matt54 commented on Feb 8, 2022

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