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The filters #30
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@redtide edited. |
Here, I implemented the Hal Chamberlin state-variable filter. Reference: https://www.earlevel.com/main/2003/03/02/the-digital-state-variable-filter/ As noted from the article:
It means if we want to permit range up to 22 kHz, oversample by 3 and call the filter with 1/3 effective cutoff. |
More general notes: The cutoff is modulable, it means to recompute the filter coeffs, potentially at the audio rate.
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I made a multimode-filter wrapper class. It is a very simple API. It's probable that sfizz can use it like it is, however, it will be better if I make also a dedicated stereo wrapper, because then it can optimize filter computations further. It permits modulation of Cutoff and Q. It works like this:
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Implemented most of filters in the sfz-filters-experimental repo above.
From observation, state-variable variants don't have a lot of difference with ordinary biquads. In the repo, you can find also a JACK Qt client if you'd like to test these filters. |
Added the Peaking EQ and shelves. |
Hi @jpcima and thank for all this work. I may not have time until this WE but I will prepare integration then and we can discuss more on a pull request if that's OK with you? |
Let's move this into the release, thanks alot! |
I attach an implementation of filters which matches ARIA near perfectly. (when implemented there)
It uses some very generic resonant filters, it showed to be quite easy to reproduce them.
Current:
sfz-filters
sfzfilters.dsp.gzReference:
https://sfzformat.com/opcodes/fil_type
https://sfzformat.com/opcodes/fil2_type
https://shepazu.github.io/Audio-EQ-Cookbook/audio-eq-cookbook.html
Status:
New ARIA extensions:
Not implemented by ARIA:
Implemented by us, not in specification:
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