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Transposed biquad filters #198

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jpcima opened this issue Apr 21, 2020 · 0 comments

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jpcima commented Apr 21, 2020

We can reexpress the biquad filters in alternate form. (transposed)

Supposedly, this form has better stability.
https://ccrma.stanford.edu/~jos/fp/Numerical_Robustness_TDF_II.html

Currently we have worse stability that ARIA on a few models.
For instance, the BRF ones are not very stable at all under modulation.

See also

https://en.wikipedia.org/wiki/Digital_biquad_filter#Transposed_Direct_form_2

jpcima mentioned this issue

Filter updates #199

Merged

jpcima closed this as completed

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