I want to design a Filter with a variable Cutoff Frequency and Resonance. However in the source I'm using there is a Bi-Quad Filter with two IIR and two FIR Filters designed like this :
Furthermore I found that I can compute the coefficients for the different Filter types as stated in this table :
Is there a way to alter those coefficients that i can compute the samples with a variant FIlter Resonance?
EDIT Since I'm designing this filter for a software synthesiser, with resonance I mean the typical boost or reduction of the cutoff-frequency in a variable manner.