Me and a coworker are currently in the process of making an audio dsp library. We are wondering what some good FIR and IIR filters to use were. I know ALOT of them but what do you guys think in best/necessary for audio? Also if you have any other ideas not related to FIR and IIR filters please give your input.

  • $\begingroup$ do you mean code for different FIR and IIR structures? or do you mean specific FIR and IIR filters, complete with defined coefficients? $\endgroup$ – robert bristow-johnson Jul 16 '15 at 3:57
  • $\begingroup$ Just to make the structures. I have a general filter function already. $\endgroup$ – Caleb Merchant Jul 21 '15 at 1:54
  • $\begingroup$ probably for simple real-time filter effects, you want to cascade 2nd-order sections. if the filters get modulated a lot, you probably want each 2nd-order section to be a lattice or normalized ladder, but direct-form biquads might work fine. $\endgroup$ – robert bristow-johnson Jul 21 '15 at 6:44

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