IIR Filters – peaking & formant
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I've recently needed to use resonant bandpass filters in an oF app, but it seems that the
bandpassfilter doesn't quite work (at least it didn't in my instance). Here are two IIR filters I've implemented subsequently based on this cookbook by Robert Bristow-Johnson.peaking– emphasizes a certain frequency bandformant– basically a resonant bandpass, differs from the former in that it suppresses all other frequenciesBoth take cutoff frequency, Q and gain as arguments: Q and gain both range from 0.0-1.0, both are
doubles.I'm planning to implement a formant filterbank class not unlike the
fffb~object in Max/MSP as well – hopefully very soon.jakub
Note: sorry about the million identical substitutions in the diff, git is being crazy and I have no idea why. The only real changes are in the
maxiFiltersections.