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Transposed-form 2 biquads

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This commit is contained in:
Jean Pierre Cimalando 2020-04-21 19:49:29 +02:00
parent 3b9d4d3e63
commit ffcdca81f6
1 changed files with 10 additions and 8 deletions
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18
src/sfizz/dsp/filters/filters_modulable.dsp
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@ -11,6 +11,7 @@ rbj = library("rbj_filters.dsp");
// b0,b1,b2,a1,a2 : normalized coefficients
//-------------------------------------------------------------------------
biquad(b0,b1,b2,a1,a2) = fi.iir((b0,b1,b2),(a1,a2));
biquadTf2(b0,b1,b2,a1,a2) = fi.tf22t(b0,b1,b2,a1,a2);
//-------------------------------------------------------------------------
// Biquad filter using smoothed coefficients
@ -18,6 +19,7 @@ biquad(b0,b1,b2,a1,a2) = fi.iir((b0,b1,b2),(a1,a2));
// b0,b1,b2,a1,a2 : normalized coefficients
//-------------------------------------------------------------------------
smoothBiquad(s,b0,b1,b2,a1,a2) = biquad(b0:s,b1:s,b2:s,a1:s,a2:s);
smoothBiquadTf2(s,b0,b1,b2,a1,a2) = biquadTf2(b0:s,b1:s,b2:s,a1:s,a2:s);
//-------------------------------------------------------------------------
// RBJ filter of a specific type using smoothed coefficients
@ -27,14 +29,14 @@ smoothBiquad(s,b0,b1,b2,a1,a2) = biquad(b0:s,b1:s,b2:s,a1:s,a2:s);
// q : height of the resonant peak in linear units
//-------------------------------------------------------------------------
rbjLpfSmooth(s,f,g,q,x) = (rbj.filtercoeff(f,g,q).LPF,x) : smoothBiquad(s);
rbjHpfSmooth(s,f,g,q,x) = (rbj.filtercoeff(f,g,q).HPF,x) : smoothBiquad(s);
rbjBpfSmooth(s,f,g,q,x) = (rbj.filtercoeff(f,g,q).BPF,x) : smoothBiquad(s);
rbjNotchSmooth(s,f,g,q,x) = (rbj.filtercoeff(f,g,q).notch,x) : smoothBiquad(s);
rbjApfSmooth(s,f,g,q,x) = (rbj.filtercoeff(f,g,q).APF,x) : smoothBiquad(s);
rbjPeakingEqSmooth(s,f,g,q,x) = (rbj.filtercoeff(f,g,q).peakingEQ,x) : smoothBiquad(s);
rbjPeakingNotchSmooth(s,f,g,q,x) = (rbj.filtercoeff(f,g,q).peakNotch,x) : smoothBiquad(s);
rbjLowShelfSmooth(s,f,g,q,x) = (rbj.filtercoeff(f,g,q).lowShelf,x) : smoothBiquad(s);
rbjHighShelfSmooth(s,f,g,q,x) = (rbj.filtercoeff(f,g,q).highShelf,x) : smoothBiquad(s);
rbjHpfSmooth(s,f,g,q,x) = (rbj.filtercoeff(f,g,q).HPF,x) : smoothBiquadTf2(s);
rbjBpfSmooth(s,f,g,q,x) = (rbj.filtercoeff(f,g,q).BPF,x) : smoothBiquadTf2(s);
rbjNotchSmooth(s,f,g,q,x) = (rbj.filtercoeff(f,g,q).notch,x) : smoothBiquadTf2(s);
rbjApfSmooth(s,f,g,q,x) = (rbj.filtercoeff(f,g,q).APF,x) : smoothBiquadTf2(s);
rbjPeakingEqSmooth(s,f,g,q,x) = (rbj.filtercoeff(f,g,q).peakingEQ,x) : smoothBiquadTf2(s);
rbjPeakingNotchSmooth(s,f,g,q,x) = (rbj.filtercoeff(f,g,q).peakNotch,x) : smoothBiquadTf2(s);
rbjLowShelfSmooth(s,f,g,q,x) = (rbj.filtercoeff(f,g,q).lowShelf,x) : smoothBiquadTf2(s);
rbjHighShelfSmooth(s,f,g,q,x) = (rbj.filtercoeff(f,g,q).highShelf,x) : smoothBiquadTf2(s);
//-------------------------------------------------------------------------
// 1-pole low-pass filter