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Add the equalizer band filter

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This commit is contained in:
Jean Pierre Cimalando 2020-02-05 10:31:58 +01:00
parent bc72240bed
commit a7e6ae14ce
1 changed files with 9 additions and 1 deletions
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10
src/sfizz/dsp/filters/sfz_filters.dsp
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@ -11,7 +11,7 @@ sk = library("sallenkey_modulable.dsp");
// Generators
// the SFZ *noise generator
sfzNoise = no.noise : *(gate) : *(0.25);
sfzNoise = no.noise : *(0.25);
//==============================================================================
// Filters
@ -90,6 +90,12 @@ sfzHsh = fm.rbjHighShelfSmooth(smoothCoefs,cutoff,pkShGain,Q);
// the SFZ peaking EQ filter
sfzPeq = fm.rbjPeakingEqSmooth(smoothCoefs,cutoff,pkShGain,Q);
// the SFZ equalizer band
sfzEq = fm.rbjPeakingEqSmooth(smoothCoefs,cutoff,pkShGain,Q) with {
Q = 1./(2.*ma.sinh(0.5*log(2)*bandwidth*w0/sin(w0)));
w0 = 2*ma.PI*max(0,cutoff)/ma.SR;
};
//==============================================================================
// Filters (stereo)
@ -116,6 +122,7 @@ sfz2chBrf2pSv = par(i,2,sfzBrf2pSv);
sfz2chLsh = par(i,2,sfzLsh);
sfz2chHsh = par(i,2,sfzHsh);
sfz2chPeq = par(i,2,sfzPeq);
sfz2chEq = par(i,2,sfzEq);
//==============================================================================
// Filter parameters
@ -123,6 +130,7 @@ sfz2chPeq = par(i,2,sfzPeq);
cutoff = hslider("[01] Cutoff [unit:Hz] [scale:log]", 440.0, 50.0, 10000.0, 1.0);
Q = vslider("[02] Resonance [unit:dB]", 0.0, 0.0, 40.0, 0.1) : ba.db2linear;
pkShGain = vslider("[03] Peak/shelf gain [unit:dB]", 0.0, 0.0, 40.0, 0.1);
bandwidth = vslider("[04] Bandwidth [unit:octave]", 1.0, 0.1, 10.0, 0.01);
// smoothing function to prevent fast changes of filter coefficients
smoothCoefs = si.smoo; // TODO check if this is appropriate otherwise replace