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Label filter computations correctly

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Gordon JC Pearce 2024-07-28 22:00:07 +01:00
parent 19647d387d
commit 54a007977c
1 changed files with 2 additions and 2 deletions
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4
plugin/barrverb.cpp
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@ -52,7 +52,7 @@ BarrVerb::BarrVerb() : Plugin(kParameterCount, 1, 0) { // two parameters, one p
float fc = 10000; float fc = 10000;
float F = fc / 48000; // assume 48kHz float F = fc / 48000; // assume 48kHz
float w = 2 * tan(3.14159 * F); float w = 2 * tan(3.14159 * F);
float a = w / 0.5412; // 1dB Chebyshev, 2-pole float a = w / 0.5412; // Butterworth 4-pole first stage
float b = w * w; float b = w * w;
// "corrected" SVF params, per Fons Adriaensen // "corrected" SVF params, per Fons Adriaensen
@ -63,7 +63,7 @@ BarrVerb::BarrVerb() : Plugin(kParameterCount, 1, 0) { // two parameters, one p
fc = 10000; fc = 10000;
F = fc / 48000; // assume 48kHz F = fc / 48000; // assume 48kHz
w = 2 * tan(3.14159 * F); w = 2 * tan(3.14159 * F);
a = w / 1.3065; // 1dB Chebyshev, 2-pole a = w / 1.3065; // Butterworth 4-pole second stage
b = w * w; b = w * w;
c1_2 = (a + b) / (1 + a / 2 + b / 4); c1_2 = (a + b) / (1 + a / 2 + b / 4);