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DSP: Solved an issue with FilterDesign::designFIRLowpassHalfBandEquirippleMethod for low amplitudedB and normalisationTransitionWidth close to 0.5

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Ivan Cohen 2020-12-07 17:01:38 +01:00 • committed by reuk
parent b0c8917430
commit b2e49bc7e8
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1 changed files with 7 additions and 2 deletions
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9
modules/juce_dsp/filter_design/juce_FilterDesign.cpp
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@ -279,9 +279,14 @@ typename FIR::Coefficients<FloatType>::Ptr
else
{
auto w01 = std::sqrt (kp * kp + (1 - kp * kp) * std::pow (std::cos (MathConstants<double>::pi / (2.0 * n + 1.0)), 2.0));
auto om01 = std::acos (-w01);
NN = -2.0 * result->getMagnitudeForFrequency (om01 / MathConstants<double>::twoPi, 1.0);
if (std::abs (w01) <= 1.0)
{
auto om01 = std::acos (-w01);
NN = -2.0 * result->getMagnitudeForFrequency (om01 / MathConstants<double>::twoPi, 1.0);
}
else
NN = 2.0 * result->getMagnitudeForFrequency (0.5, 1.0);
}
for (int i = 0; i < hh.size(); ++i)