kopia lustrzana https://github.com/vsamy/DiFipp
49 wiersze
1.0 KiB
C++
49 wiersze
1.0 KiB
C++
#pragma once
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#include "GenericFilter.h"
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#include "typedefs.h"
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#include <cmath>
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#include <complex>
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namespace fratio {
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// https://www.dsprelated.com/showarticle/1119.php
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template <typename T>
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class Butterworth : public DigitalFilter<T> {
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public:
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T PI = static_cast<T>(M_PI);
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public:
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enum class Type {
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LowPass,
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HighPass
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};
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// public:
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// static double minimumRequiredFrequency(...);
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public:
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Butterworth(Type type = Type::LowPass);
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Butterworth(size_t order, T fc, T fs, Type type = Type::LowPass);
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void setFilterParameters(size_t order, T fc, T fs);
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private:
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void initialize(size_t order, T fc, T fs);
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void computeDigitalRep();
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void updateCoeffSize();
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std::complex<T> generateAnalogPole(T fpw, size_t k);
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Eigen::VectorX<std::complex<T>> generateAnalogZeros();
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void scaleAmplitude();
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private:
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Type m_type;
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size_t m_order;
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T m_fc;
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T m_fs;
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Eigen::VectorX<std::complex<T>> m_poles;
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};
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} // namespace fratio
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#include "Butterworth.tpp"
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