kopia lustrzana https://github.com/vsamy/DiFipp
49 wiersze
1.8 KiB
C++
49 wiersze
1.8 KiB
C++
#pragma once
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#include "type_checks.h"
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#include "typedefs.h"
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namespace fratio {
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template <typename T>
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struct BilinearTransform {
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using SubType = internal::complex_sub_type_t<T>;
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static_assert(std::is_floating_point<SubType>::value, "This struct can only accept floating point types (real and complex).");
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static void SToZ(SubType fs, const T& sPlanePole, T& zPlanePole);
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static void SToZ(SubType fs, const Eigen::VectorX<T>& sPlanePoles, Eigen::Ref<Eigen::VectorX<T>>& zPlanePoles); // Can be optimized
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static void ZToS(SubType fs, const T& zPlanePole, T& sPlanePole);
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static void ZToS(SubType fs, const Eigen::VectorX<T>& zPlanePoles, Eigen::Ref<Eigen::VectorX<T>>& sPlanePoles); // Can be optimized
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};
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template <typename T>
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void BilinearTransform<T>::SToZ(SubType fs, const T& sPlanePole, T& zPlanePole)
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{
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T scalePole = sPlanePole / (2 * fs);
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zPlanePole = (T(1) + scalePole) / (T(1) - scalePole);
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}
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template <typename T>
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void BilinearTransform<T>::SToZ(SubType fs, const Eigen::VectorX<T>& sPlanePoles, Eigen::Ref<Eigen::VectorX<T>>& zPlanePoles)
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{
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assert(sPlanePoles.size() == zPlanePoles.size());
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for (Eigen::Index k = 0; k < sPlanePoles.size(); ++k)
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SToZ(fs, sPlanePoles(k), zPlanePoles(k));
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}
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template <typename T>
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void BilinearTransform<T>::ZToS(SubType fs, const T& zPlanePole, T& sPlanePole)
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{
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T invPole = T(1) / zPlanePole;
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sPlanePole = 2 * fs * (T(1) - invPole) / (T(1) + invPole);
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}
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template <typename T>
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void BilinearTransform<T>::ZToS(SubType fs, const Eigen::VectorX<T>& zPlanePoles, Eigen::Ref<Eigen::VectorX<T>>& sPlanePoles)
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{
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assert(zPlanePoles.size() == sPlanePoles.size());
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for (Eigen::Index k = 0; k < sPlanePoles.size(); ++k)
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ZToS(fs, zPlanePoles(k), sPlanePoles(k));
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}
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} // namespace fratio
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