conversions.hpp

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// toolboxes/signal/include/nk/signal/filter_implementation/conversions.hpp
//
// Convert between filter representations: zp2sos / tf2sos. The cascade
// applicator sosfilt lives in digital_filtering/sosfilt.hpp.
 
#pragma once
 
#include <memory_resource>
#include <nk/value/value.hpp>
 
#include <tuple>
 
namespace nk::signal {

 

Value zp2sos(const Value &                zeros,
             const Value &                poles,
             double                       gain,
             std::pmr::memory_resource *  mr = nullptr);

std::tuple<Value, double>
zp2sosWithGain(const Value &                zeros,
               const Value &                poles,
               double                       gain,
               std::pmr::memory_resource *  mr = nullptr,
               bool                         surplusAtOrigin = true);

Value tf2sos(const Value &                b,
             const Value &                a,
             std::pmr::memory_resource *  mr = nullptr);

std::tuple<Value, double>
tf2sosWithGain(const Value &b, const Value &a,
               std::pmr::memory_resource *mr = nullptr);
 

} // namespace nk::signal