ame_RcLowPass.hpp

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#pragma once
 
#include "ame_Math.hpp"
 
#include <cassert>
#include <concepts>
#include <type_traits>
 
namespace ame::dsp
{
template <std::floating_point FloatType>
class RcLowPass
{
    static_assert (! std::is_const<FloatType>::value, "FloatType is must NOT be const.");
 
public:
    explicit RcLowPass (FloatType sampleRate)
        : samplePeriod (FloatType (1.0) / sampleRate)
    {
    }
    ~RcLowPass() = default;
 
    void setSampleRate (FloatType newSampleRate) noexcept
    {
        samplePeriod = FloatType (1.0) / newSampleRate;
    }
 
    void setCutOffFrequency (FloatType cutOffFrequency) noexcept
    {
        coef = (ame::twoPi<FloatType> * cutOffFrequency * samplePeriod) / (ame::twoPi<FloatType> * cutOffFrequency * samplePeriod + 1);
    }
 
    void setRawCoefficient (FloatType newRawCoefficient)
    {
        assert (0.0f < newRawCoefficient && newRawCoefficient <= 1.0f);
        coef = newRawCoefficient;
    }
 
    FloatType getRawCoefficient() const noexcept
    {
        return coef;
    }
 
    FloatType process (FloatType input) noexcept
    {
        lastOutput = coef * input + (FloatType (1.0) - coef) * lastOutput;
        return lastOutput;
    }
 
private:
    FloatType coef { 1.0 };
    FloatType lastOutput {};
    FloatType samplePeriod { 1.0f / 48000.0f };
};
} // namespace ame::dsp