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sdrangel/modemm17/DeviationError.h

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// Copyright 2020 Mobilinkd LLC.
#pragma once
#include <array>
#include <algorithm>
#include <numeric>
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namespace modemm17
{
template <size_t N = 10>
struct DeviationError
{
DeviationError()
{
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minima_.fill(0.0f);
maxima_.fill(0.0f);
}
float operator()(float sample)
{
if (sample > ZERO)
{
if (sample > max_estimate_ * 0.67 or max_count_ == 5)
{
max_count_ = 0;
maxima_[max_index_++] = sample;
if (max_index_ == N)
{
max_rolled_ = true;
max_index_ = 0;
}
if (max_rolled_)
{
max_estimate_ = std::accumulate(std::begin(maxima_), std::end(maxima_), ZERO) / N;
}
else
{
max_estimate_ = std::accumulate(std::begin(maxima_), std::begin(maxima_) + max_index_, ZERO) / max_index_;
}
}
else
{
++max_count_;
}
}
else if (sample < 0)
{
if (sample < min_estimate_ * 0.67 or min_count_ == 5)
{
min_count_ = 0;
minima_[min_index_++] = sample;
if (min_index_ == N)
{
min_rolled_ = true;
min_index_ = 0;
}
if (min_rolled_)
{
min_estimate_ = std::accumulate(std::begin(minima_), std::end(minima_), ZERO) / N;
}
else
{
min_estimate_ = std::accumulate(std::begin(minima_), std::begin(minima_) + min_index_, ZERO) / min_index_;
}
}
else
{
++min_count_;
}
}
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float deviation = max_estimate_ - min_estimate_;
float deviation_error = std::min(6.0f / deviation, 100.0f);
return deviation_error;
}
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private:
std::array<float, N> minima_;
std::array<float, N> maxima_;
size_t min_index_ = 0;
size_t max_index_ = 0;
bool min_rolled_ = false;
bool max_rolled_ = false;
size_t min_count_ = 0;
size_t max_count_ = 0;
float min_estimate_ = 0.0f;
float max_estimate_ = 0.0f;
const float ZERO = 0.0f;
};
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} // modemm17