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41 lines
838 B
C++
41 lines
838 B
C++
// Copyright 2020 Mobilinkd LLC.
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#pragma once
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#include "IirFilter.h"
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#include <array>
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#include <algorithm>
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#include <numeric>
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#include <cmath>
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#include <tuple>
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namespace modemm17
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{
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struct CarrierDetect
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{
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using result_t = std::tuple<bool, float>;
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BaseIirFilter<3> filter_;
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float lock_;
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float unlock_;
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bool locked_ = false;
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CarrierDetect(std::array<float, 3> const& b, std::array<float, 3> const& a, float lock_level, float unlock_level)
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: filter_(b, a), lock_(lock_level), unlock_(unlock_level)
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{
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}
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result_t operator()(float value)
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{
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auto filtered = filter_(std::abs(value));
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if (locked_ && (filtered > unlock_)) locked_ = false;
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else if (!locked_ && (filtered < lock_)) locked_ = true;
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return std::make_tuple(locked_, filtered);
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}
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};
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} // modemm17
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