hertz2bark.hpp

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/*
* eDSP, A cross-platform Digital Signal Processing library written in modern C++.
* Copyright (C) 2018 Mohammed Boujemaoui Boulaghmoudi, All rights reserved.
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation, either version 3 of the License, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of  MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along width
* this program.  If not, see <http://www.gnu.org/licenses/>
*
* Filename: hz2bark.hpp
* Author: Mohammed Boujemaoui
* Date: 12/10/18
*/

#ifndef EDSP_HZ2BARK_HPP
#define EDSP_HZ2BARK_HPP

#include <cmath>

namespace edsp { inline namespace converter {

    template <typename T>
    constexpr T hertz2bark(T f) noexcept {
        const auto b = (26.81 * f) / (1960 + f) - 0.53;
        if (b < 2) {
            b += 0.15 * (2 - b);
        }
        if (b > 20.1) {
            b += 0.22 * (b - 20.1);
        }
        return b;
    }

    template <typename T>
    constexpr T bark2band(T z) noexcept {
        return 52548.0 / (z * z - 52.56 * z + 690.39);
    }

}} // namespace edsp::converter

#endif //EDSP_HZ2BARK_HPP