bark2hertz.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: bark2herz.hpp
* Author: Mohammed Boujemaoui
* Date: 12/10/18
*/

#ifndef EDSP_BARK2HERZ_HPP
#define EDSP_BARK2HERZ_HPP

namespace edsp { inline namespace converter {

    template <typename T>
    constexpr T bark2hertz(T z) noexcept {
        if (z < 2) {
            z = (z - 0.3) / 0.85;
        }

        if (z > 20.1) {
            z = (z - 4.422) / 1.22;
        }
        return 1960.0 * (z + 0.53) / (26.28 - z);
    }

}} // namespace edsp::converter

#endif //EDSP_BARK2HERZ_HPP