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35 lines
1.3 KiB
C++
35 lines
1.3 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2016 Bolero MURAKAMI
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https://github.com/bolero-MURAKAMI/Sprout
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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=============================================================================*/
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#ifndef SPROUT_COMPOST_UTILITY_ROSENBERG_HPP
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#define SPROUT_COMPOST_UTILITY_ROSENBERG_HPP
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#include <sprout/config.hpp>
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#include <sprout/detail/pow.hpp>
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#include <sprout/type_traits/float_promote.hpp>
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namespace sprout {
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namespace compost {
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//
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// rosenberg_value
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// Rosenberg 波は，声門開大期と閉小期が周期の40%，16%となる非対称形の波形であり，τ1 が開大期，τ2が閉小期を示す．
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//
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template<typename T>
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inline SPROUT_CONSTEXPR typename sprout::float_promote<T>::type
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rosenberg_value(T x, T tau1, T tau2) {
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typedef typename sprout::float_promote<T>::type type;
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return x >= 0 && x <= tau1
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? 3 * sprout::detail::pow2<type>(x / tau1) - 2 * sprout::detail::pow3<type>(x / tau1)
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: x > tau1 && x <= tau1 + tau2
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? 1 - sprout::detail::pow2<type>((x - tau1) / tau2)
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: 0
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;
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}
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} // namespace compost
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} // namespace sprout
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#endif // #ifndef SPROUT_COMPOST_UTILITY_ROSENBERG_HPP
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