mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
synced 2024-11-27 00:53:44 +00:00
35 lines
1.3 KiB
C++
35 lines
1.3 KiB
C++
/*=============================================================================
|
||
Copyright (c) 2011-2013 Bolero MURAKAMI
|
||
https://github.com/bolero-MURAKAMI/Sprout
|
||
|
||
Distributed under the Boost Software License, Version 1.0. (See accompanying
|
||
file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
|
||
=============================================================================*/
|
||
#ifndef SPROUT_COMPOST_UTILITY_ROSENBERG_HPP
|
||
#define SPROUT_COMPOST_UTILITY_ROSENBERG_HPP
|
||
|
||
#include <sprout/config.hpp>
|
||
#include <sprout/detail/pow.hpp>
|
||
#include <sprout/type_traits/float_promote.hpp>
|
||
|
||
namespace sprout {
|
||
namespace compost {
|
||
//
|
||
// rosenberg_value
|
||
// 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．
|
||
//
|
||
template<typename T>
|
||
inline SPROUT_CONSTEXPR typename sprout::float_promote<T>::type
|
||
rosenberg_value(T x, T tau1, T tau2) {
|
||
typedef typename sprout::float_promote<T>::type type;
|
||
return x >= 0 && x <= tau1
|
||
? 3 * sprout::detail::pow2<type>(x / tau1) - 2 * sprout::detail::pow3<type>(x / tau1)
|
||
: x > tau1 && x <= tau1 + tau2
|
||
? 1 - sprout::detail::pow2<type>((x - tau1) / tau2)
|
||
: 0
|
||
;
|
||
}
|
||
} // namespace compost
|
||
} // namespace sprout
|
||
|
||
#endif // #ifndef SPROUT_COMPOST_UTILITY_ROSENBERG_HPP
|