kopia lustrzana https://github.com/ogre/habdec
54 wiersze
1.3 KiB
C++
54 wiersze
1.3 KiB
C++
/*
|
|
|
|
Copyright 2018 Michal Fratczak
|
|
|
|
This file is part of habdec.
|
|
|
|
habdec 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.
|
|
|
|
habdec 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 with habdec. If not, see <https://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <cmath>
|
|
#include <cstring>
|
|
|
|
|
|
template<typename T_flt_>
|
|
inline T_flt_ sinc(T_flt_ x)
|
|
{
|
|
if(x)
|
|
return sin(x)/x;
|
|
else
|
|
return 1;
|
|
}
|
|
|
|
|
|
template<typename T_flt_> // float like types...
|
|
inline T_flt_ BlackmanHarris(const size_t x, const size_t N)
|
|
{
|
|
static const T_flt_ a0 = 0.35874;
|
|
static const T_flt_ a1 = 0.48829;
|
|
static const T_flt_ a2 = 0.14128;
|
|
static const T_flt_ a3 = 0.01168;
|
|
static const T_flt_ PI2 = 2.0*M_PI;
|
|
static const T_flt_ PI4 = 4.0*M_PI;
|
|
static const T_flt_ PI6 = 6.0*M_PI;
|
|
|
|
const T_flt_ N_1 = N-1;
|
|
|
|
T_flt_ w = a0 - a1*cos(PI2*x / N_1) + a2*cos(PI4*x / N_1) - a3*cos(PI6*x / N_1);
|
|
|
|
return w;
|
|
}
|