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#include "config.h"
#include "splitter.h"
#include <cmath>
#include <limits>
#include <algorithm>
#include "math_defs.h"
void BandSplitter::init(float f0norm)
{
float w = f0norm * F_TAU;
float cw = std::cos(w);
if(cw > std::numeric_limits<float>::epsilon())
coeff = (std::sin(w) - 1.0f) / cw;
else
coeff = cw * -0.5f;
lp_z1 = 0.0f;
lp_z2 = 0.0f;
ap_z1 = 0.0f;
}
void BandSplitter::process(float *RESTRICT hpout, float *RESTRICT lpout, const float *input, int count)
{
ASSUME(count > 0);
const float ap_coeff{this->coeff};
const float lp_coeff{this->coeff*0.5f + 0.5f};
float lp_z1{this->lp_z1};
float lp_z2{this->lp_z2};
float ap_z1{this->ap_z1};
auto proc_sample = [ap_coeff,lp_coeff,&lp_z1,&lp_z2,&ap_z1,&lpout](const float in) noexcept -> float
{
/* Low-pass sample processing. */
float d{(in - lp_z1) * lp_coeff};
float lp_y{lp_z1 + d};
lp_z1 = lp_y + d;
d = (lp_y - lp_z2) * lp_coeff;
lp_y = lp_z2 + d;
lp_z2 = lp_y + d;
*(lpout++) = lp_y;
/* All-pass sample processing. */
float ap_y{in*ap_coeff + ap_z1};
ap_z1 = in - ap_y*ap_coeff;
/* High-pass generated from removing low-passed output. */
return ap_y - lp_y;
};
std::transform(input, input+count, hpout, proc_sample);
this->lp_z1 = lp_z1;
this->lp_z2 = lp_z2;
this->ap_z1 = ap_z1;
}
void SplitterAllpass::init(float f0norm)
{
float w = f0norm * F_TAU;
float cw = std::cos(w);
if(cw > std::numeric_limits<float>::epsilon())
coeff = (std::sin(w) - 1.0f) / cw;
else
coeff = cw * -0.5f;
z1 = 0.0f;
}
void SplitterAllpass::process(float *RESTRICT samples, int count)
{
ASSUME(count > 0);
const float coeff{this->coeff};
float z1{this->z1};
auto proc_sample = [coeff,&z1](const float in) noexcept -> float
{
float out{in*coeff + z1};
z1 = in - out*coeff;
return out;
};
std::transform(samples, samples+count, samples, proc_sample);
this->z1 = z1;
}
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