kopia lustrzana https://github.com/f4exb/sdrangel
142 wiersze
3.9 KiB
C++
142 wiersze
3.9 KiB
C++
/* iir.c
|
|
|
|
This file is part of a program that implements a Software-Defined Radio.
|
|
|
|
Copyright (C) 2014, 2022, 2023 Warren Pratt, NR0V
|
|
Copyright (C) 2024 Edouard Griffiths, F4EXB Adapted to SDRangel
|
|
|
|
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 2
|
|
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 with this program; if not, write to the Free Software
|
|
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
|
|
|
|
The author can be reached by email at
|
|
|
|
warren@wpratt.com
|
|
|
|
*/
|
|
|
|
#include "sphp.hpp"
|
|
#include "RXA.hpp"
|
|
#include "TXA.hpp"
|
|
|
|
namespace WDSP {
|
|
|
|
/********************************************************************************************************
|
|
* *
|
|
* Complex Single-Pole High-Pass *
|
|
* *
|
|
********************************************************************************************************/
|
|
|
|
void SPHP::calc_sphp(SPHP *a)
|
|
{
|
|
double g;
|
|
a->x0 = new double[a->nstages * 2]; // (float*)malloc0(a->nstages * sizeof(complex));
|
|
a->x1 = new double[a->nstages * 2]; // (float*)malloc0(a->nstages * sizeof(complex));
|
|
a->y0 = new double[a->nstages * 2]; // (float*)malloc0(a->nstages * sizeof(complex));
|
|
a->y1 = new double[a->nstages * 2]; // (float*)malloc0(a->nstages * sizeof(complex));
|
|
g = exp(-TWOPI * a->fc / a->rate);
|
|
a->b0 = +0.5 * (1.0 + g);
|
|
a->b1 = -0.5 * (1.0 + g);
|
|
a->a1 = -g;
|
|
}
|
|
|
|
SPHP* SPHP::create_sphp(int run, int size, float* in, float* out, double rate, double fc, int nstages)
|
|
{
|
|
SPHP *a = new SPHP;
|
|
a->run = run;
|
|
a->size = size;
|
|
a->in = in;
|
|
a->out = out;
|
|
a->rate = rate;
|
|
a->fc = fc;
|
|
a->nstages = nstages;
|
|
calc_sphp(a);
|
|
return a;
|
|
}
|
|
|
|
void SPHP::decalc_sphp(SPHP *a)
|
|
{
|
|
delete[](a->y1);
|
|
delete[](a->y0);
|
|
delete[](a->x1);
|
|
delete[](a->x0);
|
|
}
|
|
|
|
void SPHP::destroy_sphp(SPHP *a)
|
|
{
|
|
decalc_sphp(a);
|
|
delete(a);
|
|
}
|
|
|
|
void SPHP::flush_sphp(SPHP *a)
|
|
{
|
|
std::fill(a->x0, a->x0 + a->nstages * 2, 0);
|
|
std::fill(a->x1, a->x0 + a->nstages * 2, 0);
|
|
std::fill(a->y0, a->x0 + a->nstages * 2, 0);
|
|
std::fill(a->y1, a->x0 + a->nstages * 2, 0);
|
|
}
|
|
|
|
void SPHP::xsphp(SPHP *a)
|
|
{
|
|
if (a->run)
|
|
{
|
|
int i, j, n;
|
|
for (i = 0; i < a->size; i++)
|
|
{
|
|
for (j = 0; j < 2; j++)
|
|
{
|
|
a->x0[j] = a->in[2 * i + j];
|
|
|
|
for (n = 0; n < a->nstages; n++)
|
|
{
|
|
if (n > 0)
|
|
a->x0[2 * n + j] = a->y0[2 * (n - 1) + j];
|
|
|
|
a->y0[2 * n + j] = a->b0 * a->x0[2 * n + j]
|
|
+ a->b1 * a->x1[2 * n + j]
|
|
- a->a1 * a->y1[2 * n + j];
|
|
a->y1[2 * n + j] = a->y0[2 * n + j];
|
|
a->x1[2 * n + j] = a->x0[2 * n + j];
|
|
}
|
|
|
|
a->out[2 * i + j] = a->y0[2 * (a->nstages - 1) + j];
|
|
}
|
|
}
|
|
}
|
|
else if (a->out != a->in)
|
|
{
|
|
std::copy(a->in, a->in + a->size * 2, a->out);
|
|
}
|
|
}
|
|
|
|
void SPHP::setBuffers_sphp(SPHP *a, float* in, float* out)
|
|
{
|
|
a->in = in;
|
|
a->out = out;
|
|
}
|
|
|
|
void SPHP::setSamplerate_sphp(SPHP *a, int rate)
|
|
{
|
|
decalc_sphp(a);
|
|
a->rate = rate;
|
|
calc_sphp(a);
|
|
}
|
|
|
|
void SPHP::setSize_sphp(SPHP *a, int size)
|
|
{
|
|
a->size = size;
|
|
flush_sphp(a);
|
|
}
|
|
|
|
} // namespace WDSP
|