mirror of
https://github.com/f4exb/sdrangel.git
synced 2024-11-10 18:43:28 -05:00
131 lines
3.8 KiB
C++
131 lines
3.8 KiB
C++
/* firmin.c
|
|
|
|
This file is part of a program that implements a Software-Defined Radio.
|
|
|
|
Copyright (C) 2016 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 "comm.hpp"
|
|
#include "fir.hpp"
|
|
#include "firmin.hpp"
|
|
|
|
namespace WDSP {
|
|
|
|
/********************************************************************************************************
|
|
* *
|
|
* Time-Domain FIR *
|
|
* *
|
|
********************************************************************************************************/
|
|
|
|
void FIRMIN::calc_firmin (FIRMIN *a)
|
|
{
|
|
a->h = FIR::fir_bandpass (a->nc, a->f_low, a->f_high, a->samplerate, a->wintype, 1, a->gain);
|
|
a->rsize = a->nc;
|
|
a->mask = a->rsize - 1;
|
|
a->ring = new float[a->rsize * 2]; // (float *) malloc0 (a->rsize * sizeof (complex));
|
|
a->idx = 0;
|
|
}
|
|
|
|
FIRMIN* FIRMIN::create_firmin (int run, int position, int size, float* in, float* out,
|
|
int nc, float f_low, float f_high, int samplerate, int wintype, float gain)
|
|
{
|
|
FIRMIN *a = new FIRMIN;
|
|
a->run = run;
|
|
a->position = position;
|
|
a->size = size;
|
|
a->in = in;
|
|
a->out = out;
|
|
a->nc = nc;
|
|
a->f_low = f_low;
|
|
a->f_high = f_high;
|
|
a->samplerate = samplerate;
|
|
a->wintype = wintype;
|
|
a->gain = gain;
|
|
calc_firmin (a);
|
|
return a;
|
|
}
|
|
|
|
void FIRMIN::destroy_firmin (FIRMIN *a)
|
|
{
|
|
delete[] (a->ring);
|
|
delete[] (a->h);
|
|
delete (a);
|
|
}
|
|
|
|
void FIRMIN::flush_firmin (FIRMIN *a)
|
|
{
|
|
std::fill(a->ring, a->ring + a->rsize * 2, 0);
|
|
a->idx = 0;
|
|
}
|
|
|
|
void FIRMIN::xfirmin (FIRMIN *a, int pos)
|
|
{
|
|
if (a->run && a->position == pos)
|
|
{
|
|
int i, j, k;
|
|
for (i = 0; i < a->size; i++)
|
|
{
|
|
a->ring[2 * a->idx + 0] = a->in[2 * i + 0];
|
|
a->ring[2 * a->idx + 1] = a->in[2 * i + 1];
|
|
a->out[2 * i + 0] = 0.0;
|
|
a->out[2 * i + 1] = 0.0;
|
|
k = a->idx;
|
|
for (j = 0; j < a->nc; j++)
|
|
{
|
|
a->out[2 * i + 0] += a->h[2 * j + 0] * a->ring[2 * k + 0] - a->h[2 * j + 1] * a->ring[2 * k + 1];
|
|
a->out[2 * i + 1] += a->h[2 * j + 0] * a->ring[2 * k + 1] + a->h[2 * j + 1] * a->ring[2 * k + 0];
|
|
k = (k + a->mask) & a->mask;
|
|
}
|
|
a->idx = (a->idx + 1) & a->mask;
|
|
}
|
|
}
|
|
else if (a->in != a->out)
|
|
std::copy( a->in, a->in + a->size * 2, a->out);
|
|
}
|
|
|
|
void FIRMIN::setBuffers_firmin (FIRMIN *a, float* in, float* out)
|
|
{
|
|
a->in = in;
|
|
a->out = out;
|
|
}
|
|
|
|
void FIRMIN::setSamplerate_firmin (FIRMIN *a, int rate)
|
|
{
|
|
a->samplerate = (float)rate;
|
|
calc_firmin (a);
|
|
}
|
|
|
|
void FIRMIN::setSize_firmin (FIRMIN *a, int size)
|
|
{
|
|
a->size = size;
|
|
}
|
|
|
|
void FIRMIN::setFreqs_firmin (FIRMIN *a, float f_low, float f_high)
|
|
{
|
|
a->f_low = f_low;
|
|
a->f_high = f_high;
|
|
calc_firmin (a);
|
|
}
|
|
|
|
} // namespace WDSP
|