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sdrangel/wdsp/firmin.cpp
2024-08-10 06:40:35 +02:00

133 lines
3.3 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()
{
FIR::fir_bandpass (h, nc, f_low, f_high, samplerate, wintype, 1, gain);
rsize = nc;
mask = rsize - 1;
ring.resize(rsize * 2);
idx = 0;
}
FIRMIN::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
)
{
run = _run;
position = _position;
size = _size;
in = _in;
out = _out;
nc = _nc;
f_low = _f_low;
f_high = _f_high;
samplerate = (float) _samplerate;
wintype = _wintype;
gain = _gain;
calc();
}
void FIRMIN::flush()
{
std::fill(ring.begin(), ring.end(), 0);
idx = 0;
}
void FIRMIN::execute(int _pos)
{
if (run && position == _pos)
{
int k;
for (int i = 0; i < size; i++)
{
ring[2 * idx + 0] = in[2 * i + 0];
ring[2 * idx + 1] = in[2 * i + 1];
out[2 * i + 0] = 0.0;
out[2 * i + 1] = 0.0;
k = idx;
for (int j = 0; j < nc; j++)
{
out[2 * i + 0] += h[2 * j + 0] * ring[2 * k + 0] - h[2 * j + 1] * ring[2 * k + 1];
out[2 * i + 1] += h[2 * j + 0] * ring[2 * k + 1] + h[2 * j + 1] * ring[2 * k + 0];
k = (k + mask) & mask;
}
idx = (idx + 1) & mask;
}
}
else if (in != out)
std::copy( in, in + size * 2, out);
}
void FIRMIN::setBuffers(float* _in, float* _out)
{
in = _in;
out = _out;
}
void FIRMIN::setSamplerate(int _rate)
{
samplerate = (float) _rate;
calc();
}
void FIRMIN::setSize(int _size)
{
size = _size;
}
void FIRMIN::setFreqs(float _f_low, float _f_high)
{
f_low = _f_low;
f_high = _f_high;
calc();
}
} // namespace WDSP