mirror of
https://github.com/f4exb/sdrangel.git
synced 2024-11-21 15:51:47 -05:00
133 lines
3.3 KiB
C++
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
|