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sdrangel/wdsp/eq.cpp
2024-08-09 06:33:00 +02:00

166 lines
4.2 KiB
C++

/* eq.c
This file is part of a program that implements a Software-Defined Radio.
Copyright (C) 2013, 2016, 2017 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 "eq.hpp"
#include "eqp.hpp"
#include "fircore.hpp"
#include "fir.hpp"
#include "RXA.hpp"
#include "TXA.hpp"
namespace WDSP {
/********************************************************************************************************
* *
* Overlap-Save Equalizer *
* *
********************************************************************************************************/
void EQ::eq_mults (std::vector<float>& mults, int size, int nfreqs, float* F, float* G, float samplerate, float scale, int ctfmode, int wintype)
{
std::vector<float> impulse;
EQP::eq_impulse (impulse, size + 1, nfreqs, F, G, samplerate, scale, ctfmode, wintype);
std::vector<float> _mults;
FIR::fftcv_mults(_mults, 2 * size, impulse.data());
mults.resize(2 * size * 2);
std::copy(_mults.begin(), _mults.end(), mults.begin());
}
void EQ::calc()
{
scale = (float) (1.0 / (float)(2 * size));
infilt.resize(2 * size * 2);
product.resize(2 * size * 2);
CFor = fftwf_plan_dft_1d(
2 * size,
(fftwf_complex *) infilt.data(),
(fftwf_complex *) product.data(),
FFTW_FORWARD,
FFTW_PATIENT
);
CRev = fftwf_plan_dft_1d(
2 * size,
(fftwf_complex *) product.data(),
(fftwf_complex *) out,
FFTW_BACKWARD,
FFTW_PATIENT
);
EQ::eq_mults(mults, size, nfreqs, F.data(), G.data(), samplerate, scale, ctfmode, wintype);
}
void EQ::decalc()
{
fftwf_destroy_plan(CRev);
fftwf_destroy_plan(CFor);
}
EQ::EQ(
int _run,
int _size,
float *_in,
float *_out,
int _nfreqs,
const float* _F,
const float* _G,
int _ctfmode,
int _wintype,
int _samplerate
) :
run(_run),
size(_size),
in(_in),
out(_out),
nfreqs(_nfreqs),
ctfmode(_ctfmode),
wintype(_wintype),
samplerate((float) _samplerate)
{
F.resize(nfreqs + 1);
G.resize(nfreqs + 1);
std::copy(_F, _F + nfreqs + 1, F.begin());
std::copy(_G, _G + nfreqs + 1, G.begin());
calc();
}
EQ::~EQ()
{
decalc();
}
void EQ::flush()
{
std::fill(infilt.begin(), infilt.end(), 0);
}
void EQ::execute()
{
float I;
float Q;
if (run)
{
std::copy(in, in + size * 2, &(infilt[2 * size]));
fftwf_execute (CFor);
for (int i = 0; i < 2 * size; i++)
{
I = product[2 * i + 0];
Q = product[2 * i + 1];
product[2 * i + 0] = I * mults[2 * i + 0] - Q * mults[2 * i + 1];
product[2 * i + 1] = I * mults[2 * i + 1] + Q * mults[2 * i + 0];
}
fftwf_execute (CRev);
std::copy(&(infilt[2 * size]), &(infilt[2 * size]) + size * 2, infilt);
}
else if (in != out)
std::copy( in, in + size * 2, out);
}
void EQ::setBuffers(float* _in, float* _out)
{
decalc();
in = _in;
out = _out;
calc();
}
void EQ::setSamplerate(int _rate)
{
decalc();
samplerate = (float) _rate;
calc();
}
void EQ::setSize(int _size)
{
decalc();
size = _size;
calc();
}
} // namespace WDSP