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sdrangel/wdsp/emph.cpp

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8.8 KiB
C++
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/* emph.c
This file is part of a program that implements a Software-Defined Radio.
Copyright (C) 2014, 2016, 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 "comm.hpp"
#include "emph.hpp"
#include "fcurve.hpp"
#include "fircore.hpp"
#include "TXA.hpp"
namespace WDSP {
/********************************************************************************************************
* *
* Partitioned Overlap-Save FM Pre-Emphasis *
* *
********************************************************************************************************/
EMPHP* EMPHP::create_emphp (int run, int position, int size, int nc, int mp, float* in, float* out, int rate, int ctype, float f_low, float f_high)
{
EMPHP *a = new EMPHP;
float* impulse;
a->run = run;
a->position = position;
a->size = size;
a->nc = nc;
a->mp = mp;
a->in = in;
a->out = out;
a->rate = rate;
a->ctype = ctype;
a->f_low = f_low;
a->f_high = f_high;
impulse = FCurve::fc_impulse (a->nc, a->f_low, a->f_high, -20.0 * log10(a->f_high / a->f_low), 0.0, a->ctype, a->rate, 1.0 / (2.0 * a->size), 0, 0);
a->p = FIRCORE::create_fircore (a->size, a->in, a->out, a->nc, a->mp, impulse);
delete[] (impulse);
return a;
}
void EMPHP::destroy_emphp (EMPHP *a)
{
FIRCORE::destroy_fircore (a->p);
delete (a);
}
void EMPHP::flush_emphp (EMPHP *a)
{
FIRCORE::flush_fircore (a->p);
}
void EMPHP::xemphp (EMPHP *a, int position)
{
if (a->run && a->position == position)
FIRCORE::xfircore (a->p);
else if (a->in != a->out)
std::copy( a->in, a->in + a->size * 2, a->out);
}
void EMPHP::setBuffers_emphp (EMPHP *a, float* in, float* out)
{
a->in = in;
a->out = out;
FIRCORE::setBuffers_fircore (a->p, a->in, a->out);
}
void EMPHP::setSamplerate_emphp (EMPHP *a, int rate)
{
float* impulse;
a->rate = rate;
impulse = FCurve::fc_impulse (a->nc, a->f_low, a->f_high, -20.0 * log10(a->f_high / a->f_low), 0.0, a->ctype, a->rate, 1.0 / (2.0 * a->size), 0, 0);
FIRCORE::setImpulse_fircore (a->p, impulse, 1);
delete[] (impulse);
}
void EMPHP::setSize_emphp (EMPHP *a, int size)
{
float* impulse;
a->size = size;
FIRCORE::setSize_fircore (a->p, a->size);
impulse = FCurve::fc_impulse (a->nc, a->f_low, a->f_high, -20.0 * log10(a->f_high / a->f_low), 0.0, a->ctype, a->rate, 1.0 / (2.0 * a->size), 0, 0);
FIRCORE::setImpulse_fircore (a->p, impulse, 1);
delete[] (impulse);
}
/********************************************************************************************************
* *
* Partitioned Overlap-Save FM Pre-Emphasis: TXA Properties *
* *
********************************************************************************************************/
void EMPHP::SetFMEmphPosition (TXA& txa, int position)
{
txa.preemph->position = position;
}
void EMPHP::SetFMEmphMP (TXA& txa, int mp)
{
EMPHP *a;
a = txa.preemph;
if (a->mp != mp)
{
a->mp = mp;
FIRCORE::setMp_fircore (a->p, a->mp);
}
}
void EMPHP::SetFMEmphNC (TXA& txa, int nc)
{
EMPHP *a;
float* impulse;
a = txa.preemph;
if (a->nc != nc)
{
a->nc = nc;
impulse = FCurve::fc_impulse (a->nc, a->f_low, a->f_high, -20.0 * log10(a->f_high / a->f_low), 0.0, a->ctype, a->rate, 1.0 / (2.0 * a->size), 0, 0);
FIRCORE::setNc_fircore (a->p, a->nc, impulse);
delete[] (impulse);
}
}
void EMPHP::SetFMPreEmphFreqs (TXA& txa, float low, float high)
{
EMPHP *a;
float* impulse;
a = txa.preemph;
if (a->f_low != low || a->f_high != high)
{
a->f_low = low;
a->f_high = high;
impulse = FCurve::fc_impulse (a->nc, a->f_low, a->f_high, -20.0 * log10(a->f_high / a->f_low), 0.0, a->ctype, a->rate, 1.0 / (2.0 * a->size), 0, 0);
FIRCORE::setImpulse_fircore (a->p, impulse, 1);
delete[] (impulse);
}
}
/********************************************************************************************************
* *
* Overlap-Save FM Pre-Emphasis *
* *
********************************************************************************************************/
void EMPH::calc_emph (EMPH *a)
{
a->infilt = new float[2 * a->size * 2]; // (float *)malloc0(2 * a->size * sizeof(complex));
a->product = new float[2 * a->size * 2]; // (float *)malloc0(2 * a->size * sizeof(complex));
a->mults = FCurve::fc_mults(a->size, a->f_low, a->f_high, -20.0 * log10(a->f_high / a->f_low), 0.0, a->ctype, a->rate, 1.0 / (2.0 * a->size), 0, 0);
a->CFor = fftwf_plan_dft_1d(2 * a->size, (fftwf_complex *)a->infilt, (fftwf_complex *)a->product, FFTW_FORWARD, FFTW_PATIENT);
a->CRev = fftwf_plan_dft_1d(2 * a->size, (fftwf_complex *)a->product, (fftwf_complex *)a->out, FFTW_BACKWARD, FFTW_PATIENT);
}
void EMPH::decalc_emph (EMPH *a)
{
fftwf_destroy_plan(a->CRev);
fftwf_destroy_plan(a->CFor);
delete[] (a->mults);
delete[] (a->product);
delete[] (a->infilt);
}
EMPH* EMPH::create_emph (int run, int position, int size, float* in, float* out, int rate, int ctype, float f_low, float f_high)
{
EMPH *a = new EMPH;
a->run = run;
a->position = position;
a->size = size;
a->in = in;
a->out = out;
a->rate = (float)rate;
a->ctype = ctype;
a->f_low = f_low;
a->f_high = f_high;
calc_emph (a);
return a;
}
void EMPH::destroy_emph (EMPH *a)
{
decalc_emph (a);
delete (a);
}
void EMPH::flush_emph (EMPH *a)
{
std::fill(a->infilt, a->infilt + 2 * a->size * 2, 0);
}
void EMPH::xemph (EMPH *a, int position)
{
int i;
float I, Q;
if (a->run && a->position == position)
{
std::copy(a->in, a->in + a->size * 2, &(a->infilt[2 * a->size]));
fftwf_execute (a->CFor);
for (i = 0; i < 2 * a->size; i++)
{
I = a->product[2 * i + 0];
Q = a->product[2 * i + 1];
a->product[2 * i + 0] = I * a->mults[2 * i + 0] - Q * a->mults[2 * i + 1];
a->product[2 * i + 1] = I * a->mults[2 * i + 1] + Q * a->mults[2 * i + 0];
}
fftwf_execute (a->CRev);
std::copy(&(a->infilt[2 * a->size]), &(a->infilt[2 * a->size]) + a->size * 2, a->infilt);
}
else if (a->in != a->out)
std::copy( a->in, a->in + a->size * 2, a->out);
}
void EMPH::setBuffers_emph (EMPH *a, float* in, float* out)
{
decalc_emph (a);
a->in = in;
a->out = out;
calc_emph (a);
}
void EMPH::setSamplerate_emph (EMPH *a, int rate)
{
decalc_emph (a);
a->rate = rate;
calc_emph (a);
}
void EMPH::setSize_emph (EMPH *a, int size)
{
decalc_emph(a);
a->size = size;
calc_emph(a);
}
/********************************************************************************************************
* *
* Overlap-Save FM Pre-Emphasis: TXA Properties *
* *
********************************************************************************************************/
/* // Uncomment when needed
PORT
void SetTXAFMEmphPosition (int channel, int position)
{
ch.csDSP.lock();
txa.preemph->position = position;
ch.csDSP.unlock();
}
*/
} // namespace WDSP
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