kopia lustrzana https://github.com/f4exb/sdrangel
276 wiersze
8.9 KiB
C++
276 wiersze
8.9 KiB
C++
/* emph.c
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This file is part of a program that implements a Software-Defined Radio.
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Copyright (C) 2014, 2016, 2023 Warren Pratt, NR0V
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Copyright (C) 2024 Edouard Griffiths, F4EXB Adapted to SDRangel
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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The author can be reached by email at
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warren@wpratt.com
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*/
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#include "comm.hpp"
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#include "emph.hpp"
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#include "fcurve.hpp"
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#include "firmin.hpp"
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#include "TXA.hpp"
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namespace WDSP {
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/********************************************************************************************************
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* *
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* Partitioned Overlap-Save FM Pre-Emphasis *
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* *
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********************************************************************************************************/
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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)
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{
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EMPHP *a = new EMPHP;
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float* impulse;
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a->run = run;
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a->position = position;
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a->size = size;
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a->nc = nc;
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a->mp = mp;
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a->in = in;
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a->out = out;
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a->rate = rate;
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a->ctype = ctype;
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a->f_low = f_low;
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a->f_high = f_high;
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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);
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a->p = FIRCORE::create_fircore (a->size, a->in, a->out, a->nc, a->mp, impulse);
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delete[] (impulse);
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return a;
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}
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void EMPHP::destroy_emphp (EMPHP *a)
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{
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FIRCORE::destroy_fircore (a->p);
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delete (a);
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}
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void EMPHP::flush_emphp (EMPHP *a)
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{
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FIRCORE::flush_fircore (a->p);
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}
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void EMPHP::xemphp (EMPHP *a, int position)
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{
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if (a->run && a->position == position)
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FIRCORE::xfircore (a->p);
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else if (a->in != a->out)
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memcpy (a->out, a->in, a->size * sizeof (wcomplex));
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}
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void EMPHP::setBuffers_emphp (EMPHP *a, float* in, float* out)
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{
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a->in = in;
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a->out = out;
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FIRCORE::setBuffers_fircore (a->p, a->in, a->out);
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}
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void EMPHP::setSamplerate_emphp (EMPHP *a, int rate)
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{
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float* impulse;
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a->rate = rate;
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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);
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FIRCORE::setImpulse_fircore (a->p, impulse, 1);
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delete[] (impulse);
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}
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void EMPHP::setSize_emphp (EMPHP *a, int size)
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{
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float* impulse;
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a->size = size;
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FIRCORE::setSize_fircore (a->p, a->size);
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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);
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FIRCORE::setImpulse_fircore (a->p, impulse, 1);
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delete[] (impulse);
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}
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/********************************************************************************************************
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* *
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* Partitioned Overlap-Save FM Pre-Emphasis: TXA Properties *
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* *
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********************************************************************************************************/
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void EMPHP::SetFMEmphPosition (TXA& txa, int position)
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{
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txa.csDSP.lock();
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txa.preemph.p->position = position;
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txa.csDSP.unlock();
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}
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void EMPHP::SetFMEmphMP (TXA& txa, int mp)
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{
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EMPHP *a;
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a = txa.preemph.p;
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if (a->mp != mp)
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{
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a->mp = mp;
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FIRCORE::setMp_fircore (a->p, a->mp);
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}
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}
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void EMPHP::SetFMEmphNC (TXA& txa, int nc)
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{
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EMPHP *a;
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float* impulse;
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txa.csDSP.lock();
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a = txa.preemph.p;
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if (a->nc != nc)
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{
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a->nc = nc;
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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);
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FIRCORE::setNc_fircore (a->p, a->nc, impulse);
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delete[] (impulse);
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}
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txa.csDSP.unlock();
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}
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void EMPHP::SetFMPreEmphFreqs (TXA& txa, float low, float high)
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{
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EMPHP *a;
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float* impulse;
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txa.csDSP.lock();
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a = txa.preemph.p;
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if (a->f_low != low || a->f_high != high)
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{
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a->f_low = low;
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a->f_high = high;
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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);
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FIRCORE::setImpulse_fircore (a->p, impulse, 1);
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delete[] (impulse);
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}
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txa.csDSP.unlock();
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}
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/********************************************************************************************************
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* *
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* Overlap-Save FM Pre-Emphasis *
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* *
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********************************************************************************************************/
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void EMPH::calc_emph (EMPH *a)
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{
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a->infilt = new float[2 * a->size * 2]; // (float *)malloc0(2 * a->size * sizeof(complex));
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a->product = new float[2 * a->size * 2]; // (float *)malloc0(2 * a->size * sizeof(complex));
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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);
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a->CFor = fftwf_plan_dft_1d(2 * a->size, (fftwf_complex *)a->infilt, (fftwf_complex *)a->product, FFTW_FORWARD, FFTW_PATIENT);
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a->CRev = fftwf_plan_dft_1d(2 * a->size, (fftwf_complex *)a->product, (fftwf_complex *)a->out, FFTW_BACKWARD, FFTW_PATIENT);
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}
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void EMPH::decalc_emph (EMPH *a)
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{
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fftwf_destroy_plan(a->CRev);
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fftwf_destroy_plan(a->CFor);
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delete[] (a->mults);
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delete[] (a->product);
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delete[] (a->infilt);
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}
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EMPH* EMPH::create_emph (int run, int position, int size, float* in, float* out, int rate, int ctype, float f_low, float f_high)
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{
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EMPH *a = new EMPH;
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a->run = run;
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a->position = position;
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a->size = size;
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a->in = in;
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a->out = out;
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a->rate = (float)rate;
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a->ctype = ctype;
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a->f_low = f_low;
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a->f_high = f_high;
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calc_emph (a);
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return a;
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}
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void EMPH::destroy_emph (EMPH *a)
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{
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decalc_emph (a);
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delete (a);
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}
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void EMPH::flush_emph (EMPH *a)
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{
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memset (a->infilt, 0, 2 * a->size * sizeof (wcomplex));
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}
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void EMPH::xemph (EMPH *a, int position)
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{
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int i;
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float I, Q;
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if (a->run && a->position == position)
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{
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memcpy (&(a->infilt[2 * a->size]), a->in, a->size * sizeof (wcomplex));
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fftwf_execute (a->CFor);
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for (i = 0; i < 2 * a->size; i++)
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{
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I = a->product[2 * i + 0];
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Q = a->product[2 * i + 1];
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a->product[2 * i + 0] = I * a->mults[2 * i + 0] - Q * a->mults[2 * i + 1];
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a->product[2 * i + 1] = I * a->mults[2 * i + 1] + Q * a->mults[2 * i + 0];
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}
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fftwf_execute (a->CRev);
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memcpy (a->infilt, &(a->infilt[2 * a->size]), a->size * sizeof(wcomplex));
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}
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else if (a->in != a->out)
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memcpy (a->out, a->in, a->size * sizeof (wcomplex));
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}
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void EMPH::setBuffers_emph (EMPH *a, float* in, float* out)
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{
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decalc_emph (a);
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a->in = in;
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a->out = out;
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calc_emph (a);
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}
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void EMPH::setSamplerate_emph (EMPH *a, int rate)
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{
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decalc_emph (a);
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a->rate = rate;
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calc_emph (a);
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}
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void EMPH::setSize_emph (EMPH *a, int size)
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{
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decalc_emph(a);
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a->size = size;
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calc_emph(a);
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}
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/********************************************************************************************************
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* *
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* Overlap-Save FM Pre-Emphasis: TXA Properties *
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* *
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********************************************************************************************************/
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/* // Uncomment when needed
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PORT
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void SetTXAFMEmphPosition (int channel, int position)
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{
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ch.csDSP.lock();
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txa.preemph.p->position = position;
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ch.csDSP.unlock();
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}
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*/
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} // namespace WDSP
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