kopia lustrzana https://github.com/f4exb/sdrangel
280 wiersze
8.6 KiB
C++
280 wiersze
8.6 KiB
C++
/* bandpass.c
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This file is part of a program that implements a Software-Defined Radio.
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Copyright (C) 2013, 2016, 2017 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 "bps.hpp"
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#include "fir.hpp"
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#include "bandpass.hpp"
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#include "RXA.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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* Overlap-Save Bandpass *
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* *
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********************************************************************************************************/
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void BPS::calc_bps (BPS *a)
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{
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float* impulse;
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a->infilt = new float[2 * a->size * 2];
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a->product = new float[2 * a->size * 2];
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impulse = FIR::fir_bandpass(a->size + 1, a->f_low, a->f_high, a->samplerate, a->wintype, 1, 1.0 / (float)(2 * a->size));
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a->mults = FIR::fftcv_mults(2 * a->size, impulse);
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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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delete[](impulse);
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}
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void BPS::decalc_bps (BPS *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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BPS* BPS::create_bps (int run, int position, int size, float* in, float* out,
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float f_low, float f_high, int samplerate, int wintype, float gain)
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{
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BPS *a = new BPS;
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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->samplerate = (float)samplerate;
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a->wintype = wintype;
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a->gain = gain;
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a->in = in;
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a->out = out;
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a->f_low = f_low;
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a->f_high = f_high;
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calc_bps (a);
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return a;
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}
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void BPS::destroy_bps (BPS *a)
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{
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decalc_bps (a);
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delete a;
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}
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void BPS::flush_bps (BPS *a)
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{
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std::fill(a->infilt, a->infilt + 2 * a->size * 2, 0);
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}
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void BPS::xbps (BPS *a, int pos)
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{
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int i;
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float I, Q;
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if (a->run && pos == a->position)
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{
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std::copy(a->in, a->in + a->size * 2, &(a->infilt[2 * a->size]));
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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->gain * a->product[2 * i + 0];
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Q = a->gain * 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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std::copy(&(a->infilt[2 * a->size]), &(a->infilt[2 * a->size]) + a->size * 2, a->infilt);
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}
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else if (a->in != a->out)
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std::copy( a->in, a->in + a->size * 2, a->out);
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}
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void BPS::setBuffers_bps (BPS *a, float* in, float* out)
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{
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decalc_bps (a);
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a->in = in;
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a->out = out;
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calc_bps (a);
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}
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void BPS::setSamplerate_bps (BPS *a, int rate)
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{
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decalc_bps (a);
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a->samplerate = rate;
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calc_bps (a);
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}
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void BPS::setSize_bps (BPS *a, int size)
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{
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decalc_bps (a);
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a->size = size;
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calc_bps (a);
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}
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void BPS::setFreqs_bps (BPS *a, float f_low, float f_high)
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{
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decalc_bps (a);
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a->f_low = f_low;
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a->f_high = f_high;
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calc_bps (a);
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}
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/********************************************************************************************************
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* *
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* Overlap-Save Bandpass: RXA Properties *
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* *
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********************************************************************************************************/
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void BPS::SetBPSRun (RXA& rxa, int run)
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{
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rxa.bp1.p->run = run;
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}
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void BPS::SetBPSFreqs (RXA& rxa, float f_low, float f_high)
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{
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float* impulse;
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BPS *a1;
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a1 = rxa.bps1.p;
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if ((f_low != a1->f_low) || (f_high != a1->f_high))
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{
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a1->f_low = f_low;
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a1->f_high = f_high;
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delete[] (a1->mults);
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impulse = FIR::fir_bandpass(a1->size + 1, f_low, f_high, a1->samplerate, a1->wintype, 1, 1.0 / (float)(2 * a1->size));
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a1->mults = FIR::fftcv_mults (2 * a1->size, impulse);
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delete[] (impulse);
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}
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}
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void BPS::SetBPSWindow (RXA& rxa, int wintype)
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{
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float* impulse;
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BPS *a1;
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a1 = rxa.bps1.p;
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if ((a1->wintype != wintype))
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{
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a1->wintype = wintype;
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delete[] (a1->mults);
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impulse = FIR::fir_bandpass(a1->size + 1, a1->f_low, a1->f_high, a1->samplerate, a1->wintype, 1, 1.0 / (float)(2 * a1->size));
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a1->mults = FIR::fftcv_mults (2 * a1->size, impulse);
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delete[] (impulse);
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}
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}
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/********************************************************************************************************
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* *
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* TXA Properties *
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* *
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********************************************************************************************************/
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// UNCOMMENT properties when pointers in place in txa
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void BPS::SetBPSRun (TXA& txa, int run)
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{
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txa.bp1.p->run = run;
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}
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void BPS::SetBPSFreqs (TXA& txa, float f_low, float f_high)
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{
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float* impulse;
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BPS *a;
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a = txa.bps0.p;
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if ((f_low != a->f_low) || (f_high != a->f_high))
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{
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a->f_low = f_low;
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a->f_high = f_high;
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delete[] (a->mults);
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impulse = FIR::fir_bandpass(a->size + 1, f_low, f_high, a->samplerate, a->wintype, 1, 1.0 / (float)(2 * a->size));
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a->mults = FIR::fftcv_mults (2 * a->size, impulse);
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delete[] (impulse);
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}
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a = txa.bps1.p;
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if ((f_low != a->f_low) || (f_high != a->f_high))
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{
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a->f_low = f_low;
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a->f_high = f_high;
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delete[] (a->mults);
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impulse = FIR::fir_bandpass(a->size + 1, f_low, f_high, a->samplerate, a->wintype, 1, 1.0 / (float)(2 * a->size));
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a->mults = FIR::fftcv_mults (2 * a->size, impulse);
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delete[] (impulse);
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}
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a = txa.bps2.p;
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if ((f_low != a->f_low) || (f_high != a->f_high))
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{
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a->f_low = f_low;
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a->f_high = f_high;
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delete[] (a->mults);
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impulse = FIR::fir_bandpass(a->size + 1, f_low, f_high, a->samplerate, a->wintype, 1, 1.0 / (float)(2 * a->size));
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a->mults = FIR::fftcv_mults (2 * a->size, impulse);
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delete[] (impulse);
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}
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}
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void BPS::SetBPSWindow (TXA& txa, int wintype)
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{
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float* impulse;
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BPS *a;
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a = txa.bps0.p;
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if (a->wintype != wintype)
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{
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a->wintype = wintype;
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delete[] (a->mults);
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impulse = FIR::fir_bandpass(a->size + 1, a->f_low, a->f_high, a->samplerate, a->wintype, 1, 1.0 / (float)(2 * a->size));
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a->mults = FIR::fftcv_mults (2 * a->size, impulse);
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delete[] (impulse);
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}
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a = txa.bps1.p;
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if (a->wintype != wintype)
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{
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a->wintype = wintype;
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delete[] (a->mults);
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impulse = FIR::fir_bandpass(a->size + 1, a->f_low, a->f_high, a->samplerate, a->wintype, 1, 1.0 / (float)(2 * a->size));
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a->mults = FIR::fftcv_mults (2 * a->size, impulse);
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delete[] (impulse);
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}
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a = txa.bps2.p;
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if (a->wintype != wintype)
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{
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a->wintype = wintype;
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delete[] (a->mults);
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impulse = FIR::fir_bandpass (a->size + 1, a->f_low, a->f_high, a->samplerate, a->wintype, 1, 1.0 / (float)(2 * a->size));
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a->mults = FIR::fftcv_mults (2 * a->size, impulse);
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delete[] (impulse);
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}
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}
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} // namespace WDSP
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