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131 lines
3.8 KiB
C++
131 lines
3.8 KiB
C++
/* firmin.c
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This file is part of a program that implements a Software-Defined Radio.
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Copyright (C) 2016 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 "fir.hpp"
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#include "firmin.hpp"
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namespace WDSP {
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/********************************************************************************************************
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* *
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* Time-Domain FIR *
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* *
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********************************************************************************************************/
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void FIRMIN::calc_firmin (FIRMIN *a)
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{
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a->h = FIR::fir_bandpass (a->nc, a->f_low, a->f_high, a->samplerate, a->wintype, 1, a->gain);
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a->rsize = a->nc;
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a->mask = a->rsize - 1;
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a->ring = new float[a->rsize * 2]; // (float *) malloc0 (a->rsize * sizeof (complex));
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a->idx = 0;
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}
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FIRMIN* FIRMIN::create_firmin (int run, int position, int size, float* in, float* out,
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int nc, float f_low, float f_high, int samplerate, int wintype, float gain)
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{
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FIRMIN *a = new FIRMIN;
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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->nc = nc;
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a->f_low = f_low;
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a->f_high = f_high;
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a->samplerate = samplerate;
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a->wintype = wintype;
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a->gain = gain;
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calc_firmin (a);
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return a;
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}
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void FIRMIN::destroy_firmin (FIRMIN *a)
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{
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delete[] (a->ring);
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delete[] (a->h);
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delete (a);
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}
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void FIRMIN::flush_firmin (FIRMIN *a)
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{
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std::fill(a->ring, a->ring + a->rsize * 2, 0);
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a->idx = 0;
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}
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void FIRMIN::xfirmin (FIRMIN *a, int pos)
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{
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if (a->run && a->position == pos)
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{
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int i, j, k;
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for (i = 0; i < a->size; i++)
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{
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a->ring[2 * a->idx + 0] = a->in[2 * i + 0];
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a->ring[2 * a->idx + 1] = a->in[2 * i + 1];
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a->out[2 * i + 0] = 0.0;
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a->out[2 * i + 1] = 0.0;
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k = a->idx;
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for (j = 0; j < a->nc; j++)
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{
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a->out[2 * i + 0] += a->h[2 * j + 0] * a->ring[2 * k + 0] - a->h[2 * j + 1] * a->ring[2 * k + 1];
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a->out[2 * i + 1] += a->h[2 * j + 0] * a->ring[2 * k + 1] + a->h[2 * j + 1] * a->ring[2 * k + 0];
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k = (k + a->mask) & a->mask;
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}
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a->idx = (a->idx + 1) & a->mask;
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}
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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 FIRMIN::setBuffers_firmin (FIRMIN *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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}
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void FIRMIN::setSamplerate_firmin (FIRMIN *a, int rate)
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{
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a->samplerate = (float)rate;
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calc_firmin (a);
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}
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void FIRMIN::setSize_firmin (FIRMIN *a, int size)
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{
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a->size = size;
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}
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void FIRMIN::setFreqs_firmin (FIRMIN *a, float f_low, float 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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calc_firmin (a);
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}
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} // namespace WDSP
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