mirror of
https://github.com/f4exb/sdrangel.git
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142 lines
3.9 KiB
C++
142 lines
3.9 KiB
C++
/* iir.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, 2022, 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 "sphp.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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* Complex Single-Pole High-Pass *
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* *
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********************************************************************************************************/
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void SPHP::calc_sphp(SPHP *a)
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{
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double g;
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a->x0 = new double[a->nstages * 2]; // (float*)malloc0(a->nstages * sizeof(complex));
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a->x1 = new double[a->nstages * 2]; // (float*)malloc0(a->nstages * sizeof(complex));
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a->y0 = new double[a->nstages * 2]; // (float*)malloc0(a->nstages * sizeof(complex));
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a->y1 = new double[a->nstages * 2]; // (float*)malloc0(a->nstages * sizeof(complex));
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g = exp(-TWOPI * a->fc / a->rate);
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a->b0 = +0.5 * (1.0 + g);
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a->b1 = -0.5 * (1.0 + g);
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a->a1 = -g;
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}
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SPHP* SPHP::create_sphp(int run, int size, float* in, float* out, double rate, double fc, int nstages)
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{
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SPHP *a = new SPHP;
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a->run = run;
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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 = rate;
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a->fc = fc;
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a->nstages = nstages;
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calc_sphp(a);
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return a;
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}
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void SPHP::decalc_sphp(SPHP *a)
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{
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delete[](a->y1);
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delete[](a->y0);
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delete[](a->x1);
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delete[](a->x0);
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}
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void SPHP::destroy_sphp(SPHP *a)
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{
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decalc_sphp(a);
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delete(a);
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}
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void SPHP::flush_sphp(SPHP *a)
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{
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std::fill(a->x0, a->x0 + a->nstages * 2, 0);
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std::fill(a->x1, a->x0 + a->nstages * 2, 0);
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std::fill(a->y0, a->x0 + a->nstages * 2, 0);
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std::fill(a->y1, a->x0 + a->nstages * 2, 0);
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}
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void SPHP::xsphp(SPHP *a)
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{
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if (a->run)
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{
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int i, j, n;
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for (i = 0; i < a->size; i++)
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{
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for (j = 0; j < 2; j++)
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{
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a->x0[j] = a->in[2 * i + j];
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for (n = 0; n < a->nstages; n++)
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{
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if (n > 0)
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a->x0[2 * n + j] = a->y0[2 * (n - 1) + j];
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a->y0[2 * n + j] = a->b0 * a->x0[2 * n + j]
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+ a->b1 * a->x1[2 * n + j]
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- a->a1 * a->y1[2 * n + j];
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a->y1[2 * n + j] = a->y0[2 * n + j];
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a->x1[2 * n + j] = a->x0[2 * n + j];
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}
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a->out[2 * i + j] = a->y0[2 * (a->nstages - 1) + j];
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}
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}
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}
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else if (a->out != a->in)
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{
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std::copy(a->in, a->in + a->size * 2, a->out);
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}
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}
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void SPHP::setBuffers_sphp(SPHP *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 SPHP::setSamplerate_sphp(SPHP *a, int rate)
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{
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decalc_sphp(a);
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a->rate = rate;
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calc_sphp(a);
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}
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void SPHP::setSize_sphp(SPHP *a, int size)
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{
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a->size = size;
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flush_sphp(a);
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}
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} // namespace WDSP
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