kopia lustrzana https://github.com/f4exb/sdrangel
136 wiersze
3.5 KiB
C++
136 wiersze
3.5 KiB
C++
/* shift.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 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 "shift.hpp"
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#include "RXA.hpp"
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namespace WDSP {
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void SHIFT::calc_shift (SHIFT *a)
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{
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a->delta = TWOPI * a->shift / a->rate;
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a->cos_delta = cos (a->delta);
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a->sin_delta = sin (a->delta);
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}
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SHIFT* SHIFT::create_shift (int run, int size, float* in, float* out, int rate, double fshift)
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{
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SHIFT *a = new SHIFT;
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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 = (double) rate;
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a->shift = fshift;
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a->phase = 0.0;
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calc_shift (a);
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return a;
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}
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void SHIFT::destroy_shift (SHIFT *a)
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{
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delete (a);
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}
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void SHIFT::flush_shift (SHIFT *a)
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{
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a->phase = 0.0;
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}
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void SHIFT::xshift (SHIFT *a)
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{
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if (a->run)
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{
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int i;
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double I1, Q1, t1, t2;
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double cos_phase = cos (a->phase);
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double sin_phase = sin (a->phase);
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for (i = 0; i < a->size; i++)
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{
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I1 = a->in[2 * i + 0];
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Q1 = a->in[2 * i + 1];
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a->out[2 * i + 0] = I1 * cos_phase - Q1 * sin_phase;
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a->out[2 * i + 1] = I1 * sin_phase + Q1 * cos_phase;
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t1 = cos_phase;
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t2 = sin_phase;
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cos_phase = t1 * a->cos_delta - t2 * a->sin_delta;
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sin_phase = t1 * a->sin_delta + t2 * a->cos_delta;
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a->phase += a->delta;
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if (a->phase >= TWOPI)
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a->phase -= TWOPI;
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if (a->phase < 0.0 )
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a->phase += TWOPI;
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}
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}
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else if (a->in != a->out)
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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 SHIFT::setBuffers_shift(SHIFT *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 SHIFT::setSamplerate_shift (SHIFT *a, int rate)
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{
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a->rate = rate;
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a->phase = 0.0;
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calc_shift(a);
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}
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void SHIFT::setSize_shift (SHIFT *a, int size)
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{
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a->size = size;
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flush_shift (a);
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}
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/********************************************************************************************************
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* *
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* RXA Properties *
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* *
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********************************************************************************************************/
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void SHIFT::SetShiftRun (RXA& rxa, int run)
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{
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rxa.shift.p->run = run;
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}
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void SHIFT::SetShiftFreq (RXA& rxa, double fshift)
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{
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rxa.shift.p->shift = fshift;
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calc_shift (rxa.shift.p);
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}
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} // namespace WDSP
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