2024-06-16 09:31:13 +00:00
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/* amsq.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 "amsq.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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void AMSQ::compute_slews(AMSQ *a)
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{
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int i;
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2024-07-06 01:25:41 +00:00
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double delta, theta;
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delta = PI / (double)a->ntup;
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2024-06-16 09:31:13 +00:00
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theta = 0.0;
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for (i = 0; i <= a->ntup; i++)
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{
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a->cup[i] = a->muted_gain + (1.0 - a->muted_gain) * 0.5 * (1.0 - cos (theta));
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theta += delta;
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}
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2024-07-06 01:25:41 +00:00
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delta = PI / (double)a->ntdown;
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2024-06-16 09:31:13 +00:00
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theta = 0.0;
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for (i = 0; i <= a->ntdown; i++)
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{
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a->cdown[i] = a->muted_gain + (1.0 - a->muted_gain) * 0.5 * (1.0 + cos (theta));
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theta += delta;
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}
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}
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void AMSQ::calc_amsq(AMSQ *a)
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{
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// signal averaging
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2024-07-16 21:15:13 +00:00
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a->trigsig = new float[a->size * 2];
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2024-06-16 09:31:13 +00:00
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a->avm = exp(-1.0 / (a->rate * a->avtau));
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a->onem_avm = 1.0 - a->avm;
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a->avsig = 0.0;
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// level change
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a->ntup = (int)(a->tup * a->rate);
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a->ntdown = (int)(a->tdown * a->rate);
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2024-06-25 01:50:48 +00:00
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a->cup = new float[(a->ntup + 1) * 2]; // (float *)malloc0((a->ntup + 1) * sizeof(float));
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a->cdown = new float[(a->ntdown + 1) * 2]; // (float *)malloc0((a->ntdown + 1) * sizeof(float));
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compute_slews(a);
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// control
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a->state = 0;
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}
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void AMSQ::decalc_amsq (AMSQ *a)
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{
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delete[] a->cdown;
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delete[] a->cup;
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delete[] a->trigsig;
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}
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2024-07-06 01:25:41 +00:00
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AMSQ* AMSQ::create_amsq (
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int run,
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int size,
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float* in,
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float* out,
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float* trigger,
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int rate,
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double avtau,
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double tup,
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double tdown,
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double tail_thresh,
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double unmute_thresh,
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double min_tail,
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double max_tail,
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double muted_gain
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)
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{
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AMSQ *a = new AMSQ;
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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 = (float)rate;
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a->muted_gain = muted_gain;
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a->trigger = trigger;
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a->avtau = avtau;
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a->tup = tup;
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a->tdown = tdown;
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a->tail_thresh = tail_thresh;
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a->unmute_thresh = unmute_thresh;
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a->min_tail = min_tail;
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a->max_tail = max_tail;
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calc_amsq (a);
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return a;
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}
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void AMSQ::destroy_amsq (AMSQ *a)
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{
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decalc_amsq (a);
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delete a;
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}
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void AMSQ::flush_amsq (AMSQ*a)
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{
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std::fill(a->trigsig, a->trigsig + a->size * 2, 0);
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a->avsig = 0.0;
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a->state = 0;
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}
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enum _amsqstate
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{
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MUTED,
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INCREASE,
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UNMUTED,
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TAIL,
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DECREASE
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};
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void AMSQ::xamsq (AMSQ *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 sig, siglimit;
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for (i = 0; i < a->size; i++)
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{
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sig = sqrt (a->trigsig[2 * i + 0] * a->trigsig[2 * i + 0] + a->trigsig[2 * i + 1] * a->trigsig[2 * i + 1]);
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a->avsig = a->avm * a->avsig + a->onem_avm * sig;
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switch (a->state)
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{
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case MUTED:
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if (a->avsig > a->unmute_thresh)
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{
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a->state = INCREASE;
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a->count = a->ntup;
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}
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a->out[2 * i + 0] = a->muted_gain * a->in[2 * i + 0];
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a->out[2 * i + 1] = a->muted_gain * a->in[2 * i + 1];
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break;
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case INCREASE:
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a->out[2 * i + 0] = a->in[2 * i + 0] * a->cup[a->ntup - a->count];
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a->out[2 * i + 1] = a->in[2 * i + 1] * a->cup[a->ntup - a->count];
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if (a->count-- == 0)
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a->state = UNMUTED;
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break;
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case UNMUTED:
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if (a->avsig < a->tail_thresh)
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{
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a->state = TAIL;
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if ((siglimit = a->avsig) > 1.0) siglimit = 1.0;
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a->count = (int)((a->min_tail + (a->max_tail - a->min_tail) * (1.0 - siglimit)) * a->rate);
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}
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a->out[2 * i + 0] = a->in[2 * i + 0];
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a->out[2 * i + 1] = a->in[2 * i + 1];
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break;
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case TAIL:
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a->out[2 * i + 0] = a->in[2 * i + 0];
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a->out[2 * i + 1] = a->in[2 * i + 1];
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if (a->avsig > a->unmute_thresh)
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a->state = UNMUTED;
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else if (a->count-- == 0)
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{
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a->state = DECREASE;
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a->count = a->ntdown;
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}
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break;
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case DECREASE:
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a->out[2 * i + 0] = a->in[2 * i + 0] * a->cdown[a->ntdown - a->count];
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a->out[2 * i + 1] = a->in[2 * i + 1] * a->cdown[a->ntdown - a->count];
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if (a->count-- == 0)
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a->state = MUTED;
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break;
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}
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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 AMSQ::xamsqcap (AMSQ *a)
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{
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std::copy(a->trigger, a->trigger + a->size * 2, a->trigsig);
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}
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2024-06-25 01:50:48 +00:00
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void AMSQ::setBuffers_amsq (AMSQ *a, float* in, float* out, float* trigger)
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{
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a->in = in;
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a->out = out;
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a->trigger = trigger;
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}
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void AMSQ::setSamplerate_amsq (AMSQ *a, int rate)
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{
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decalc_amsq (a);
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a->rate = rate;
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calc_amsq (a);
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}
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void AMSQ::setSize_amsq (AMSQ *a, int size)
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{
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decalc_amsq (a);
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a->size = size;
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calc_amsq (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 AMSQ::SetAMSQRun (RXA& rxa, int run)
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{
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rxa.amsq.p->run = run;
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}
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2024-07-06 01:25:41 +00:00
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void AMSQ::SetAMSQThreshold (RXA& rxa, double threshold)
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{
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double thresh = pow (10.0, threshold / 20.0);
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rxa.amsq.p->tail_thresh = 0.9 * thresh;
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rxa.amsq.p->unmute_thresh = thresh;
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}
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2024-07-06 01:25:41 +00:00
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void AMSQ::SetAMSQMaxTail (RXA& rxa, double tail)
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{
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AMSQ *a;
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a = rxa.amsq.p;
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if (tail < a->min_tail) tail = a->min_tail;
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a->max_tail = tail;
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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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void AMSQ::SetAMSQRun (TXA& txa, int run)
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{
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txa.amsq.p->run = run;
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}
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2024-07-06 01:25:41 +00:00
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void AMSQ::SetAMSQMutedGain (TXA& txa, double dBlevel)
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{ // dBlevel is negative
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AMSQ *a;
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a = txa.amsq.p;
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a->muted_gain = pow (10.0, dBlevel / 20.0);
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compute_slews(a);
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}
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2024-07-06 01:25:41 +00:00
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void AMSQ::SetAMSQThreshold (TXA& txa, double threshold)
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{
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double thresh = pow (10.0, threshold / 20.0);
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txa.amsq.p->tail_thresh = 0.9 * thresh;
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txa.amsq.p->unmute_thresh = thresh;
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}
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} // namespace WDSP
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