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sdrangel/sdrgui/gui/fmpreemphasisdialog.cpp
2020-09-24 08:36:13 +02:00

101 lines
3.3 KiB
C++

///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2020 Jon Beniston, M7RCE //
// //
// This program is free software; you can redistribute it and/or modify //
// it under the terms of the GNU General Public License as published by //
// the Free Software Foundation as version 3 of the License, or //
// (at your option) any later version. //
// //
// This program is distributed in the hope that it will be useful, //
// but WITHOUT ANY WARRANTY; without even the implied warranty of //
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
// GNU General Public License V3 for more details. //
// //
// You should have received a copy of the GNU General Public License //
// along with this program. If not, see <http://www.gnu.org/licenses/>. //
///////////////////////////////////////////////////////////////////////////////////
#define _USE_MATH_DEFINES
#include <cmath>
#include "fmpreemphasisdialog.h"
#include "ui_fmpreemphasisdialog.h"
// Convert from s to us
#define TAU_SCALE 1000000.0
FMPreemphasisDialog::FMPreemphasisDialog(float tau, float highFreq, QWidget* parent) :
QDialog(parent),
ui(new Ui::FMPreemphasisDialog)
{
ui->setupUi(this);
ui->tau->setValue(tau*TAU_SCALE);
ui->lowFreq->setValue(1.0/(2.0*M_PI*tau));
ui->highFreq->setValue(highFreq);
}
FMPreemphasisDialog::~FMPreemphasisDialog()
{
delete ui;
}
void FMPreemphasisDialog::accept()
{
m_tau = ui->tau->value()/TAU_SCALE;
m_highFreq = ui->highFreq->value();
QDialog::accept();
}
void FMPreemphasisDialog::on_tau_valueChanged(double value)
{
// Set corresponding low frequency
ui->lowFreq->blockSignals(true);
ui->lowFreq->setValue(1.0/(2.0*M_PI*(value/TAU_SCALE)));
updateCombo();
ui->lowFreq->blockSignals(false);
}
void FMPreemphasisDialog::on_lowFreq_valueChanged(double value)
{
// Set corresponding tau
ui->tau->blockSignals(true);
ui->tau->setValue(TAU_SCALE*1.0/(2.0*M_PI*value));
updateCombo();
ui->tau->blockSignals(false);
}
void FMPreemphasisDialog::updateCombo()
{
double value = ui->tau->value();
if (value == 531.0)
ui->preset->setCurrentIndex(0);
else if (value == 75.0)
ui->preset->setCurrentIndex(1);
else if (value == 50.0)
ui->preset->setCurrentIndex(2);
else
ui->preset->setCurrentIndex(3);
}
void FMPreemphasisDialog::on_preset_currentIndexChanged(int value)
{
if (value == 0)
{
// Narrowband FM
ui->lowFreq->setValue(300.0);
ui->highFreq->setValue(3000.0);
}
else if (value == 1)
{
// Broadcast FM (US)
ui->tau->setValue(75.0);
ui->highFreq->setValue(12000.0);
}
else if (value == 2)
{
// Broadcast FM (EU)
ui->tau->setValue(50.0);
ui->highFreq->setValue(12000.0);
}
}