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NFM mod: implemented Digital Code Squelch (DCS)

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This commit is contained in:
f4exb 2021-04-12 12:03:33 +02:00
parent 50940351b7
commit d0c50549af
14 changed files with 284 additions and 1 deletions
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2
plugins/channeltx/modnfm/CMakeLists.txt
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@ -3,6 +3,7 @@ project(modnfm)
set(modnfm_SOURCES
nfmmod.cpp
nfmmodbaseband.cpp
nfmmoddcs.cpp
nfmmodsource.cpp
nfmmodplugin.cpp
nfmmodsettings.cpp
@ -12,6 +13,7 @@ set(modnfm_SOURCES
set(modnfm_HEADERS
nfmmod.h
nfmmodbaseband.h
nfmmoddcs.h
nfmmodsource.h
nfmmodplugin.h
nfmmodsettings.h

3
plugins/channeltx/modnfm/nfmmod.cpp
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@ -260,6 +260,9 @@ void NFMMod::applySettings(const NFMModSettings& settings, bool force)
<< " m_toneFrequency: " << settings.m_toneFrequency
<< " m_ctcssIndex: " << settings.m_ctcssIndex
<< " m_ctcssOn: " << settings.m_ctcssOn
<< " m_dcsOn: " << settings.m_dcsOn
<< " m_dcsCode: " << settings.m_dcsCode
<< " m_dcsPositive: " << settings.m_dcsPositive
<< " m_channelMute: " << settings.m_channelMute
<< " m_playLoop: " << settings.m_playLoop
<< " m_modAFInput " << settings.m_modAFInput

97
plugins/channeltx/modnfm/nfmmoddcs.cpp Normal file
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@ -0,0 +1,97 @@
///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2021 Edouard Griffiths, F4EXB //
// //
// 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/>. //
// //
// Source: https://mmi-comm.tripod.com/dcs.html //
///////////////////////////////////////////////////////////////////////////////////
#include <bitset>
#include "nfmmoddcs.h"
const float NFMModDCS::m_codeRate = 134.3; //!< bits per second
NFMModDCS::NFMModDCS()
{
reset();
}
NFMModDCS::~NFMModDCS()
{
}
void NFMModDCS::reset()
{
m_step = 0;
}
void NFMModDCS::setDCS(int code)
{
unsigned int dcsCode = code < 0 ? 0 : code > 511 ? 511 : code; // trim invalid values
// Parity bits calculation:
unsigned int p[11];
p[0] = std::bitset<32>(dcsCode & 0b10011111).count() % 2; // P0 = C0 + C1 + C2 + C3 + C4 + C7 (modulo two addition)
p[1] = (std::bitset<32>(dcsCode & 0b100111110).count()+1) % 2; // P1 = NOT ( C1 + C2 + C3 + C4 + C5 + C8 )
p[2] = std::bitset<32>(dcsCode & 0b11100011).count() % 2; // P2 = C0 + C1 + C5 + C6 + C7
p[3] = (std::bitset<32>(dcsCode & 0b111000110).count()+1) % 2; // P3 = NOT ( C1 + C2 + C6 + C7 + C8 )
p[4] = (std::bitset<32>(dcsCode & 0b100010011).count()+1) % 2; // P4 = NOT ( C0 + C1 + C4 + C8 )
p[5] = (std::bitset<32>(dcsCode & 0b10111001).count()+1) % 2; // P5 = NOT ( C0 + C3 + C4 + C5 + C7 )
p[6] = std::bitset<32>(dcsCode & 0b111101101).count() % 2; // P6 = C0 + C2 + C3 + C5 + C6 + C7 + C8
p[7] = std::bitset<32>(dcsCode & 0b111011010).count() % 2; // P7 = C1 + C3 + C4 + C6 + C7 + C8
p[8] = std::bitset<32>(dcsCode & 0b110110100).count() % 2; // P8 = C2 + C4 + C5 + C7 + C8
p[9] = (std::bitset<32>(dcsCode & 0b101101000).count()+1) % 2; // P9 = NOT ( C3 + C5 + C6 + C8 )
p[10] = (std::bitset<32>(dcsCode & 0b1001111).count()+1) % 2; // P10 = NOT ( C0 + C1 + C2 + C3 + C6 )
int dcsIndex = 0;
// code:
for (int i = 0; i < 9; i++, dcsIndex++) {
m_dcsWord[dcsIndex] = (dcsCode >> i) & 1;
}
// filler (0x04)
m_dcsWord[dcsIndex++] = 0;
m_dcsWord[dcsIndex++] = 0;
m_dcsWord[dcsIndex++] = 1;
// parity
for (int i = 0; i < 11; i++, dcsIndex++) {
m_dcsWord[dcsIndex] = p[i];
}
m_step = 0;
}
void NFMModDCS::setPositive(bool positive)
{
m_positive = positive;
m_step = 0;
}
void NFMModDCS::setSampleRate(int sampleRate)
{
m_bitPerStep = m_codeRate / sampleRate;
m_step = 0;
}
int NFMModDCS::next()
{
int dcsIndex = (int) m_step;
int carrier = (m_dcsWord[dcsIndex] == 1) ? (m_positive ? 1 : -1) : (m_positive ? -1 : 1);
if (m_step + m_bitPerStep < 23) {
m_step += m_bitPerStep;
} else {
m_step = m_step + m_bitPerStep - 23;
}
return carrier;
}

43
plugins/channeltx/modnfm/nfmmoddcs.h Normal file
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@ -0,0 +1,43 @@
///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2021 Edouard Griffiths, F4EXB //
// //
// 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/>. //
///////////////////////////////////////////////////////////////////////////////////
#ifndef PLUGINS_CHANNELTX_MODNFM_NFMMODDCS_H_
#define PLUGINS_CHANNELTX_MODNFM_NFMMODDCS_H_
class NFMModDCS
{
public:
NFMModDCS();
~NFMModDCS();
void reset();
void setDCS(int code);
void setPositive(bool positive);
void setSampleRate(int sampleRate);
int next(); //!< +1/-1 sample
private:
int m_shift; //!< current frequency shift: -1 or 1
int m_dcsWord[23]; //!< current DCS word in transmit order including parity and filler 11 + 3 + 9
float m_step;
bool m_positive;
float m_bitPerStep;
static const float m_codeRate;
};
#endif // PLUGINS_CHANNELTX_MODNFM_NFMMODDCS_H_

35
plugins/channeltx/modnfm/nfmmodgui.cpp
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@ -20,6 +20,7 @@
#include <QFileDialog>
#include <QTime>
#include <QDebug>
#include <QRegExp>
#include "device/deviceuiset.h"
#include "plugin/pluginapi.h"
@ -299,10 +300,35 @@ void NFMModGUI::on_ctcss_currentIndexChanged(int index)
void NFMModGUI::on_ctcssOn_toggled(bool checked)
{
ui->dcsOn->setEnabled(!checked);
m_settings.m_ctcssOn = checked;
applySettings();
}
void NFMModGUI::on_dcsOn_toggled(bool checked)
{
ui->ctcssOn->setEnabled(!checked);
m_settings.m_dcsOn = checked;
applySettings();
}
void NFMModGUI::on_dcsCode_editingFinished()
{
bool ok;
int dcsCode = ui->dcsCode->text().toInt(&ok, 8);
if (ok)
{
m_settings.m_dcsCode = dcsCode;
applySettings();
}
}
void NFMModGUI::on_dcsPositive_toggled(bool checked)
{
m_settings.m_dcsPositive = checked;
applySettings();
}
void NFMModGUI::configureFileName()
{
@ -375,7 +401,8 @@ NFMModGUI::NFMModGUI(PluginAPI* pluginAPI, DeviceUISet *deviceUISet, BasebandSam
m_audioSampleRate(-1),
m_feedbackAudioSampleRate(-1),
m_tickCount(0),
m_enableNavTime(false)
m_enableNavTime(false),
m_dcsCodeValidator(QRegExp("[0-7]{1,3}"))
{
ui->setupUi(this);
setAttribute(Qt::WA_DeleteOnClose, true);
@ -431,6 +458,7 @@ NFMModGUI::NFMModGUI(PluginAPI* pluginAPI, DeviceUISet *deviceUISet, BasebandSam
ui->ctcss->addItem(QString("%1").arg((double) NFMModSettings::getCTCSSFreq(i), 0, 'f', 1));
}
ui->dcsCode->setValidator(&m_dcsCodeValidator);
ui->cwKeyerGUI->setCWKeyer(m_nfmMod->getCWKeyer());
connect(getInputMessageQueue(), SIGNAL(messageEnqueued()), this, SLOT(handleSourceMessages()));
@ -500,6 +528,11 @@ void NFMModGUI::displaySettings()
ui->ctcssOn->setChecked(m_settings.m_ctcssOn);
ui->ctcss->setCurrentIndex(m_settings.m_ctcssIndex);
ui->dcsOn->setChecked(m_settings.m_dcsOn);
ui->dcsOn->setEnabled(!m_settings.m_ctcssOn);
ui->dcsCode->setText(tr("%1").arg(m_settings.m_dcsCode, 3, 8, QLatin1Char('0')));
ui->dcsPositive->setChecked(m_settings.m_dcsPositive);
ui->channelMute->setChecked(m_settings.m_channelMute);
ui->playLoop->setChecked(m_settings.m_playLoop);

6
plugins/channeltx/modnfm/nfmmodgui.h
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@ -18,6 +18,8 @@
#ifndef PLUGINS_CHANNELTX_MODNFM_NFMMODGUI_H_
#define PLUGINS_CHANNELTX_MODNFM_NFMMODGUI_H_
#include <QRegExpValidator>
#include "channel/channelgui.h"
#include "dsp/channelmarker.h"
#include "util/movingaverage.h"
@ -70,6 +72,7 @@ private:
bool m_enableNavTime;
NFMModSettings::NFMModInputAF m_modAFInput;
MessageQueue m_inputMessageQueue;
QRegExpValidator m_dcsCodeValidator;
explicit NFMModGUI(PluginAPI* pluginAPI, DeviceUISet *deviceUISet, BasebandSampleSource *channelTx, QWidget* parent = 0);
virtual ~NFMModGUI();
@ -107,6 +110,9 @@ private slots:
void on_ctcss_currentIndexChanged(int index);
void on_ctcssOn_toggled(bool checked);
void on_dcsOn_toggled(bool checked);
void on_dcsCode_editingFinished();
void on_dcsPositive_toggled(bool checked);
void on_feedbackEnable_toggled(bool checked);
void on_feedbackVolume_valueChanged(int value);

61
plugins/channeltx/modnfm/nfmmodgui.ui
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@ -673,6 +673,67 @@
</property>
</widget>
</item>
<item>
<widget class="QLabel" name="dcsLabel">
<property name="text">
<string>DCS</string>
</property>
</widget>
</item>
<item>
<widget class="QCheckBox" name="dcsOn">
<property name="toolTip">
<string>Activate DCS</string>
</property>
<property name="text">
<string/>
</property>
</widget>
</item>
<item>
<widget class="QLineEdit" name="dcsCode">
<property name="minimumSize">
<size>
<width>40</width>
<height>0</height>
</size>
</property>
<property name="maximumSize">
<size>
<width>40</width>
<height>16777215</height>
</size>
</property>
<property name="focusPolicy">
<enum>Qt::ClickFocus</enum>
</property>
<property name="acceptDrops">
<bool>false</bool>
</property>
<property name="toolTip">
<string>DCS code (octal)</string>
</property>
<property name="text">
<string>023</string>
</property>
<property name="alignment">
<set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
</property>
</widget>
</item>
<item>
<widget class="QCheckBox" name="dcsPositive">
<property name="toolTip">
<string>DCS code is positive (1 corresponds to positive frequency shift)</string>
</property>
<property name="layoutDirection">
<enum>Qt::RightToLeft</enum>
</property>
<property name="text">
<string>+</string>
</property>
</widget>
</item>
<item>
<spacer name="horizontalSpacer_4">
<property name="orientation">

10
plugins/channeltx/modnfm/nfmmodsettings.cpp
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@ -62,6 +62,9 @@ void NFMModSettings::resetToDefaults()
m_playLoop = false;
m_ctcssOn = false;
m_ctcssIndex = 0;
m_dcsOn = false;
m_dcsCode = 0023;
m_dcsPositive = false;
m_rgbColor = QColor(255, 0, 0).rgb();
m_title = "NFM Modulator";
m_modAFInput = NFMModInputAF::NFMModInputNone;
@ -113,6 +116,9 @@ QByteArray NFMModSettings::serialize() const
s.writeReal(21, m_feedbackVolumeFactor);
s.writeBool(22, m_feedbackAudioEnable);
s.writeS32(23, m_streamIndex);
s.writeBool(24, m_dcsOn);
s.writeS32(25, m_dcsCode);
s.writeBool(26, m_dcsPositive);
return s.final();
}
@ -186,6 +192,10 @@ bool NFMModSettings::deserialize(const QByteArray& data)
d.readReal(21, &m_feedbackVolumeFactor, 1.0);
d.readBool(22, &m_feedbackAudioEnable, false);
d.readS32(23, &m_streamIndex, 0);
d.readBool(24, &m_dcsOn, false);
d.readS32(25, &tmp, 0023);
m_dcsCode = tmp < 0 ? 0 : tmp > 511 ? 511 : tmp;
d.readBool(26, &m_dcsPositive, false);
return true;
}

3
plugins/channeltx/modnfm/nfmmodsettings.h
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@ -51,6 +51,9 @@ struct NFMModSettings
bool m_playLoop;
bool m_ctcssOn;
int m_ctcssIndex;
bool m_dcsOn;
int m_dcsCode;
bool m_dcsPositive;
quint32 m_rgbColor;
QString m_title;
NFMModInputAF m_modAFInput;

11
plugins/channeltx/modnfm/nfmmodsource.cpp
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@ -152,6 +152,8 @@ void NFMModSource::modulateSample()
if (m_settings.m_ctcssOn) {
t1 = (0.85f * m_bandpass.filter(t) + 0.15f * 0.625f * m_ctcssNco.next()) * 1.2f;
} else if (m_settings.m_dcsOn) {
t1 = (0.9f * m_bandpass.filter(t) + 0.1f * 0.625f * m_dcsMod.next()) * 1.2f;
} else {
t1 = m_bandpass.filter(t) * 1.2f;
}
@ -344,6 +346,7 @@ void NFMModSource::applyAudioSampleRate(int sampleRate)
m_bandpass.create(301, sampleRate, 300.0, m_settings.m_afBandwidth);
m_toneNco.setFreq(m_settings.m_toneFrequency, sampleRate);
m_ctcssNco.setFreq(NFMModSettings::getCTCSSFreq(m_settings.m_ctcssIndex), sampleRate);
m_dcsMod.setSampleRate(sampleRate);
m_cwKeyer.setSampleRate(sampleRate);
m_cwKeyer.reset();
m_preemphasisFilter.configure(m_preemphasis*sampleRate);
@ -400,6 +403,14 @@ void NFMModSource::applySettings(const NFMModSettings& settings, bool force)
m_ctcssNco.setFreq(NFMModSettings::getCTCSSFreq(settings.m_ctcssIndex), m_audioSampleRate);
}
if ((settings.m_dcsCode != m_settings.m_dcsCode) || force) {
m_dcsMod.setDCS(settings.m_dcsCode);
}
if ((settings.m_dcsPositive != m_settings.m_dcsPositive) || force) {
m_dcsMod.setPositive(settings.m_dcsPositive);
}
if ((settings.m_modAFInput != m_settings.m_modAFInput) || force)
{
if (settings.m_modAFInput == NFMModSettings::NFMModInputAudio) {

2
plugins/channeltx/modnfm/nfmmodsource.h
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@ -36,6 +36,7 @@
#include "audio/audiofifo.h"
#include "nfmmodsettings.h"
#include "nfmmoddcs.h"
class ChannelAPI;
@ -78,6 +79,7 @@ private:
NCO m_carrierNco;
NCOF m_toneNco;
NCOF m_ctcssNco;
NFMModDCS m_dcsMod;
float m_modPhasor; //!< baseband modulator phasor
Complex m_modSample;

12
plugins/channeltx/modnfm/readme.md
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@ -248,3 +248,15 @@ This is the audio file play length in time units
<h3>23: Play file position slider</h3>
This slider can be used to randomly set the current position in the file when file play is in pause state (button 18.3)
<h3>24: DCS switch</h3>
Checkbox to switch on the DCS (Digital Code Squelch) sub-audio modulation.
<h3>25: DCS code</h3>
This is the DCS octal code (0..511 in decimal 0..777 in octal)
<h3>26: DCS positive modulation</h3>
When checked the "1" bits are represented with positive shift frequency and "0" with negative shift. When unchecked (negative modulation) this is the opposite.