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ATV Demod: implemented FFT filter and interpolator (for decimation and DSB filtering)
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f4exb
parent
f3e3549773
commit
aa566f0910
@ -29,6 +29,7 @@ MESSAGE_CLASS_DEFINITION(ATVDemod::MsgConfigureATVDemod, Message)
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MESSAGE_CLASS_DEFINITION(ATVDemod::MsgConfigureRFATVDemod, Message)
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const float ATVDemod::m_fltSecondToUs = 1000000.0f;
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const int ATVDemod::m_ssbFftLen = 1024;
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ATVDemod::ATVDemod() :
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m_objSettingsMutex(QMutex::NonRecursive),
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@ -48,7 +49,12 @@ ATVDemod::ATVDemod() :
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m_fltAmpMax(2000000000.0f),
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m_fltAmpDelta(1.0),
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m_fltAmpLineAverage(0.0f),
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m_intNumberSamplePerTop(0)
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m_intNumberSamplePerTop(0),
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m_interpolatorDistanceRemain(0.0f),
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m_interpolatorDistance(1.0f),
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m_DSBFilter(0),
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m_DSBFilterBuffer(0),
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m_DSBFilterBufferIndex(0)
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{
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setObjectName("ATVDemod");
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@ -60,9 +66,12 @@ ATVDemod::ATVDemod() :
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m_objMagSqAverage.resize(32, 1.0);
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m_DSBFilter = new fftfilt((2.0f * m_objRFConfig.m_fltRFBandwidth) / 1000000, 2 * m_ssbFftLen); // arbitrary 1 MS/s sample rate
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m_DSBFilterBuffer = new Complex[m_ssbFftLen];
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memset(m_DSBFilterBuffer, 0, sizeof(Complex)*(m_ssbFftLen));
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memset((void*)m_fltBufferI,0,6*sizeof(float));
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memset((void*)m_fltBufferQ,0,6*sizeof(float));
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}
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ATVDemod::~ATVDemod()
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@ -102,13 +111,15 @@ void ATVDemod::configureRF(
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ATVModulation enmModulation,
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float fltRFBandwidth,
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float fltRFOppBandwidth,
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bool blnFFTFiltering)
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bool blnFFTFiltering,
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bool blnDecimatorEnable)
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{
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Message* msgCmd = MsgConfigureRFATVDemod::create(
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enmModulation,
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fltRFBandwidth,
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fltRFOppBandwidth,
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blnFFTFiltering);
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blnFFTFiltering,
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blnDecimatorEnable);
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objMessageQueue->push(msgCmd);
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}
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@ -521,7 +532,8 @@ bool ATVDemod::handleMessage(const Message& cmd)
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<< " m_enmModulation" << m_objRFConfig.m_enmModulation
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<< " m_fltRFBandwidth" << m_objRFConfig.m_fltRFBandwidth
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<< " m_fltRFOppBandwidth" << m_objRFConfig.m_fltRFOppBandwidth
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<< " m_blnFFTFiltering" << m_objRFConfig.m_blnFFTFiltering;
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<< " m_blnFFTFiltering" << m_objRFConfig.m_blnFFTFiltering
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<< " m_blnDecimatorEnable" << m_objRFConfig.m_blndecimatorEnable;
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applySettings();
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@ -18,16 +18,18 @@
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#ifndef INCLUDE_ATVDEMOD_H
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#define INCLUDE_ATVDEMOD_H
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#include <dsp/basebandsamplesink.h>
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#include <dsp/devicesamplesource.h>
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#include <dsp/dspcommands.h>
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#include <dsp/downchannelizer.h>
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#include <QMutex>
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#include <QElapsedTimer>
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#include <vector>
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#include "dsp/basebandsamplesink.h"
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#include "dsp/devicesamplesource.h"
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#include "dsp/dspcommands.h"
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#include "dsp/downchannelizer.h"
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#include "dsp/nco.h"
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#include "dsp/interpolator.h"
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#include "dsp/movingaverage.h"
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#include "dsp/fftfilt.h"
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#include "dsp/agc.h"
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#include "audio/audiofifo.h"
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#include "util/message.h"
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@ -41,11 +43,11 @@ class ATVDemod : public BasebandSampleSink
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public:
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enum ATVModulation {
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ATV_FM1,
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ATV_FM2,
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ATV_AM,
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ATV_VAMU,
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ATV_VAML
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ATV_FM1, //!< Classical frequency modulation with discriminator #1
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ATV_FM2, //!< Classical frequency modulation with discriminator #2
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ATV_AM, //!< Classical amplitude modulation
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ATV_VAMU, //!< AM with vestigial lower side band (main signal is in the upper side)
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ATV_VAML //!< AM with vestigial upper side band (main signal is in the lower side)
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};
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struct ATVConfig
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@ -80,12 +82,14 @@ public:
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float m_fltRFBandwidth;
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float m_fltRFOppBandwidth;
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bool m_blnFFTFiltering;
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bool m_blndecimatorEnable;
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ATVRFConfig() :
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m_enmModulation(ATV_FM1),
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m_fltRFBandwidth(0),
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m_fltRFOppBandwidth(0),
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m_blnFFTFiltering(false)
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m_blnFFTFiltering(false),
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m_blndecimatorEnable(false)
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{
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}
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};
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@ -107,7 +111,8 @@ public:
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ATVModulation enmModulation,
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float fltRFBandwidth,
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float fltRFOppBandwidth,
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bool blnFFTFiltering);
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bool blnFFTFiltering,
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bool blndecimatorEnable);
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virtual void feed(const SampleVector::const_iterator& begin, const SampleVector::const_iterator& end, bool po);
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virtual void start();
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@ -180,13 +185,15 @@ private:
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ATVModulation enmModulation,
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float fltRFBandwidth,
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float fltRFOppBandwidth,
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bool blnFFTFiltering)
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bool blnFFTFiltering,
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bool blndecimatorEnable)
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{
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return new MsgConfigureRFATVDemod(
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enmModulation,
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fltRFBandwidth,
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fltRFOppBandwidth,
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blnFFTFiltering);
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blnFFTFiltering,
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blndecimatorEnable);
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}
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ATVRFConfig m_objMsgConfig;
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@ -196,7 +203,8 @@ private:
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ATVModulation enmModulation,
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float fltRFBandwidth,
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float fltRFOppBandwidth,
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bool blnFFTFiltering) :
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bool blnFFTFiltering,
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bool blndecimatorEnable) :
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Message()
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{
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m_objMsgConfig.m_enmModulation = enmModulation;
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@ -244,6 +252,17 @@ private:
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MovingAverage<double> m_objMagSqAverage;
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// Interpolator group for decimation and/or double sideband RF filtering
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Interpolator m_interpolator;
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Real m_interpolatorDistance;
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Real m_interpolatorDistanceRemain;
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// Used for vestigial SSB with asymmetrical filtering (needs double sideband scheme)
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fftfilt* m_DSBFilter;
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Complex* m_DSBFilterBuffer;
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int m_DSBFilterBufferIndex;
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static const int m_ssbFftLen;
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//QElapsedTimer m_objTimer;
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ATVConfig m_objRunning;
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@ -361,7 +361,8 @@ void ATVDemodGUI::applyRFSettings()
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(ATVDemod::ATVModulation) ui->modulation->currentIndex(),
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ui->rfBW->value() * 100000.0f,
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ui->rfOppBW->value() * 100000.0f,
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ui->rfFiltering->isChecked());
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ui->rfFiltering->isChecked(),
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ui->decimator->isChecked());
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}
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}
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@ -577,3 +578,9 @@ void ATVDemodGUI::on_rfFiltering_toggled(bool checked)
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m_blnDoApplySettings = true;
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applyRFSettings();
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}
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void ATVDemodGUI::on_decimator_toggled(bool checked)
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{
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applyRFSettings();
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}
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@ -75,6 +75,7 @@ private slots:
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void on_rfBW_valueChanged(int value);
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void on_rfOppBW_valueChanged(int value);
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void on_rfFiltering_toggled(bool checked);
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void on_decimator_toggled(bool checked);
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private:
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Ui::ATVDemodGUI* ui;
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@ -99,9 +99,16 @@
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</layout>
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</item>
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<item>
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<widget class="Line" name="line">
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<property name="orientation">
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<enum>Qt::Vertical</enum>
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<widget class="ButtonSwitch" name="decimator">
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<property name="text">
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<string/>
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</property>
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<property name="icon">
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<iconset resource="../../../sdrbase/resources/res.qrc">
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<normaloff>:/arrow_down.png</normaloff>:/arrow_down.png</iconset>
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</property>
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<property name="checkable">
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<bool>true</bool>
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</property>
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</widget>
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</item>
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