Spectrum averaging: fixed average (1)

plugins/channelrx/demodbfm/bfmdemodgui.cpp

@@ -359,7 +359,7 @@ BFMDemodGUI::BFMDemodGUI(PluginAPI* pluginAPI, DeviceUISet *deviceUISet, Baseban
 	ui->glSpectrum->setDisplayWaterfall(false);
 	ui->glSpectrum->setDisplayMaxHold(false);
 	ui->glSpectrum->setSsbSpectrum(true);
-	m_spectrumVis->configure(m_spectrumVis->getInputMessageQueue(), 64, 10, 0, FFTWindow::BlackmanHarris);
+	m_spectrumVis->configure(m_spectrumVis->getInputMessageQueue(), 64, 10, 0, 0, FFTWindow::BlackmanHarris);
 	connect(&MainWindow::getInstance()->getMasterTimer(), SIGNAL(timeout()), this, SLOT(tick()));
 
 	m_channelMarker.blockSignals(true);

plugins/channelrx/udpsrc/udpsrcgui.cpp

@@ -187,7 +187,7 @@ UDPSrcGUI::UDPSrcGUI(PluginAPI* pluginAPI, DeviceUISet *deviceUISet, BasebandSam
 	ui->glSpectrum->setSampleRate(ui->sampleRate->text().toInt());
 	ui->glSpectrum->setDisplayWaterfall(true);
 	ui->glSpectrum->setDisplayMaxHold(true);
-	m_spectrumVis->configure(m_spectrumVis->getInputMessageQueue(), 64, 10, 0, FFTWindow::BlackmanHarris);
+	m_spectrumVis->configure(m_spectrumVis->getInputMessageQueue(), 64, 10, 0, 0, FFTWindow::BlackmanHarris);
 
 	ui->glSpectrum->connectTimer(MainWindow::getInstance()->getMasterTimer());
 	connect(&MainWindow::getInstance()->getMasterTimer(), SIGNAL(timeout()), this, SLOT(tick()));

plugins/channeltx/udpsink/udpsinkgui.cpp

@@ -142,7 +142,7 @@ UDPSinkGUI::UDPSinkGUI(PluginAPI* pluginAPI, DeviceUISet *deviceUISet, BasebandS
     ui->glSpectrum->setSampleRate(ui->sampleRate->text().toInt());
     ui->glSpectrum->setDisplayWaterfall(true);
     ui->glSpectrum->setDisplayMaxHold(true);
-    m_spectrumVis->configure(m_spectrumVis->getInputMessageQueue(), 64, 10, 0, FFTWindow::BlackmanHarris);
+    m_spectrumVis->configure(m_spectrumVis->getInputMessageQueue(), 64, 10, 0, 0, FFTWindow::BlackmanHarris);
 
     ui->glSpectrum->connectTimer(MainWindow::getInstance()->getMasterTimer());
     connect(&MainWindow::getInstance()->getMasterTimer(), SIGNAL(timeout()), this, SLOT(tick()));

sdrbase/util/fixedaverage2d.h

@@ -0,0 +1,121 @@
+///////////////////////////////////////////////////////////////////////////////////
+// Copyright (C) 2018 F4EXB                                                      //
+// written by Edouard Griffiths                                                  //
+//                                                                               //
+// 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                  //
+//                                                                               //
+// 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 SDRBASE_UTIL_FIXEDAVERAGE2D_H_
+#define SDRBASE_UTIL_FIXEDAVERAGE2D_H_
+
+#include <algorithm>
+
+template<typename T>
+class FixedAverage2D
+{
+public:
+    FixedAverage2D() : m_sum(0), m_sumSize(0), m_width(0), m_size(0), m_avgIndex(0) {}
+
+    ~FixedAverage2D()
+    {
+        if (m_sum) {
+            delete[] m_sum;
+        }
+    }
+
+    void resize(unsigned int width, unsigned int size)
+    {
+        if (width > m_sumSize)
+        {
+            m_sumSize = width;
+            if (m_sum) {
+                delete[] m_sum;
+            }
+            m_sum = new T[m_sumSize];
+        }
+
+        m_width = width;
+        m_size = size;
+
+        std::fill(m_sum, m_sum+m_width, 0);
+        m_avgIndex = 0;
+    }
+
+    bool storeAndGetAvg(T& avg, T v, unsigned int index)
+    {
+        if (m_size <= 1)
+        {
+            avg = v;
+            return true;
+        }
+
+        m_sum[index] += v;
+
+        if (m_avgIndex == m_size - 1)
+        {
+            avg = m_sum[index]/m_size;
+            return true;
+        }
+        else
+        {
+            return false;
+        }
+    }
+
+    bool storeAndGetSum(T& sum, T v, unsigned int index)
+    {
+        if (m_size <= 1)
+        {
+            sum = v;
+            return true;
+        }
+
+        m_sum[index] += v;
+
+        if (m_avgIndex < m_size - 1)
+        {
+            sum = m_sum[index];
+            return true;
+        }
+        else
+        {
+            return false;
+        }
+    }
+
+    bool nextAverage()
+    {
+        if (m_avgIndex == m_size - 1)
+        {
+            m_avgIndex = 0;
+            std::fill(m_sum, m_sum+m_width, 0);
+            return true;
+        }
+        else
+        {
+            m_avgIndex++;
+            return false;
+        }
+    }
+
+private:
+    T *m_sum;
+    unsigned int m_sumSize;
+    unsigned int m_width;
+    unsigned int m_size;
+    unsigned int m_avgIndex;
+};
+
+
+
+#endif /* SDRBASE_UTIL_FIXEDAVERAGE2D_H_ */

sdrgui/dsp/spectrumvis.cpp

@@ -26,11 +26,12 @@ SpectrumVis::SpectrumVis(Real scalef, GLSpectrum* glSpectrum) :
 	m_scalef(scalef),
 	m_glSpectrum(glSpectrum),
 	m_averageNb(0),
+	m_averagingMode(AvgModeMoving),
 	m_ofs(0),
 	m_mutex(QMutex::Recursive)
 {
 	setObjectName("SpectrumVis");
-	handleConfigure(1024, 0, 0, FFTWindow::BlackmanHarris);
+	handleConfigure(1024, 0, 0, AvgModeMoving, FFTWindow::BlackmanHarris);
 }
 
 SpectrumVis::~SpectrumVis()
@@ -38,9 +39,14 @@ SpectrumVis::~SpectrumVis()
 	delete m_fft;
 }
 
-void SpectrumVis::configure(MessageQueue* msgQueue, int fftSize, int overlapPercent, unsigned int averagingNb, FFTWindow::Function window)
+void SpectrumVis::configure(MessageQueue* msgQueue,
+        int fftSize,
+        int overlapPercent,
+        unsigned int averagingNb,
+        int averagingMode,
+        FFTWindow::Function window)
 {
-	MsgConfigureSpectrumVis* cmd = new MsgConfigureSpectrumVis(fftSize, overlapPercent, averagingNb, window);
+	MsgConfigureSpectrumVis* cmd = new MsgConfigureSpectrumVis(fftSize, overlapPercent, averagingNb, averagingMode, window);
 	msgQueue->push(cmd);
 }
 
@@ -105,13 +111,15 @@ void SpectrumVis::feed(const SampleVector::const_iterator& cbegin, const SampleV
 			Real v;
 			std::size_t halfSize = m_fftSize / 2;
 
+			if (m_averagingMode == AvgModeMoving)
+			{
 	            if ( positiveOnly )
 	            {
 	                for (std::size_t i = 0; i < halfSize; i++)
 	                {
 	                    c = fftOut[i];
 	                    v = c.real() * c.real() + c.imag() * c.imag();
-					v = m_average.storeAndGetAvg(v, i);
+	                    v = m_movingAverage.storeAndGetAvg(v, i);
 	                    v = m_mult * log2f(v) + m_ofs;
 	                    m_logPowerSpectrum[i * 2] = v;
 	                    m_logPowerSpectrum[i * 2 + 1] = v;
@@ -123,13 +131,13 @@ void SpectrumVis::feed(const SampleVector::const_iterator& cbegin, const SampleV
 	                {
 	                    c = fftOut[i + halfSize];
 	                    v = c.real() * c.real() + c.imag() * c.imag();
-					v = m_average.storeAndGetAvg(v, i+halfSize);
+	                    v = m_movingAverage.storeAndGetAvg(v, i+halfSize);
 	                    v = m_mult * log2f(v) + m_ofs;
 	                    m_logPowerSpectrum[i] = v;
 
 	                    c = fftOut[i];
 	                    v = c.real() * c.real() + c.imag() * c.imag();
-                    v = m_average.storeAndGetAvg(v, i);
+	                    v = m_movingAverage.storeAndGetAvg(v, i);
 	                    v = m_mult * log2f(v) + m_ofs;
 	                    m_logPowerSpectrum[i + halfSize] = v;
 	                }
@@ -137,7 +145,57 @@ void SpectrumVis::feed(const SampleVector::const_iterator& cbegin, const SampleV
 
 	            // send new data to visualisation
 	            m_glSpectrum->newSpectrum(m_logPowerSpectrum, m_fftSize);
-			m_average.nextAverage();
+	            m_movingAverage.nextAverage();
+			}
+			else if (m_averagingMode == AvgModeFixed)
+			{
+			    double avg;
+
+                if ( positiveOnly )
+                {
+                    for (std::size_t i = 0; i < halfSize; i++)
+                    {
+                        c = fftOut[i];
+                        v = c.real() * c.real() + c.imag() * c.imag();
+
+                        if (m_fixedAverage.storeAndGetAvg(avg, v, i))
+                        {
+                            avg = m_mult * log2f(avg) + m_ofs;
+                            m_logPowerSpectrum[i * 2] = avg;
+                            m_logPowerSpectrum[i * 2 + 1] = avg;
+                        }
+                    }
+                }
+                else
+                {
+                    for (std::size_t i = 0; i < halfSize; i++)
+                    {
+                        c = fftOut[i + halfSize];
+                        v = c.real() * c.real() + c.imag() * c.imag();
+
+                        if (m_fixedAverage.storeAndGetAvg(avg, v, i+halfSize))
+                        { // result available
+                            avg = m_mult * log2f(avg) + m_ofs;
+                            m_logPowerSpectrum[i] = avg;
+                        }
+
+                        c = fftOut[i];
+                        v = c.real() * c.real() + c.imag() * c.imag();
+
+                        if (m_fixedAverage.storeAndGetAvg(avg, v, i))
+                        { // result available
+                            avg = m_mult * log2f(avg) + m_ofs;
+                            m_logPowerSpectrum[i + halfSize] = avg;
+                        }
+                    }
+                }
+
+                if (m_fixedAverage.nextAverage())
+                { // result available
+                    // send new data to visualisation
+                    m_glSpectrum->newSpectrum(m_logPowerSpectrum, m_fftSize);
+                }
+			}
 
 			// advance buffer respecting the fft overlap factor
 			std::copy(m_fftBuffer.begin() + m_refillSize, m_fftBuffer.end(), m_fftBuffer.begin());
@@ -173,7 +231,11 @@ bool SpectrumVis::handleMessage(const Message& message)
 	if (MsgConfigureSpectrumVis::match(message))
 	{
 		MsgConfigureSpectrumVis& conf = (MsgConfigureSpectrumVis&) message;
-		handleConfigure(conf.getFFTSize(), conf.getOverlapPercent(), conf.getAverageNb(), conf.getWindow());
+		handleConfigure(conf.getFFTSize(),
+		        conf.getOverlapPercent(),
+		        conf.getAverageNb(),
+		        conf.getAveragingMode(),
+		        conf.getWindow());
 		return true;
 	}
 	else
@@ -182,7 +244,11 @@ bool SpectrumVis::handleMessage(const Message& message)
 	}
 }
 
-void SpectrumVis::handleConfigure(int fftSize, int overlapPercent, unsigned int averageNb, FFTWindow::Function window)
+void SpectrumVis::handleConfigure(int fftSize,
+        int overlapPercent,
+        unsigned int averageNb,
+        AveragingMode averagingMode,
+        FFTWindow::Function window)
 {
 	QMutexLocker mutexLocker(&m_mutex);
 
@@ -214,7 +280,9 @@ void SpectrumVis::handleConfigure(int fftSize, int overlapPercent, unsigned int
 	m_overlapSize = (m_fftSize * m_overlapPercent) / 100;
 	m_refillSize = m_fftSize - m_overlapSize;
 	m_fftBufferFill = m_overlapSize;
-	m_average.resize(fftSize, averageNb);
+	m_movingAverage.resize(fftSize, averageNb);
+	m_fixedAverage.resize(fftSize, averageNb);
 	m_averageNb = averageNb;
+	m_averagingMode = averagingMode;
 	m_ofs = 20.0f * log10f(1.0f / m_fftSize);
 }

sdrgui/dsp/spectrumvis.h

@@ -8,6 +8,7 @@
 #include "export.h"
 #include "util/message.h"
 #include "util/movingaverage2d.h"
+#include "util/fixedaverage2d.h"
 
 class GLSpectrum;
 class MessageQueue;
@@ -15,34 +16,49 @@ class MessageQueue;
 class SDRGUI_API SpectrumVis : public BasebandSampleSink {
 
 public:
+    enum AveragingMode
+    {
+        AvgModeMoving,
+        AvgModeFixed
+    };
+
 	class MsgConfigureSpectrumVis : public Message {
 		MESSAGE_CLASS_DECLARATION
 
 	public:
-		MsgConfigureSpectrumVis(int fftSize, int overlapPercent, unsigned int averageNb, FFTWindow::Function window) :
+		MsgConfigureSpectrumVis(int fftSize, int overlapPercent, unsigned int averageNb, int averagingMode, FFTWindow::Function window) :
 			Message(),
 			m_fftSize(fftSize),
 			m_overlapPercent(overlapPercent),
 			m_averageNb(averageNb),
 			m_window(window)
-		{ }
+		{
+		    m_averagingMode = averagingMode < 0 ? AvgModeMoving : averagingMode > 1 ? AvgModeFixed : (SpectrumVis::AveragingMode) averagingMode;
+		}
 
 		int getFFTSize() const { return m_fftSize; }
 		int getOverlapPercent() const { return m_overlapPercent; }
 		unsigned int getAverageNb() const { return m_averageNb; }
+		SpectrumVis::AveragingMode getAveragingMode() const { return m_averagingMode; }
 		FFTWindow::Function getWindow() const { return m_window; }
 
 	private:
 		int m_fftSize;
 		int m_overlapPercent;
 		unsigned int m_averageNb;
+		SpectrumVis::AveragingMode m_averagingMode;
 		FFTWindow::Function m_window;
 	};
 
 	SpectrumVis(Real scalef, GLSpectrum* glSpectrum = 0);
 	virtual ~SpectrumVis();
 
-	void configure(MessageQueue* msgQueue, int fftSize, int overlapPercent, unsigned int averagingNb, FFTWindow::Function window);
+	void configure(MessageQueue* msgQueue,
+	        int fftSize,
+	        int overlapPercent,
+	        unsigned int averagingNb,
+	        int averagingMode,
+	        FFTWindow::Function window);
 
 	virtual void feed(const SampleVector::const_iterator& begin, const SampleVector::const_iterator& end, bool positiveOnly);
 	void feedTriggered(const SampleVector::const_iterator& triggerPoint, const SampleVector::const_iterator& end, bool positiveOnly);
@@ -66,15 +82,21 @@ private:
 
 	Real m_scalef;
 	GLSpectrum* m_glSpectrum;
-	MovingAverage2D<double> m_average;
+	MovingAverage2D<double> m_movingAverage;
+	FixedAverage2D<double> m_fixedAverage;
 	unsigned int m_averageNb;
+	AveragingMode m_averagingMode;
 
 	Real m_ofs;
 	static const Real m_mult;
 
 	QMutex m_mutex;
 
-	void handleConfigure(int fftSize, int overlapPercent, unsigned int averageNb, FFTWindow::Function window);
+	void handleConfigure(int fftSize,
+	        int overlapPercent,
+	        unsigned int averageNb,
+	        AveragingMode averagingMode,
+	        FFTWindow::Function window);
 };
 
 #endif // INCLUDE_SPECTRUMVIS_H

sdrgui/gui/glspectrumgui.cpp

@@ -191,7 +191,12 @@ void GLSpectrumGUI::applySettings()
 	m_glSpectrum->setDisplayGridIntensity(m_displayGridIntensity);
 
 	if (m_spectrumVis) {
-	    m_spectrumVis->configure(m_messageQueue, m_fftSize, m_fftOverlap, m_averagingNb, (FFTWindow::Function)m_fftWindow);
+	    m_spectrumVis->configure(m_messageQueue,
+	            m_fftSize,
+	            m_fftOverlap,
+	            m_averagingNb,
+	            m_averagingMode,
+	            (FFTWindow::Function)m_fftWindow);
 	}
 }
 
@@ -199,7 +204,12 @@ void GLSpectrumGUI::on_fftWindow_currentIndexChanged(int index)
 {
 	m_fftWindow = index;
 	if(m_spectrumVis != 0) {
-        m_spectrumVis->configure(m_messageQueue, m_fftSize, m_fftOverlap, m_averagingNb, (FFTWindow::Function)m_fftWindow);
+        m_spectrumVis->configure(m_messageQueue,
+                m_fftSize,
+                m_fftOverlap,
+                m_averagingNb,
+                m_averagingMode,
+                (FFTWindow::Function)m_fftWindow);
 	}
 }
 
@@ -207,12 +217,26 @@ void GLSpectrumGUI::on_fftSize_currentIndexChanged(int index)
 {
 	m_fftSize = 1 << (7 + index);
 	if(m_spectrumVis != 0) {
-	    m_spectrumVis->configure(m_messageQueue, m_fftSize, m_fftOverlap, m_averagingNb, (FFTWindow::Function)m_fftWindow);
+	    m_spectrumVis->configure(m_messageQueue,
+	            m_fftSize,
+	            m_fftOverlap,
+	            m_averagingNb,
+                m_averagingMode,
+	            (FFTWindow::Function)m_fftWindow);
 	}
 }
 
-void GLSpectrumGUI::on_averagingMode_currentIndexChanged(int index __attribute__((unused)))
+void GLSpectrumGUI::on_averagingMode_currentIndexChanged(int index)
 {
+    m_averagingMode = index < 0 ? AvgModeMoving : index > 1 ? AvgModeFixed : (AveragingMode) index;
+    if(m_spectrumVis != 0) {
+        m_spectrumVis->configure(m_messageQueue,
+                m_fftSize,
+                m_fftOverlap,
+                m_averagingNb,
+                m_averagingMode,
+                (FFTWindow::Function)m_fftWindow);
+    }
 }
 
 void GLSpectrumGUI::on_averaging_currentIndexChanged(int index)
@@ -220,7 +244,12 @@ void GLSpectrumGUI::on_averaging_currentIndexChanged(int index)
     m_averagingIndex = index;
     m_averagingNb = getAveragingValue(index);
     if(m_spectrumVis != 0) {
-        m_spectrumVis->configure(m_messageQueue, m_fftSize, m_fftOverlap, m_averagingNb, (FFTWindow::Function)m_fftWindow);
+        m_spectrumVis->configure(m_messageQueue,
+                m_fftSize,
+                m_fftOverlap,
+                m_averagingNb,
+                m_averagingMode,
+                (FFTWindow::Function)m_fftWindow);
     }
 }