Simplify interpolator.

include-gpl/dsp/interpolator.h

@@ -17,17 +17,13 @@ public:
 	void create(int phaseSteps, double sampleRate, double cutoff);
 	void free();
 
-	bool interpolate(Real* distance, const Complex& next, bool* consumed, Complex* result)
+	// Original code allowed for upsampling, but was never used that way
+	bool interpolate(Real* distance, const Complex& next, Complex* result)
 	{
-		while(*distance >= 1.0) {
-			if(!(*consumed)) {
 		advanceFilter(next);
 		*distance -= 1.0;
-				*consumed = true;
+		if (*distance >= 1.0)
-			} else {
 			return false;
-			}
-		}
 		doInterpolate((int)floor(*distance * (Real)m_phaseSteps), result);
 		return true;
 	}

plugins/channel/nfm/nfmdemod.cpp

@@ -60,15 +60,13 @@ int framedrop = 0;
 void NFMDemod::feed(SampleVector::const_iterator begin, SampleVector::const_iterator end, bool positiveOnly)
 {
 	Complex ci;
-	bool consumed;
 	qint16 sample;
 
 	for(SampleVector::const_iterator it = begin; it < end; ++it) {
 		Complex c(it->real() / 32768.0, it->imag() / 32768.0);
 		c *= m_nco.nextIQ();
 
-		consumed = false;
+		if(m_interpolator.interpolate(&m_sampleDistanceRemain, c, &ci)) {
-		if(m_interpolator.interpolate(&m_sampleDistanceRemain, c, &consumed, &ci)) {
 			if (++framedrop & 1) {
 				m_movingAverage.feed(ci.real() * ci.real() + ci.imag() * ci.imag());
 				if(m_movingAverage.average() >= m_squelchLevel)

plugins/channel/ssb/ssbdemod.cpp

@@ -61,14 +61,12 @@ void SSBDemod::feed(SampleVector::const_iterator begin, SampleVector::const_iter
 	Complex ci;
 	cmplx *sideband;
 	int n_out;
-	bool consumed;
 
 	for(SampleVector::const_iterator it = begin; it < end; ++it) {
 		Complex c(it->real() / 32768.0, it->imag() / 32768.0);
 		c *= m_nco.nextIQ();
 
-		consumed = false;
+		if(m_interpolator.interpolate(&m_sampleDistanceRemain, c, &ci)) {
-		if(m_interpolator.interpolate(&m_sampleDistanceRemain, c, &consumed, &ci)) {
 			n_out = SSBFilter->run(ci, &sideband, m_usb);
 			m_sampleDistanceRemain += (Real)m_sampleRate / 48000.0;
 		} else

plugins/channel/tcpsrc/tcpsrc.cpp

@@ -13,8 +13,8 @@ TCPSrc::TCPSrc(MessageQueue* uiMessageQueue, TCPSrcGUI* tcpSrcGUI, SampleSink* s
 {
 	m_inputSampleRate = 100000;
 	m_sampleFormat = FormatS8;
-	m_outputSampleRate = 50000;
+	m_outputSampleRate = 48000;
-	m_rfBandwidth = 50000;
+	m_rfBandwidth = 40000;
 	m_tcpPort = 9999;
 	m_nco.setFreq(0, m_inputSampleRate);
 	m_interpolator.create(16, m_inputSampleRate, m_rfBandwidth / 2.1);
@@ -46,14 +46,11 @@ void TCPSrc::setSpectrum(MessageQueue* messageQueue, bool enabled)
 void TCPSrc::feed(SampleVector::const_iterator begin, SampleVector::const_iterator end, bool positiveOnly)
 {
 	Complex ci;
-	bool consumed;
-
 	for(SampleVector::const_iterator it = begin; it < end; ++it) {
 		Complex c(it->real() / 32768.0, it->imag() / 32768.0);
 		c *= m_nco.nextIQ();
 
-		consumed = false;
+		if(m_interpolator.interpolate(&m_sampleDistanceRemain, c, &ci)) {
-		if(m_interpolator.interpolate(&m_sampleDistanceRemain, c, &consumed, &ci)) {
 			m_sampleBuffer.push_back(Sample(ci.real() * 32768.0, ci.imag() * 32768.0));
 			m_sampleDistanceRemain += m_inputSampleRate / m_outputSampleRate;
 		}

plugins/channel/wfm/wfmdemod.cpp

@@ -31,7 +31,6 @@ WFMDemod::WFMDemod(AudioFifo* audioFifo, SampleSink* sampleSink) :
 	m_sampleRate = 250000;
 	m_frequency = 0;
 
-	m_nco.setFreq(m_frequency, m_sampleRate);
 	m_interpolator.create(16, m_sampleRate, 16000);
 	m_sampleDistanceRemain = (Real)m_sampleRate / 48000.0;
 
@@ -51,21 +50,16 @@ void WFMDemod::configure(MessageQueue* messageQueue, Real afBandwidth, Real volu
 
 void WFMDemod::feed(SampleVector::const_iterator begin, SampleVector::const_iterator end, bool positiveOnly)
 {
-	Complex ci;
-	bool consumed;
 	qint16 sample;
-	Real demod;
 
 	for(SampleVector::const_iterator it = begin; it < end; ++it) {
-		Complex c(it->real() , it->imag());
+		Complex c(it->real(), it->imag());
 		Complex d = c * conj(m_lastSample);
 		m_lastSample = c;
-		demod = atan2(d.imag(), d.real());
+		Complex e(atan2(d.imag(), d.real()), 0);
-		Complex e(demod * 3000 / M_PI, 0);
 
-		consumed = false;
+		if(m_interpolator.interpolate(&m_sampleDistanceRemain, e, &c)) {
-		if(m_interpolator.interpolate(&m_sampleDistanceRemain, e, &consumed, &ci)) {
+			sample = (qint16)(c.real() * m_volume * 800.0);
-			sample = (qint16)(ci.real() * m_volume);
 			m_sampleBuffer.push_back(Sample(sample, sample));
 			m_audioBuffer[m_audioBufferFill].l = sample;
 			m_audioBuffer[m_audioBufferFill].r = sample;
@@ -76,7 +70,6 @@ void WFMDemod::feed(SampleVector::const_iterator begin, SampleVector::const_iter
 					qDebug("lost %u samples", m_audioBufferFill - res);
 				m_audioBufferFill = 0;
 			}
-
 			m_sampleDistanceRemain += (Real)m_sampleRate / 48000.0;
 		}
 	}

plugins/channel/wfm/wfmdemod.h

@@ -20,9 +20,7 @@
 
 #include <vector>
 #include "dsp/samplesink.h"
-#include "dsp/nco.h"
 #include "dsp/interpolator.h"
-#include "dsp/lowpass.h"
 #include "audio/audiofifo.h"
 #include "util/message.h"
 
@@ -75,7 +73,6 @@ private:
 	int m_sampleRate;
 	int m_frequency;
 
-	NCO m_nco;
 	Interpolator m_interpolator;
 	Real m_sampleDistanceRemain;
 	Complex m_lastSample;