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Test source: added AM and FM modulations

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This commit is contained in:
f4exb
2018-02-11 13:48:17 +01:00
parent 4b2dfd488e
commit 1d9ab62a4a
9 changed files with 481 additions and 138 deletions
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plugins/samplesource/testsource/testsourcethread.cpp
+69 -3
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@@ -31,6 +31,11 @@ TestSourceThread::TestSourceThread(SampleSinkFifo* sampleFifo, QObject* parent)
m_convertBuffer(TESTSOURCE_BLOCKSIZE),
m_sampleFifo(sampleFifo),
m_frequencyShift(0),
m_toneFrequency(440),
m_modulation(TestSourceSettings::ModulationNone),
m_amModulation(0.5f),
m_fmDeviationUnit(0.0f),
m_fmPhasor(0.0f),
m_samplerate(48000),
m_log2Decim(4),
m_fcPos(0),
@@ -81,6 +86,7 @@ void TestSourceThread::setSamplerate(int samplerate)
m_chunksize = 4 * ((m_samplerate * (m_throttlems+(m_throttleToggle ? 1 : 0))) / 1000);
m_throttleToggle = !m_throttleToggle;
m_nco.setFreq(m_frequencyShift, m_samplerate);
m_toneNco.setFreq(m_toneFrequency, m_samplerate);
}
void TestSourceThread::setLog2Decimation(unsigned int log2_decim)
@@ -149,6 +155,28 @@ void TestSourceThread::setFrequencyShift(int shift)
m_nco.setFreq(shift, m_samplerate);
}
void TestSourceThread::setToneFrequency(int toneFrequency)
{
m_toneNco.setFreq(toneFrequency, m_samplerate);
}
void TestSourceThread::setModulation(TestSourceSettings::Modulation modulation)
{
m_modulation = modulation;
}
void TestSourceThread::setAMModulation(float amModulation)
{
m_amModulation = amModulation < 0.0f ? 0.0f : amModulation > 1.0f ? 1.0f : amModulation;
}
void TestSourceThread::setFMDeviation(float deviation)
{
float fmDeviationUnit = deviation / (float) m_samplerate;
m_fmDeviationUnit = fmDeviationUnit < 0.0f ? 0.0f : fmDeviationUnit > 1.0f ? 1.0f : fmDeviationUnit;
qDebug("TestSourceThread::setFMDeviation: m_fmDeviationUnit: %f", m_fmDeviationUnit);
}
void TestSourceThread::run()
{
m_running = true;
@@ -195,14 +223,52 @@ void TestSourceThread::generate(quint32 chunksize)
for (int i = 0; i < n-1;)
{
Complex c = m_nco.nextIQ(m_phaseImbalance);
m_buf[i++] = (int16_t) (c.real() * (float) m_amplitudeBitsI) + m_amplitudeBitsDC;
m_buf[i++] = (int16_t) (c.imag() * (float) m_amplitudeBitsQ);
switch (m_modulation)
{
case TestSourceSettings::ModulationAM:
{
Complex c = m_nco.nextIQ();
Real t, re, im;
pullAF(t);
t = (t*m_amModulation + 1.0f)*0.5f;
re = c.real()*t;
im = c.imag()*t + m_phaseImbalance*re;
m_buf[i++] = (int16_t) (re * (float) m_amplitudeBitsI) + m_amplitudeBitsDC;
m_buf[i++] = (int16_t) (im * (float) m_amplitudeBitsQ);
}
break;
case TestSourceSettings::ModulationFM:
{
Complex c = m_nco.nextIQ();
Real t, re, im;
pullAF(t);
m_fmPhasor += m_fmDeviationUnit * t;
m_fmPhasor = m_fmPhasor < -1.0f ? -m_fmPhasor - 1.0f : m_fmPhasor > 1.0f ? m_fmPhasor - 1.0f : m_fmPhasor;
re = c.real()*cos(m_fmPhasor*M_PI) - c.imag()*sin(m_fmPhasor*M_PI);
im = (c.real()*sin(m_fmPhasor*M_PI) + c.imag()*cos(m_fmPhasor*M_PI)) + m_phaseImbalance*re;
m_buf[i++] = (int16_t) (re * (float) m_amplitudeBitsI) + m_amplitudeBitsDC;
m_buf[i++] = (int16_t) (im * (float) m_amplitudeBitsQ);
}
break;
case TestSourceSettings::ModulationNone:
default:
{
Complex c = m_nco.nextIQ(m_phaseImbalance);
m_buf[i++] = (int16_t) (c.real() * (float) m_amplitudeBitsI) + m_amplitudeBitsDC;
m_buf[i++] = (int16_t) (c.imag() * (float) m_amplitudeBitsQ);
}
break;
}
}
callback(m_buf, n);
}
void TestSourceThread::pullAF(Real& afSample)
{
afSample = m_toneNco.next();
}
// call appropriate conversion (decimation) routine depending on the number of sample bits
void TestSourceThread::callback(const qint16* buf, qint32 len)
{