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Tx ph.2: use a specialized interpolator similar to the decimator derived from the ancient interpolator

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f4exb
2016-10-28 03:18:24 +02:00
parent 9540a99ac4
commit 4d273d8a13
4 changed files with 33 additions and 23 deletions
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plugins/channeltx/modam/ammod.cpp
+18 -7
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@@ -65,17 +65,28 @@ void AMMod::pull(Sample& sample)
{
Complex ci;
m_interpolator.interpolate(&m_interpolatorDistanceRemain, m_modSample, &m_interpolatorConsumed, &ci);
m_interpolatorDistanceRemain += m_interpolatorDistance;
// Resampler used for interpolation only
// m_interpolator.resample(&m_interpolatorDistanceRemain, m_modSample, &m_interpolatorConsumed, &ci);
// m_interpolatorDistanceRemain += m_interpolatorDistance;
//
// if (m_interpolatorConsumed)
// {
// Real t = m_toneNco.next();
// m_modSample.real(((t+1.0f) * m_running.m_modFactor * 16384.0f)); // modulate and scale zero frequency carrier
// m_modSample.imag(0.0f);
// m_interpolatorConsumed = false;
// }
if (m_interpolatorConsumed)
// Specialized interpolator
if (m_interpolator.interpolate(&m_interpolatorDistanceRemain, m_modSample, &ci))
{
Real t = m_toneNco.next();
m_modSample.real(((t+1.0f) * m_running.m_modFactor * 16384.0f)); // modulate and scale zero frequency carrier
m_modSample.imag(0.0f);
m_interpolatorConsumed = false;
Real t = m_toneNco.next();
m_modSample.real(((t+1.0f) * m_running.m_modFactor * 16384.0f)); // modulate and scale zero frequency carrier
m_modSample.imag(0.0f);
}
m_interpolatorDistanceRemain += m_interpolatorDistance;
ci *= m_carrierNco.nextIQ(); // shift to carrier frequency
Real magsq = ci.real() * ci.real() + ci.imag() * ci.imag();