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Add an interpolate method to the Interpolator class

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This commit is contained in:
f4exb 2016-10-10 02:08:48 +02:00
parent 6707bab1a5
commit aa45dcbd17
1 changed files with 27 additions and 0 deletions
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27
sdrbase/dsp/interpolator.h
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@ -35,6 +35,24 @@ public:
return true;
}
// interpolation works nearly the same way
bool interpolate(Real *distance, const Complex& next, Complex* result)
{
*distance -= 1.0;
if (*distance < 1.0) // use sample
{
advanceFilter(next);
doInterpolate((int) floor(*distance * (Real)m_phaseSteps), result);
return true; // need new input sample and increment distance
}
else // use zero
{
advanceFilter();
doInterpolate((int) floor(*distance * (Real)m_phaseSteps), result);
return false; // input sample was not used and do not increment distance
}
}
private:
float* m_taps;
@ -56,6 +74,15 @@ private:
m_samples[m_ptr] = next;
}
void advanceFilter()
{
m_ptr--;
if(m_ptr < 0)
m_ptr = m_nTaps - 1;
m_samples[m_ptr].real(0.0);
m_samples[m_ptr].imag(0.0);
}
void doInterpolate(int phase, Complex* result)
{
if (phase < 0)