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DSD demod: highpass filtering for audio completed

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f4exb
2017-12-26 20:29:23 +01:00
parent e1d7ada5dd
commit 2145eeb7b6
15 changed files with 174 additions and 78 deletions
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sdrbase/dsp/filtermbe.cpp
+11 -28
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@@ -17,40 +17,23 @@
#include "filtermbe.h"
const float MBEAudioInterpolatorFilter::m_a0 = 3.869430E-02;
const float MBEAudioInterpolatorFilter::m_a1 = 7.738860E-02;
const float MBEAudioInterpolatorFilter::m_a2 = 3.869430E-02;
const float MBEAudioInterpolatorFilter::m_b1 = 1.392667E+00;
const float MBEAudioInterpolatorFilter::m_b2 = -5.474446E-01;
const float MBEAudioInterpolatorFilter::m_lpa[3] = {1.0, 1.392667E+00, -5.474446E-01};
const float MBEAudioInterpolatorFilter::m_lpb[3] = {3.869430E-02, 7.738860E-02, 3.869430E-02};
MBEAudioInterpolatorFilter::MBEAudioInterpolatorFilter()
const float MBEAudioInterpolatorFilter::m_hpa[3] = {1.000000e+00, 1.911437E+00, -9.155749E-01};
const float MBEAudioInterpolatorFilter::m_hpb[3] = {9.567529E-01, -1.913506E+00, 9.567529E-01};
MBEAudioInterpolatorFilter::MBEAudioInterpolatorFilter() :
m_filterLP(m_lpa, m_lpb),
m_filterHP(m_hpa, m_hpb),
m_useHP(false)
{
init();
}
MBEAudioInterpolatorFilter::~MBEAudioInterpolatorFilter()
{}
void MBEAudioInterpolatorFilter::init()
float MBEAudioInterpolatorFilter::run(const float& sample)
{
m_x[0] = 0.0f;
m_x[1] = 0.0f;
m_y[0] = 0.0f;
m_y[1] = 0.0f;
return m_useHP ? m_filterLP.run(m_filterHP.run(sample)) : m_filterLP.run(sample);
}
float MBEAudioInterpolatorFilter::run(float sample)
{
float y = m_a0*sample + m_a1*m_x[0] + m_a2*m_x[1] + m_b1*m_y[0] + m_b2*m_y[1]; // this is y[n]
m_x[1] = m_x[0];
m_x[0] = sample;
m_y[1] = m_y[0];
m_y[0] = y;
return y;
}