EngineFilterButterworth8::EngineFilterButterworth8(filterType type, int sampleRate, double freqCorner1, double freqCorner2)
{
m_type = type;
switch(type)
{
case FILTER_LOWPASS:
m_bufSize = 8;
Q_ASSERT(freqCorner2 == 0);
m_coef[0] = 1 * fid_design_coef(m_coef + 1, 8, "LpBu8", sampleRate, freqCorner1, 0, 0);
break;
case FILTER_BANDPASS:
m_bufSize = 16;
m_coef[0]= 1 * fid_design_coef(m_coef + 1, 16, "BpBu8", sampleRate, freqCorner1, freqCorner2, 0);
break;
case FILTER_HIGHPASS:
m_bufSize = 8;
Q_ASSERT(freqCorner2 == 0);
m_coef[0] = 1 * fid_design_coef(m_coef + 1, 8, "HpBu8", sampleRate, freqCorner1, 0, 0);
break;
}
//Initialize Buffers
for(int i=0; i < m_bufSize; i++)
{
m_buf1[i] = 0;
m_buf2[i] = 0;
}
}
void EngineFilterButterworth8High::setFrequencyCorners(int sampleRate,
double freqCorner1) {
m_sampleRate = sampleRate;
// Copy the old coefficients into m_oldCoef
memcpy(m_oldCoef, m_coef, MAX_COEFS * sizeof(double));
m_coef[0] = fid_design_coef(m_coef + 1, 8, "HpBu8", m_sampleRate,
freqCorner1, 0, 0);
initBuffers();
m_doRamping = true;
}
void EngineFilterButterworth8High::setFrequencyCorners(double freqCorner1) {
m_coef[0] = 1 * fid_design_coef(m_coef + 1, 8, "HpBu8", m_sampleRate,
freqCorner1, 0, 0);
initBuffers();
}
void EngineFilterButterworth8Band::setFrequencyCorners(double freqCorner1,
double freqCorner2) {
m_coef[0]= 1 * fid_design_coef(m_coef + 1, 16, "BpBu8", m_sampleRate,
freqCorner1, freqCorner2, 0);
initBuffers();
}
