int EngineFilterBessel8Low::setFrequencyCornersForIntDelay(
double desiredCorner1Ratio, int maxDelay) {
// these values are calculated using the phase returned by
// fid_response_pha() at corner / 20
// group delay at 1 Hz freqCorner1 and 1 Hz Samplerate
const double kDelayFactor1 = 0.506051799;
// Factor, required to hit the end of the quadratic curve
const double kDelayFactor2 = 1.661247;
// Table for the non quadratic, high part near the sample rate
const double delayRatioTable[] = {
0.500000000, // delay 0
0.321399282, // delay 1
0.213843537, // delay 2
0.155141284, // delay 3
0.120432232, // delay 4
0.097999886, // delay 5
0.082451739, // delay 6
0.071098408, // delay 7
0.062444910, // delay 8
0.055665936, // delay 9
0.050197933, // delay 10
0.045689120, // delay 11
0.041927420, // delay 12
0.038735202, // delay 13
0.035992756, // delay 14
0.033611618, // delay 15
0.031525020, // delay 16
0.029681641, // delay 17
0.028041409, // delay 18
0.026572562, // delay 19
};
double dDelay = kDelayFactor1 / desiredCorner1Ratio - kDelayFactor2 * desiredCorner1Ratio;
int iDelay = math_clamp((int)(dDelay + 0.5), 0, maxDelay);
double quantizedRatio;
if (iDelay >= (int)(sizeof(delayRatioTable) / sizeof(double))) {
// pq formula, only valid for low frequencies
quantizedRatio = (-(iDelay / kDelayFactor2 / 2)) +
sqrt((iDelay / kDelayFactor2 / 2)*(iDelay / kDelayFactor2 / 2)
+ kDelayFactor1 / kDelayFactor2);
} else {
quantizedRatio = delayRatioTable[iDelay];
}
setCoefs("LpBe8", 1, quantizedRatio);
return iDelay;
}
void TransactionWidget::createActions()
{
clearAction = new QAction( this );
clearAction->setText( tr("Clear coefficients for the selected deals") );
setCoefAction = new QAction( this );
setCoefAction->setText( tr("Set coefficients for the selected deals...") );
reloadAction = new QAction( this );
reloadAction->setText( tr("Reload") );
reloadAction->setShortcut( tr("Ctrl+R") );
reloadAction->setIcon( QIcon(":/TransactionRecord/Resources/reload.png") );
toolBar->addAction( setCoefAction, 0 );
toolBar->addAction( clearAction, 0, 1 );
toolBar->addAction( reloadAction, 0 );
connect( setCoefAction, SIGNAL( triggered() ), this, SLOT( setCoefs() ) );
connect( clearAction, SIGNAL( triggered() ), this, SLOT( clearCoefs() ) );
connect( reloadAction, SIGNAL( triggered() ), this, SLOT( reload() ) );
}
void EngineFilterBessel8Low::setFrequencyCorners(int sampleRate,
double freqCorner1) {
// Copy the old coefficients into m_oldCoef
setCoefs("LpBe8", sampleRate, freqCorner1);
}
void EngineFilterBessel8High::setFrequencyCorners(int sampleRate,
double freqCorner1) {
setCoefs("HpBe8", sampleRate, freqCorner1);
}
void EngineFilterBessel8Band::setFrequencyCorners(int sampleRate,
double freqCorner1,
double freqCorner2) {
setCoefs("BpBe8", sampleRate, freqCorner1, freqCorner2);
}
void EngineFilterButterworth8High::setFrequencyCorners(int sampleRate,
double freqCorner1) {
setCoefs("HpBu8", sampleRate, freqCorner1);
}
void EngineFilterButterworth8Band::setFrequencyCorners(int sampleRate,
double freqCorner1,
double freqCorner2) {
setCoefs("BpBu8", sampleRate, freqCorner1, freqCorner2);
}
