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Version 4.4.0

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This commit is contained in:
Gary Scavone
2013-09-29 23:11:39 +02:00
committed by Stephen Sinclair
parent d199342e86
commit eccd8c9981
287 changed files with 11712 additions and 7676 deletions
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82
src/TwoPole.cpp
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@@ -2,25 +2,28 @@
/*! \class TwoPole
\brief STK two-pole filter class.
This protected Filter subclass implements
a two-pole digital filter. A method is
provided for creating a resonance in the
frequency response while maintaining a nearly
constant filter gain.
This class implements a two-pole digital filter. A method is
provided for creating a resonance in the frequency response while
maintaining a nearly constant filter gain.
by Perry R. Cook and Gary P. Scavone, 1995 - 2007.
by Perry R. Cook and Gary P. Scavone, 1995 - 2009.
*/
/***************************************************/
#include "TwoPole.h"
#include <math.h>
#include <cmath>
TwoPole :: TwoPole() : Filter()
namespace stk {
TwoPole :: TwoPole( void )
{
std::vector<StkFloat> b(1, 1.0);
std::vector<StkFloat> a(3, 0.0);
a[0] = 1.0;
Filter::setCoefficients( b, a );
b_.resize( 1 );
a_.resize( 3 );
inputs_.resize( 1, 1, 0.0 );
outputs_.resize( 3, 1, 0.0 );
b_[0] = 1.0;
a_[0] = 1.0;
Stk::addSampleRateAlert( this );
}
@@ -37,27 +40,7 @@ void TwoPole :: sampleRateChanged( StkFloat newRate, StkFloat oldRate )
}
}
void TwoPole :: clear(void)
{
Filter::clear();
}
void TwoPole :: setB0(StkFloat b0)
{
b_[0] = b0;
}
void TwoPole :: setA1(StkFloat a1)
{
a_[1] = a1;
}
void TwoPole :: setA2(StkFloat a2)
{
a_[2] = a2;
}
void TwoPole :: setResonance(StkFloat frequency, StkFloat radius, bool normalize)
void TwoPole :: setResonance( StkFloat frequency, StkFloat radius, bool normalize )
{
a_[2] = radius * radius;
a_[1] = (StkFloat) -2.0 * radius * cos(TWO_PI * frequency / Stk::sampleRate());
@@ -70,32 +53,13 @@ void TwoPole :: setResonance(StkFloat frequency, StkFloat radius, bool normalize
}
}
void TwoPole :: setGain(StkFloat gain)
void TwoPole :: setCoefficients( StkFloat b0, StkFloat a1, StkFloat a2, bool clearState )
{
Filter::setGain(gain);
b_[0] = b0;
a_[1] = a1;
a_[2] = a2;
if ( clearState ) this->clear();
}
StkFloat TwoPole :: getGain(void) const
{
return Filter::getGain();
}
StkFloat TwoPole :: lastOut(void) const
{
return Filter::lastOut();
}
StkFloat TwoPole :: tick( StkFloat input )
{
inputs_[0] = gain_ * input;
outputs_[0] = b_[0] * inputs_[0] - a_[2] * outputs_[2] - a_[1] * outputs_[1];
outputs_[2] = outputs_[1];
outputs_[1] = outputs_[0];
return outputs_[0];
}
StkFrames& TwoPole :: tick( StkFrames& frames, unsigned int channel )
{
return Filter::tick( frames, channel );
}
} // stk namespace