mirror of
https://github.com/thestk/stk
synced 2026-01-12 12:31:53 +00:00
62 lines
1.4 KiB
C++
62 lines
1.4 KiB
C++
/***************************************************/
|
|
/*! \class OnePole
|
|
\brief STK one-pole filter class.
|
|
|
|
This class implements a one-pole digital filter. A method is
|
|
provided for setting the pole position along the real axis of the
|
|
z-plane while maintaining a constant peak filter gain.
|
|
|
|
by Perry R. Cook and Gary P. Scavone, 1995--2014.
|
|
*/
|
|
/***************************************************/
|
|
|
|
#include "OnePole.h"
|
|
|
|
namespace stk {
|
|
|
|
OnePole :: OnePole( StkFloat thePole )
|
|
{
|
|
b_.resize( 1 );
|
|
a_.resize( 2 );
|
|
a_[0] = 1.0;
|
|
inputs_.resize( 1, 1, 0.0 );
|
|
outputs_.resize( 2, 1, 0.0 );
|
|
|
|
this->setPole( thePole );
|
|
}
|
|
|
|
OnePole :: ~OnePole()
|
|
{
|
|
}
|
|
|
|
void OnePole :: setPole( StkFloat thePole )
|
|
{
|
|
if ( std::abs( thePole ) >= 1.0 ) {
|
|
oStream_ << "OnePole::setPole: argument (" << thePole << ") should be less than 1.0!";
|
|
handleError( StkError::WARNING ); return;
|
|
}
|
|
|
|
// Normalize coefficients for peak unity gain.
|
|
if ( thePole > 0.0 )
|
|
b_[0] = (StkFloat) (1.0 - thePole);
|
|
else
|
|
b_[0] = (StkFloat) (1.0 + thePole);
|
|
|
|
a_[1] = -thePole;
|
|
}
|
|
|
|
void OnePole :: setCoefficients( StkFloat b0, StkFloat a1, bool clearState )
|
|
{
|
|
if ( std::abs( a1 ) >= 1.0 ) {
|
|
oStream_ << "OnePole::setCoefficients: a1 argument (" << a1 << ") should be less than 1.0!";
|
|
handleError( StkError::WARNING ); return;
|
|
}
|
|
|
|
b_[0] = b0;
|
|
a_[1] = a1;
|
|
|
|
if ( clearState ) this->clear();
|
|
}
|
|
|
|
} // stk namespace
|