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https://github.com/thestk/stk
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74 lines
1.7 KiB
C++
74 lines
1.7 KiB
C++
/***************************************************/
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/*! \class PoleZero
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\brief STK one-pole, one-zero filter class.
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This class implements a one-pole, one-zero digital filter. A
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method is provided for creating an allpass filter with a given
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coefficient. Another method is provided to create a DC blocking
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filter.
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by Perry R. Cook and Gary P. Scavone, 1995-2012.
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*/
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/***************************************************/
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#include "PoleZero.h"
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namespace stk {
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PoleZero :: PoleZero()
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{
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// Default setting for pass-through.
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b_.resize( 2, 0.0 );
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a_.resize( 2, 0.0 );
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b_[0] = 1.0;
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a_[0] = 1.0;
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inputs_.resize( 2, 1, 0.0 );
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outputs_.resize( 2, 1, 0.0 );
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}
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PoleZero :: ~PoleZero()
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{
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}
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void PoleZero :: setCoefficients( StkFloat b0, StkFloat b1, StkFloat a1, bool clearState )
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{
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if ( std::abs( a1 ) >= 1.0 ) {
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oStream_ << "PoleZero::setCoefficients: a1 argument (" << a1 << ") should be less than 1.0!";
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handleError( StkError::WARNING ); return;
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}
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b_[0] = b0;
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b_[1] = b1;
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a_[1] = a1;
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if ( clearState ) this->clear();
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}
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void PoleZero :: setAllpass( StkFloat coefficient )
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{
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if ( std::abs( coefficient ) >= 1.0 ) {
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oStream_ << "PoleZero::setAllpass: argument (" << coefficient << ") makes filter unstable!";
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handleError( StkError::WARNING ); return;
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}
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b_[0] = coefficient;
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b_[1] = 1.0;
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a_[0] = 1.0; // just in case
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a_[1] = coefficient;
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}
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void PoleZero :: setBlockZero( StkFloat thePole )
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{
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if ( std::abs( thePole ) >= 1.0 ) {
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oStream_ << "PoleZero::setBlockZero: argument (" << thePole << ") makes filter unstable!";
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handleError( StkError::WARNING ); return;
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}
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b_[0] = 1.0;
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b_[1] = -1.0;
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a_[0] = 1.0; // just in case
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a_[1] = -thePole;
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}
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} // stk namespace
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