mirror of
https://github.com/thestk/stk
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50 lines
1.0 KiB
C++
50 lines
1.0 KiB
C++
/***************************************************/
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/*! \class OneZero
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\brief STK one-zero filter class.
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This class implements a one-zero digital filter. A method is
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provided for setting the zero position along the real axis of the
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z-plane while maintaining a constant filter gain.
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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 "OneZero.h"
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#include <cmath>
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namespace stk {
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OneZero :: OneZero( StkFloat theZero )
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{
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b_.resize( 2 );
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inputs_.resize( 2, 1, 0.0 );
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this->setZero( theZero );
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}
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OneZero :: ~OneZero( void )
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{
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}
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void OneZero :: setZero( StkFloat theZero )
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{
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// Normalize coefficients for unity gain.
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if ( theZero > 0.0 )
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b_[0] = 1.0 / ((StkFloat) 1.0 + theZero);
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else
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b_[0] = 1.0 / ((StkFloat) 1.0 - theZero);
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b_[1] = -theZero * b_[0];
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}
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void OneZero :: setCoefficients( StkFloat b0, StkFloat b1, bool clearState )
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{
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b_[0] = b0;
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b_[1] = b1;
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if ( clearState ) this->clear();
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}
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} // stk namespace
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