mirror of
https://github.com/thestk/stk
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54 lines
1.3 KiB
C++
54 lines
1.3 KiB
C++
/*******************************************/
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/* Two Zero Filter Class, */
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/* by Perry R. Cook, 1995-96 */
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/* See books on filters to understand */
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/* more about how this works. Nothing */
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/* out of the ordinary in this version. */
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/*******************************************/
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#include "TwoZero.h"
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TwoZero :: TwoZero() : Filter()
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{
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inputs = (MY_FLOAT *) malloc(2 * sizeof(MY_FLOAT));
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zeroCoeffs[0] = (MY_FLOAT) 0.0;
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zeroCoeffs[1] = (MY_FLOAT) 0.0;
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gain = (MY_FLOAT) 1.0;
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this->clear();
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}
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TwoZero :: ~TwoZero()
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{
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free(inputs);
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}
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void TwoZero :: clear()
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{
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inputs[0] = (MY_FLOAT) 0.0;
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inputs[1] = (MY_FLOAT) 0.0;
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lastOutput = (MY_FLOAT) 0.0;
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}
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void TwoZero :: setZeroCoeffs(MY_FLOAT *coeffs)
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{
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zeroCoeffs[0] = coeffs[0];
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zeroCoeffs[1] = coeffs[1];
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}
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void TwoZero :: setGain(MY_FLOAT aValue)
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{
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gain = aValue;
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}
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MY_FLOAT TwoZero :: tick(MY_FLOAT sample) // Perform Filter Operation
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{ // TwoZero is a two zero filter (duh!)
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// Look it up in your favorite DSP text
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lastOutput = zeroCoeffs[0] * inputs[0];
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lastOutput += zeroCoeffs[1] * inputs[1];
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inputs[1] = inputs[0];
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inputs[0] = gain * sample;
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lastOutput += inputs[0];
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return lastOutput;
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}
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