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33 lines
586 B
33 lines
586 B
#include <math.h>
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#include <stdlib.h>
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#define ROOT2 (1.4142135623730950488)
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#ifndef M_PI
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#define M_PI 3.14159265358979323846
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#endif
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#include "port.h"
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using namespace daisysp;
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void Port::Init(float sample_rate, float htime)
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{
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yt1_ = 0;
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prvhtim_ = -100.0;
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htime_ = htime;
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sample_rate_ = sample_rate;
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onedsr_ = 1.0 / sample_rate_;
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}
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float Port::Process(float in)
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{
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if(prvhtim_ != htime_)
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{
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c2_ = pow(0.5, onedsr_ / htime_);
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c1_ = 1.0 - c2_;
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prvhtim_ = htime_;
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}
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return yt1_ = c1_ * in + c2_ * yt1_;
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}
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