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34 lines
595 B
34 lines
595 B
#include "tone.h"
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#include <math.h>
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#include "../utility/dsp.h"
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using namespace daisysp;
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void Tone::Init(float sample_rate)
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{
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prevout_ = 0.0f;
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freq_ = 100.0f;
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c1_ = 0.5f;
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c2_ = 0.5f;
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sample_rate_ = sample_rate;
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}
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float Tone::Process(float &in)
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{
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float out;
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out = c1_ * in + c2_ * prevout_;
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prevout_ = out;
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return out;
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}
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void Tone::CalculateCoefficients()
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{
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float b, c1, c2;
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b = 2.0f - cosf(TWOPI_F * freq_ / sample_rate_);
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c2 = b - sqrtf(b * b - 1.0f);
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c1 = 1.0f - c2;
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c1_ = c1;
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c2_ = c2;
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}
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