File biquad.h¶

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Source Code¶

/*
Copyright (c) 2023 Electrosmith, Corp, Hans Mikelson, Matt Gerassimoff, John ffitch, Steven Yi

Use of this source code is governed by the LGPL V2.1
license that can be found in the LICENSE file or at
https://opensource.org/license/lgpl-2-1/
*/

#pragma once
#ifndef DSY_BIQUAD_H
#define DSY_BIQUAD_H

#include <stdint.h>
#ifdef __cplusplus

namespace daisysp
{
class Biquad
{
  public:
    Biquad() {}
    ~Biquad() {}
    void Init(float sample_rate);


    float Process(float in);


    inline void SetRes(float res)
    {
        res_ = res;
        Reset();
    }


    inline void SetCutoff(float cutoff)
    {
        cutoff_ = cutoff;
        Reset();
    }

  private:
    float sample_rate_, cutoff_, res_, b0_, b1_, b2_, a0_, a1_, a2_,
        two_pi_d_sr_, xnm1_, xnm2_, ynm1_, ynm2_;
    void Reset();
};
} // namespace daisysp
#endif
#endif