formantosc.h

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/*
Copyright (c) 2020 Electrosmith, Corp, Emilie Gillet
 
Use of this source code is governed by an MIT-style
license that can be found in the LICENSE file or at
https://opensource.org/licenses/MIT.
*/
 
#pragma once
#ifndef DSY_FORMANTOSCILLATOR_H
#define DSY_FORMANTOSCILLATOR_H
 
#include <stdint.h>
#ifdef __cplusplus
 
namespace daisysp
{
class FormantOscillator
{
  public:
    FormantOscillator() {}
    ~FormantOscillator() {}
 
    void Init(float sample_rate);
 
    float Process();
 
    void SetFormantFreq(float freq);
 
    void SetCarrierFreq(float freq);
 
    void SetPhaseShift(float ps);
 
  private:
    inline float Sine(float phase);
    inline float ThisBlepSample(float t);
    inline float NextBlepSample(float t);
 
    // Oscillator state.
    float carrier_phase_;
    float formant_phase_;
    float next_sample_;
 
    // For interpolation of parameters.
    float carrier_frequency_;
    float formant_frequency_;
    float phase_shift_;
    float ps_inc_;
 
    float sample_rate_;
 
    //DISALLOW_COPY_AND_ASSIGN(FormantOscillator);
};
} //namespace daisysp
#endif
#endif