phaser.h

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/*
Copyright (c) 2020 Electrosmith, Corp
 
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_PHASER_H
#define DSY_PHASER_H
#ifdef __cplusplus
 
#include <stdint.h>
#include "Utility/delayline.h"
 
namespace daisysp
{
class PhaserEngine
{
  public:
    PhaserEngine() {}
    ~PhaserEngine() {}
 
    void Init(float sample_rate);
 
    float Process(float in);
 
    void SetLfoDepth(float depth);
 
    void SetLfoFreq(float lfo_freq);
 
    void SetFreq(float ap_freq);
 
    void SetFeedback(float feedback);
 
  private:
    float                    sample_rate_;
    static constexpr int32_t kDelayLength
        = 2400; // 50 ms at 48kHz = .05 * 48000
 
    //triangle lfo
    float lfo_phase_;
    float lfo_freq_;
    float lfo_amp_;
 
    float os_;
 
    float feedback_;
    float ap_freq_;
 
    float deltime_;
    float last_sample_;
 
    DelayLine<float, kDelayLength> del_;
 
    float ProcessLfo();
};
 
//wraps up all of the phaser engines
class Phaser
{
  public:
    Phaser() {}
    ~Phaser() {}
 
    void Init(float sample_rate);
 
    float Process(float in);
 
    void SetPoles(int poles);
 
    void SetLfoDepth(float depth);
 
    void SetLfoFreq(float lfo_freq);
 
    void SetFreq(float ap_freq);
 
    void SetFeedback(float feedback);
 
  private:
    static constexpr int kMaxPoles = 8;
    PhaserEngine         engines_[kMaxPoles];
    float                gain_frac_;
    int                  poles_;
};
} //namespace daisysp
#endif
#endif