Filters.h

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/*
 * Filters.h
 *
 *  Created on: Feb 13, 2020
 *      Author: Yannick
 */
 
#ifndef FILTERS_H_
#define FILTERS_H_
#include "cppmain.h"
 
#ifdef __cplusplus
 
// Frequency in hz, q in float q*100. Example: Q 0.5 -> 50
struct biquad_constant_t {
    uint16_t freq;
    uint8_t q;
};
 
enum class BiquadType : uint8_t {
    lowpass = 0,
    highpass,
    bandpass,
    notch,
    peak,
    lowshelf,
    highshelf
};
 
class TMC4671Biquad;
class Biquad{
    friend TMC4671Biquad;
public:
    Biquad();
    Biquad(BiquadType type, float Fc, float Q, float peakGainDB);
    ~Biquad();
    float process(float in);
    void setBiquad(BiquadType type, float Fc, float Q, float peakGain);
    void setFc(float Fc); //frequency
    float getFc() const;
    void setQ(float Q);
    float getQ() const;
    void calcBiquad(void);
 
protected:
 
    BiquadType type;
    float a0, a1, a2, b1, b2;
    float Fc, Q, peakGain;
    float z1, z2;
};
 
 
#endif
 
#endif /* FILTERS_H_ */