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FP-Audio-lib/filter_moog.h

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#ifndef filter_moog_h_
#define filter_moog_h_
#include "Arduino.h"
#include "AudioStream.h"
#include "arm_math.h"
class AudioFilterMoog: public AudioStream
{
float g;
float q;
float driv;
float oct;
float basef;
float y_a;
float y_b;
float y_c;
float y_d;
float y_d_1;
public:
AudioFilterMoog() : AudioStream(2, inputQueueArray) {
frequency(1000);
resonance(1);
drive(1);
octave(1);
y_a = 0;
y_b = 0;
y_c = 0;
y_d = 0;
y_d_1 = 0;
}
void resonance(float qi) {
if (qi < 0.7) qi = 0.7;
else if (qi > 5.0) qi = 5.0;
q=qi;
}
void drive(float d) {
if (d > 10.0f) d = 10.0f;
if (d < 0.1f) d = 0.1f;
driv = d;
}
void octave(float n) {
if (n < 0.0) n = 0.0;
else if (n > 6.9999) n = 6.9999;
oct=n;
}
void frequency(float freq,bool setf=true) {
if (freq < 20.0) freq = 20.0;
else if (freq > AUDIO_SAMPLE_RATE_EXACT/2.5) freq = AUDIO_SAMPLE_RATE_EXACT/2.5;
g = 1 - expf(-2 * tanf(2 * M_PI * freq/(2 * AUDIO_SAMPLE_RATE_EXACT)));
if(setf)
basef=freq;
}
virtual void update(void);
private:
void update_fixed(const int16_t *in,int16_t *lp);
void update_variable(const int16_t *in, const int16_t *ctl, int16_t *lp);
audio_block_t *inputQueueArray[2];
};
#endif