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