ref: 3c589589f3e0d97dff5f8af730f218a959036d0f
dir: /LEAF/Inc_cpp/leaf-filter.hpp/
/*
==============================================================================
LEAFFilter.h
Created: 20 Jan 2017 12:01:10pm
Author: Michael R Mulshine
==============================================================================
*/
#ifndef LEAFFILTER_H_INCLUDED
#define LEAFFILTER_H_INCLUDED
// ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
#include "leaf-globals.h"
#include "leaf-math.h"
#include "leaf-wavetables.h"
// ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
/* tOnePole: OnePole filter, reimplemented from STK (Cook and Scavone). */
typedef struct _tOnePole
{
float gain;
float a0,a1;
float b0,b1;
float lastIn, lastOut;
} tOnePole;
void tOnePole_init (tOnePole* const, float thePole);
void tOnePole_free (tOnePole* const);
float tOnePole_tick (tOnePole* const, float input);
void tOnePole_setB0 (tOnePole* const, float b0);
void tOnePole_setA1 (tOnePole* const, float a1);
void tOnePole_setPole (tOnePole* const, float thePole);
void tOnePole_setCoefficients(tOnePole* const, float b0, float a1);
void tOnePole_setGain (tOnePole* const, float gain);
// ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
/* TwoPole filter, reimplemented from STK (Cook and Scavone). */
typedef struct _tTwoPole
{
float gain;
float a0, a1, a2;
float b0;
float radius, frequency;
oBool normalize;
float lastOut[2];
} tTwoPole;
void tTwoPole_init (tTwoPole* const);
void tTwoPole_free (tTwoPole* const);
float tTwoPole_tick (tTwoPole* const, float input);
void tTwoPole_setB0 (tTwoPole* const, float b0);
void tTwoPole_setA1 (tTwoPole* const, float a1);
void tTwoPole_setA2 (tTwoPole* const, float a2);
void tTwoPole_setResonance (tTwoPole* const, float freq, float radius, oBool normalize);
void tTwoPole_setCoefficients(tTwoPole* const, float b0, float a1, float a2);
void tTwoPole_setGain (tTwoPole* const, float gain);
// ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
/* OneZero filter, reimplemented from STK (Cook and Scavone). */
typedef struct _tOneZero
{
float gain;
float b0,b1;
float lastIn, lastOut, frequency;
} tOneZero;
void tOneZero_init (tOneZero* const, float theZero);
void tOneZero_free (tOneZero* const);
float tOneZero_tick (tOneZero* const, float input);
void tOneZero_setB0 (tOneZero* const, float b0);
void tOneZero_setB1 (tOneZero* const, float b1);
void tOneZero_setZero (tOneZero* const, float theZero);
void tOneZero_setCoefficients(tOneZero* const, float b0, float b1);
void tOneZero_setGain (tOneZero* const, float gain);
float tOneZero_getPhaseDelay(tOneZero *f, float frequency );
// ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
/* TwoZero filter, reimplemented from STK (Cook and Scavone). */
typedef struct _tTwoZero
{
float gain;
float b0, b1, b2;
float frequency, radius;
float lastIn[2];
} tTwoZero;
void tTwoZero_init (tTwoZero* const);
void tTwoZero_free (tTwoZero* const);
float tTwoZero_tick (tTwoZero* const, float input);
void tTwoZero_setB0 (tTwoZero* const, float b0);
void tTwoZero_setB1 (tTwoZero* const, float b1);
void tTwoZero_setB2 (tTwoZero* const, float b2);
void tTwoZero_setNotch (tTwoZero* const, float frequency, float radius);
void tTwoZero_setCoefficients(tTwoZero* const, float b0, float b1, float b2);
void tTwoZero_setGain (tTwoZero* const, float gain);
// ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
/* PoleZero filter, reimplemented from STK (Cook and Scavone). */
typedef struct _tPoleZero
{
float gain;
float a0,a1;
float b0,b1;
float lastIn, lastOut;
} tPoleZero;
void tPoleZero_init (tPoleZero* const);
void tPoleZero_free (tPoleZero* const);
float tPoleZero_tick (tPoleZero* const, float input);
void tPoleZero_setB0 (tPoleZero* const, float b0);
void tPoleZero_setB1 (tPoleZero* const, float b1);
void tPoleZero_setA1 (tPoleZero* const, float a1);
void tPoleZero_setCoefficients (tPoleZero* const, float b0, float b1, float a1);
void tPoleZero_setAllpass (tPoleZero* const, float coeff);
void tPoleZero_setBlockZero (tPoleZero* const, float thePole);
void tPoleZero_setGain (tPoleZero* const, float gain);
// ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
/* BiQuad filter, reimplemented from STK (Cook and Scavone). */
typedef struct _tBiQuad
{
float gain;
float a0, a1, a2;
float b0, b1, b2;
float lastIn[2];
float lastOut[2];
float frequency, radius;
oBool normalize;
} tBiQuad;
void tBiQuad_init (tBiQuad* const);
void tBiQuad_free (tBiQuad* const);
float tBiQuad_tick (tBiQuad* const, float input);
void tBiQuad_setB0 (tBiQuad* const, float b0);
void tBiQuad_setB1 (tBiQuad* const, float b1);
void tBiQuad_setB2 (tBiQuad* const, float b2);
void tBiQuad_setA1 (tBiQuad* const, float a1);
void tBiQuad_setA2 (tBiQuad* const, float a2);
void tBiQuad_setNotch (tBiQuad* const, float freq, float radius);
void tBiQuad_setResonance (tBiQuad* const, float freq, float radius, oBool normalize);
void tBiQuad_setCoefficients(tBiQuad* const, float b0, float b1, float b2, float a1, float a2);
void tBiQuad_setGain (tBiQuad* const, float gain);
// ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
/* State Variable Filter, algorithm from Andy Simper. */
typedef enum SVFType
{
SVFTypeHighpass = 0,
SVFTypeLowpass,
SVFTypeBandpass,
SVFTypeNotch,
SVFTypePeak,
} SVFType;
typedef struct _tSVF
{
SVFType type;
float cutoff, Q;
float ic1eq,ic2eq;
float g,k,a1,a2,a3;
} tSVF;
void tSVF_init (tSVF* const, SVFType type, float freq, float Q);
void tSVF_free (tSVF* const);
float tSVF_tick (tSVF* const, float v0);
int tSVF_setFreq (tSVF* const, float freq);
int tSVF_setQ (tSVF* const, float Q);
// ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
/* Efficient State Variable Filter for 14-bit control input, [0, 4096). */
typedef struct _tSVFE
{
SVFType type;
float cutoff, Q;
float ic1eq,ic2eq;
float g,k,a1,a2,a3;
} tSVFE;
void tSVFE_init (tSVFE* const, SVFType type, uint16_t controlFreq, float Q);
void tSVFE_free (tSVFE* const);
float tSVFE_tick (tSVFE* const, float v0);
int tSVFE_setFreq (tSVFE* const, uint16_t controlFreq);
int tSVFE_setQ (tSVFE* const, float Q);
// ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
/* Simple Highpass filter. */
typedef struct _tHighpass
{
float xs, ys, R;
float frequency;
} tHighpass;
void tHighpass_init (tHighpass* const, float freq);
void tHighpass_free (tHighpass* const);
float tHighpass_tick (tHighpass* const, float x);
void tHighpass_setFreq (tHighpass* const, float freq);
float tHighpass_getFreq (tHighpass* const);
// ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
// Butterworth Filter
#define NUM_SVF_BW 16
typedef struct _tButterworth
{
float gain;
float N;
tSVF low[NUM_SVF_BW];
tSVF high[NUM_SVF_BW];
float f1,f2;
} tButterworth;
void tButterworth_init (tButterworth* const, int N, float f1, float f2);
void tButterworth_free (tButterworth* const);
float tButterworth_tick (tButterworth* const, float input);
void tButterworth_setF1 (tButterworth* const, float in);
void tButterworth_setF2 (tButterworth* const, float in);
void tButterworth_setFreqs (tButterworth* const, float f1, float f2);
// ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
#endif // LEAFFILTER_H_INCLUDED