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vibrato and polyphony paratmeters

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example_keyboards
Jack Humbert 9 years ago
parent d3fc077fa3
commit fd49dfe5cb
3 changed files with 249 additions and 159 deletions
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160
quantum/audio.c
Unescape Escape View File

@ -10,10 +10,13 @@
#include "eeconfig.h"
#include "vibrato_lut.h"
#define PI 3.14159265
#define CPU_PRESCALER 8
// Largely untested PWM audio mode (doesn't sound as good)
// #define PWM_AUDIO
#ifdef PWM_AUDIO
@ -67,10 +70,11 @@ bool note_resting = false;
uint8_t current_note = 0;
uint8_t rest_counter = 0;
uint8_t vibrato_counter = 0;
float vibrato_strength = 0;
float vibrato_counter = 0;
float vibrato_strength = .5;
float vibrato_rate = 0.125;
float polyphony_rate = 0;
float polyphony_rate = .5;
audio_config_t audio_config;
@ -90,6 +94,81 @@ void audio_off(void) {
eeconfig_write_audio(audio_config.raw);
}
// Vibrato rate functions
void set_vibrato_rate(float rate) {
vibrato_rate = rate;
}
void increase_vibrato_rate(float change) {
vibrato_rate *= change;
}
void decrease_vibrato_rate(float change) {
vibrato_rate /= change;
}
#ifdef VIBRATO_STRENGTH_ENABLE
void set_vibrato_strength(float strength) {
vibrato_strength = strength;
}
void increase_vibrato_strength(float change) {
vibrato_strength *= change;
}
void decrease_vibrato_strength(float change) {
vibrato_strength /= change;
}
#endif
// Polyphony functions
void set_polyphony_rate(float rate) {
polyphony_rate = rate;
}
void enable_polyphony() {
polyphony_rate = 5;
}
void disable_polyphony() {
polyphony_rate = 0;
}
void increase_polyphony_rate(float change) {
polyphony_rate *= change;
}
void decrease_polyphony_rate(float change) {
polyphony_rate /= change;
}
// Timbre function
void set_timbre(float timbre) {
note_timbre = timbre;
}
// Tempo functions
void set_tempo(float tempo) {
note_tempo = tempo;
}
void decrease_tempo(uint8_t tempo_change) {
note_tempo += (float) tempo_change;
}
void increase_tempo(uint8_t tempo_change) {
if (note_tempo - (float) tempo_change < 10) {
note_tempo = 10;
} else {
note_tempo -= (float) tempo_change;
}
}
void stop_all_notes() {
voices = 0;
@ -112,6 +191,7 @@ void stop_all_notes() {
void stop_note(double freq) {
if (note) {
cli();
#ifdef PWM_AUDIO
freq = freq / SAMPLE_RATE;
#endif
@ -125,6 +205,7 @@ void stop_note(double freq) {
volumes[j] = volumes[j+1];
volumes[j+1] = 0;
}
break;
}
}
voices--;
@ -144,6 +225,7 @@ void stop_note(double freq) {
volume = 0;
note = false;
}
sei();
}
}
@ -190,6 +272,16 @@ float mod(float a, int b)
return r < 0 ? r + b : r;
}
float vibrato(float average_freq) {
#ifdef VIBRATO_STRENGTH_ENABLE
float vibrated_freq = average_freq * pow(VIBRATO_LUT[(int)vibrato_counter], vibrato_strength);
#else
float vibrated_freq = average_freq * VIBRATO_LUT[(int)vibrato_counter];
#endif
vibrato_counter = mod((vibrato_counter + vibrato_rate * (1.0 + 440.0/average_freq)), VIBRATO_LUT_LENGTH);
return vibrated_freq;
}
ISR(TIMER3_COMPA_vect) {
if (note) {
#ifdef PWM_AUDIO
@ -241,34 +333,30 @@ ISR(TIMER3_COMPA_vect) {
}
#else
if (voices > 0) {
if (false && polyphony_rate > 0) {
if (polyphony_rate > 0) {
if (voices > 1) {
voice_place %= voices;
if (place++ > (frequencies[voice_place] / polyphony_rate / CPU_PRESCALER / voices)) {
if (place++ > (frequencies[voice_place] / polyphony_rate / CPU_PRESCALER)) {
voice_place = (voice_place + 1) % voices;
place = 0.0;
}
}
if (vibrato_strength > 0) {
freq = frequencies[voice_place] * pow(VIBRATO_LUT[(int)vibrato_counter], vibrato_strength);
vibrato_counter = mod((vibrato_counter + 1), VIBRATO_LUT_LENGTH);
freq = vibrato(frequencies[voice_place]);
} else {
freq = frequencies[voice_place];
}
} else {
if (frequency != 0) {
if (frequency < frequencies[voices - 1]) {
frequency = frequency * pow(2, 440/frequencies[voices - 1]/12/4);
} else if (frequency > frequencies[voices - 1]) {
frequency = frequency * pow(2, -440/frequencies[voices - 1]/12/4);
}
if (frequency != 0 && frequency < frequencies[voices - 1] && frequency < frequencies[voices - 1] * pow(2, -440/frequencies[voices - 1]/12/2)) {
frequency = frequency * pow(2, 440/frequency/12/2);
} else if (frequency != 0 && frequency > frequencies[voices - 1] && frequency > frequencies[voices - 1] * pow(2, 440/frequencies[voices - 1]/12/2)) {
frequency = frequency * pow(2, -440/frequency/12/2);
} else {
frequency = frequencies[voices - 1];
}
if (false && vibrato_strength > 0) {
freq = frequency * pow(VIBRATO_LUT[(int)vibrato_counter], vibrato_strength);
vibrato_counter = mod((vibrato_counter + 1 + 440/frequencies[voices - 1]), VIBRATO_LUT_LENGTH);
if (vibrato_strength > 0) {
freq = vibrato(frequency);
} else {
freq = frequency;
}
@ -302,9 +390,8 @@ ISR(TIMER3_COMPA_vect) {
if (note_frequency > 0) {
float freq;
if (false && vibrato_strength > 0) {
freq = note_frequency * pow(VIBRATO_LUT[(int)vibrato_counter], vibrato_strength);
vibrato_counter = mod((vibrato_counter + 1), VIBRATO_LUT_LENGTH);
if (vibrato_strength > 0) {
freq = vibrato(note_frequency);
} else {
freq = note_frequency;
}
@ -369,7 +456,7 @@ ISR(TIMER3_COMPA_vect) {
void play_notes(float (*np)[][2], uint8_t n_count, bool n_repeat, float n_rest) {
if (audio_config.enable) {
cli();
// Cancel note if a note is playing
if (note)
stop_all_notes();
@ -398,7 +485,7 @@ if (audio_config.enable) {
TIMSK3 |= _BV(OCIE3A);
TCCR3A |= _BV(COM3A1);
#endif
sei();
}
}
@ -425,7 +512,7 @@ if (audio_config.enable) {
void play_note(double freq, int vol) {
if (audio_config.enable && voices < 8) {
cli();
// Cancel notes if notes are playing
if (notes)
stop_all_notes();
@ -445,36 +532,9 @@ if (audio_config.enable && voices < 8) {
TIMSK3 |= _BV(OCIE3A);
TCCR3A |= _BV(COM3A1);
#endif
}
sei();
}
void set_timbre(float timbre)
{
note_timbre = timbre;
}
void set_tempo(float tempo)
{
note_tempo = tempo;
}
void decrease_tempo(uint8_t tempo_change)
{
note_tempo += (float) tempo_change;
}
void increase_tempo(uint8_t tempo_change)
{
if (note_tempo - (float) tempo_change < 10)
{
note_tempo = 10;
}
else
{
note_tempo -= (float) tempo_change;
}
}
//------------------------------------------------------------------------------

140
quantum/audio.h
Unescape Escape View File

@ -8,6 +8,9 @@
#ifndef AUDIO_H
#define AUDIO_H
// Enable vibrato strength/amplitude - slows down ISR too much
// #define VIBRATO_STRENGTH_ENABLE
typedef union {
uint8_t raw;
struct {
@ -20,6 +23,34 @@ void audio_toggle(void);
void audio_on(void);
void audio_off(void);
// Vibrato rate functions
void set_vibrato_rate(float rate);
void increase_vibrato_rate(float change);
void decrease_vibrato_rate(float change);
#ifdef VIBRATO_STRENGTH_ENABLE
void set_vibrato_strength(float strength);
void increase_vibrato_strength(float change);
void decrease_vibrato_strength(float change);
#endif
// Polyphony functions
void set_polyphony_rate(float rate);
void enable_polyphony();
void disable_polyphony();
void increase_polyphony_rate(float change);
void decrease_polyphony_rate(float change);
void set_timbre(float timbre);
void set_tempo(float tempo);
void increase_tempo(uint8_t tempo_change);
void decrease_tempo(uint8_t tempo_change);
void play_sample(uint8_t * s, uint16_t l, bool r);
void play_note(double freq, int vol);
void stop_note(double freq);
@ -27,11 +58,6 @@ void stop_all_notes(void);
void init_notes(void);
void play_notes(float (*np)[][2], uint8_t n_count, bool n_repeat, float n_rest);
void set_timbre(float timbre);
void set_tempo(float tempo);
void increase_tempo(uint8_t tempo_change);
void decrease_tempo(uint8_t tempo_change);
#define SCALE (int []){ 0 + (12*0), 2 + (12*0), 4 + (12*0), 5 + (12*0), 7 + (12*0), 9 + (12*0), 11 + (12*0), \
0 + (12*1), 2 + (12*1), 4 + (12*1), 5 + (12*1), 7 + (12*1), 9 + (12*1), 11 + (12*1), \
0 + (12*2), 2 + (12*2), 4 + (12*2), 5 + (12*2), 7 + (12*2), 9 + (12*2), 11 + (12*2), \
@ -47,108 +73,4 @@ void decrease_tempo(uint8_t tempo_change);
void play_goodbye_tone(void);
void play_startup_tone(void);
#define VIBRATO_LUT (float []) { \
1.00090714186239, \
1.00181152169061, \
1.00270955652027, \
1.00359767896099, \
1.00447235162891, \
1.00533008160601, \
1.00616743486158, \
1.00698105056935, \
1.00776765525194, \
1.00852407668313, \
1.0092472574777, \
1.00993426829815, \
1.01058232060837, \
1.01118877890462, \
1.01175117235612, \
1.01226720578933, \
1.01273476995269, \
1.01315195100182, \
1.0135170391489, \
1.01382853642434, \
1.01408516350345, \
1.01428586555648, \
1.0144298170856, \
1.0145164257189, \
1.01454533493752, \
1.0145164257189, \
1.0144298170856, \
1.01428586555648, \
1.01408516350345, \
1.01382853642434, \
1.0135170391489, \
1.01315195100182, \
1.01273476995269, \
1.01226720578933, \
1.01175117235612, \
1.01118877890462, \
1.01058232060837, \
1.00993426829815, \
1.0092472574777, \
1.00852407668313, \
1.00776765525194, \
1.00698105056935, \
1.00616743486158, \
1.00533008160601, \
1.00447235162891, \
1.00359767896099, \
1.00270955652027, \
1.00181152169061, \
1.00090714186239, \
1, \
0.999093680298157, \
0.998191753986265, \
0.997297765337276, \
0.996415217934032, \
0.995547561242821, \
0.99469817754036, \
0.993870369236874, \
0.993067346634376, \
0.992292216155724, \
0.991547969076588, \
0.990837470789065, \
0.990163450622494, \
0.989528492243954, \
0.988935024658062, \
0.988385313823004, \
0.98788145489731, \
0.987425365129624, \
0.987018777401739, \
0.986663234433381, \
0.986360083655655, \
0.986110472758728, \
0.985915345918143, \
0.985775440703176, \
0.985691285669809, \
0.985663198640188, \
0.985691285669809, \
0.985775440703176, \
0.985915345918143, \
0.986110472758728, \
0.986360083655655, \
0.986663234433381, \
0.987018777401739, \
0.987425365129624, \
0.98788145489731, \
0.988385313823004, \
0.988935024658062, \
0.989528492243954, \
0.990163450622494, \
0.990837470789065, \
0.991547969076588, \
0.992292216155724, \
0.993067346634376, \
0.993870369236874, \
0.99469817754036, \
0.99554756124282, \
0.996415217934032, \
0.997297765337276, \
0.998191753986265, \
0.999093680298157, \
1, \
}
#define VIBRATO_LUT_LENGTH NOTE_ARRAY_SIZE(VIBRATO_LUT)
#endif

108
quantum/vibrato_lut.h
Unescape Escape View File

@ -0,0 +1,108 @@
#include <avr/io.h>
#include <avr/interrupt.h>
#include <avr/pgmspace.h>
#define VIBRATO_LUT_LENGTH 100
const float VIBRATO_LUT[VIBRATO_LUT_LENGTH] = { \
1.00045346811453,
1.00090535101508,
1.00135386178926,
1.00179722447259,
1.00223368114872,
1.0026614990145,
1.00307897737994,
1.00348445457284,
1.00387631471807,
1.00425299436105,
1.00461298890553,
1.00495485883603,
1.00527723569589,
1.00557882779254,
1.00585842560279,
1.00611490685176,
1.00634724124066,
1.00655449479987,
1.00673583384565,
1.00689052852052,
1.00701795589922,
1.00711760264454,
1.0071890671992,
1.00723206150266,
1.0072464122237,
1.00723206150266,
1.0071890671992,
1.00711760264454,
1.00701795589922,
1.00689052852052,
1.00673583384565,
1.00655449479987,
1.00634724124066,
1.00611490685176,
1.00585842560279,
1.00557882779254,
1.00527723569589,
1.00495485883603,
1.00461298890553,
1.00425299436105,
1.00387631471807,
1.00348445457284,
1.00307897737994,
1.0026614990145,
1.00223368114872,
1.00179722447259,
1.00135386178926,
1.00090535101508,
1.00045346811453,
1,
0.999546737425598,
0.999095467903976,
0.998647968674285,
0.998205999748565,
0.99777129706302,
0.997345565759612,
0.996930473622346,
0.996527644691494,
0.996138653077835,
0.99576501699778,
0.995408193048995,
0.995069570744927,
0.994750467325326,
0.994452122858643,
0.994175695650927,
0.993922257974591,
0.99369279212925,
0.993488186845591,
0.993309234042139,
0.993156625943589,
0.993030952568311,
0.99293269959154,
0.992862246589715,
0.992819865670409,
0.992805720491269,
0.992819865670409,
0.992862246589715,
0.99293269959154,
0.993030952568311,
0.993156625943589,
0.993309234042139,
0.993488186845591,
0.99369279212925,
0.993922257974591,
0.994175695650927,
0.994452122858643,
0.994750467325326,
0.995069570744927,
0.995408193048995,
0.99576501699778,
0.996138653077835,
0.996527644691494,
0.996930473622346,
0.997345565759612,
0.99777129706302,
0.998205999748565,
0.998647968674285,
0.999095467903976,
0.999546737425598,
1
};
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