Changed frequencies and added noise
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Rodrigo Franco
parent
565d718049
commit
44643fe4ad
222
jerdehl.c
222
jerdehl.c
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@ -5,19 +5,17 @@
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#include <time.h>
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#define SINE_TABLE_SIZE 2048
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#define ZERO_FIVE 0.5
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#define ZERO_THREE 0.3
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#define UINT32_MAX_HALF (UINT32_MAX / 2)
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#define CHORD_NOTES 3
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#define CHORD_TYPES 21
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#define CHORD_TYPES 7
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float sinetab[SINE_TABLE_SIZE];
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double sinetab[SINE_TABLE_SIZE];
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typedef struct oscillator
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{
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uint32_t phasor;
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uint32_t step;
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float value;
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double value;
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} osc_t;
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typedef struct
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@ -26,54 +24,70 @@ typedef struct
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int noteDuration;
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} PianoOscillator;
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// Frequencies for chords in the key of C (C, Dm, Em, F, G, Am)
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typedef struct noise_oscillator
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{
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uint32_t seed;
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double value;
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} noise_osc_t;
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double generate_noise(noise_osc_t *n)
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{
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// A simple pseudo-random noise generator
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n->seed = (n->seed * 1103515245 + 12345) & 0x7fffffff;
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return (double)n->seed / 0x40000000 - 1.0; // Normalize to range -1.0 to 1.0
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}
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void init_noise_osc(noise_osc_t *n, uint32_t seed)
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{
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n->seed = seed;
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}
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double update_crackle(noise_osc_t *n)
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{
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// Generate the base noise
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double noise = generate_noise(n);
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// Apply random volume modulation to simulate the crackling effect
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double volume = 0 + ((double)rand() / RAND_MAX) * 0.5; // Random volume between 0.2 and 1.0
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// Occasionally spike the volume to simulate louder crackles
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if ((rand() % 100) < 40) // 10% chance for a louder crackle
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{
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volume += 0.5; // Increase volume for a louder crackle
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}
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// Clamp the volume to avoid clipping
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volume = (volume > 1.0) ? 1.0 : volume;
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// Apply the volume to the noise
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noise *= volume;
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// Clamp the noise to avoid clipping
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return noise;
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}
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float chordFrequencies[CHORD_TYPES][CHORD_NOTES] = {
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{65.41, 77.78, 98.00}, // Cm (C, Eb, G)
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{87.31, 98.00, 116.54}, // Fm7 (F, G, Bb)
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{73.42, 87.31, 110.00}, // Ddim (D, F, A)
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{61.74, 77.78, 92.50}, // G7 (G, B, F)
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{58.27, 73.42, 87.31}, // BbMaj (Bb, D, F)
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{65.41, 82.41, 103.83}, // Cm/Ab (Ab, C, Eb)
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{73.42, 92.50, 116.54}, // D7 (D, F#, A, C)
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{65.41, 77.78, 98.00}, // Cm (C, Eb, G) repeat
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{58.27, 73.42, 87.31}, // BbMaj (Bb, D, F) repeat
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{61.74, 77.78, 92.50}, // G7 (G, B, F) repeat
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{77.78, 98.00, 123.47}, // EbMaj (Eb, G, Bb)
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{82.41, 103.83, 130.81}, // AbMaj (Ab, C, Eb)
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{87.31, 110.00, 130.81}, // FMaj7 (F, A, C, E)
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{98.00, 123.47, 146.83}, // GMaj (G, B, D)
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{103.83, 130.81, 155.56}, // AbMaj7 (Ab, C, Eb, G)
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{110.00, 130.81, 164.81}, // AMaj7 (A, C#, E, G#)
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{116.54, 146.83, 174.61}, // BbMaj (Bb, D, F)
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{123.47, 155.56, 185.00}, // EbMaj7 (Eb, G, Bb, D)
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{130.81, 164.81, 195.00}, // FMaj (F, A, C)
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{146.83, 174.61, 220.00}, // GMaj7 (G, B, D, F#)
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{65.41, 77.78, 98.00} // Cm (C, Eb, G)
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{65.41, 77.78, 98.00}, // Cm (C, Eb, G)
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{73.42, 87.31, 97.99}, // Ddim (D, F, Ab)
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{82.41, 97.99, 123.47}, // Eb (Eb, G, Bb)
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{87.31, 103.83, 130.81},// Fm (F, Ab, C)
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{97.99, 116.54, 146.83},// Gm (G, Bb, D)
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{103.83, 123.47, 155.56},// Ab (Ab, C, Eb)
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{116.54, 130.81, 155.56},// Bb (Bb, D, F)
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};
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float higherChordFrequencies[CHORD_TYPES][CHORD_NOTES] = {
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{130.81, 155.56, 196.00}, // Cm (C4, Eb4, G4)
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{146.83, 174.61, 195.99}, // Ddim (D4, F4, Ab4)
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{164.81, 195.99, 246.94}, // Eb (Eb4, G4, Bb4)
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{174.61, 207.65, 261.63}, // Fm (F4, Ab4, C5)
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{195.99, 233.08, 293.66}, // Gm (G4, Bb4, D5)
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{207.65, 246.94, 311.13}, // Ab (Ab4, C5, Eb5)
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{233.08, 261.63, 311.13}, // Bb (Bb4, D5, F5)
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};
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float higherChordFrequencies[CHORD_TYPES][CHORD_NOTES] = {
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{130.82 * 2, 155.56 * 2, 196.00 * 2}, // Cm (C6, Eb6, G6)
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{174.62 * 2, 196.00 * 2, 233.08 * 2}, // Fm7 (F6, G6, Bb6)
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{146.84 * 2, 174.62 * 2, 220.00 * 2}, // Ddim (D6, F6, A6)
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{123.48 * 2, 155.56 * 2, 185.00 * 2}, // G7 (G6, B6, F6)
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{116.54 * 2, 146.84 * 2, 174.62 * 2}, // BbMaj (Bb6, D6, F6)
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{130.82 * 2, 164.82 * 2, 207.66 * 2}, // Cm/Ab (Ab6, C6, Eb6)
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{146.84 * 2, 185.00 * 2, 233.08 * 2}, // D7 (D6, F#6, A6, C6)
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{130.82 * 2, 155.56 * 2, 196.00 * 2}, // Cm (C6, Eb6, G6) repeat
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{116.54 * 2, 146.84 * 2, 174.62 * 2}, // BbMaj (Bb6, D6, F6) repeat
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{123.48 * 2, 155.56 * 2, 185.00 * 2}, // G7 (G6, B6, F6) repeat
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{155.56 * 2, 196.00 * 2, 246.94 * 2}, // EbMaj (Eb6, G6, Bb6)
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{164.82 * 2, 207.66 * 2, 261.62 * 2}, // AbMaj (Ab6, C6, Eb6)
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{174.62 * 2, 220.00 * 2, 261.62 * 2}, // FMaj7 (F6, A6, C6, E6)
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{196.00 * 2, 246.94 * 2, 293.66 * 2}, // GMaj (G6, B6, D6)
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{207.66 * 2, 261.62 * 2, 311.12 * 2}, // AbMaj7 (Ab6, C6, Eb6, G6)
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{220.00 * 2, 261.62 * 2, 329.62 * 2}, // AMaj7 (A6, C#6, E6, G#6)
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{233.08 * 2, 293.66 * 2, 349.22 * 2}, // BbMaj (Bb6, D6, F6)
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{246.94 * 2, 311.12 * 2, 369.99 * 2}, // EbMaj7 (Eb6, G6, Bb6, D6)
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{261.62 * 2, 329.62 * 2, 391.99 * 2}, // FMaj (F6, A6, C6)
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{293.66 * 2, 349.22 * 2, 440.00 * 2}, // GMaj7 (G6, B6, D6, F#6)
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{130.82 * 2, 155.56 * 2, 196.00 * 2} // Cm (C6, Eb6, G6)
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};
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void set_osc_freq(osc_t *o, float f)
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{
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o->step = (uint32_t)((f / 16000.0) * UINT32_MAX);
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o->phasor = 0; // Reset the phasor to start at the beginning of the sine wave
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}
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void update_osc(osc_t *o)
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{
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@ -83,79 +97,37 @@ void update_osc(osc_t *o)
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o->value = sinetab[index];
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}
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void set_osc_freq(osc_t *o, float f)
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{
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o->step = (uint32_t)((f / 16000.0) * UINT32_MAX);
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o->phasor = 0; // Reset the phasor to start at the beginning of the sine wave
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}
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void update_piano_osc(PianoOscillator *p)
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{
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if (p->noteDuration > 0)
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{
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void update_piano_osc(PianoOscillator *p, float chordFrequencies[CHORD_TYPES][CHORD_NOTES], int notePlayChance) {
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if (p->noteDuration > 0) {
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// Continue playing the current chord
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p->noteDuration--; // Decrement the note duration
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}
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else
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{
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// Time to play a new chord
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int chordIndex = rand() % CHORD_TYPES;
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for (int i = 0; i < CHORD_NOTES; ++i)
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{
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// Assign a new frequency to each oscillator in the chord
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set_osc_freq(&p->noteOsc[i], chordFrequencies[chordIndex][i]);
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double fadeOutFactor = 1.0;
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int twoThirdsDuration = (2 * p->noteDuration / 3);
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if (p->noteDuration <= twoThirdsDuration) {
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// Calculate fade-out factor
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fadeOutFactor = (double)p->noteDuration / twoThirdsDuration;
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}
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// Update the value for each oscillator in the chord with fade-out
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for (int i = 0; i < CHORD_NOTES; ++i) {
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update_osc(&p->noteOsc[i]);
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p->noteOsc[i].value *= fadeOutFactor; // Apply fade-out factor
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}
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p->noteDuration = (rand() % 5 + 1) * 16000; // Set a new random note duration
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}
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// Update the value for each oscillator in the chord
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for (int i = 0; i < CHORD_NOTES; ++i)
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{
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update_osc(&p->noteOsc[i]);
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}
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}
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void update_high_piano_osc(PianoOscillator *p)
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{
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if (p->noteDuration > 0)
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{
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// Continue playing the current chord or silence
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p->noteDuration--; // Decrement the note duration
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}
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else
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{
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} else {
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// Random chance to play a new chord or not play anything (silence)
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if (rand() % 10 == 0)
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{ // 50% chance to start a new chord, adjust as needed
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if (rand() % notePlayChance == 0) {
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int chordIndex = rand() % CHORD_TYPES;
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for (int i = 0; i < CHORD_NOTES; ++i)
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{
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// Assign a new frequency to each oscillator in the chord
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set_osc_freq(&p->noteOsc[i], higherChordFrequencies[chordIndex][i]);
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for (int i = 0; i < CHORD_NOTES; ++i) {
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set_osc_freq(&p->noteOsc[i], chordFrequencies[chordIndex][i]);
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}
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}
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else
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{
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p->noteDuration = (rand() % 10 + 1) * 16000; // Set a new random note duration
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} else {
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// Set all oscillator values to zero to represent silence
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for (int i = 0; i < CHORD_NOTES; ++i)
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{
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for (int i = 0; i < CHORD_NOTES; ++i) {
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p->noteOsc[i].value = 0.0f;
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}
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}
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// Set a new random note duration
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p->noteDuration = (rand() % 5 + 1) * 16000; // E.g., between 1 and 5 seconds
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}
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// Update the value for each oscillator in the chord
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if (p->noteDuration > 0)
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{ // Only update oscillators if not in silence
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for (int i = 0; i < CHORD_NOTES; ++i)
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{
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update_osc(&p->noteOsc[i]);
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}
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}
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}
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int main()
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{
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FILE *fp;
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@ -181,38 +153,48 @@ int main()
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// Initialize the first chord and duration for piano and high piano
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int chordIndex = rand() % CHORD_TYPES;
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pianoOsc.noteDuration = (rand() % 100 + 1) * 16000; // Start with a random duration
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highPianoOsc.noteDuration = (rand() % 5 + 1) * 16000; // Start with a random duration
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update_piano_osc(&pianoOsc, chordFrequencies, 10); // Start with a random duration
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update_piano_osc(&highPianoOsc, higherChordFrequencies, 8); // Start with a random duration
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// Set the frequencies for the first chord
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for (int i = 0; i < CHORD_NOTES; ++i)
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{
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set_osc_freq(&pianoOsc.noteOsc[i], chordFrequencies[chordIndex][i]);
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set_osc_freq(&highPianoOsc.noteOsc[i], higherChordFrequencies[chordIndex][i]);
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}
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noise_osc_t fireCrackleOsc;
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init_noise_osc(&fireCrackleOsc, time(NULL));
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while (1)
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{
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out = 0.0f; // Reset output each iteration
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// Update the piano and high piano oscillators
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update_piano_osc(&pianoOsc);
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update_high_piano_osc(&highPianoOsc);
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// Update the piano oscillator
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update_piano_osc(&pianoOsc, chordFrequencies, 10); // 10 for a 1 in 10 chance of silence
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// Update the high piano oscillator
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update_piano_osc(&highPianoOsc, higherChordFrequencies, 2); // 2 for a 1 in 2 chance of silence
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// Mix the outputs from all oscillators
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for (int i = 0; i < CHORD_NOTES; ++i)
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{
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out += pianoOsc.noteOsc[i].value + highPianoOsc.noteOsc[i].value;
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out += pianoOsc.noteOsc[i].value + (highPianoOsc.noteOsc[i].value * -1.0f);
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}
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out /= CHORD_NOTES; // Correctly average the mixed notes
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out /= (2 * CHORD_NOTES); // Correctly average the mixed notes, considering both piano and high piano
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// Fire crackling noise
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double crackle = update_crackle(&fireCrackleOsc);
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out += crackle * 0.1f;
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// Increase the gain to make the signal louder
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float gain = 0.2f; // Adjust the gain factor as needed
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float gain = 0.5f; // Adjust the gain factor as needed
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out *= gain;
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// Ensure the signal does not exceed the maximum range
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if (out > 1.0f)
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out = 1.0f;
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if (out < -1.0f)
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out = 0.8f;
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out = -1.0f;
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// Scale to 16-bit output value
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out16 = (uint16_t)((UINT16_MAX / 2) * (0.5 + 0.5 * out));
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@ -221,6 +203,6 @@ int main()
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fwrite(&out16, sizeof(out16), 1, fp);
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fwrite(&out16, sizeof(out16), 1, fp);
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}
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fclose(fp);
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return 0;
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}
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