h4yn0nnym0u5e
commented
1 year ago If you look at the code, the buffer used to generate the audio is 536 samples long, which by my calculation corresponds to about 82Hz. So if you request a frequency below E2, you will just get E2.
You could change it, but note it's a "magic number", rather than a defined constant. I counted 3 instances which need changing, but could have missed some...
shaitanbaali
Description
When generating notes with the AudioSynthKarplusStrong object the ones in the C1 octave are bad generated, with several frequencies the output is always the same.
Steps To Reproduce Problem
generate the code to play the following list of notes (C1 to B4) with one second of difference. then check the audio generated and the first 7 notes (C1 to B1) all them sound as E2 being C3 the first correct generated sound.
const int listaEscala[]{ // 1 c d e f g a b - 3 c d e f g a b - 4 c d e f g a b 24, 26, 28, 29, 31, 33, 35, 48, 50, 52, 53, 55, 57, 59, 60, 62, 64, 65, 67, 69, 71 };
Hardware & Software
Board: Teensy 4 Shields / modules used: AUdio SHield rev D Arduino IDE version: 1.8.19 Teensyduino version: 1.57 Operating system & version: OSX 12.6.3 Any other software or hardware? None.
Arduino Sketch
include
include
include
include
include
// GUItool: begin automatically generated code AudioSynthKarplusStrong string1; //xy=175,220 AudioAmplifier amp1; //xy=410,229 AudioOutputI2S i2s1; //xy=695,236 AudioConnection patchCord1(string1, amp1); AudioConnection patchCord2(amp1, 0, i2s1, 0); AudioConnection patchCord3(amp1, 0, i2s1, 1); AudioControlSGTL5000 sgtl5000_1; //xy=762,368 // GUItool: end automatically generated code float midiToFreq[128] = { //MTOF implementation 8.17579, //C-1 0 8.66195, 9.17702, 9.72271, 10.3008, 10.9133, 11.5623, 12.2498, 12.9782, 13.7500, 14.5676, 15.4338,
16.3515, //C0 12 17.3239, //C#0.Db0 18.3540, //D0 19.4454, //D#.Eb0 20.6017, //E0 21.8267, //F0 23.1246, //F#0.Gb0 24.4997, //G0 25.9565, //G#0.Ab0 27.5000, //A0 29.1352, //A#0.Bb0 30.8677, //B0
32.7031, //C1 24 34.6478, 36.7080, 38.8908, 41.2034, 43.6535, 46.2493, 48.9994, 51.9130, 55.0000, 58.2704, 61.7354,
65.4063, //C2 36 69.2956, 73.4161, 77.7817, 82.4068, 87.3070, 92.4986, 97.9988, 103.826, 110.000, 116.540, 123.470,
130.812, //C3 48 138.591, 146.832, 155.563, 164.813, 174.614, 184.997, 195.997, 207.652, 220.000, 233.081, 246.941,
261.625, //C4 60 277.182, 293.664, 311.126, 329.627, 349.228, 369.994, 391.995, 415.304, 440.000, 466.163, 493.883,
523.251, //C5 72 554.365, 587.329, 622.253, 659.255, 698.456, 739.988, 783.990, 830.609, 880.000, 932.327, 987.766,
1046.50, //C6 84 1108.73, 1174.65, 1244.50, 1318.51, 1396.91, 1479.97, 1567.98, 1661.21, 1760.00, 1864.65, 1975.53,
2093.00, //C7 96 2217.46, 2349.31, 2489.01, 2637.02, 2793.82, 2959.95, 3135.96, 3322.43, 3520.00, 3729.31, 3951.06,
4186.00, //C8 108 4434.92, 4698.63, 4978.03, 5274.04, 5587.65, 5919.91, 6271.92, 6644.87, 7040.00, 7458.62, 7902.13,
8372.01, //C9 120 8869.84, 9397.27, 9956.06, 10548.0, 11175.3, 11839.8, 12543.8 };
void setup() { AudioMemory(20); sgtl5000_1.enable(); sgtl5000_1.volume(0.6); amp1.gain(0.8); } int count = 0; unsigned long myTime = millis();
const int listaEscala[]{ // 3 c d e f g a b - 4 c d e f g a b 24, 26, 28, 29, 31, 33, 35, 48, 50, 52, 53, 55, 57, 59, 60, 62, 64, 65, 67, 69, 71 };
void loop() {
if (millis() - myTime >= 1000){ string1.noteOn(midiToFreq[listaEscala[count]], 1); Serial.println(listaEscala[count]); count = count + 1; if (count == 21) { count = 0; Serial.println("reset"); } myTime = millis(); }
}
Errors or Incorrect Output
NO compilation problems. Attached is a record of the loop in audio for testing.
STE-008.mp3.zip