/* Detect the frequency of music notes, by Colin Duffy
This example repeatedly plays a guitar note (output to the DAC pin)
and prints an analysis of the frequency to the Arduino Serial Monitor
https://forum.pjrc.com/threads/32252-Different-Range-FFT-Algorithm/page2
https://github.com/duff2013/AudioTuner
*/
/*
C C# D Eb E F F# G G# A Bb B
0 16.35 17.32 18.35 19.45 20.60 21.83 23.12 24.50 25.96 27.50 29.14 30.87
1 32.70 34.65 36.71 38.89 41.20 43.65 46.25 49.00 51.91 55.00 58.27 61.74
2 65.41 69.30 73.42 77.78 82.41 87.31 92.50 98.00 103.8 110.0 116.5 123.5
3 130.8 138.6 146.8 155.6 164.8 174.6 185.0 196.0 207.7 220.0 233.1 246.9
4 261.6 277.2 293.7 311.1 329.6 349.2 370.0 392.0 415.3 440.0 466.2 493.9
5 523.3 554.4 587.3 622.3 659.3 698.5 740.0 784.0 830.6 880.0 932.3 987.8
6 1047 1109 1175 1245 1319 1397 1480 1568 1661 1760 1865 1976
7 2093 2217 2349 2489 2637 2794 2960 3136 3322 3520 3729 3951
8 4186 4435 4699 4978 5274 5588 5920 6272 6645 7040 7459 7902
Guitar strings are E2=82.41Hz, A2=110Hz, D3=146.8Hz, G3=196Hz, B3=246.9Hz, E4=329.6Hz
Bass strings are (5th string) B0=30.87Hz, (4th string) E1=41.20Hz, A1=55Hz, D2=73.42Hz, G2=98Hz
This example tests the yin algorithm with actual notes from nylon string guitar recorded
as wav format at 16B @ 44100 samples/sec. Since the decay of the notes will be longer than what
the teensy can store in flash these notes are truncated to ~120,000B or about 1/2 of the whole
signal.
*/
#include <SerialFlash.h>
#include <Audio.h>
#include <Wire.h>
#include <SPI.h>
#include <SD.h>
//---------------------------------------------------------------------------------------
#include "guitar_e2_note.h"
#include "guitar_a2_note.h"
#include "guitar_d3_note.h"
#include "guitar_g3_note.h"
#include "guitar_b3_note.h"
#include "guitar_e4_note.h"
#include "tuba_1.h"
#include "tuba_2.h"
#include "tuba_3.h"
#include "tuba_4.h"
#include "tuba_5.h"
//---------------------------------------------------------------------------------------
AudioAnalyzeNoteFrequency notefreq;
AudioOutputAnalog dac;
AudioPlayMemory wav_note;
AudioMixer4 mixer;
//---------------------------------------------------------------------------------------
AudioConnection patchCord0(wav_note, 0, mixer, 0);
AudioConnection patchCord1(mixer, 0, notefreq, 0);
AudioConnection patchCord2(mixer, 0, dac, 0);
//---------------------------------------------------------------------------------------
IntervalTimer playNoteTimer;
void playNote(void) {
if (!wav_note.isPlaying()) {
// Uncomment one of these sounds to test notefreq
wav_note.play(guitar_e2_note);
//wav_note.play(guitar_a2_note);
//wav_note.play(guitar_d3_note);
//wav_note.play(guitar_g3_note);
//wav_note.play(guitar_b3_note);
//wav_note.play(guitar_e4_note);
//wav_note.play(tuba_1);
//wav_note.play(tuba_2);
//wav_note.play(tuba_3);
//wav_note.play(tuba_4);
//wav_note.play(tuba_5);
digitalWriteFast(LED_BUILTIN, !digitalReadFast(LED_BUILTIN));
}
}
//---------------------------------------------------------------------------------------
void setup() {
AudioMemory(30);
/*
* Initialize the yin algorithm's absolute
* threshold, this is good number.
*/
notefreq.begin(.15);
pinMode(LED_BUILTIN, OUTPUT);
// Audio library isr allways gets priority
playNoteTimer.priority(144);
playNoteTimer.begin(playNote, 1000);
}
void loop() {
// read back fundamental frequency
if (notefreq.available()) {
float note = notefreq.read();
float prob = notefreq.probability();
Serial.printf("Note: %3.2f | Probability: %.2f\n", note, prob);
}
}