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- /* 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 "e2_note.h"
- #include "a2_note.h"
- #include "d3_note.h"
- #include "g3_note.h"
- #include "b3_note.h"
- #include "e4_note.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()) {
- wav_note.play(e2_note);
- //wav_note.play(a2_note);
- //wav_note.play(d3_note);
- //wav_note.play(g3_note);
- //wav_note.play(b3_note);
- //wav_note.play(e4_note);
- 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);
- 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);
- }
- }
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