Add GuitarTuneNotes example

examples/Analysis/GuitarTuneNotes/GuitarTuneNotes.ino

@@ -0,0 +1,76 @@
+/*
+ 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"
+//---------------------------------------------------------------------------------------
+AudioAnalyzeGuitarTuner   tuner;
+AudioOutputAnalog         dac;
+AudioPlayMemory           wav_note;
+AudioMixer4               mixer;
+//---------------------------------------------------------------------------------------
+AudioConnection patchCord0(wav_note, 0, mixer, 0);
+AudioConnection patchCord1(mixer, 0, tuner, 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.
+     */
+    tuner.initialize(.15);
+    pinMode(LED_BUILTIN, OUTPUT);
+    playNoteTimer.begin(playNote, 1000);
+}
+
+void loop() {
+    // read back fundamental frequency
+    if (tuner.available()) {
+        float note = tuner.read();
+        float prob = tuner.probability();
+        Serial.printf("Note: %3.2f | Probability: %.2f\n", note, prob);
+    }
+}

examples/Analysis/GuitarTuneNotes/a2_note.h

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+#include "Arduino.h"
+extern const unsigned int a2_note[53971];

examples/Analysis/GuitarTuneNotes/b3_note.h

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+#include "Arduino.h"
+extern const unsigned int b3_note[53990];

examples/Analysis/GuitarTuneNotes/d3_note.h

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+#include "Arduino.h"
+extern const unsigned int d3_note[53974];

examples/Analysis/GuitarTuneNotes/e2_note.h

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+#include "Arduino.h"
+extern const unsigned int e2_note[53990];

examples/Analysis/GuitarTuneNotes/e4_note.h

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+#include "Arduino.h"
+extern const unsigned int e4_note[53990];

examples/Analysis/GuitarTuneNotes/g3_note.h

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+#include "Arduino.h"
+extern const unsigned int g3_note[53965];