instrument-a-day 17: teensy whisperer

whisperer2.ino

// whisperer2 for teensy 3.1/3.2 with teensy audio board

#include <Audio.h>
#include <Wire.h>
#include <SPI.h>
#include <SD.h>
#include <SerialFlash.h>

// GUItool: begin automatically generated code
AudioSynthWaveform       waveform1;      //xy=253,396
AudioSynthNoisePink      pink1;          //xy=262,460
AudioMixer4              mixer1;         //xy=423,426
AudioFilterBiquad filter1;        //xy=576,368
AudioFilterBiquad filter3;        //xy=576,497
AudioFilterBiquad filter2;        //xy=577,431
AudioMixer4              mixer2;         //xy=757,425
AudioOutputI2S           i2s1;           //xy=925,425
AudioConnection          patchCord1(waveform1, 0, mixer1, 0);
AudioConnection          patchCord2(pink1, 0, mixer1, 1);
AudioConnection          patchCord3(mixer1, 0, filter1, 0);
AudioConnection          patchCord4(mixer1, 0, filter2, 0);
AudioConnection          patchCord5(mixer1, 0, filter3, 0);
AudioConnection          patchCord6(filter1, 0, mixer2, 0);
AudioConnection          patchCord7(filter3, 0, mixer2, 2);
AudioConnection          patchCord8(filter2, 0, mixer2, 1);
AudioConnection          patchCord9(mixer2, 0, i2s1, 0);
AudioConnection          patchCord10(mixer2, 0, i2s1, 1);

AudioControlSGTL5000     sgtl5000_1;     //xy=253,200
// GUItool: end automatically generated code

AudioFilterBiquad *filters[] = {&filter1, &filter2, &filter3};

const int NUM_VOWELS = 10, NUM_FILTERS = 3;
const float vowels[NUM_VOWELS][NUM_FILTERS] = {
  {570,  840, 2410}, // /ow/ bought
  {300,  870, 2240}, // /oo/ boot
  {440, 1020, 2240}, // /u/  foot
  {730, 1090, 2440}, // /a/  hot
  {520, 1190, 2390}, // /uh/ but
  {490, 1350, 1690}, // /er/ bird
  {660, 1720, 2410}, // /ae/ bat
  {530, 1840, 2480}, // /e/  bet
  {390, 1990, 2550}, // /i/  bit
  {270, 2290, 3010}  // /iy/ beet
};


void setup() {
  AudioMemory(12);

  sgtl5000_1.enable();  // Enable the audio shield
  sgtl5000_1.volume(0.5);

  waveform1.begin(0.0, 210, WAVEFORM_SAWTOOTH);
  pink1.amplitude(0.0);

  //setVowel(2);

  usbMIDI.setHandleNoteOff(OnNoteOff);
  usbMIDI.setHandleNoteOn(OnNoteOn);
  usbMIDI.setHandleControlChange(OnControlChange);

  pinMode(LED_BUILTIN, OUTPUT);
}


float noteFreq = 200.0;
float noteDir = 0.0;


int thisVowel = 0;
void loop() {
  /* 
  setVowel(thisVowel);
  delay(500);
  thisVowel++;
  if (thisVowel >= NUM_VOWELS) thisVowel=0;
  */
  for (int i=0; i < 30; i++) {
    usbMIDI.read(); // USB MIDI receive
    delay(1);
  }

  noteFreq += noteDir;
  waveform1.frequency(noteFreq);
  
}

void setVowel(int vowelIndex) {
  for (int filterIndex=0; filterIndex<NUM_FILTERS; filterIndex++) {
    //filters[filterIndex]->resonance(7.0);
    //filters[filterIndex]->frequency(vowels[vowelIndex][filterIndex]);
    filters[filterIndex]->setBandpass(0, vowels[vowelIndex][filterIndex], 7.0);
  }
}

int currentNoteNum = 0;
float noiseAmount = 1.0;
float pitchedAmount = 0.0;

void OnNoteOn(byte channel, byte note, byte velocity) {
  int v = note % 12;
  v %= NUM_VOWELS;
  setVowel(v);
  currentNoteNum = note;
  pink1.amplitude(noiseAmount * velocity / 127.0);
  waveform1.amplitude(pitchedAmount * velocity / 127.0);

  noteFreq = random(250,500);
  noteDir = random(-100,100) / 50.0;
  waveform1.frequency(noteFreq);

  digitalWrite(LED_BUILTIN, 1);
}
void OnNoteOff(byte channel, byte note, byte velocity) {
  if (note==currentNoteNum) {
    pink1.amplitude(0);
    waveform1.amplitude(0);
    digitalWrite(LED_BUILTIN, 0);
  }
}

void OnControlChange(byte channel, byte control, byte value) {
  if (control==73) {
    noiseAmount = value / 127.0;
  }
  else if (control==72) {
    pitchedAmount = value / 127.0;
  }
}

blog post at http://moonmilk.com/2016/02/17/instrument-a-day-17-teensy-whispering-imp/