01.Basics/Vibrato/Vibrato.ino

This is an example using Oscil::phMod to produce vibrato using phase modulation.

/*  Example playing a sinewave with vibrato,
    using Mozzi sonification library.
  
    Demonstrates simple FM using phase modulation.
  
    Circuit: Audio output on digital pin 9 on a Uno or similar, or
    DAC/A14 on Teensy 3.1, or 
    check the README or http://sensorium.github.com/Mozzi/
  
    Mozzi help/discussion/announcements:
    https://groups.google.com/forum/#!forum/mozzi-users
  
    Tim Barrass 2012, CC by-nc-sa.
*/

//#include <ADC.h>  // Teensy 3.1 uncomment this line and install http://github.com/pedvide/ADC
#include <MozziGuts.h>
#include <Oscil.h>
#include <tables/cos2048_int8.h> // table for Oscils to play
#include <mozzi_midi.h> // for mtof
#include <mozzi_fixmath.h>

#define CONTROL_RATE 64 // powers of 2 please

Oscil<COS2048_NUM_CELLS, AUDIO_RATE> aCos(COS2048_DATA);
Oscil<COS2048_NUM_CELLS, AUDIO_RATE> aVibrato(COS2048_DATA);

const byte intensity = 255;

void setup(){
  startMozzi(CONTROL_RATE);
  aCos.setFreq(mtof(84.f));
  aVibrato.setFreq(15.f);
}


void updateControl(){
}


int updateAudio(){
    Q15n16 vibrato = (Q15n16) intensity * aVibrato.next();
    return aCos.phMod(vibrato); // phase modulation to modulate frequency
}

void loop(){
  audioHook();
}