| Mozzi version v1.1.0 sound synthesis library for Arduino |

07.Envelopes/Ead_Envelope/Ead_Envelope.ino

This is an example of how to use the Ead class.

/* Example playing an enveloped noise source
using Mozzi sonification library.
Demonstrates Ead (exponential attack decay).
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.io/Mozzi/
Mozzi help/discussion/announcements:
https://groups.google.com/forum/#!forum/mozzi-users
Tim Barrass 2012, CC by-nc-sa
*/
#include <MozziGuts.h>
#include <Oscil.h> // oscillator template
#include <tables/brownnoise8192_int8.h> // recorded audio wavetable
#include <Ead.h> // exponential attack decay
#include <EventDelay.h>
#include <mozzi_rand.h>
#define CONTROL_RATE 256 // Hz, powers of 2 are most reliable
Oscil<BROWNNOISE8192_NUM_CELLS, AUDIO_RATE> aNoise(BROWNNOISE8192_DATA);
EventDelay kDelay; // for triggering envelope start
Ead kEnvelope(CONTROL_RATE); // resolution will be CONTROL_RATE
int gain;
void setup(){
// use float to set freq because it will be small and fractional
aNoise.setFreq((float)AUDIO_RATE/BROWNNOISE8192_SAMPLERATE);
randSeed(); // fresh random, MUST be called before startMozzi - wierd bug
startMozzi(CONTROL_RATE);
kDelay.start(1000);
}
void updateControl(){
// jump around in audio noise table to disrupt obvious looping
aNoise.setPhase(rand((unsigned int)BROWNNOISE8192_NUM_CELLS));
if(kDelay.ready()){
// set random parameters
unsigned int duration = rand(500u)+200;
unsigned int attack = rand(75)+5; // +5 so the internal step size is more likely to be >0
unsigned int decay = duration - attack;
kEnvelope.start(attack,decay);
kDelay.start(duration+500);
}
gain = (int) kEnvelope.next();
}
AudioOutput_t updateAudio(){
return MonoOutput::from16Bit(gain*aNoise.next());
}
void loop(){
audioHook(); // required here
}