Project #16: Sound – White Noise – Mk16

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#donluc #sound #whitenoise #mozzi #arduino #sparkfun #project #programming #electronics #microcontrollers #consultant #zoom #patreon #videoblog

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White Noise

Thus, random signals are considered “white noise” if they are observed to have a flat spectrum over the range of frequencies that are relevant to the context. For an audio signal, the relevant range is the band of audible sound frequencies (between 20 and 20,000 Hz). Such a signal is heard by the human ear as a hissing sound. In music and acoustics, the term “white noise” may be used for any signal that has a similar hissing sound. It is sometimes used analogously in nontechnical contexts to mean “random talk without meaningful contents”.

DL2104Mk01

1 x Arduino Pro Mini 328 – 5V/16MHz
1 x Audio Jack 3.5mm
1 x SparkFun Audio Jack Breakout
1 x Hamburger Mini Speaker
4 x Jumper Wires 3in M/M
1 x Full-Size Breadboard
1 x SparkFun Cerberus USB Cable
1 x SparkFun FTDI Basic Breakout – 5V

Arduino Pro Mini 328 – 5V/16MHz

SPK – Digital 9
VIN – +5V
GND – GND

DL2104Mk01p.ino

// ***** Don Luc Electronics © *****
// Software Version Information
// Project #16: Sound - White Noise - Mk16
// 04-01
// DL2104Mk01p.ino 16-16
// 1 x Arduino Pro Mini 328 - 5V/16MHz
// 1 x Audio Jack 3.5mm
// 1 x SparkFun Audio Jack Breakout
// 1 x Hamburger Mini Speaker
// 4 x Jumper Wires 3in M/M
// 1 x Full-Size Breadboard
// 1 x SparkFun Cerberus USB Cable
// 1 x SparkFun FTDI Basic Breakout - 5V

// Include the Library Code
// Mozzi
#include <MozziGuts.h>
#include <mozzi_rand.h>
// Oscillator template
#include <Oscil.h>
// Sine table for oscillator whitenoise
#include <tables/whitenoise8192_int8.h>

// Oscil <table_size, update_rate> oscilName (wavetable), look in .h file of table #included above
Oscil <WHITENOISE8192_NUM_CELLS, AUDIO_RATE> aSin(WHITENOISE8192_DATA);

// Mini Speaker
int SPK = 9;

// Set the input for the volume
// To convey the volume level from updateControl() to updateAudio()
byte volume;

// Software Version Information
String sver = "16-16";

void loop() {

  // Audio Hook
  audioHook();
  
}

getMozzi.ino

// Mozzi
// Update Control
int updateAudio()
{
  
  // White Noise
  char whitenoise = rand((byte)255) - 128;
  return ((whitenoise * aSin.next()) * volume)>>8;
  
}
// Update Audio 
void updateControl(){
  
  // Map it to an 8 bit range for efficient calculations in updateAudio
  // Volume
  volume = 255;

}

setup.ino

// Setup
void setup() {

  // Mozzi Start
  startMozzi();
  // Set the frequency
  aSin.setFreq(0.05f);
  
}

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