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Name

FFT
Examples
import processing.sound.*;

FFT fft;
AudioIn in;
int bands = 512;
float[] spectrum = new float[bands];

void setup() {
  size(512, 360);
  background(255);
    
  // Create an Input stream which is routed into the Amplitude analyzer
  fft = new FFT(this, bands);
  in = new AudioIn(this, 0);
  
  // start the Audio Input
  in.start();
  
  // patch the AudioIn
  fft.input(in);
}      

void draw() { 
  background(255);
  fft.analyze(spectrum);

  for(int i = 0; i < bands; i++){
  // The result of the FFT is normalized
  // draw the line for frequency band i scaling it up by 5 to get more amplitude.
  line( i, height, i, height - spectrum[i]*height*5 );
  } 
}
Description This is a Fast Fourier Transform (FFT) analyzer. It calculates the normalized power spectrum of an audio stream the moment it is queried with the analyze() method.
Methods
input() Define the audio input for the analyzer.
analyze() Queries a value from the analyzer and returns a vector the size of the pre-defined number of bands.
Constructor
FFT(theParent, fftSize)
Updated on April 30, 2017 02:33:22pm EDT

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