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Index › Programming Questions & Help › Sound,  Music Libraries › putting my fft data inside an object
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putting my fft data inside an object (Read 1197 times)
sebastiano
putting my fft data inside an object
Aug 21st, 2009, 8:22am  
Hello , im using the ess library , i been trying to calculate my fft data inside an object , but my code doesnt work, im getting the message arrayindexoutofboundsexception... Is there any special way of using this function when i put my fft inside an object?
public void audioInputData(AudioInput theInput) {
 myFFT.getSpectrum(myInput);
}

?

or any idea of what am i doing wrong?


here is the code:


Code:


import processing.opengl.*;
import codeanticode.glgraphics.*;
import javax.media.opengl.GL;
import krister.Ess.*;


AudioInput myInput;

fourier object_fourrier;

void setup()
{
  size(384, 768); 
   Ess.start(this);
  myInput=new AudioInput(512);
  myInput.start();
  object_fourrier = new fourier();
}

void draw()
{
  
  background(250,0,0);
  object_fourrier.fft();
  print(object_fourrier.furier);

}
//public void audioInputData(AudioInput theInput) {
// fufi.getSpectrum(myInput);
//  }

public void audioInputData(AudioInput theInput) {
  object_fourrier.myFFT.getSpectrum(myInput);
}

class fourier{
  float furier;
  float[] fft;
  //**************<FFT>******************
  int bufferSize;
  int steps;
  float limitDiff;
  int numAverages=32;
  float myDamp=.1f;
  float maxLimit,minLimit;
  FFT myFFT;
  AudioInput myInput;
  //**************</FFT>******************
  
  
  
  fourier() {
    fft = new float[500]; 
    Ess.start(fft_clase.this);  
    // set up our AudioInput

    bufferSize=512;
    myInput=new AudioInput(bufferSize);
    // set up our FFT
    myFFT=new FFT(bufferSize*2);
    myFFT.equalizer(true);
    // set up our FFT normalization/dampening
    minLimit=0;
    maxLimit=1;
    myFFT.limits(minLimit,maxLimit);
    myFFT.damp(myDamp);
    myFFT.averages(500);
    myInput.start();
  }
  void fft() {
    audioInputData(myInput);
    for (int i = 400; i<500 ; i++){
	if (myFFT.spectrum[i]<0.1) furier = furier;   
	else furier += myFFT.spectrum[i];
    }
    furier = furier/100;
    fft[499] = furier;
    for (int j = 0; j < 499; j ++){
	fft[j] = fft[j+1]; 
    }
  }

  
}

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koogy
Re: putting my fft data inside an object
Reply #1 - Aug 21st, 2009, 1:41pm  
> im getting the message arrayindexoutofboundsexception...

> any idea of what am i doing wrong?

you're not telling us where you're getting the error - the exception should give you a line number which will help track it down. (if that's not happening use a try / catch and print the stack trace in the catch)

normally it'd just be a case of running the code ourselves but i don't have half the libraries you're using so...
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sebastiano
Re: putting my fft data inside an object
Reply #2 - Aug 21st, 2009, 9:47pm  
hi i get the error in this line:
object_fourrier.myFFT.getSpectrum(myInput);

you dont need the libraries to try the code, i forget to delete the libraries, please try this one:

ps. you need to save you sketch as fot.pde

bye

Code:


import krister.Ess.*;


AudioInput myInput;

fourier object_fourrier;

void setup()
{
  size(384, 768); 
   Ess.start(this);
  myInput=new AudioInput(512);
  myInput.start();
  object_fourrier = new fourier();
}

void draw()
{
  
  background(250,0,0);
  object_fourrier.fft();
  print(object_fourrier.furier);

}
//public void audioInputData(AudioInput theInput) {
// fufi.getSpectrum(myInput);
//  }

public void audioInputData(AudioInput theInput) {
  object_fourrier.myFFT.getSpectrum(myInput);
}

class fourier{
  float furier;
  float[] fft;
  //**************<FFT>******************
  int bufferSize;
  int steps;
  float limitDiff;
  int numAverages=32;
  float myDamp=.1f;
  float maxLimit,minLimit;
  FFT myFFT;
  AudioInput myInput;
  //**************</FFT>******************
  
  
  
  fourier() {
    fft = new float[500]; 
    Ess.start(fot.this);  
    // set up our AudioInput

    bufferSize=512;
    myInput=new AudioInput(bufferSize);
    // set up our FFT
    myFFT=new FFT(bufferSize*2);
    myFFT.equalizer(true);
    // set up our FFT normalization/dampening
    minLimit=0;
    maxLimit=1;
    myFFT.limits(minLimit,maxLimit);
    myFFT.damp(myDamp);
    myFFT.averages(500);
    myInput.start();
  }
  void fft() {
    audioInputData(myInput);
    for (int i = 400; i<500 ; i++){
	if (myFFT.spectrum[i]<0.1) furier = furier;   
	else furier += myFFT.spectrum[i];
    }
    furier = furier/100;
    fft[499] = furier;
    for (int j = 0; j < 499; j ++){
	fft[j] = fft[j+1]; 
    }
  }

  
}

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