compare Image

lviensen

I need to compare these two frequencies and generate a similarity score .

dsbailey

I think it would be easier to compare frequencies using the audio file instead. Do you have access to that?

lviensen

Yes

dsbailey

Ok then you should check out this fft example:

https://www.processing.org/reference/libraries/sound/FFT.html

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 );
  } 
}

You should be able to generate some kind of similarity score by comparing the 2 spectra. I don't think that it is time sensitive... i.e. the same sound forwards and backwards will have the same fft (I'm just guessing on that though. my math is a little rusty. could someone confirm or falsify?)

for a more complicated but more complete discussion of similarity check out this thread: http://www.dsprelated.com/showthread/comp.dsp/103820-1.php