plectrum

Plectrum: instrument tuner for Android
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AutoCorrelation.java (1563B)

      1 /*
      2 *      _______                       _____   _____ _____  
      3 *     |__   __|                     |  __ \ / ____|  __ \ 
      4 *        | | __ _ _ __ ___  ___  ___| |  | | (___ | |__) |
      5 *        | |/ _` | '__/ __|/ _ \/ __| |  | |\___ \|  ___/ 
      6 *        | | (_| | |  \__ \ (_) \__ \ |__| |____) | |     
      7 *        |_|\__,_|_|  |___/\___/|___/_____/|_____/|_|     
      8 *                                                         
      9 * -------------------------------------------------------------
     10 *
     11 * TarsosDSP is developed by Joren Six at IPEM, University Ghent
     12 *  
     13 * -------------------------------------------------------------
     14 *
     15 *  Info: http://0110.be/tag/TarsosDSP
     16 *  Github: https://github.com/JorenSix/TarsosDSP
     17 *  Releases: http://0110.be/releases/TarsosDSP/
     18 *  
     19 *  TarsosDSP includes modified source code by various authors,
     20 *  for credits and info, see README.
     21 * 
     22 */
     23 
     24 package be.tarsos.dsp;
     25 
     26 public class AutoCorrelation implements AudioProcessor {
     27 
     28     private float result;
     29     
     30     public AutoCorrelation(){
     31     }
     32     
     33     @Override
     34     public boolean process(AudioEvent audioEvent) {
     35         float[] audioFloatbuffer = audioEvent.getFloatBuffer();
     36         
     37         result = 0;
     38 
     39         for (int i=0; i<audioFloatbuffer.length; i++){
     40         	result += ((float)Math.abs(audioFloatbuffer[i]))/(float)audioFloatbuffer.length;
     41         }
     42         return true;
     43     }
     44     
     45     @Override
     46     public void processingFinished() {
     47     }
     48 
     49     public float[] getValues() {
     50     	float[] returnValue = new float[1];
     51     	returnValue[0] = result;
     52         return returnValue;
     53     }
     54 }