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AvgChunkPower.java

00001 /*
00002  *  Copyright 2006-2007 Columbia University.
00003  *
00004  *  This file is part of MEAPsoft.
00005  *
00006  *  MEAPsoft is free software; you can redistribute it and/or modify
00007  *  it under the terms of the GNU General Public License version 2 as
00008  *  published by the Free Software Foundation.
00009  *
00010  *  MEAPsoft is distributed in the hope that it will be useful, but
00011  *  WITHOUT ANY WARRANTY; without even the implied warranty of
00012  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013  *  General Public License for more details.
00014  *
00015  *  You should have received a copy of the GNU General Public License
00016  *  along with MEAPsoft; if not, write to the Free Software
00017  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
00018  *  02110-1301 USA
00019  *
00020  *  See the file "COPYING" for the text of the license.
00021  */
00022 
00023 package com.meapsoft.featextractors;
00024 
00025 import com.meapsoft.STFT;
00026 
00034 public class AvgChunkPower extends FeatureExtractor 
00035 {       
00036     public double[] features(STFT stft, long startFrame, int length) 
00037     {
00038         double[] power = new double[1];
00039         power[0] = 0;
00040         double[] samples = stft.getSamples(startFrame, startFrame+length);
00041         
00042         for(int i=0; i<samples.length; i++) 
00043             power[0] += samples[i]*samples[i]/samples.length;
00044         
00045         return power;
00046     }
00047 
00048         public String description()
00049         {
00050                 return "Computes the average power in each chunk.";
00051         }
00052 }

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