CLAM-Development  1.4.0
HumRemover.cxx
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1 /*
2  * Copyright (c) 2001-2004 MUSIC TECHNOLOGY GROUP (MTG)
3  * UNIVERSITAT POMPEU FABRA
4  *
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; either version 2 of the License, or
9  * (at your option) any later version.
10  *
11  * This program is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14  * GNU General Public License for more details.
15  *
16  * You should have received a copy of the GNU General Public License
17  * along with this program; if not, write to the Free Software
18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19  *
20  */
21 
22 #include "HumRemover.hxx"
23 #include "ProcessingFactory.hxx"
24 
25 namespace CLAM
26 {
27 
28 namespace Hidden
29 {
30  static const char * metadata[] = {
31  "key", "HumRemover",
32  // "category", "Spectral Transformations",
33  // "description", "HumRemover",
34  0
35  };
36  static FactoryRegistrator<ProcessingFactory, HumRemover> reg = metadata;
37 }
38 
39 bool HumRemover::Do(const Spectrum& in, Spectrum& out)
40 {
41  out = in; //we need to copy input to output no matter what
42 
43  DataArray& outMag = out.GetMagBuffer();
44 
45  int spectrumSize = in.GetSize();
46 
47  TData spectralResolution = spectrumSize/in.GetSpectralRange();
48  int humFundamental= Round(mAmount.GetLastValue()*spectralResolution);
49  int band = Round(mBandwidthCtl.GetLastValue()*spectralResolution);
50  int nHarmonics = Round(mHarmonicsCtl.GetLastValue());
51  int i, n;
52  int harmonic = 1;
53  for(i = 0; i<spectrumSize; i++)
54  {
55  if(i == humFundamental*harmonic)
56  {
57  int leftLimit = i-band;
58  if(leftLimit<0) leftLimit = 0;
59  int rightLimit = i+band+1;
60  if(rightLimit>spectrumSize) rightLimit=spectrumSize;
61  for (n=leftLimit; n<rightLimit;n++)
62  {
63  outMag[n] = 0;
64  }
65  harmonic++;
66  }
67  if (harmonic == nHarmonics) break;
68  }
69  return true;
70 }
71 
72 
73 
74 }
75