CLAM-Development  1.4.0
3BandGate.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 "3BandGate.hxx"
23 #include "ProcessingFactory.hxx"
24 
25 namespace CLAM
26 {
27 
28 namespace Hidden
29 {
30  static const char * metadata[] = {
31  "key", "ThreeBandGate",
32  // "category", "Spectral Transformations",
33  // "description", "ThreeBandGate",
34  0
35  };
36  static FactoryRegistrator<ProcessingFactory, ThreeBandGate> reg = metadata;
37 }
38 
39 
40 bool ThreeBandGate::Do(const Spectrum& in, Spectrum& out)
41 {
42  out = in; //even if out needs to be preserved, we need to copy content
43 
44  DataArray& oMag = out.GetMagBuffer();
45  DataArray& iMag = in.GetMagBuffer();
46 
47  int spectrumSize = in.GetSize();
48 
49  TData spectralResolution = spectrumSize/in.GetSpectralRange();
50 
51  int lowCutoff = Round(mLowCutoffFreqCtl.GetLastValue()* spectralResolution);
52  int highCutoff = Round(mHighCutoffFreqCtl.GetLastValue()* spectralResolution);
53 
54  //note: control is supposed to be sent as dB's
55  TData lowThreshold = log2lin(mLowThresholdCtl.GetLastValue());
56  TData midThreshold = log2lin(mMidThresholdCtl.GetLastValue());
57  TData highThreshold = log2lin(mHighThresholdCtl.GetLastValue());
58 
59  int i;
60  TData currentThreshold = lowThreshold;
61  for( i = 0; i<lowCutoff; i++)
62  {
63  if(iMag[i]<lowThreshold)
64  oMag[i] = 0;
65  }
66  for( i = lowCutoff; i<highCutoff; i++)
67  {
68  if(iMag[i]<midThreshold)
69  oMag[i] = 0;
70  }
71  for( i = highCutoff; i<spectrumSize; i++)
72  {
73  if(iMag[i]<highThreshold)
74  oMag[i] = 0;
75  }
76  return true;
77 }
78 
79 
80 
81 }
82