3BandGate.cxx

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00001 /*
00002  * Copyright (c) 2001-2004 MUSIC TECHNOLOGY GROUP (MTG)
00003  *                         UNIVERSITAT POMPEU FABRA
00004  *
00005  *
00006  * This program is free software; you can redistribute it and/or modify
00007  * it under the terms of the GNU General Public License as published by
00008  * the Free Software Foundation; either version 2 of the License, or
00009  * (at your option) any later version.
00010  *
00011  * This program is distributed in the hope that it will be useful,
00012  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00013  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00014  * GNU General Public License for more details.
00015  *
00016  * You should have received a copy of the GNU General Public License
00017  * along with this program; if not, write to the Free Software
00018  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
00019  *
00020  */
00021 
00022 #include "3BandGate.hxx"
00023 #include "ProcessingFactory.hxx"
00024 
00025 namespace CLAM
00026 {
00027 
00028 namespace Hidden
00029 {
00030         static const char * metadata[] = {
00031                 "key", "ThreeBandGate",
00032         //      "category", "Spectral Transformations",
00033         //      "description", "ThreeBandGate",
00034                 0
00035         };
00036         static FactoryRegistrator<ProcessingFactory, ThreeBandGate> reg = metadata;
00037 }
00038 
00039 
00040 bool ThreeBandGate::Do(const Spectrum& in, Spectrum& out)
00041 {
00042         out = in; //even if out needs to be preserved, we need to copy content
00043         
00044         DataArray& oMag = out.GetMagBuffer();
00045         DataArray& iMag = in.GetMagBuffer();
00046         
00047         int spectrumSize = in.GetSize();
00048         
00049         TData spectralResolution = spectrumSize/in.GetSpectralRange();
00050         
00051         int lowCutoff = Round(mLowCutoffFreqCtl.GetLastValue()* spectralResolution);
00052         int highCutoff =        Round(mHighCutoffFreqCtl.GetLastValue()* spectralResolution);
00053 
00054         //note: control is supposed to be sent as dB's
00055         TData lowThreshold =    log2lin(mLowThresholdCtl.GetLastValue());
00056         TData midThreshold =    log2lin(mMidThresholdCtl.GetLastValue());
00057         TData highThreshold =   log2lin(mHighThresholdCtl.GetLastValue());
00058         
00059         int i;
00060         TData currentThreshold = lowThreshold;
00061         for( i = 0; i<lowCutoff; i++)
00062         {
00063                 if(iMag[i]<lowThreshold)
00064                         oMag[i] = 0;
00065         }
00066         for( i = lowCutoff; i<highCutoff; i++)
00067         {
00068                 if(iMag[i]<midThreshold)
00069                         oMag[i] = 0;
00070         }
00071         for( i = highCutoff; i<spectrumSize; i++)
00072         {
00073                 if(iMag[i]<highThreshold)
00074                         oMag[i] = 0;
00075         }
00076         return true;
00077 }
00078 
00079 
00080 
00081 }
00082 
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