CLAM-Development
1.1
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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 "SpectralExciter.hxx" 00023 #include "ProcessingFactory.hxx" 00024 00025 namespace CLAM 00026 { 00027 namespace Hidden 00028 { 00029 static const char * metadata[] = { 00030 "key", "SpectralExciter", 00031 // "category", "Spectral Transformations", 00032 // "description", "SpectralExciter", 00033 0 00034 }; 00035 static FactoryRegistrator<ProcessingFactory, SpectralExciter> reg = metadata; 00036 } 00037 00038 00039 bool SpectralExciter::Do(const Spectrum& in, Spectrum& out) 00040 { 00041 out = in; //we are better off copying it no matter whether out has to be preserved or not. 00042 00043 00044 int spectrumSize = in.GetSize(); 00045 TData spectralResolution = spectrumSize/in.GetSpectralRange(); 00046 00047 int highCutoff = Round(mHighCutoffFreqCtl.GetLastValue()* spectralResolution); 00048 00049 TData threshold = log2lin(mThresholdCtl.GetLastValue()); 00050 TData gain = log2lin(mHarmonicsGainCtl.GetLastValue()); 00051 00052 DataArray& outMag = out.GetMagBuffer(); 00053 00054 int i,n; 00055 00056 //note: we might want to do something to the phase 00057 for(i = spectrumSize; i>highCutoff; i--) 00058 { 00059 if(outMag[i]>threshold) 00060 { 00061 for (n=i*2; n<spectrumSize; n+=i) { 00062 outMag[n] += outMag[i]*gain; 00063 if (outMag[n]>1.) { 00064 outMag[n]=1.; 00065 } 00066 } 00067 } 00068 } 00069 return true; 00070 } 00071 00072 00073 } 00074