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 "SpectralNotch.hxx" 00023 #include "ProcessingFactory.hxx" 00024 00025 namespace CLAM 00026 { 00027 00028 namespace Hidden 00029 { 00030 static const char * metadata[] = { 00031 "key", "SpectralNotch", 00032 // "category", "Spectral Transformations", 00033 // "description", "SpectralNotch", 00034 0 00035 }; 00036 static FactoryRegistrator<ProcessingFactory, SpectralNotch> reg = metadata; 00037 } 00038 00039 bool SpectralNotch::Do(const Spectrum& in, Spectrum& out) 00040 { 00041 out = in; //we need to copy input to output no matter what 00042 00043 DataArray& outMag = out.GetMagBuffer(); 00044 00045 int spectrumSize = in.GetSize(); 00046 00047 TData spectralResolution = spectrumSize/in.GetSpectralRange(); 00048 int centerFreq = Round(mFreq.GetLastValue()*spectralResolution); 00049 int band = Round(mBandwidthCtl.GetLastValue()*spectralResolution); 00050 TData gain = log2lin(mGainCtl.GetLastValue()); 00051 int n; 00052 int harmonic = 1; 00053 int leftLimit = centerFreq-band; 00054 if(leftLimit<0) leftLimit = 0; 00055 int rightLimit = centerFreq+band+1; 00056 if(rightLimit>spectrumSize) rightLimit=spectrumSize; 00057 for (n=leftLimit; n<rightLimit;n++) 00058 { 00059 outMag[n] *= gain ; 00060 } 00061 //implement small rolloff to avoid Gibbs effect 00062 outMag[leftLimit-1] *= (gain*0.5); 00063 outMag[rightLimit] *= (gain*0.5); 00064 return true; 00065 } 00066 00067 00068 } 00069