Marsyas
0.6.0-alpha
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00001 /* 00002 ** Copyright (C) 1998-2006 George Tzanetakis <gtzan@cs.uvic.ca> 00003 ** 00004 ** This program is free software; you can redistribute it and/or modify 00005 ** it under the terms of the GNU General Public License as published by 00006 ** the Free Software Foundation; either version 2 of the License, or 00007 ** (at your option) any later version. 00008 ** 00009 ** This program is distributed in the hope that it will be useful, 00010 ** but WITHOUT ANY WARRANTY; without even the implied warranty of 00011 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00012 ** GNU General Public License for more details. 00013 ** 00014 ** You should have received a copy of the GNU General Public License 00015 ** along with this program; if not, write to the Free Software 00016 ** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 00017 */ 00018 00019 #ifndef MARSYAS_ERBTOOLS_H 00020 #define MARSYAS_ERBTOOLS_H 00021 00022 namespace Marsyas 00023 { 00024 00025 // 00026 // From ERBTools.h in AIMC 00027 // 00028 class ERBTools { 00029 public: 00030 static double Freq2ERB(double freq) { 00031 return 21.4 * log10(4.37 * freq / 1000.0 + 1.0); 00032 } 00033 00034 static double Freq2ERBw(double freq) { 00035 return 24.7 * (4.37 * freq / 1000.0 + 1.0); 00036 } 00037 00038 static double ERB2Freq(double erb) { 00039 return (pow(10, (erb / 21.4)) - 1.0) / 4.37 * 1000.0; 00040 } 00041 }; 00042 } 00043 #endif