tomwalters@0: // Copyright 2006-2010, Thomas Walters
tomwalters@0: //
tomwalters@0: // AIM-C: A C++ implementation of the Auditory Image Model
tomwalters@0: // http://www.acousticscale.org/AIMC
tomwalters@0: //
tomwalters@0: // This program is free software: you can redistribute it and/or modify
tomwalters@0: // it under the terms of the GNU General Public License as published by
tomwalters@0: // the Free Software Foundation, either version 3 of the License, or
tomwalters@0: // (at your option) any later version.
tomwalters@0: //
tomwalters@0: // This program is distributed in the hope that it will be useful,
tomwalters@0: // but WITHOUT ANY WARRANTY; without even the implied warranty of
tomwalters@0: // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
tomwalters@0: // GNU General Public License for more details.
tomwalters@0: //
tomwalters@0: // You should have received a copy of the GNU General Public License
tomwalters@0: // along with this program.  If not, see <http://www.gnu.org/licenses/>.
tomwalters@0: 
tomwalters@0: /*! \file
tomwalters@0:  *  \brief
tomwalters@0:  */
tomwalters@0: 
tomwalters@0: /*! \author: Thomas Walters <tom@acousticscale.org>
tomwalters@0:  *  \date 2010/01/23
tomwalters@0:  *  \version \$Id: ERBTools.h 1 2010-02-02 11:04:50Z tcw $
tomwalters@0:  */
tomwalters@0: 
tomwalters@0: #ifndef _AIMC_SUPPORT_ERBTOOLS_H_
tomwalters@0: #define _AIMC_SUPPORT_ERBTOOLS_H_
tomwalters@0: 
tomwalters@0: #include <math.h>
tomwalters@0: 
tomwalters@0: namespace aimc {
tomwalters@0: class ERBTools {
tomwalters@0:  public:
tomwalters@0:   static float Freq2ERB(float freq) {
tomwalters@0:     return 21.4f * log10(4.37f * freq / 1000.0f + 1.0f);
tomwalters@0:   }
tomwalters@0: 
tomwalters@0:   static float Freq2ERBw(float freq) {
tomwalters@0:     return 24.7f * (4.37f * freq / 1000.0f + 1.0f);
tomwalters@0:   }
tomwalters@0: };
tomwalters@0: }
tomwalters@0: 
tomwalters@0: #endif  // _AIMC_SUPPORT_ERBTOOLS_H_