text: /**
   * The MIT License (MIT)
   *
   * based on public source code by alex@smartelectronix.com, adapted
   * by Igor Zinken - http://www.igorski.nl
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy of
   * this software and associated documentation files (the "Software"), to deal in
   * the Software without restriction, including without limitation the rights to
   * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
   * the Software, and to permit persons to whom the Software is furnished to do so,
   * subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in all
   * copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
   * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
   * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
   * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
   * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
   */
  #ifndef __FORMANTFILTER_H_INCLUDED__
  #define __FORMANTFILTER_H_INCLUDED__
  
  #include "baseprocessor.h"
  
  class FormantFilter : public BaseProcessor
  {
      public:
          FormantFilter( double aVowel );
          ~FormantFilter();
  
          void setVowel( double aVowel );
          double getVowel();
  
          void process( AudioBuffer* audioBuffer, bool isMonoSource );
          bool isCacheable();
  
          static const int VOWEL_A = 0;
          static const int VOWEL_E = 1;
          static const int VOWEL_I = 2;
          static const int VOWEL_O = 3;
          static const int VOWEL_U = 4;
  
      private:
          double  _vowel;
          double _currentCoeffs[ 11 ];
          double _coeffs[ 5 ][ 11 ];
          double _memory[ 10 ];
          void calculateCoeffs();
  };
  
  #endif
  