File: AudioMask.H

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libaudiomask 1.0-3
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/*
 libaudiomask - hybrid simultaneous audio masking threshold evaluation library
    Copyright (C) 2000-2010  Dr Matthew Raphael Flax

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef AUDIOMASK_H_
#define AUDIOMASK_H_

#include "MooreSpread.H"

/**
* Evaluates the Dr M.R. Flax (2000) hybrid simultaneous audio mask
* Handles the evaluation of the simultaneous audio mask given a filter bank sub-banded output and sample count

*/
class AudioMask : private MooreSpread {
  double *excitation; //!< The excitation of the roex filters
  double *Lvmu;
  double factor;
protected:
  int fs; //!< Sample frequency
public:
  double *mask; //!< The audio mask
  double max; //!< The maximum value of the mask

  /**
  * Constructs the memory and factors for calculating the audio mask
  * @ sampFreq The sample frequency
  * @ fBankCount The number of filter sub-bands
  */
  AudioMask(int sampFreq, int fBankCount);
  ~AudioMask(void); //!< Deconstructor

  /**
  * Method for setting the centre freqs
  * @ which The sub-band
  * @ value The correcponding central frequency
  */
  void setCFreq(int which, double value){MooreSpread::setCFreq(which, value);}
  /**
  * Method for finding the Preceptual Audio Mask using the Terhardt model
  * @ filterBankOutput The output of the filter bank
  * @ sampleCount The number of samples
  */
  void exciteTerhardt(double **filterBankOutput, int sampleCount);
  void exciteBeerends(double **filterBankOutput, int sampleCount);  /// Method for finding the Preceptual Audio Mask using the Beerends model
};

#endif //AUDIOMASK_H_