view src/Modules/SNR/ModuleNoise.h @ 32:9122efd2b227

-New AIMCopy main for the SSI features (temporary hack till I get a working module load system)
-LocalMax strobe criterion. This is faster and better than the parabola version, which still seems buggy.
-Noise generator module. Adds noise to a signal. Uses boost for the random number generator.
-New options for the SSI
-Slice now respects all its flags (oops!).
-MATLAB functions for visualisation
-Scripts for generating data to view in MATLAB
-Script to download and build HTK - useful for running experiments

// Copyright 2010, Thomas Walters
//
// AIM-C: A C++ implementation of the Auditory Image Model
// http://www.acousticscale.org/AIMC
//
// 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/>.

/*!
 * \author Thomas Walters <[e-mail]>
 * \date created 2010/02/24
 * \version \$Id$
 */

#ifndef AIMC_MODULES_SNR_NOISE_H_
#define AIMC_MODULES_SNR_NOISE_H_

#include <boost/random.hpp>

#include "Support/Module.h"

namespace aimc {
class ModuleNoise : public Module {
 public:
  explicit ModuleNoise(Parameters *pParam);
  virtual ~ModuleNoise();

  /*! \brief Process a buffer
   */
  virtual void Process(const SignalBank &input);

 private:
  /*! \brief Reset the internal state of the module
   */
  virtual void ResetInternal();

  /*! \brief Prepare the module
   *  \param input Input signal
   *  \param output true on success false on failure
   */
  virtual bool InitializeInternal(const SignalBank &input);

  float sample_rate_;
  int buffer_length_;
  int channel_count_;

  float multiplier_;

  // Random number generator which yeilds Gaussian-distributed values by
  // The generator is a Mersenne twister
  boost::variate_generator<boost::mt19937,
                           boost::normal_distribution<float> >
                           gaussian_variate_;
};
}  // namespace aimc

#endif  // AIMC_MODULES_SNR_NOISE_H_