annotate src/Modules/SNR/ModuleNoise.h @ 611:0fbaf443ec82

Carfac C++ revision 3, indluding more style improvements. The output structs are now classes again, and have separate storage methods for each output structure along with flags in the Run and RunSegment methods to allow for only storing NAPs if desired.

// Copyright 2010, Thomas Walters
//
// AIM-C: A C++ implementation of the Auditory Image Model
// http://www.acousticscale.org/AIMC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

/*!
 * \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_;

  // True to generate pink noise, otherwise white noise
  bool pink_;

  // Filter state variables
  float s0_;
  float s1_;
  float s2_;

  float multiplier_;

  // Mersenne twister random number generator fed into a transform which 
  // yeilds Gaussian-distributed values
  boost::variate_generator<boost::mt19937,
                           boost::normal_distribution<float> >
                           gaussian_variate_;
};
}  // namespace aimc

#endif  // AIMC_MODULES_SNR_NOISE_H_