tomwalters@0: // Copyright 2007-2010, University of Cambridge
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: /*!
tomwalters@0:  * \file
tomwalters@0:  * \brief Halfwave rectification, compression and lowpass filtering
tomwalters@0:  */
tomwalters@0: 
tomwalters@0: /* \author Tom Walters <tcw24@cam.ac.uk>
tomwalters@0:  * \date created 2007/03/07
tomwalters@0:  * \version \$Id: ModuleHCL.h 4 2010-02-03 18:44:58Z tcw $
tomwalters@0:  */
tomwalters@0: 
tomwalters@0: #ifndef _AIMC_MODULE_NAP_HCL_H_
tomwalters@0: #define _AIMC_MODULE_NAP_HCL_H_
tomwalters@0: 
tomwalters@0: #include <vector>
tomwalters@0: 
tomwalters@0: #include "Support/Module.h"
tomwalters@0: #include "Support/SignalBank.h"
tomwalters@0: 
tomwalters@0: namespace aimc {
tomwalters@0: using std::vector;
tomwalters@0: class ModuleHCL : public Module {
tomwalters@0:  public:
tomwalters@0:   ModuleHCL(Parameters *parameters);
tomwalters@0:   virtual ~ModuleHCL();
tomwalters@0: 
tomwalters@0:   virtual void Process(const SignalBank &input);
tomwalters@0: 
tomwalters@0:  private:
tomwalters@0:   /*! \brief Prepare the module
tomwalters@0:    *  \param input Input signal bank
tomwalters@0:    *  \param output true on success false on failure
tomwalters@0:    */
tomwalters@0:   virtual bool InitializeInternal(const SignalBank &input);
tomwalters@0: 
tomwalters@3:   virtual void ResetInternal();
tomwalters@3: 
tomwalters@0:   //! \brief Do lowpass filtering?
tomwalters@0:   bool do_lowpass_;
tomwalters@0: 
tomwalters@0:   //! \brief Do log compression?
tomwalters@0:   bool do_log_;
tomwalters@0: 
tomwalters@0:   //! \brief Cutoff frequency for lowpass filter
tomwalters@0:   float lowpass_cutoff_;
tomwalters@0: 
tomwalters@0:   //! \brief Order of Lowpass Filter
tomwalters@0:   int lowpass_order_;
tomwalters@0: 
tomwalters@0:   //! \brief Internal record of the number of channels in the input
tomwalters@0:   int channel_count_;
tomwalters@0: 
tomwalters@0:   //! \brief Time constant corresponsing to the lowpass filter cutoff freqency
tomwalters@0:   float time_constant_;
tomwalters@0: 
tomwalters@0:   //! \brief Lowpass filter state variables
tomwalters@0:   float xn_;
tomwalters@0:   float yn_;
tomwalters@0:   vector<vector<float> > yns_;
tomwalters@0: };
tomwalters@0: }  // namespace aimc
tomwalters@0: 
tomwalters@0: #endif  // _AIMC_MODULE_NAP_HCL_H_