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1 // Copyright 2007-2010, University of Cambridge
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2 //
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3 // AIM-C: A C++ implementation of the Auditory Image Model
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4 // http://www.acousticscale.org/AIMC
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5 //
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6 // This program is free software: you can redistribute it and/or modify
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7 // it under the terms of the GNU General Public License as published by
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8 // the Free Software Foundation, either version 3 of the License, or
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9 // (at your option) any later version.
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10 //
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11 // This program is distributed in the hope that it will be useful,
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12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 // GNU General Public License for more details.
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15 //
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16 // You should have received a copy of the GNU General Public License
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17 // along with this program. If not, see <http://www.gnu.org/licenses/>.
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18
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19 /*!
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20 * \file
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21 * \brief Halfwave rectification, compression and lowpass filtering
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22 */
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23
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24 /* \author Tom Walters <tcw24@cam.ac.uk>
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25 * \date created 2007/03/07
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26 * \version \$Id: ModuleHCL.h 4 2010-02-03 18:44:58Z tcw $
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27 */
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28
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29 #ifndef _AIMC_MODULE_NAP_HCL_H_
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30 #define _AIMC_MODULE_NAP_HCL_H_
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31
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32 #include <vector>
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33
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34 #include "Support/Module.h"
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35 #include "Support/SignalBank.h"
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36
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37 namespace aimc {
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38 using std::vector;
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39 class ModuleHCL : public Module {
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40 public:
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41 ModuleHCL(Parameters *parameters);
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42 virtual ~ModuleHCL();
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43
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44 virtual void Process(const SignalBank &input);
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45 virtual void Reset();
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46
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47 private:
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48 /*! \brief Prepare the module
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49 * \param input Input signal bank
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50 * \param output true on success false on failure
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51 */
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52 virtual bool InitializeInternal(const SignalBank &input);
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53
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54 //! \brief Do lowpass filtering?
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55 bool do_lowpass_;
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56
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57 //! \brief Do log compression?
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58 bool do_log_;
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59
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60 //! \brief Cutoff frequency for lowpass filter
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61 float lowpass_cutoff_;
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62
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63 //! \brief Order of Lowpass Filter
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64 int lowpass_order_;
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65
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66 //! \brief Internal record of the number of channels in the input
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67 int channel_count_;
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68
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69 //! \brief Time constant corresponsing to the lowpass filter cutoff freqency
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70 float time_constant_;
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71
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72 //! \brief Lowpass filter state variables
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73 float xn_;
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74 float yn_;
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75 vector<vector<float> > yns_;
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76 };
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77 } // namespace aimc
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78
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79 #endif // _AIMC_MODULE_NAP_HCL_H_
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