comparison src/Modules/NAP/ModuleHCL.h @ 0:582cbe817f2c

- Initial add of support code and modules. Not everything is working yet.

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