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   1 /* -*- c++ -*- */
   2 /*
   3  * Copyright 2010 Free Software Foundation, Inc.
   4  *
   5  * This file is part of GNU Radio
   6  *
   7  * GNU Radio is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 3, or (at your option)
  10  * any later version.
  11  *
  12  * GNU Radio is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with GNU Radio; see the file COPYING.  If not, write to
  19  * the Free Software Foundation, Inc., 51 Franklin Street,
  20  * Boston, MA 02110-1301, USA.
  21  */
  22
  23
  24 #ifndef INCLUDED_GR_PFB_SYNTHESIS_FILTERBANK_CCF_H
  25 #define INCLUDED_GR_PFB_SYNTHESIS_FILTERBANK_CCF_H
  26
  27 #include <gr_sync_interpolator.h>
  28
  29 class gr_pfb_synthesis_filterbank_ccf;
  30 typedef boost::shared_ptr<gr_pfb_synthesis_filterbank_ccf> gr_pfb_synthesis_filterbank_ccf_sptr;
  31 gr_pfb_synthesis_filterbank_ccf_sptr gr_make_pfb_synthesis_filterbank_ccf
  32     (unsigned int numchans, const std::vector<float> &taps);
  33
  34 class gr_fir_ccf;
  35 class gri_fft_complex;
  36
  37
  38 /*!
  39  * \class gr_pfb_synthesis_filterbank_ccf
  40  *
  41  * \brief Polyphase synthesis filterbank with
  42  *        gr_complex input, gr_complex output and float taps
  43  *
  44  * \ingroup filter_blk
  45  */
  46
  47 class gr_pfb_synthesis_filterbank_ccf : public gr_sync_interpolator
  48 {
  49  private:
  50   /*!
  51    * Build the polyphase synthesis filterbank.
  52    * \param numchans (unsigned integer) Specifies the number of channels <EM>M</EM>
  53    * \param taps    (vector/list of floats) The prototype filter to populate the filterbank.
  54    */
  55   friend gr_pfb_synthesis_filterbank_ccf_sptr gr_make_pfb_synthesis_filterbank_ccf
  56       (unsigned int numchans, const std::vector<float> &taps);
  57
  58   bool                     d_updated;
  59   unsigned int             d_numchans;
  60   std::vector<gr_fir_ccf*> d_filters;
  61   std::vector< std::vector<float> > d_taps;
  62   unsigned int             d_taps_per_filter;
  63   gri_fft_complex         *d_fft;
  64   gr_complex             **d_buffer;
  65
  66   /*!
  67    * Build the polyphase synthesis filterbank.
  68    * \param numchans (unsigned integer) Specifies the number of channels <EM>M</EM>
  69    * \param taps    (vector/list of floats) The prototype filter to populate the filterbank.
  70    */
  71   gr_pfb_synthesis_filterbank_ccf (unsigned int numchans,
  72                                    const std::vector<float> &taps);
  73
  74 public:
  75   ~gr_pfb_synthesis_filterbank_ccf ();
  76
  77   /*!
  78    * Resets the filterbank's filter taps with the new prototype filter
  79    * \param taps    (vector/list of floats) The prototype filter to populate the filterbank.
  80    */
  81   void set_taps (const std::vector<float> &taps);
  82
  83   /*!
  84    * Print all of the filterbank taps to screen.
  85    */
  86   void print_taps();
  87
  88   int work (int noutput_items,
  89             gr_vector_const_void_star &input_items,
  90             gr_vector_void_star &output_items);
  91 };
  92
  93 #endif