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   1 /* -*- c++ -*- */
   2 /*
   3  * Copyright 2009 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_CLOCK_SYNC_CCF_H
  25 #define INCLUDED_GR_PFB_CLOCK_SYNC_CCF_H
  26
  27 #include <gr_block.h>
  28
  29 class gr_pfb_clock_sync_ccf;
  30 typedef boost::shared_ptr<gr_pfb_clock_sync_ccf> gr_pfb_clock_sync_ccf_sptr;
  31 gr_pfb_clock_sync_ccf_sptr gr_make_pfb_clock_sync_ccf (float sps, float gain,
  32                                                        const std::vector<float> &taps,
  33                                                        unsigned int filter_size=32,
  34                                                        float init_phase=0);
  35
  36 class gr_fir_ccf;
  37
  38 /*!
  39  * \class gr_pfb_clock_sync_ccf
  40  *
  41  * \brief Timing synchronizer using polyphase filterbanks
  42  *
  43  * \ingroup filter_blk
  44  *
  45  */
  46
  47 class gr_pfb_clock_sync_ccf : public gr_block
  48 {
  49  private:
  50   /*!
  51    * Build the polyphase filterbank timing synchronizer.
  52    */
  53   friend gr_pfb_clock_sync_ccf_sptr gr_make_pfb_clock_sync_ccf (float sps, float gain,
  54                                                                 const std::vector<float> &taps,
  55                                                                 unsigned int filter_size,
  56                                                                 float init_phase);
  57
  58   bool                     d_updated;
  59   unsigned int             d_sps;
  60   float                    d_alpha;
  61   float                    d_beta;
  62   unsigned int             d_nfilters;
  63   std::vector<gr_fir_ccf*> d_filters;
  64   std::vector<gr_fir_ccf*> d_diff_filters;
  65   std::vector< std::vector<float> > d_taps;
  66   std::vector< std::vector<float> > d_dtaps;
  67   float                    d_k;
  68   float                    d_rate;
  69   unsigned int             d_start_count;
  70   unsigned int             d_taps_per_filter;
  71
  72   /*!
  73    * Build the polyphase filterbank timing synchronizer.
  74    */
  75   gr_pfb_clock_sync_ccf (float sps, float gain,
  76                          const std::vector<float> &taps,
  77                          unsigned int filter_size,
  78                          float init_phase);
  79
  80   void create_diff_taps(const std::vector<float> &newtaps,
  81                         std::vector<float> &difftaps);
  82
  83 public:
  84   ~gr_pfb_clock_sync_ccf ();
  85
  86   /*!
  87    * Resets the filterbank's filter taps with the new prototype filter
  88    */
  89   void set_taps (const std::vector<float> &taps,
  90                  std::vector< std::vector<float> > &ourtaps,
  91                  std::vector<gr_fir_ccf*> &ourfilter);
  92   std::vector<float> channel_taps(int channel);
  93   std::vector<float> diff_channel_taps(int channel);
  94
  95   /*!
  96    * Print all of the filterbank taps to screen.
  97    */
  98   void print_taps();
  99   void print_diff_taps();
 100
 101   void set_gain(float gain)
 102   {
 103     d_alpha = gain;
 104     d_beta = 0.25*d_alpha*d_alpha;
 105   }
 106
 107   int general_work (int noutput_items,
 108                     gr_vector_int &ninput_items,
 109                     gr_vector_const_void_star &input_items,
 110                     gr_vector_void_star &output_items);
 111 };
 112
 113 #endif