dc_blocker_cc_impl.h

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/* -*- c++ -*- */
/*
 * Copyright 2011,2012 Free Software Foundation, Inc.
 *
 * This file is part of GNU Radio
 *
 * GNU Radio 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, or (at your option)
 * any later version.
 *
 * GNU Radio 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 GNU Radio; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street,
 * Boston, MA 02110-1301, USA.
 */


#ifndef INCLUDED_FILTER_DC_BLOCKER_CC_IMPL_H
#define INCLUDED_FILTER_DC_BLOCKER_CC_IMPL_H

#include <filter/dc_blocker_cc.h>
#include <deque>

namespace gr {
  namespace filter {
    
    class moving_averager_c
    {
    public:
      moving_averager_c(int D);
      ~moving_averager_c();
      
      gr_complex filter(gr_complex x);
      gr_complex delayed_sig() { return d_out; }
      
    private:
      int d_length;
      gr_complex d_out, d_out_d1, d_out_d2;
      std::deque<gr_complex> d_delay_line;
    };
    
    class FILTER_API dc_blocker_cc_impl : public dc_blocker_cc
    {
    private:
      int d_length;
      bool d_long_form;
      moving_averager_c *d_ma_0;
      moving_averager_c *d_ma_1;
      moving_averager_c *d_ma_2;
      moving_averager_c *d_ma_3;
      std::deque<gr_complex> d_delay_line;

    public:
      dc_blocker_cc_impl(int D, bool long_form);

      ~dc_blocker_cc_impl();

      int group_delay();
      
      //int set_length(int D);
      
      int work(int noutput_items,
               gr_vector_const_void_star &input_items,
               gr_vector_void_star &output_items);
    };

  } /* namespace filter */
} /* namespace gr */

#endif /* INCLUDED_FILTER_DC_BLOCKER_CC_IMPL_H */