GNU Radio 3.5.1 C++ API
gr_fractional_interpolator_ff.h
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00001 /* -*- c++ -*- */
00002 /*
00003  * Copyright 2004,2007 Free Software Foundation, Inc.
00004  *
00005  * This file is part of GNU Radio
00006  *
00007  * GNU Radio is free software; you can redistribute it and/or modify
00008  * it under the terms of the GNU General Public License as published by
00009  * the Free Software Foundation; either version 3, or (at your option)
00010  * any later version.
00011  *
00012  * GNU Radio is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00015  * GNU General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU General Public License
00018  * along with GNU Radio; see the file COPYING.  If not, write to
00019  * the Free Software Foundation, Inc., 51 Franklin Street,
00020  * Boston, MA 02110-1301, USA.
00021  */
00022 
00023 #ifndef INCLUDED_GR_FRACTIONAL_INTERPOLATOR_FF_H
00024 #define INCLUDED_GR_FRACTIONAL_INTERPOLATOR_FF_H
00025 
00026 #include <gr_core_api.h>
00027 #include <gr_block.h>
00028 
00029 class gri_mmse_fir_interpolator;
00030 
00031 class gr_fractional_interpolator_ff;
00032 typedef boost::shared_ptr<gr_fractional_interpolator_ff> gr_fractional_interpolator_ff_sptr;
00033 
00034 // public constructor
00035 GR_CORE_API gr_fractional_interpolator_ff_sptr gr_make_fractional_interpolator_ff (float phase_shift, float interp_ratio);
00036 
00037 /*!
00038  * \brief Interpolating mmse filter with float input, float output
00039  * \ingroup filter_blk
00040  */
00041 class GR_CORE_API gr_fractional_interpolator_ff : public gr_block
00042 {
00043 public:
00044   ~gr_fractional_interpolator_ff ();
00045   void forecast(int noutput_items, gr_vector_int &ninput_items_required);
00046   int general_work (int noutput_items,
00047                     gr_vector_int &ninput_items,
00048                     gr_vector_const_void_star &input_items,
00049                     gr_vector_void_star &output_items);
00050 
00051   float mu() const { return d_mu;}
00052   float interp_ratio() const { return d_mu_inc;}
00053   void set_mu (float mu) { d_mu = mu; }
00054   void set_interp_ratio (float interp_ratio) { d_mu_inc = interp_ratio; }
00055 
00056 protected:
00057   gr_fractional_interpolator_ff (float phase_shift, float interp_ratio);
00058 
00059 private:
00060   float                         d_mu;
00061   float                         d_mu_inc;
00062   gri_mmse_fir_interpolator     *d_interp;
00063 
00064   friend GR_CORE_API gr_fractional_interpolator_ff_sptr
00065   gr_make_fractional_interpolator_ff (float phase_shift, float interp_ratio);
00066 };
00067 
00068 #endif