GNU Radio 3.5.1 C++ API
gr_adaptive_fir_ccc.h
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00001 /* -*- c++ -*- */
00002 /*
00003  * Copyright 2011 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_ADAPTIVE_FIR_CCC_H
00024 #define INCLUDED_GR_ADAPTIVE_FIR_CCC_H
00025 
00026 #include <gr_core_api.h>
00027 #include <gr_sync_decimator.h>
00028 
00029 /*!
00030  * \brief Adaptive FIR filter with gr_complex input, gr_complex output and float taps
00031  * \ingroup filter_blk
00032  */
00033 class GR_CORE_API gr_adaptive_fir_ccc : public gr_sync_decimator
00034 {
00035 private:
00036   std::vector<gr_complex>  d_new_taps;
00037   bool                     d_updated;
00038 
00039 protected:
00040   gr_complex               d_error;
00041   std::vector<gr_complex>  d_taps;
00042 
00043   // Override to calculate error signal per output
00044   virtual gr_complex error(const gr_complex &out) = 0; 
00045 
00046   // Override to calculate new weight from old, corresponding input
00047   virtual void update_tap(gr_complex &tap, const gr_complex &in) = 0;
00048 
00049   gr_complex filter(gr_complex *x);
00050 
00051   gr_adaptive_fir_ccc(const char *name, int decimation,
00052                       const std::vector<gr_complex> &taps);
00053 
00054 public:
00055   void set_taps(const std::vector<gr_complex> &taps);
00056 
00057   int work(int noutput_items,
00058            gr_vector_const_void_star &input_items,
00059            gr_vector_void_star &output_items);
00060 };
00061 
00062 #endif