GNU Radio 3.5.1 C++ API
atsci_equalizer_lms2.h
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00001 /* -*- c++ -*- */
00002 /*
00003  * Copyright 2002 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 _ATSC_EQUALIZER_LMS2_H_
00024 #define _ATSC_EQUALIZER_LMS2_H_
00025 
00026 #include <atsc_api.h>
00027 #include <atsci_equalizer.h>
00028 #include <vector>
00029 #include <stdio.h>
00030 
00031 class ATSC_API atsci_equalizer_lms2 : public atsci_equalizer
00032 {
00033 public:
00034   atsci_equalizer_lms2 ();
00035   virtual ~atsci_equalizer_lms2 ();
00036 
00037   virtual void reset ();
00038   virtual int ntaps () const;
00039   virtual int npretaps () const;
00040   
00041 protected:
00042   FILE *trainingfile;
00043   virtual void filter_normal (const float *input_samples,
00044                               float *output_samples,
00045                               int   nsamples);
00046 
00047   virtual void filter_data_seg_sync (const float *input_samples,
00048                                      float *output_samples,
00049                                      int   nsamples,
00050                                      int   offset);
00051   
00052   virtual void filter_field_sync (const float *input_samples,
00053                                   float *output_samples,
00054                                   int   nsamples,
00055                                   int   offset,
00056                                   int   which_field);
00057 
00058 private:
00059   std::vector<double>   d_taps_ff;
00060   std::vector<double>   d_taps_fb;
00061   std::vector<float>    d_old_output;
00062 
00063   int d_output_ptr;
00064 
00065   void filterN (const float *input_samples,
00066                 float *output_samples,
00067                 int nsamples);
00068 
00069   void adaptN (const float *input_samples,
00070                const float *training_pattern,
00071                float *output_samples,
00072                int    nsamples);
00073 
00074   float filter1 (const float input[]);
00075   float adapt1 (const float input[], float ideal_output);
00076 
00077 };
00078 
00079 
00080 #endif /* _ATSC_EQUALIZER_LMS2_H_ */