atsci_equalizer.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_H_
00024 #define _ATSC_EQUALIZER_H_
00025 
00026 #include <atsci_syminfo.h>
00027 
00031 class atsci_equalizer {
00032 
00033 private:
00034 
00035   /*
00036    * have we seen a field sync since the last reset or problem?
00037    */
00038   bool  d_locked_p;
00039 
00040   /*
00041    * sample offset from the beginning of the last field sync we saw
00042    * to the beginning of our current input stream.  When we're locked
00043    * this will be in [0, 313*832] i.e., [0, 260416]
00044    */
00045   int   d_offset_from_last_field_sync;
00046 
00047   int   d_current_field;                // [0,1]
00048 
00049 
00050 public:
00051 
00052   // CREATORS
00053   atsci_equalizer ();
00054   virtual ~atsci_equalizer ();
00055   
00056   // MANIPULATORS
00057 
00063   virtual void reset ();
00064   
00080   virtual void filter (const float         *input_samples,
00081                        const atsc::syminfo *input_tags,
00082                        float               *output_samples,
00083                        int                  nsamples);
00084 
00085   // ACCESSORS
00086 
00093   virtual int ntaps () const = 0;
00094 
00108   virtual int npretaps () const = 0;
00109   
00110 
00111 protected:
00112 
00123   virtual void filter_normal (const float *input_samples,
00124                               float *output_samples,
00125                               int   nsamples) = 0;
00126 
00137   virtual void filter_data_seg_sync (const float *input_samples,
00138                                      float *output_samples,
00139                                      int   nsamples,
00140                                      int   offset) = 0;
00141   
00155   virtual void filter_field_sync (const float *input_samples,
00156                                   float *output_samples,
00157                                   int   nsamples,
00158                                   int   offset,
00159                                   int   which_field) = 0;
00160 };
00161 
00162 
00163 #endif /* _ATSC_EQUALIZER_H_ */

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