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atsc_fs_checker_naive.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 2, 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., 59 Temple Place - Suite 330, 00020 * Boston, MA 02111-1307, USA. 00021 */ 00022 00023 #ifndef _ATSC_FS_CHECKER_NAIVE_H_ 00024 #define _ATSC_FS_CHECKER_NAIVE_H_ 00025 00026 #include <atsc_fs_checker.h> 00027 00031 class atsc_fs_checker_naive : public atsc_fs_checker { 00032 00033 private: 00034 static const int SRSIZE = 1024; // must be power of two 00035 int d_index; // points at oldest sample 00036 float d_sample_sr[SRSIZE]; // sample shift register 00037 atsc::syminfo d_tag_sr[SRSIZE]; // tag shift register 00038 unsigned char d_bit_sr[SRSIZE]; // binary decision shift register 00039 int d_field_num; 00040 int d_segment_num; 00041 00042 static const int OFFSET_511 = 0; // offset to PN 511 pattern 00043 static const int LENGTH_511 = 511 + 4; // length of PN 511 pattern (+ 4 seg sync) 00044 static const int OFFSET_2ND_63 = 578; // offset to second PN 63 pattern 00045 static const int LENGTH_2ND_63 = 63; // length of PN 63 pattern 00046 00047 static unsigned char s_511[LENGTH_511]; // PN 511 pattern 00048 static unsigned char s_63[LENGTH_2ND_63]; // PN 63 pattern 00049 00050 inline static int wrap (int index){ return index & (SRSIZE - 1); } 00051 inline static int incr (int index){ return wrap (index + 1); } 00052 inline static int decr (int index){ return wrap (index - 1); } 00053 00054 public: 00055 00056 // CREATORS 00057 atsc_fs_checker_naive (); 00058 ~atsc_fs_checker_naive (); 00059 00060 // MANIPULATORS 00061 virtual void reset (); 00062 void filter (float input_sample, atsc::syminfo input_tag, 00063 float *output_sample, atsc::syminfo *output_tag); 00064 00065 // ACCESSORS 00066 00068 int delay () const; 00069 00070 }; 00071 00072 00073 #endif /* _ATSC_FS_CHECKER_NAIVE_H_ */

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