GNU Radio 3.7.2 C++ API
fs_correlator_naive_impl.h
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1 /* -*- c++ -*- */
2 /*
3  * Copyright 2002 Free Software Foundation, Inc.
4  *
5  * This file is part of GNU Radio
6  *
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22 
23 #ifndef _ATSC_FS_CORRELATOR_NAIVE_H_
24 #define _ATSC_FS_CORRELATOR_NAIVE_H_
25 
26 #include <gnuradio/atsc/api.h>
28 
29 /*!
30  * \brief Naive concrete implementation of field sync correlator
31  */
33 
34  private:
35  static const int SRSIZE = 1024; // must be power of two
36  int d_index; // points at oldest sample
37  float d_sample_sr[SRSIZE]; // sample shift register
38  unsigned char d_bit_sr[SRSIZE]; // binary decision shift register
39 
40  static const int OFFSET_511 = 0; // offset to PN 511 pattern
41  static const int LENGTH_511 = 511 + 4; // length of PN 511 pattern (+ 4 seg sync)
42  static const int OFFSET_2ND_63 = 578; // offset to second PN 63 pattern
43  static const int LENGTH_2ND_63 = 63; // length of PN 63 pattern
44 
45  static unsigned char s_511[LENGTH_511]; // PN 511 pattern
46  static unsigned char s_63[LENGTH_2ND_63]; // PN 63 pattern
47 
48  inline static int wrap (int index){ return index & (SRSIZE - 1); }
49  inline static int incr (int index){ return wrap (index + 1); }
50  inline static int decr (int index){ return wrap (index - 1); }
51 
52  public:
53 
54  // CREATORS
57 
58  // MANIPULATORS
59  virtual void reset ();
60  void filter (float input_sample, float *output_sample, float *output_tag);
61 
62  // ACCESSORS
63 
64  //! return delay in samples from input to output
65  int delay () const;
66 
67 };
68 
69 
70 #endif /* _ATSC_FS_CORRELATOR_NAIVE_H_ */
virtual void reset()=0
virtual int delay() const =0
return delay in samples from input to output
Naive concrete implementation of field sync correlator.
Definition: fs_correlator_naive_impl.h:32
#define ATSC_API
Definition: gr-atsc/include/gnuradio/atsc/api.h:30
virtual void filter(float input_sample, float *output_sample, float *output_tag)=0
abstract base class for ATSC field sync correlator
Definition: fs_correlator_impl.h:48