Merge branch 'dfsg-orig'

[debian/gnuradio] / gr-atsc / src / lib / atsci_fs_correlator_naive.h

diff --git a/gr-atsc/src/lib/atsci_fs_correlator_naive.h b/gr-atsc/src/lib/atsci_fs_correlator_naive.h
new file mode 100644 (file)
index 0000000..c05cff0
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+++ b/gr-atsc/src/lib/atsci_fs_correlator_naive.h
@@ -0,0 +1,69 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2002 Free Software Foundation, Inc.
+ * 
+ * This file is part of GNU Radio
+ * 
+ * GNU Radio is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ * 
+ * GNU Radio is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef _ATSC_FS_CORRELATOR_NAIVE_H_
+#define _ATSC_FS_CORRELATOR_NAIVE_H_
+
+#include <atsci_fs_correlator.h>
+
+/*!
+ * \brief Naive concrete implementation of field sync correlator
+ */
+class atsci_fs_correlator_naive : public atsci_fs_correlator {
+
+ private:
+  static const int     SRSIZE = 1024;          // must be power of two
+  int                  d_index;                // points at oldest sample
+  float                        d_sample_sr[SRSIZE];    // sample shift register
+  unsigned char                d_bit_sr[SRSIZE];       // binary decision shift register
+
+  static const int     OFFSET_511 = 0;         // offset to PN 511 pattern
+  static const int     LENGTH_511 = 511 + 4;   // length of PN 511 pattern (+ 4 seg sync)
+  static const int     OFFSET_2ND_63 = 578;    // offset to second PN 63 pattern
+  static const int     LENGTH_2ND_63 = 63;     // length of PN 63 pattern
+
+  static unsigned char s_511[LENGTH_511];      // PN 511 pattern
+  static unsigned char s_63[LENGTH_2ND_63];    // PN 63 pattern
+
+  inline static int wrap (int index){ return index & (SRSIZE - 1); }
+  inline static int incr (int index){ return wrap (index + 1); }
+  inline static int decr (int index){ return wrap (index - 1); }
+
+ public:
+
+  // CREATORS
+  atsci_fs_correlator_naive ();
+  ~atsci_fs_correlator_naive ();
+
+  // MANIPULATORS
+  virtual void reset ();
+  void filter (float input_sample, float *output_sample, float *output_tag);
+
+  // ACCESSORS
+
+  //! return delay in samples from input to output
+  int delay () const;
+  
+};
+
+
+#endif /* _ATSC_FS_CORRELATOR_NAIVE_H_ */