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diff --git a/gr-atsc/src/lib/atsci_fs_checker_naive.h b/gr-atsc/src/lib/atsci_fs_checker_naive.h
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+/* -*- 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_CHECKER_NAIVE_H_
+#define _ATSC_FS_CHECKER_NAIVE_H_
+
+#include <atsci_fs_checker.h>
+
+/*!
+ * \brief Naive concrete implementation of field sync checker
+ */
+class atsci_fs_checker_naive : public atsci_fs_checker {
+
+ 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
+  atsc::syminfo		d_tag_sr[SRSIZE];	// tag shift register
+  unsigned char		d_bit_sr[SRSIZE];	// binary decision shift register
+  int			d_field_num;
+  int			d_segment_num;
+
+  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_checker_naive ();
+  ~atsci_fs_checker_naive ();
+
+  // MANIPULATORS
+  virtual void reset ();
+  void filter (float input_sample, atsc::syminfo input_tag,
+	       float *output_sample, atsc::syminfo *output_tag);
+
+  // ACCESSORS
+
+  //! return delay in samples from input to output
+  int delay () const;
+  
+};
+
+
+#endif /* _ATSC_FS_CHECKER_NAIVE_H_ */