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diff --git a/gr-atsc/src/lib/atsci_single_viterbi.h b/gr-atsc/src/lib/atsci_single_viterbi.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 _ATSCSINGLEVITERBI_H_
+#define _ATSCSINGLEVITERBI_H_
+
+/*!
+ * \brief single channel viterbi decoder
+ */
+class atsci_single_viterbi
+{
+  
+public:
+  atsci_single_viterbi ();
+
+  static const unsigned int TB_LEN = 32;
+
+  /*!
+   * \p INPUT ideally takes on the values +/- 1,3,5,7
+   * return is decoded dibit in the range [0, 3]
+   */
+  char decode (float input);
+
+  void reset ();
+
+  //! internal delay of decoder
+  int delay () { return TB_LEN - 1; }
+
+protected:
+  static const int transition_table[32];
+  static const float was_sent[32];
+  float path_metrics [2][8];
+  unsigned long long traceback [2][8];
+  unsigned char phase;
+};
+
+#endif