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diff --git a/gr-atsc/src/lib/atsc_viterbi_decoder.h b/gr-atsc/src/lib/atsc_viterbi_decoder.h
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+/* -*- c++ -*- */
+/*
+ * Copyright 2006 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 INCLUDED_ATSC_VITERBI_DECODER_H
+#define INCLUDED_ATSC_VITERBI_DECODER_H
+
+#include <gr_sync_block.h>
+#include <atsci_viterbi_decoder.h>
+
+class atsc_viterbi_decoder;
+typedef boost::shared_ptr<atsc_viterbi_decoder> atsc_viterbi_decoder_sptr;
+
+atsc_viterbi_decoder_sptr atsc_make_viterbi_decoder();
+
+/*!
+ * \brief ATSC 12-way interleaved viterbi decoder (atsc_soft_data_segment --> atsc_mpeg_packet_rs_encoded)
+ * \ingroup atsc
+ *
+ * input: atsc_soft_data_segment; output: atsc_mpeg_packet_rs_encoded
+ */
+class atsc_viterbi_decoder : public gr_sync_block
+{
+  friend atsc_viterbi_decoder_sptr atsc_make_viterbi_decoder();
+
+  atsci_viterbi_decoder	d_viterbi_decoder;
+
+  atsc_viterbi_decoder();
+
+public:
+  int work (int noutput_items,
+	    gr_vector_const_void_star &input_items,
+	    gr_vector_void_star &output_items);
+
+  void reset() { /* nop */ }
+
+protected:
+  int	    last_start;
+
+};
+
+
+#endif /* INCLUDED_ATSC_VITERBI_DECODER_H */