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diff --git a/gr-dtv/lib/atsc/atsc_viterbi_decoder_impl.h b/gr-dtv/lib/atsc/atsc_viterbi_decoder_impl.h
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+++ b/gr-dtv/lib/atsc/atsc_viterbi_decoder_impl.h
@@ -0,0 +1,76 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2014 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_DTV_ATSC_VITERBI_DECODER_IMPL_H
+#define INCLUDED_DTV_ATSC_VITERBI_DECODER_IMPL_H
+
+#include <gnuradio/dtv/atsc_viterbi_decoder.h>
+#include <gnuradio/dtv/atsc_consts.h>
+#include "atsc_syminfo_impl.h"
+#include "atsc_interleaver_fifo.h"
+
+#define	USE_SIMPLE_SLICER  0
+#define NCODERS 12
+
+#if USE_SIMPLE_SLICER
+#include "atsc_fake_single_viterbi.h"
+#else
+#include "atsc_single_viterbi.h"
+#endif
+
+namespace gr {
+  namespace dtv {
+
+#if USE_SIMPLE_SLICER
+    typedef atsc_fake_single_viterbi single_viterbi_t;
+#else
+    typedef atsc_single_viterbi      single_viterbi_t;
+#endif
+
+    class atsc_viterbi_decoder_impl : public atsc_viterbi_decoder
+    {
+    private:
+      int last_start;
+      typedef interleaver_fifo<unsigned char> fifo_t;
+
+      static const int SEGMENT_SIZE = ATSC_MPEG_RS_ENCODED_LENGTH;	// 207
+      static const int OUTPUT_SIZE = (SEGMENT_SIZE * 12);
+      static const int INPUT_SIZE = (ATSC_DATA_SEGMENT_LENGTH * 12);
+
+      single_viterbi_t viterbi[NCODERS];
+      fifo_t *fifo[NCODERS];
+
+    public:
+      atsc_viterbi_decoder_impl();
+      ~atsc_viterbi_decoder_impl();
+
+      void reset();
+
+      virtual int work(int noutput_items,
+                       gr_vector_const_void_star &input_items,
+                       gr_vector_void_star &output_items);
+    };
+
+  } /* namespace dtv */
+} /* namespace gr */
+
+#endif /* INCLUDED_DTV_ATSC_VITERBI_DECODER_IMPL_H */