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diff --git a/gr-atsc/include/atsc/trellis_encoder_impl.h b/gr-atsc/include/atsc/trellis_encoder_impl.h
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+++ b/gr-atsc/include/atsc/trellis_encoder_impl.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_TRELLIS_ENCODER_H_
+#define _ATSC_TRELLIS_ENCODER_H_
+
+#include <atsc/api.h>
+#include <atsc/basic_trellis_encoder_impl.h>
+#include <atsc/types.h>
+
+/*!
+ * \brief fancy, schmancy 12-way interleaved trellis encoder for ATSC
+ */
+
+class ATSC_API atsci_trellis_encoder {
+ public:
+  static const int	NCODERS = 12;
+
+  atsci_trellis_encoder ();
+  ~atsci_trellis_encoder ();
+
+  //! reset all encoder states
+  void reset ();
+
+  /*!
+   * Take 12 RS encoded, convolutionally interleaved segments and
+   * produce 12 trellis coded data segments.  We work in groups of 12
+   * because that's the smallest number of segments that composes a
+   * single full cycle of the encoder mux.
+   */
+  void encode (atsc_data_segment out[NCODERS],
+	       const atsc_mpeg_packet_rs_encoded in[NCODERS]);
+
+
+ protected:
+  static const int SEGMENT_SIZE = ATSC_MPEG_RS_ENCODED_LENGTH;	// 207
+  static const int INPUT_SIZE = (SEGMENT_SIZE * 12);
+  static const int OUTPUT_SIZE = (ATSC_DATA_SEGMENT_LENGTH * 12);
+
+  void encode_helper (unsigned char out[OUTPUT_SIZE],
+		      const unsigned char in[INPUT_SIZE]);
+
+  atsci_basic_trellis_encoder	enc[NCODERS];
+  bool				debug;
+};
+
+
+#endif /* _ATSC_TRELLIS_ENCODER_H_ */