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diff --git a/gr-atsc/src/lib/atsci_data_interleaver.h b/gr-atsc/src/lib/atsci_data_interleaver.h
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+++ b/gr-atsc/src/lib/atsci_data_interleaver.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 2, 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., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef _ATSC_DATA_INTERLEAVER_H_
+#define _ATSC_DATA_INTERLEAVER_H_
+
+#include <atsc_types.h>
+#include <convolutional_interleaver.h>
+
+/*!
+ * \brief atsc convolutional data interleaver
+ */
+class atsci_data_interleaver : public convolutional_interleaver<unsigned char> {
+ public:
+  atsci_data_interleaver () : convolutional_interleaver<unsigned char>(true, 52, 4) {}
+
+  void interleave (atsc_mpeg_packet_rs_encoded &out,
+		   const atsc_mpeg_packet_rs_encoded &in);
+};
+
+/*!
+ * \brief atsc convolutional data deinterleaver
+ */
+class atsci_data_deinterleaver : public convolutional_interleaver<unsigned char> {
+ public:
+  atsci_data_deinterleaver () :
+    convolutional_interleaver<unsigned char>(false, 52, 4), alignment_fifo (156) {}
+
+  void deinterleave (atsc_mpeg_packet_rs_encoded &out,
+		     const atsc_mpeg_packet_rs_encoded &in);
+
+private:
+  /*!
+   * Note: The use of the alignment_fifo keeps the encoder and decoder
+   * aligned if both are synced to a field boundary.  There may be other
+   * ways to implement this function.  This is a best guess as to how
+   * this should behave, as we have no test vectors for either the
+   * interleaver or deinterleaver.
+   */
+  interleaver_fifo<unsigned char> alignment_fifo;
+
+  static void remap_pli (plinfo &out, const plinfo &in);
+};
+
+#endif /* _ATSC_DATA_INTERLEAVER_H_ */