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diff --git a/blocks/src/lib/voice_data_unit.h b/blocks/src/lib/voice_data_unit.h
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+++ b/blocks/src/lib/voice_data_unit.h
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+/* -*- C++ -*- */
+
+/*
+ * Copyright 2008 Steve Glass
+ * 
+ * This file is part of OP25.
+ * 
+ * OP25 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.
+ * 
+ * OP25 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 OP25; see the file COPYING.  If not, write to the Free
+ * Software Foundation, Inc., 51 Franklin Street, Boston, MA
+ * 02110-1301, USA.
+ */
+
+#ifndef INCLUDED_VOICE_DATA_UNIT_H
+#define INCLUDED_VOICE_DATA_UNIT_H
+
+#include <abstract_data_unit.h>
+
+/**
+ * P25 Logical Data Unit 1 (compressed IBME voice).
+ */
+class voice_data_unit : public abstract_data_unit
+{
+public:
+
+   /**
+    * voice_data_unit (virtual) destuctor
+    */
+   virtual ~voice_data_unit();
+
+protected:
+
+   /**
+    * voice_data_unit constuctor
+    *
+    * \param frame_body A const_bit_queue representing the frame body.
+    */
+   voice_data_unit(const_bit_queue& frame_body);
+
+   /**
+    * Applies error correction code to the specified bit_vector. Not
+    * that this function removes the PN sequences from the source
+    * frame.
+    *
+    * \param frame_body The bit vector to decode.
+    * \return 
+    */
+   virtual void do_correct_errors(bit_vector& frame_body);
+
+   /**
+    * Decode compressed audio using the supplied imbe_decoder.
+    *
+    * \param frame_body The const_bit_vector to decode.
+    * \param imbe The imbe_decoder to use to generate the audio.
+    */
+   virtual void do_decode_audio(const_bit_vector& frame_body, imbe_decoder& imbe);
+
+   /**
+    * Returns the expected size (in bits) of this data_unit. For
+    * variable-length data this should return UINT16_MAX until the
+    * actual length of this frame is known.
+    *
+    * \return The expected size (in bits) of this data_unit when encoded.
+    */
+   virtual uint16_t frame_size_max() const;
+
+};
+
+#endif /* INCLUDED_VOICE_DATA_UNIT_H */