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diff --git a/gr-digital/include/digital_diff_phasor_cc.h b/gr-digital/include/digital_diff_phasor_cc.h
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+++ b/gr-digital/include/digital_diff_phasor_cc.h
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+/* -*- c++ -*- */
+/*
+ * Copyright 2006,2012 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_GR_DIFF_PHASOR_CC_H
+#define INCLUDED_GR_DIFF_PHASOR_CC_H
+
+#include <digital_api.h>
+#include <gr_sync_block.h>
+
+/*!
+ * \brief Differential decoding based on phase change.
+ * \ingroup coding_blk
+ *
+ * Uses the phase difference between two symbols to determine the
+ * output symbol:
+ *
+ *     out[i] = in[i] * conj(in[i-1]);
+ */
+class digital_diff_phasor_cc;
+typedef boost::shared_ptr<digital_diff_phasor_cc> digital_diff_phasor_cc_sptr;
+
+DIGITAL_API digital_diff_phasor_cc_sptr digital_make_diff_phasor_cc();
+
+
+class DIGITAL_API digital_diff_phasor_cc : public gr_sync_block
+{
+  friend DIGITAL_API digital_diff_phasor_cc_sptr
+    digital_make_diff_phasor_cc();
+
+  digital_diff_phasor_cc();  //constructor
+
+ public:
+  ~digital_diff_phasor_cc();	//destructor
+
+  int work(int noutput_items,
+	   gr_vector_const_void_star &input_items,
+	   gr_vector_void_star &output_items);
+};
+
+#endif