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diff --git a/gr-digital/include/digital_binary_slicer_fb.h b/gr-digital/include/digital_binary_slicer_fb.h
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+++ b/gr-digital/include/digital_binary_slicer_fb.h
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+/* -*- c++ -*- */
+/*
+ * Copyright 2006,2011 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_DIGITAL_BINARY_SLICER_FB_H
+#define INCLUDED_DIGITAL_BINARY_SLICER_FB_H
+
+#include <digital_api.h>
+#include <gr_sync_block.h>
+
+class digital_binary_slicer_fb;
+typedef boost::shared_ptr<digital_binary_slicer_fb> digital_binary_slicer_fb_sptr;
+
+DIGITAL_API digital_binary_slicer_fb_sptr digital_make_binary_slicer_fb ();
+
+/*!
+ * \brief slice float binary symbol outputting 1 bit output
+ * \ingroup converter_blk
+ *
+ * x <  0 --> 0
+ * x >= 0 --> 1
+ */
+class DIGITAL_API digital_binary_slicer_fb : public gr_sync_block
+{
+  friend DIGITAL_API digital_binary_slicer_fb_sptr digital_make_binary_slicer_fb ();
+  digital_binary_slicer_fb ();
+
+ public:
+  int work (int noutput_items,
+	    gr_vector_const_void_star &input_items,
+	    gr_vector_void_star &output_items);
+};
+
+#endif