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diff --git a/gr-blocks/lib/rms_cf_impl.h b/gr-blocks/lib/rms_cf_impl.h
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+++ b/gr-blocks/lib/rms_cf_impl.h
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+/* -*- c++ -*- */
+/*
+ * Copyright 2005,2013 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_BLOCKS_RMS_CF_IMPL_H
+#define INCLUDED_BLOCKS_RMS_CF_IMPL_H
+
+#include <blocks/rms_cf.h>
+#include <gr_single_pole_iir.h>
+
+namespace gr {
+  namespace blocks {
+
+    /*!
+     * \brief RMS average power
+     * \ingroup math_blk
+     */
+    class rms_cf_impl : public rms_cf
+    {
+    private:
+      gr_single_pole_iir<double,double,double> d_iir;
+
+    public:
+      rms_cf_impl(double alpha = 0.0001);
+      ~rms_cf_impl();
+
+      void set_alpha(double alpha);
+      
+      int work(int noutput_items,
+               gr_vector_const_void_star &input_items,
+               gr_vector_void_star &output_items);
+
+    };
+
+  } /* namespace blocks */
+} /* namespace gr */
+
+#endif /* INCLUDED_BLOCKS_RMS_CF_IMPL_H */