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diff --git a/gr-blocks/lib/moving_average_impl.h b/gr-blocks/lib/moving_average_impl.h
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+++ b/gr-blocks/lib/moving_average_impl.h
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+/* -*- c++ -*- */
+/*
+ * Copyright 2008,2013,2017-2018 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 MOVING_AVERAGE_IMPL_H
+#define MOVING_AVERAGE_IMPL_H
+
+#include <gnuradio/blocks/moving_average.h>
+#include <vector>
+#include <algorithm>
+
+namespace gr {
+  namespace blocks {
+
+template<class T>
+    class moving_average_impl : public  moving_average<T>
+    {
+    private:
+      int d_length;
+      T d_scale;
+      int d_max_iter;
+      unsigned int d_vlen;
+      std::vector<T> d_sum;
+
+
+      int d_new_length;
+      T d_new_scale;
+      bool d_updated;
+
+    public:
+      moving_average_impl (int length, T scale,
+                  int max_iter = 4096,
+                  unsigned int vlen = 1);
+      ~moving_average_impl ();
+
+      int length() const { return d_new_length; }
+      T scale() const { return d_new_scale; }
+      unsigned int vlen() const { return d_vlen; }
+
+      void set_length_and_scale(int length, T scale);
+      void set_length(int length);
+      void set_scale(T scale);
+
+      int work(int noutput_items,
+               gr_vector_const_void_star &input_items,
+               gr_vector_void_star &output_items);
+
+    };
+
+  } /* namespace blocks */
+} /* namespace gr */
+
+#endif /* MOVING_AVERAGE_IMPL_H */