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diff --git a/gr-blocks/lib/peak_detector_impl.h b/gr-blocks/lib/peak_detector_impl.h
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+++ b/gr-blocks/lib/peak_detector_impl.h
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+/* -*- c++ -*- */
+/*
+ * Copyright 2007,2013,2018 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 PEAK_DETECTOR_IMPL_H
+#define PEAK_DETECTOR_IMPL_H
+
+#include <gnuradio/blocks/peak_detector.h>
+
+namespace gr {
+  namespace blocks {
+
+    template <class T>
+    class peak_detector_impl : public peak_detector<T>
+    {
+    private:
+      float d_threshold_factor_rise;
+      float d_threshold_factor_fall;
+      int d_look_ahead;
+      float d_avg_alpha;
+      float d_avg;
+
+    public:
+      peak_detector_impl(float threshold_factor_rise,
+                  float threshold_factor_fall,
+                  int look_ahead, float alpha);
+      ~peak_detector_impl();
+
+      void set_threshold_factor_rise(float thr) { d_threshold_factor_rise = thr; }
+      void set_threshold_factor_fall(float thr) { d_threshold_factor_fall = thr; }
+      void set_look_ahead(int look) { d_look_ahead = look; }
+      void set_alpha(float alpha) { d_avg_alpha = alpha; }
+      float threshold_factor_rise() { return d_threshold_factor_rise; }
+      float threshold_factor_fall() { return d_threshold_factor_fall; }
+      int look_ahead() { return d_look_ahead; }
+      float alpha() { return d_avg_alpha; }
+
+      int work(int noutput_items,
+               gr_vector_const_void_star &input_items,
+               gr_vector_void_star &output_items);
+    };
+
+  } /* namespace blocks */
+} /* namespace gr */
+
+#endif /* PEAK_DETECTOR_IMPL_H */