--- /dev/null
+/* -*- c++ -*- */
+/*
+ * Copyright 2008 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.
+ */
+
+// @WARNING@
+
+#ifndef @GUARD_NAME@
+#define @GUARD_NAME@
+
+#include <gr_sync_block.h>
+
+class @NAME@;
+
+typedef boost::shared_ptr<@NAME@> @SPTR_NAME@;
+
+@SPTR_NAME@ gr_make_@BASE_NAME@ (int length, @O_TYPE@ scale, int max_iter = 4096);
+
+/*!
+ * \brief output is the moving sum of the last N samples, scaled by the scale factor
+ * \ingroup filter_blk
+ *
+ * max_iter limits how long we go without flushing the accumulator
+ * This is necessary to avoid numerical instability for float and complex.
+ */
+class @NAME@ : public gr_sync_block
+{
+private:
+ friend @SPTR_NAME@ gr_make_@BASE_NAME@(int length, @O_TYPE@ scale, int max_iter);
+
+ @NAME@ (int length, @O_TYPE@ scale, int max_iter = 4096);
+
+ int d_length;
+ @O_TYPE@ d_scale;
+ int d_max_iter;
+
+ int d_new_length;
+ @O_TYPE@ d_new_scale;
+ bool d_updated;
+
+public:
+ ~@NAME@ ();
+
+ int work (int noutput_items,
+ gr_vector_const_void_star &input_items,
+ gr_vector_void_star &output_items);
+
+ int length() const { return d_new_length; }
+ @O_TYPE@ scale() const { return d_new_scale; }
+
+ void set_length_and_scale(int length, @O_TYPE@ scale);
+};
+
+#endif /* @GUARD_NAME@ */