1 files changed, 73 insertions, 0 deletions
diff --git a/gr-digital/lib/probe_density_b_impl.cc b/gr-digital/lib/probe_density_b_impl.cc
new file mode 100644
index 0000000000..532930ad1b
--- /dev/null
+++ b/gr-digital/lib/probe_density_b_impl.cc
@@ -0,0 +1,73 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2008,2010,2012 Free Software Foundation, Inc.
+ *
+ * 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.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include "probe_density_b_impl.h"
+#include <gr_io_signature.h>
+#include <iostream>
+
+namespace gr {
+  namespace digital {
+
+    probe_density_b::sptr
+    probe_density_b::make(double alpha)
+    {
+      return gnuradio::get_initial_sptr
+	(new probe_density_b_impl(alpha));
+    }
+
+    probe_density_b_impl::probe_density_b_impl(double alpha)
+      : gr_sync_block("density_b",
+		      gr_make_io_signature(1, 1, sizeof(char)),
+		      gr_make_io_signature(0, 0, 0))
+    {
+      set_alpha(alpha);
+      d_density = 1.0;
+    }
+
+    probe_density_b_impl::~probe_density_b_impl()
+    {
+    }
+
+    void
+    probe_density_b_impl::set_alpha(double alpha)
+    {
+      d_alpha = alpha;
+      d_beta = 1.0-d_alpha;
+    }
+
+    int
+    probe_density_b_impl::work(int noutput_items,
+			       gr_vector_const_void_star &input_items,
+			       gr_vector_void_star &output_items)
+    {
+      const char *in = (const char *)input_items[0];
+
+      for(int i = 0; i < noutput_items; i++)
+	d_density = d_alpha*(double)in[i] + d_beta*d_density;
+
+      return noutput_items;
+    }
+
+  } /* namespace digital */
+} /* namespace gr */