1 files changed, 75 insertions, 0 deletions
diff --git a/gr-digital/include/digital_probe_density_b.h b/gr-digital/include/digital_probe_density_b.h
new file mode 100644
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+++ b/gr-digital/include/digital_probe_density_b.h
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+/* -*- c++ -*- */
+/*
+ * Copyright 2008,2012 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.
+ */
+#ifndef INCLUDED_GR_PROBE_DENSITY_B_H
+#define INCLUDED_GR_PROBE_DENSITY_B_H
+
+#include <digital_api.h>
+#include <gr_sync_block.h>
+
+class digital_probe_density_b;
+
+typedef boost::shared_ptr<digital_probe_density_b> digital_probe_density_b_sptr;
+
+DIGITAL_API digital_probe_density_b_sptr
+digital_make_probe_density_b(double alpha);
+
+/*!
+ * This block maintains a running average of the input stream and
+ * makes it available as an accessor function.  The input stream
+ * is type unsigned char.
+ *
+ * If you send this block a stream of unpacked bytes, it will tell
+ * you what the bit density is.
+ *
+ * \param alpha     Average filter constant
+ *
+ */
+
+class DIGITAL_API digital_probe_density_b : public gr_sync_block
+{
+private:
+  friend DIGITAL_API digital_probe_density_b_sptr
+    digital_make_probe_density_b(double alpha);
+
+  double d_alpha;
+  double d_beta;
+  double d_density;
+
+  digital_probe_density_b(double alpha);
+
+public:
+  ~digital_probe_density_b();
+
+  /*!
+   * \brief Returns the current density value
+   */
+  double density() const { return d_density; }
+
+  /*!
+   * \brief Set the average filter constant
+   */
+  void set_alpha(double alpha);
+
+  int work(int noutput_items,
+	   gr_vector_const_void_star &input_items,
+	   gr_vector_void_star &output_items);
+};
+
+#endif /* INCLUDED_GR_PROBE_DENSITY_B_H */