Imported Upstream version 3.2.2

[debian/gnuradio] / gnuradio-core / src / lib / general / gr_probe_avg_mag_sqrd_cf.cc

diff --git a/gnuradio-core/src/lib/general/gr_probe_avg_mag_sqrd_cf.cc b/gnuradio-core/src/lib/general/gr_probe_avg_mag_sqrd_cf.cc
new file mode 100644 (file)
index 0000000..8b1c7cc
--- /dev/null
+++ b/gnuradio-core/src/lib/general/gr_probe_avg_mag_sqrd_cf.cc
@@ -0,0 +1,86 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2005,2007 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.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+#include <gr_probe_avg_mag_sqrd_cf.h>
+#include <gr_io_signature.h>
+#include <cmath>
+
+gr_probe_avg_mag_sqrd_cf_sptr
+gr_make_probe_avg_mag_sqrd_cf(double threshold_db, double alpha)
+{
+  return gr_probe_avg_mag_sqrd_cf_sptr(new gr_probe_avg_mag_sqrd_cf(threshold_db, alpha));
+}
+
+gr_probe_avg_mag_sqrd_cf::gr_probe_avg_mag_sqrd_cf (double threshold_db, double alpha)
+  : gr_sync_block ("probe_avg_mag_sqrd_cf",
+                  gr_make_io_signature(1, 1, sizeof(gr_complex)),
+                  gr_make_io_signature(1, 1, sizeof(float))),
+    d_iir(alpha), d_unmuted(false), d_level(0)
+{
+  set_threshold (threshold_db);
+}
+
+gr_probe_avg_mag_sqrd_cf::~gr_probe_avg_mag_sqrd_cf()
+{
+}
+
+
+int
+gr_probe_avg_mag_sqrd_cf::work(int noutput_items,
+                          gr_vector_const_void_star &input_items,
+                          gr_vector_void_star &output_items)
+{
+  const gr_complex *in = (const gr_complex *) input_items[0];
+  float *out = (float *) output_items[0];
+
+  for (int i = 0; i < noutput_items; i++){
+    out[i] = d_iir.prev_output();
+    double mag_sqrd = in[i].real()*in[i].real() + in[i].imag()*in[i].imag();
+    d_iir.filter(mag_sqrd);    // computed for side effect: prev_output()
+  }
+
+  d_unmuted = d_iir.prev_output() >= d_threshold;
+  d_level = d_iir.prev_output();
+  return noutput_items;
+}
+
+double
+gr_probe_avg_mag_sqrd_cf::threshold() const
+{
+  return 10 * std::log10(d_threshold);
+}
+
+void
+gr_probe_avg_mag_sqrd_cf::set_threshold(double decibels)
+{
+  // convert to absolute threshold (mag squared)
+  d_threshold = std::pow(10.0, decibels/10);
+}
+
+void
+gr_probe_avg_mag_sqrd_cf::set_alpha(double alpha)
+{
+  d_iir.set_taps(alpha);
+}