3 * Copyright 2005,2006 Free Software Foundation, Inc.
5 * This file is part of GNU Radio
7 * GNU Radio is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 3, or (at your option)
12 * GNU Radio is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with GNU Radio; see the file COPYING. If not, write to
19 * the Free Software Foundation, Inc., 51 Franklin Street,
20 * Boston, MA 02110-1301, USA.
22 #ifndef INCLUDED_GR_PROBE_AVG_MAG_SQRD_CF_H
23 #define INCLUDED_GR_PROBE_AVG_MAG_SQRD_CF_H
25 #include <gr_sync_block.h>
26 #include <gr_single_pole_iir.h>
28 class gr_probe_avg_mag_sqrd_cf;
29 typedef boost::shared_ptr<gr_probe_avg_mag_sqrd_cf> gr_probe_avg_mag_sqrd_cf_sptr;
31 gr_probe_avg_mag_sqrd_cf_sptr
32 gr_make_probe_avg_mag_sqrd_cf (double threshold_db, double alpha = 0.0001);
35 * \brief compute avg magnitude squared.
41 * Compute a running average of the magnitude squared of the the input.
42 * The level and indication as to whether the level exceeds threshold
43 * can be retrieved with the level and unmuted accessors.
46 class gr_probe_avg_mag_sqrd_cf : public gr_sync_block
49 gr_single_pole_iir<double,double,double> d_iir;
53 friend gr_probe_avg_mag_sqrd_cf_sptr
54 gr_make_probe_avg_mag_sqrd_cf (double threshold_db, double alpha);
56 gr_probe_avg_mag_sqrd_cf (double threshold_db, double alpha);
59 ~gr_probe_avg_mag_sqrd_cf ();
61 int work (int noutput_items,
62 gr_vector_const_void_star &input_items,
63 gr_vector_void_star &output_items);
66 bool unmuted () const { return d_unmuted; }
67 double level () const { return d_level; }
69 double threshold() const;
72 void set_alpha (double alpha);
73 void set_threshold (double decibels);
76 #endif /* INCLUDED_GR_PROBE_AVG_MAG_SQRD_CF_H */