GNU Radio 2.x: gr_simple_squelch_cc.h Source File

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# gr_simple_squelch_cc.h

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    00001 /* -*- c++ -*- */
    00002 /*
    00003  * Copyright 2005 Free Software Foundation, Inc.
    00004  *
    00005  * This file is part of GNU Radio
    00006  *
    00007  * GNU Radio is free software; you can redistribute it and/or modify
    00008  * it under the terms of the GNU General Public License as published by
    00009  * the Free Software Foundation; either version 2, or (at your option)
    00010  * any later version.
    00011  *
    00012  * GNU Radio is distributed in the hope that it will be useful,
    00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
    00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    00015  * GNU General Public License for more details.
    00016  *
    00017  * You should have received a copy of the GNU General Public License
    00018  * along with GNU Radio; see the file COPYING.  If not, write to
    00019  * the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
    00020  * Boston, MA 02111-1307, USA.
    00021  */
    00022 #ifndef INCLUDED_GR_SIMPLE_SQUELCH_CC_H
    00023 #define INCLUDED_GR_SIMPLE_SQUELCH_CC_H
    00024
    00025 #include <gr_sync_block.h>
    00026 #include <gr_single_pole_iir.h>
    00027
    00028 class gr_simple_squelch_cc;
    00029 typedef boost::shared_ptr<gr_simple_squelch_cc> gr_simple_squelch_cc_sptr;
    00030
    00031 gr_simple_squelch_cc_sptr
    00032 gr_make_simple_squelch_cc (double threshold_db, double alpha = 0.0001);
    00033
    00037 class gr_simple_squelch_cc : public gr_sync_block
    00038 {
    00039   double                                        d_threshold;
    00040   gr_single_pole_iir<double,double,double>      d_iir;
    00041   bool                                          d_unmuted;
    00042
    00043   friend gr_simple_squelch_cc_sptr
    00044   gr_make_simple_squelch_cc (double threshold_db, double alpha);
    00045
    00046   gr_simple_squelch_cc (double threshold_db, double alpha);
    00047
    00048 public:
    00049   ~gr_simple_squelch_cc ();
    00050
    00051   int work (int noutput_items,
    00052             gr_vector_const_void_star &input_items,
    00053             gr_vector_void_star &output_items);
    00054
    00055   bool unmuted () const { return d_unmuted; }
    00056
    00057   void set_alpha (double alpha);
    00058   void set_threshold (double decibels);
    00059 };
    00060
    00061 #endif /* INCLUDED_GR_SIMPLE_SQUELCH_CC_H */