3 * Copyright 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.
23 #ifndef _GRI_AGC2_CC_H_
24 #define _GRI_AGC2_CC_H_
29 * \brief high performance Automatic Gain Control class
31 * For Power the absolute value of the complex number is used.
36 gri_agc2_cc (float attack_rate = 1e-1, float decay_rate = 1e-2, float reference = 1.0,
37 float gain = 1.0, float max_gain = 0.0)
38 : _attack_rate(attack_rate), _decay_rate(decay_rate), _reference(reference),
39 _gain(gain), _max_gain(max_gain) {};
41 float decay_rate () const { return _decay_rate; }
42 float attack_rate () const { return _attack_rate; }
43 float reference () const { return _reference; }
44 float gain () const { return _gain; }
45 float max_gain() const { return _max_gain; }
47 void set_decay_rate (float rate) { _decay_rate = rate; }
48 void set_attack_rate (float rate) { _attack_rate = rate; }
49 void set_reference (float reference) { _reference = reference; }
50 void set_gain (float gain) { _gain = gain; }
51 void set_max_gain(float max_gain) { _max_gain = max_gain; }
53 gr_complex scale (gr_complex input){
54 gr_complex output = input * _gain;
56 float tmp = -_reference + sqrt(output.real()*output.real() +
57 output.imag()*output.imag());
58 float rate = _decay_rate;
64 fprintf(stdout, "rate = %f\ttmp = %f\t gain = %f\n", rate, tmp, _gain);
67 // Not sure about this; will blow up if _gain < 0 (happens when rates are too high),
68 // but is this the solution?
72 if (_max_gain > 0.0 && _gain > _max_gain)
77 void scaleN (gr_complex output[], const gr_complex input[], unsigned n){
78 for (unsigned i = 0; i < n; i++)
79 output[i] = scale (input[i]);
83 float _attack_rate; // attack rate for fast changing signals
84 float _decay_rate; // decay rate for slow changing signals
85 float _reference; // reference value
86 float _gain; // current gain
87 float _max_gain; // max allowable gain
90 #endif /* _GRI_AGC2_CC_H_ */