GNU Radio 3.6.5.1 C++ API
gr_peak_detector2_fb.h
Go to the documentation of this file.
1
/* -*- c++ -*- */
2
/*
3
* Copyright 2007 Free Software Foundation, Inc.
4
*
5
* This file is part of GNU Radio
6
*
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)
10
* any later version.
11
*
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.
16
*
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.
21
*/
22
23
#ifndef INCLUDED_gr_peak_detector2_FB_H
24
#define INCLUDED_gr_peak_detector2_FB_H
25
26
#include <
gr_core_api.h
>
27
#include <
gr_sync_block.h
>
28
29
class
gr_peak_detector2_fb
;
30
typedef
boost::shared_ptr<gr_peak_detector2_fb>
gr_peak_detector2_fb_sptr
;
31
32
GR_CORE_API
gr_peak_detector2_fb_sptr
gr_make_peak_detector2_fb
(
float
threshold_factor_rise
= 7,
33
int
look_ahead
= 1000,
34
float
alpha
= 0.001);
35
36
/*!
37
* \brief Detect the peak of a signal
38
*
39
* If a peak is detected, this block outputs a 1,
40
* or it outputs 0's. A separate debug output may be connected, to
41
* view the internal EWMA described below.
42
*
43
* \param threshold_factor_rise The threshold factor determins when a peak
44
* is present. An EWMA average of the signal is calculated and when the
45
* value of the signal goes over threshold_factor_rise*average, we
46
* call the peak.
47
* \param look_ahead The look-ahead value is used when the threshold is
48
* found to locate the peak within this range.
49
* \param alpha The gain value of a single-pole moving average filter
50
*/
51
52
class
GR_CORE_API
gr_peak_detector2_fb
:
public
gr_sync_block
53
{
54
friend
GR_CORE_API
gr_peak_detector2_fb_sptr
55
gr_make_peak_detector2_fb
(
float
threshold_factor_rise,
int
look_ahead,
float
alpha);
56
57
gr_peak_detector2_fb
(
float
threshold_factor_rise,
int
look_ahead,
float
alpha);
58
59
private
:
60
float
d_threshold_factor_rise;
61
int
d_look_ahead;
62
int
d_look_ahead_remaining;
63
int
d_peak_ind;
64
float
d_peak_val;
65
float
d_alpha;
66
float
d_avg;
67
bool
d_found;
68
69
public
:
70
71
/*! \brief Set the threshold factor value for the rise time
72
* \param thr new threshold factor
73
*/
74
void
set_threshold_factor_rise
(
float
thr) { d_threshold_factor_rise = thr; }
75
76
/*! \brief Set the look-ahead factor
77
* \param look new look-ahead factor
78
*/
79
void
set_look_ahead
(
int
look) { d_look_ahead = look; }
80
81
/*! \brief Set the running average alpha
82
* \param alpha new alpha for running average
83
*/
84
void
set_alpha
(
int
alpha) { d_alpha = alpha; }
85
86
/*! \brief Get the threshold factor value for the rise time
87
* \return threshold factor
88
*/
89
float
threshold_factor_rise
() {
return
d_threshold_factor_rise; }
90
91
/*! \brief Get the look-ahead factor value
92
* \return look-ahead factor
93
*/
94
int
look_ahead
() {
return
d_look_ahead; }
95
96
/*! \brief Get the alpha value of the running average
97
* \return alpha
98
*/
99
float
alpha
() {
return
d_alpha; }
100
101
int
work
(
int
noutput_items,
102
gr_vector_const_void_star
&input_items,
103
gr_vector_void_star
&output_items);
104
};
105
106
#endif
107
108
gnuradio-core
src
lib
general
gr_peak_detector2_fb.h
Generated on Mon Aug 19 2013 15:37:30 for GNU Radio 3.6.5.1 C++ API by
1.8.1.2