GNU Radio 3.6.5.1 C++ API
gr_single_pole_iir_filter_ff.h
Go to the documentation of this file.
1
/* -*- c++ -*- */
2
/*
3
* Copyright 2004,2005 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_SINGLE_POLE_IIR_FILTER_FF_H
24
#define INCLUDED_GR_SINGLE_POLE_IIR_FILTER_FF_H
25
26
#include <
gr_core_api.h
>
27
#include <
gr_sync_block.h
>
28
#include <
gr_single_pole_iir.h
>
29
#include <stdexcept>
30
31
class
gr_single_pole_iir_filter_ff
;
32
typedef
boost::shared_ptr<gr_single_pole_iir_filter_ff>
gr_single_pole_iir_filter_ff_sptr
;
33
34
GR_CORE_API
gr_single_pole_iir_filter_ff_sptr
35
gr_make_single_pole_iir_filter_ff
(
double
alpha,
unsigned
int
vlen=1);
36
37
/*!
38
* \brief single pole IIR filter with float input, float output
39
*
40
* The input and output satisfy a difference equation of the form
41
\htmlonly
42
\f{
43
y[n] - (1-alpha) y[n-1] = alpha x[n]
44
\f}
45
\endhtmlonly
46
47
\xmlonly
48
y[n] - (1-alpha) y[n-1] = alpha x[n]
49
\endxmlonly
50
51
* with the corresponding rational system function
52
\htmlonly
53
\f{
54
H(z) = \frac{alpha}{1 - (1-alpha) z^{-1}}
55
\f}
56
\endhtmlonly
57
58
\xmlonly
59
H(z) = \ frac{alpha}{1 - (1-alpha) z^{-1}}
60
\endxmlonly
61
62
* Note that some texts define the system function with a + in the denominator.
63
* If you're using that convention, you'll need to negate the feedback tap.
64
*/
65
class
GR_CORE_API
gr_single_pole_iir_filter_ff
:
public
gr_sync_block
66
{
67
private
:
68
friend
GR_CORE_API
gr_single_pole_iir_filter_ff_sptr
69
gr_make_single_pole_iir_filter_ff
(
double
alpha,
unsigned
int
vlen);
70
71
unsigned
int
d_vlen;
72
std::vector<gr_single_pole_iir<float,float,double> > d_iir;
73
74
gr_single_pole_iir_filter_ff
(
double
alpha,
unsigned
int
vlen);
75
76
public
:
77
~
gr_single_pole_iir_filter_ff
();
78
79
void
set_taps (
double
alpha);
80
81
int
work
(
int
noutput_items,
82
gr_vector_const_void_star
&input_items,
83
gr_vector_void_star
&output_items);
84
};
85
86
#endif
gnuradio-core
src
lib
filter
gr_single_pole_iir_filter_ff.h
Generated on Mon Aug 19 2013 15:37:30 for GNU Radio 3.6.5.1 C++ API by
1.8.1.2