gr-baz Package
gr_single_pole_iir_filter_cc.h
Go to the documentation of this file.
1
/* -*- c++ -*- */
2
/*
3
* Copyright 2004,2005,2006 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_CC_H
24
#define INCLUDED_GR_SINGLE_POLE_IIR_FILTER_CC_H
25
26
#include <
gr_core_api.h
>
27
#include <
gr_sync_block.h
>
28
#include <
gr_single_pole_iir.h
>
29
#include <
gr_complex.h
>
30
#include <stdexcept>
31
32
class
gr_single_pole_iir_filter_cc
;
33
typedef
boost::shared_ptr<gr_single_pole_iir_filter_cc>
gr_single_pole_iir_filter_cc_sptr
;
34
35
GR_CORE_API
gr_single_pole_iir_filter_cc_sptr
36
gr_make_single_pole_iir_filter_cc
(
double
alpha,
unsigned
int
vlen=1);
37
38
/*!
39
* \brief single pole IIR filter with complex input, complex output
40
* \ingroup filter_blk
41
*
42
* The input and output satisfy a difference equation of the form
43
\htmlonly
44
\f{
45
y[n] - (1-alpha) y[n-1] = alpha x[n]
46
\f}
47
\endhtmlonly
48
49
\xmlonly
50
y[n] - (1-alpha) y[n-1] = alpha x[n]
51
\endxmlonly
52
53
* with the corresponding rational system function
54
\htmlonly
55
\f{
56
H(z) = \frac{alpha}{1 - (1-alpha) z^{-1}}
57
\f}
58
\endhtmlonly
59
60
\xmlonly
61
H(z) = \ frac{alpha}{1 - (1-alpha) z^{-1}}
62
\endxmlonly
63
64
* Note that some texts define the system function with a + in the denominator.
65
* If you're using that convention, you'll need to negate the feedback tap.
66
*/
67
class
GR_CORE_API
gr_single_pole_iir_filter_cc
:
public
gr_sync_block
68
{
69
private
:
70
friend
GR_CORE_API
gr_single_pole_iir_filter_cc_sptr
71
gr_make_single_pole_iir_filter_cc
(
double
alpha,
unsigned
int
vlen);
72
73
unsigned
int
d_vlen;
74
std::vector<gr_single_pole_iir<gr_complex,gr_complex,double> > d_iir;
75
76
gr_single_pole_iir_filter_cc
(
double
alpha,
unsigned
int
vlen);
77
78
public
:
79
~
gr_single_pole_iir_filter_cc
();
80
81
void
set_taps (
double
alpha);
82
83
int
work
(
int
noutput_items,
84
gr_vector_const_void_star
&input_items,
85
gr_vector_void_star
&output_items);
86
};
87
88
#endif
gnuradio
gnuradio-core
src
lib
filter
gr_single_pole_iir_filter_cc.h
Generated by
1.8.1.2