GNU Radio C++ API
gr_single_pole_iir_filter_ff.h
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/* -*- c++ -*- */
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/*
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* Copyright 2004,2005 Free Software Foundation, Inc.
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*
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* This file is part of GNU Radio
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*
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* GNU Radio is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3, or (at your option)
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* any later version.
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*
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* GNU Radio is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU Radio; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef INCLUDED_GR_SINGLE_POLE_IIR_FILTER_FF_H
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#define INCLUDED_GR_SINGLE_POLE_IIR_FILTER_FF_H
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#include <
gr_core_api.h
>
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#include <
gr_sync_block.h
>
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#include <
gr_single_pole_iir.h
>
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#include <stdexcept>
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class
gr_single_pole_iir_filter_ff
;
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typedef
boost::shared_ptr<gr_single_pole_iir_filter_ff>
gr_single_pole_iir_filter_ff_sptr
;
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GR_CORE_API
gr_single_pole_iir_filter_ff_sptr
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gr_make_single_pole_iir_filter_ff
(
double
alpha,
unsigned
int
vlen=1);
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/*!
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* \brief single pole IIR filter with float input, float output
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* \ingroup filter_blk
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*
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* The input and output satisfy a difference equation of the form
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\f[
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y[n] - (1-alpha) y[n-1] = alpha x[n]
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\f]
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* with the corresponding rational system function
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\f[
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H(z) = \frac{alpha}{1 - (1-alpha) z^{-1}}
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\f]
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* Note that some texts define the system function with a + in the denominator.
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* If you're using that convention, you'll need to negate the feedback tap.
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*/
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class
GR_CORE_API
gr_single_pole_iir_filter_ff
:
public
gr_sync_block
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{
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private
:
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friend
GR_CORE_API
gr_single_pole_iir_filter_ff_sptr
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gr_make_single_pole_iir_filter_ff
(
double
alpha,
unsigned
int
vlen);
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unsigned
int
d_vlen;
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std::vector<gr_single_pole_iir<float,float,double> > d_iir;
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gr_single_pole_iir_filter_ff
(
double
alpha,
unsigned
int
vlen);
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public
:
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~
gr_single_pole_iir_filter_ff
();
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void
set_taps (
double
alpha);
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int
work
(
int
noutput_items,
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gr_vector_const_void_star
&input_items,
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gr_vector_void_star
&output_items);
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};
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#endif
gnuradio-core
src
lib
filter
gr_single_pole_iir_filter_ff.h
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