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fft_filter_fff.h
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/* -*- c++ -*- */
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/*
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* Copyright 2005,2012 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_FILTER_FFT_FILTER_FFF_H
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#define INCLUDED_FILTER_FFT_FILTER_FFF_H
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#include <
gnuradio/filter/api.h
>
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#include <
gnuradio/sync_decimator.h
>
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namespace
gr {
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namespace
filter {
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/*!
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* \brief Fast FFT filter with float input, float output and float taps
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* \ingroup filter_blk
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*
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* \details
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* This block implements a real-value decimating filter using the
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* fast convolution method via an FFT. The decimation factor is an
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* interger that is greater than or equal to 1.
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*
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* The filter takes a set of real-valued taps to use in the
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* filtering operation. These taps can be defined as anything that
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* satisfies the user's filtering needs. For standard filters such
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* as lowpass, highpass, bandpass, etc., the filter.firdes and
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* filter.optfir classes provide convenient generating methods.
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*
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* This filter is implemented by using the FFTW package to perform
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* the required FFTs. An optional argument, nthreads, may be
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* passed to the constructor (or set using the set_nthreads member
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* function) to split the FFT among N number of threads. This can
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* improve performance on very large FFTs (that is, if the number
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* of taps used is very large) if you have enough threads/cores to
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* support it.
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*/
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class
FILTER_API
fft_filter_fff
:
virtual
public
sync_decimator
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{
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public
:
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// gr::filter::fft_filter_fff::sptr
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typedef
boost::shared_ptr<fft_filter_fff>
sptr
;
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/*!
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* Build an FFT filter block.
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*
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* \param decimation >= 1
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* \param taps float filter taps
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* \param nthreads number of threads for the FFT to use
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*/
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static
sptr
make(
int
decimation,
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const
std::vector<float> &
taps
,
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int
nthreads=1);
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virtual
void
set_taps(
const
std::vector<float> &
taps
) = 0;
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virtual
std::vector<float>
taps
()
const
= 0;
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/*!
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* \brief Set number of threads to use.
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*/
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virtual
void
set_nthreads(
int
n) = 0;
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/*!
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* \brief Get number of threads being used.
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*/
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virtual
int
nthreads()
const
= 0;
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};
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}
/* namespace filter */
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}
/* namespace gr */
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#endif
/* INCLUDED_FILTER_FFT_FILTER_FFF_H */
gr-filter
include
gnuradio
filter
fft_filter_fff.h
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