gr-baz Package
mmse_fir_interpolator_ff.h
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/* -*- c++ -*- */
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/*
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* Copyright 2002,2012 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 _MMSE_FIR_INTERPOLATOR_FF_H_
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#define _MMSE_FIR_INTERPOLATOR_FF_H_
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#include <
filter/api.h
>
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#include <
filter/fir_filter.h
>
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#include <vector>
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namespace
gr {
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namespace
filter {
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/*!
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* \brief Compute intermediate samples between signal samples x(k*Ts)
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* \ingroup filter_primitive
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*
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* This implements a Mininum Mean Squared Error interpolator with
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* 8 taps. It is suitable for signals where the bandwidth of
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* interest B = 1/(4*Ts) Where Ts is the time between samples.
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*
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* Although mu, the fractional delay, is specified as a float, it
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* is actually quantized. 0.0 <= mu <= 1.0. That is, mu is
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* quantized in the interpolate method to 32nd's of a sample.
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*
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* For more information, in the GNU Radio source code, see:
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* \li gnuradio-core/src/gen_interpolator_taps/README
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* \li gnuradio-core/src/gen_interpolator_taps/praxis.txt
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*/
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class
FILTER_API
mmse_fir_interpolator_ff
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{
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public
:
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mmse_fir_interpolator_ff
();
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~
mmse_fir_interpolator_ff
();
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unsigned
ntaps()
const
;
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unsigned
nsteps()
const
;
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/*!
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* \brief compute a single interpolated output value.
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* \p input must have ntaps() valid entries.
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* input[0] .. input[ntaps() - 1] are referenced to compute the output value.
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*
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* \p mu must be in the range [0, 1] and specifies the fractional delay.
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*
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* \returns the interpolated input value.
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*/
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float
interpolate
(
const
float
input[],
float
mu)
const
;
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protected
:
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std::vector<kernel::fir_filter_fff*>
filters
;
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};
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}
/* namespace filter */
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}
/* namespace gr */
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#endif
/* _MMSE_FIR_INTERPOLATOR_FF_H_ */
gnuradio
gr-filter
include
filter
mmse_fir_interpolator_ff.h
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