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mmse_fir_interpolator.h
Go to the documentation of this file.
/* -*- c++ -*- */
/*
* Copyright 2002,2007,2012 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* SPDX-License-Identifier: GPL-3.0-or-later
*
*/
#ifndef INCLUDED_MMSE_FIR_INTERPOLATOR_H
#define INCLUDED_MMSE_FIR_INTERPOLATOR_H
#include <gnuradio/filter/api.h>
#include <gnuradio/filter/fir_filter.h>
#include <gnuradio/gr_complex.h>
#include <vector>
namespace gr {
namespace filter {
/*!
* \brief Compute intermediate samples between signal samples x(k*Ts)
* \ingroup filter_primitive
*
* \details
* This implements a Minimum Mean Squared Error interpolator with
* 8 taps. It is suitable for signals where the bandwidth of
* interest B = 1/(4*Ts) Where Ts is the time between samples.
*
* Although mu, the fractional delay, is specified as a float, it
* is actually quantized. 0.0 <= mu <= 1.0. That is, mu is
* quantized in the interpolate method to 32nd's of a sample.
*
* For more information, in the GNU Radio source code, see:
* \li gr-filter/lib/gen_interpolator_taps/README
* \li gr-filter/lib/gen_interpolator_taps/praxis.txt
*/
template <typename sample_t>
class FILTER_API mmse_fir_interpolator
{
public:
mmse_fir_interpolator();
mmse_fir_interpolator(mmse_fir_interpolator&&) = default;
unsigned ntaps() const;
unsigned nsteps() const;
/*!
* \brief compute a single interpolated output value.
*
* \p input must have ntaps() valid entries and be 8-byte aligned.
* input[0] .. input[ntaps() - 1] are referenced to compute the output value.
* \throws std::invalid_argument if input is not 8-byte aligned.
*
* \p mu must be in the range [0, 1] and specifies the fractional delay.
*
* \returns the interpolated input value.
*/
sample_t interpolate(const sample_t input[], float mu) const;
protected:
std::vector<kernel::fir_filter<sample_t, sample_t, float>> filters;
};
} /* namespace filter */
} /* namespace gr */
#endif /* INCLUDED_MMSE_FIR_INTERPOLATOR_H */
gr::filter::mmse_fir_interpolator::mmse_fir_interpolator
mmse_fir_interpolator()
gr::filter::mmse_fir_interpolator::mmse_fir_interpolator
mmse_fir_interpolator(mmse_fir_interpolator &&)=default
gr::filter::mmse_fir_interpolator< gr_complex >::filters
std::vector< kernel::fir_filter< gr_complex, gr_complex, float > > filters
Definition mmse_fir_interpolator.h:62
gr::filter::mmse_fir_interpolator::nsteps
unsigned nsteps() const
gr::filter::mmse_fir_interpolator::interpolate
sample_t interpolate(const sample_t input[], float mu) const
compute a single interpolated output value.
gr::filter::mmse_fir_interpolator::ntaps
unsigned ntaps() const
fir_filter.h
api.h
FILTER_API
#define FILTER_API
Definition gr-filter/include/gnuradio/filter/api.h:18
gr_complex.h
gr::filter
Definition dc_blocker_cc.h:18
gr
GNU Radio logging wrapper.
Definition basic_block.h:29