GNU Radio C++ API Reference g90d26cb
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mmse_fir_interpolator.h
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1/* -*- c++ -*- */
2/*
3 * Copyright 2002,2007,2012 Free Software Foundation, Inc.
4 *
5 * This file is part of GNU Radio
6 *
7 * SPDX-License-Identifier: GPL-3.0-or-later
8 *
9 */
10#ifndef INCLUDED_MMSE_FIR_INTERPOLATOR_H
11#define INCLUDED_MMSE_FIR_INTERPOLATOR_H
12
13#include <gnuradio/filter/api.h>
15#include <gnuradio/gr_complex.h>
16#include <vector>
17
18namespace gr {
19namespace filter {
20
21/*!
22 * \brief Compute intermediate samples between signal samples x(k*Ts)
23 * \ingroup filter_primitive
24 *
25 * \details
26 * This implements a Minimum Mean Squared Error interpolator with
27 * 8 taps. It is suitable for signals where the bandwidth of
28 * interest B = 1/(4*Ts) Where Ts is the time between samples.
29 *
30 * Although mu, the fractional delay, is specified as a float, it
31 * is actually quantized. 0.0 <= mu <= 1.0. That is, mu is
32 * quantized in the interpolate method to 32nd's of a sample.
33 *
34 * For more information, in the GNU Radio source code, see:
35 * \li gr-filter/lib/gen_interpolator_taps/README
36 * \li gr-filter/lib/gen_interpolator_taps/praxis.txt
37 */
38template <typename sample_t>
40{
41public:
44
45 unsigned ntaps() const;
46 unsigned nsteps() const;
47
48 /*!
49 * \brief compute a single interpolated output value.
50 *
51 * \p input must have ntaps() valid entries and be 8-byte aligned.
52 * input[0] .. input[ntaps() - 1] are referenced to compute the output value.
53 * \throws std::invalid_argument if input is not 8-byte aligned.
54 *
55 * \p mu must be in the range [0, 1] and specifies the fractional delay.
56 *
57 * \returns the interpolated input value.
58 */
59 sample_t interpolate(const sample_t input[], float mu) const;
60
61protected:
63};
64
65} /* namespace filter */
66} /* namespace gr */
67
68#endif /* INCLUDED_MMSE_FIR_INTERPOLATOR_H */
Compute intermediate samples between signal samples x(k*Ts)
Definition mmse_fir_interpolator.h:40
mmse_fir_interpolator(mmse_fir_interpolator &&)=default
std::vector< kernel::fir_filter< sample_t, sample_t, float > > filters
Definition mmse_fir_interpolator.h:62
sample_t interpolate(const sample_t input[], float mu) const
compute a single interpolated output value.
STL class.
Definition vector_docstub.h:11
#define FILTER_API
Definition gr-filter/include/gnuradio/filter/api.h:18
GNU Radio logging wrapper.
Definition basic_block.h:29