GNU Radio Manual and C++ API Reference 3.8.5.0
The Free & Open Software Radio Ecosystem
 
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mmse_fir_interpolator_cc.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 * GNU Radio is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 3, or (at your option)
10 * any later version.
11 *
12 * GNU Radio is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with GNU Radio; see the file COPYING. If not, write to
19 * the Free Software Foundation, Inc., 51 Franklin Street,
20 * Boston, MA 02110-1301, USA.
21 */
22#ifndef _GRI_MMSE_FIR_INTERPOLATOR_CC_H_
23#define _GRI_MMSE_FIR_INTERPOLATOR_CC_H_
24
25#include <gnuradio/filter/api.h>
27#include <gnuradio/gr_complex.h>
28#include <vector>
29
30namespace gr {
31namespace filter {
32
33/*!
34 * \brief Compute intermediate samples between signal samples x(k*Ts)
35 * \ingroup filter_primitive
36 *
37 * \details
38 * This implements a Minimum Mean Squared Error interpolator with
39 * 8 taps. It is suitable for signals where the bandwidth of
40 * interest B = 1/(4*Ts) Where Ts is the time between samples.
41 *
42 * Although mu, the fractional delay, is specified as a float, it
43 * is actually quantized. 0.0 <= mu <= 1.0. That is, mu is
44 * quantized in the interpolate method to 32nd's of a sample.
45 *
46 * For more information, in the GNU Radio source code, see:
47 * \li gr-filter/lib/gen_interpolator_taps/README
48 * \li gr-filter/lib/gen_interpolator_taps/praxis.txt
49 */
51{
52public:
55
56 unsigned ntaps() const;
57 unsigned nsteps() const;
58
59 /*!
60 * \brief compute a single interpolated output value.
61 *
62 * \p input must have ntaps() valid entries and be 8-byte aligned.
63 * input[0] .. input[ntaps() - 1] are referenced to compute the output value.
64 * \throws std::invalid_argument if input is not 8-byte aligned.
65 *
66 * \p mu must be in the range [0, 1] and specifies the fractional delay.
67 *
68 * \returns the interpolated input value.
69 */
70 gr_complex interpolate(const gr_complex input[], float mu) const;
71
72protected:
73 std::vector<kernel::fir_filter_ccf*> filters;
74};
75
76} /* namespace filter */
77} /* namespace gr */
78
79#endif /* _MMSE_FIR_INTERPOLATOR_CC_H_ */
Compute intermediate samples between signal samples x(k*Ts)
Definition mmse_fir_interpolator_cc.h:51
std::vector< kernel::fir_filter_ccf * > filters
Definition mmse_fir_interpolator_cc.h:73
gr_complex interpolate(const gr_complex input[], float mu) const
compute a single interpolated output value.
#define FILTER_API
Definition gr-filter/include/gnuradio/filter/api.h:30
std::complex< float > gr_complex
Definition gr_complex.h:27
GNU Radio logging wrapper for log4cpp library (C++ port of log4j)
Definition basic_block.h:46