mirror of https://github.com/gnss-sdr/gnss-sdr
128 lines
3.7 KiB
C++
128 lines
3.7 KiB
C++
/*!
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* \file fir_filter.h
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* \brief Adapts a gnuradio gr_fir_filter designed with pm_remez
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* \author Luis Esteve, 2012. luis(at)epsilon-formacion.com
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*
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*
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* -----------------------------------------------------------------------------
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*
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* Copyright (C) 2010-2020 (see AUTHORS file for a list of contributors)
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*
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* GNSS-SDR is a software defined Global Navigation
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* Satellite Systems receiver
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*
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* This file is part of GNSS-SDR.
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*
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* SPDX-License-Identifier: GPL-3.0-or-later
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*
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* -----------------------------------------------------------------------------
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*/
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#ifndef GNSS_SDR_FIR_FILTER_H
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#define GNSS_SDR_FIR_FILTER_H
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#include "byte_x2_to_complex_byte.h"
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#include "complex_byte_to_float_x2.h"
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#include "cshort_to_float_x2.h"
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#include "gnss_block_interface.h"
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#include "short_x2_to_cshort.h"
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#include <gnuradio/blocks/file_sink.h>
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#include <gnuradio/blocks/float_to_char.h>
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#include <gnuradio/blocks/float_to_complex.h>
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#include <gnuradio/blocks/float_to_short.h>
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#include <gnuradio/gr_complex.h>
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#ifdef GR_GREATER_38
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#include <gnuradio/filter/fir_filter_blk.h>
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#else
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#include <gnuradio/filter/fir_filter_ccf.h>
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#include <gnuradio/filter/fir_filter_fff.h>
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#endif
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#include <cmath>
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#include <string>
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#include <vector>
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/** \addtogroup Input_Filter Input Filter
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* Classes for input signal filtering
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* \{ */
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/** \addtogroup Input_filter_adapters input_filter_adapters
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* Classes that wrap GNU Radio input filters with a GNSSBlockInterface
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* \{ */
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class ConfigurationInterface;
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/*!
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* \brief This class adapts a GNU Radio gr_fir_filter designed with pm_remez
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*
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* See Parks-McClellan FIR filter design, https://en.wikipedia.org/wiki/Parks-McClellan_filter_design_algorithm
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* Calculates the optimal (in the Chebyshev/minimax sense) FIR filter impulse response
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* given a set of band edges, the desired response on those bands, and the weight given
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* to the error in those bands.
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*/
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class FirFilter : public GNSSBlockInterface
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{
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public:
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//! Constructor
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FirFilter(const ConfigurationInterface* configuration,
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std::string role,
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unsigned int in_streams,
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unsigned int out_streams);
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//! Destructor
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~FirFilter() = default;
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inline std::string role() override
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{
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return role_;
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}
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//! Returns "Fir_Filter"
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inline std::string implementation() override
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{
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return "Fir_Filter";
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}
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inline size_t item_size() override
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{
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return item_size_;
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}
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void connect(gr::top_block_sptr top_block) override;
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void disconnect(gr::top_block_sptr top_block) override;
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gr::basic_block_sptr get_left_block() override;
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gr::basic_block_sptr get_right_block() override;
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private:
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void init();
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gr::filter::fir_filter_ccf::sptr fir_filter_ccf_;
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gr::filter::fir_filter_fff::sptr fir_filter_fff_1_;
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gr::filter::fir_filter_fff::sptr fir_filter_fff_2_;
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gr::blocks::float_to_complex::sptr float_to_complex_;
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gr::blocks::float_to_short::sptr float_to_short_1_;
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gr::blocks::float_to_short::sptr float_to_short_2_;
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short_x2_to_cshort_sptr short_x2_to_cshort_;
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complex_byte_to_float_x2_sptr cbyte_to_float_x2_;
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byte_x2_to_complex_byte_sptr char_x2_cbyte_;
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cshort_to_float_x2_sptr cshort_to_float_x2_;
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gr::blocks::float_to_char::sptr float_to_char_1_;
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gr::blocks::float_to_char::sptr float_to_char_2_;
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gr::blocks::file_sink::sptr file_sink_;
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const ConfigurationInterface* config_;
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std::vector<float> taps_;
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std::string dump_filename_;
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std::string input_item_type_;
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std::string output_item_type_;
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std::string taps_item_type_;
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std::string role_;
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size_t item_size_;
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unsigned int in_streams_;
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unsigned int out_streams_;
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bool dump_;
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};
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/** \} */
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/** \} */
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#endif // GNSS_SDR_FIR_FILTER_H
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