mirror of https://github.com/gnss-sdr/gnss-sdr
109 lines
3.6 KiB
C++
109 lines
3.6 KiB
C++
/*!
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* \file freq_xlating_fir_filter.h
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* \brief Adapts a gnuradio gr_freq_xlating_fir_filter designed with gr_remez
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* \author Luis Esteve, 2012. luis(at)epsilon-formacion.com
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*
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* Detailed description of the file here if needed.
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*
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* -------------------------------------------------------------------------
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*
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* Copyright (C) 2010-2014 (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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* GNSS-SDR 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 of the License, or
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* at your option) any later version.
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*
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* GNSS-SDR 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 GNSS-SDR. If not, see <http://www.gnu.org/licenses/>.
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*
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* -------------------------------------------------------------------------
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*/
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#ifndef GNSS_SDR_FREQ_XLATING_FIR_FILTER_H_
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#define GNSS_SDR_FREQ_XLATING_FIR_FILTER_H_
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#include <string>
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#include <vector>
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#include <gnuradio/filter/freq_xlating_fir_filter_ccf.h>
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#include <gnuradio/filter/freq_xlating_fir_filter_fcf.h>
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#include <gnuradio/blocks/file_sink.h>
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#include <gnuradio/msg_queue.h>
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#include "gnss_synchro.h"
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#include "gnss_block_interface.h"
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class ConfigurationInterface;
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/*!
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* \brief This class adapts a gnuradio gr_freq_xlating_fir_filter designed with pm_remez
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*
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* Construct a FIR filter with the given taps and a composite frequency
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* translation that shifts intermediate_freq_ down to zero Hz. The frequency
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* translation logically comes before the filtering operation.
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*
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* See Parks-McClellan FIR filter design, http://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 FreqXlatingFirFilter: public GNSSBlockInterface
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{
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public:
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FreqXlatingFirFilter(ConfigurationInterface* configuration,
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std::string role, unsigned int in_streams,
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unsigned int out_streams, boost::shared_ptr<gr::msg_queue> queue);
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virtual ~FreqXlatingFirFilter();
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std::string role()
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{
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return role_;
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}
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//! Returns "Freq_Xlating_Fir_Filter"
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std::string implementation()
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{
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return "Freq_Xlating_Fir_Filter";
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}
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size_t item_size()
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{
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return 0;
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}
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void connect(gr::top_block_sptr top_block);
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void disconnect(gr::top_block_sptr top_block);
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gr::basic_block_sptr get_left_block();
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gr::basic_block_sptr get_right_block();
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private:
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gr::filter::freq_xlating_fir_filter_ccf::sptr freq_xlating_fir_filter_ccf_;
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gr::filter::freq_xlating_fir_filter_fcf::sptr freq_xlating_fir_filter_fcf_;
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ConfigurationInterface* config_;
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bool dump_;
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std::string dump_filename_;
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std::string input_item_type_;
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size_t input_size_;
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std::string output_item_type_;
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std::string taps_item_type_;
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std::vector <float> taps_;
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double intermediate_freq_;
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double sampling_freq_;
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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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boost::shared_ptr<gr::msg_queue> queue_;
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gr::blocks::file_sink::sptr file_sink_;
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void init();
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};
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#endif // GNSS_SDR_FREQ_XLATING_FIR_FILTER_H_
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