82 lines
2.1 KiB
C++
82 lines
2.1 KiB
C++
/*
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* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
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*
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* This file is part of PortaPack.
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*
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* This program 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 2, or (at your option)
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* any later version.
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*
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* This program 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 this program; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef __CHANNEL_DECIMATOR_H__
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#define __CHANNEL_DECIMATOR_H__
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#include "buffer.hpp"
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#include "complex.hpp"
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#include "dsp_decimate.hpp"
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#include <array>
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class ChannelDecimator {
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public:
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enum class DecimationFactor {
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By2,
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By4,
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By8,
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By16,
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By32,
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};
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constexpr ChannelDecimator(
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const DecimationFactor decimation_factor,
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const bool fs_over_4_downconvert = true
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) : decimation_factor { decimation_factor },
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fs_over_4_downconvert { fs_over_4_downconvert }
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{
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}
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void set_decimation_factor(const DecimationFactor f) {
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decimation_factor = f;
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}
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buffer_c16_t execute(const buffer_c8_t& buffer) {
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auto decimated = execute_decimation(buffer);
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return decimated;
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}
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private:
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std::array<complex16_t, 1024> work_baseband { };
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dsp::decimate::TranslateByFSOver4AndDecimateBy2CIC3 translate { };
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dsp::decimate::Complex8DecimateBy2CIC3 cic_0 { };
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dsp::decimate::DecimateBy2CIC3 cic_1 { };
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dsp::decimate::DecimateBy2CIC3 cic_2 { };
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dsp::decimate::DecimateBy2CIC3 cic_3 { };
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dsp::decimate::DecimateBy2CIC3 cic_4 { };
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DecimationFactor decimation_factor { DecimationFactor::By32 };
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const bool fs_over_4_downconvert { true };
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buffer_c16_t execute_decimation(const buffer_c8_t& buffer);
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buffer_c16_t execute_stage_0(
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const buffer_c8_t& buffer,
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const buffer_c16_t& work_baseband_buffer
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);
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};
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#endif/*__CHANNEL_DECIMATOR_H__*/
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