/* * Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc. * * This file is part of PortaPack. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2, or (at your option) * any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; see the file COPYING. If not, write to * the Free Software Foundation, Inc., 51 Franklin Street, * Boston, MA 02110-1301, USA. */ #ifndef __CHANNEL_DECIMATOR_H__ #define __CHANNEL_DECIMATOR_H__ #include "buffer.hpp" #include "complex.hpp" #include "dsp_decimate.hpp" #include <array> class ChannelDecimator { public: enum class DecimationFactor { By2, By4, By8, By16, By32, }; constexpr ChannelDecimator( const DecimationFactor decimation_factor, const bool fs_over_4_downconvert = true ) : decimation_factor { decimation_factor }, fs_over_4_downconvert { fs_over_4_downconvert } { } void set_decimation_factor(const DecimationFactor f) { decimation_factor = f; } buffer_c16_t execute(const buffer_c8_t& buffer) { auto decimated = execute_decimation(buffer); return decimated; } private: std::array<complex16_t, 1024> work_baseband { }; dsp::decimate::TranslateByFSOver4AndDecimateBy2CIC3 translate { }; dsp::decimate::Complex8DecimateBy2CIC3 cic_0 { }; dsp::decimate::DecimateBy2CIC3 cic_1 { }; dsp::decimate::DecimateBy2CIC3 cic_2 { }; dsp::decimate::DecimateBy2CIC3 cic_3 { }; dsp::decimate::DecimateBy2CIC3 cic_4 { }; DecimationFactor decimation_factor { DecimationFactor::By32 }; const bool fs_over_4_downconvert { true }; buffer_c16_t execute_decimation(const buffer_c8_t& buffer); buffer_c16_t execute_stage_0( const buffer_c8_t& buffer, const buffer_c16_t& work_baseband_buffer ); }; #endif/*__CHANNEL_DECIMATOR_H__*/