portapack-mayhem/firmware/baseband/channel_decimator.hpp

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/*
* 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(
) : decimation_factor { DecimationFactor::By32 },
fs_over_4_downconvert { true }
{
}
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;
const bool fs_over_4_downconvert;
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__*/