portapack-mayhem/firmware/baseband/channel_decimator.hpp
2015-08-27 09:49:14 -07:00

84 lines
2.0 KiB
C++

/*
* 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 {
By4,
By8,
By16,
By32,
};
ChannelDecimator(
DecimationFactor f
) : decimation_factor { f }
{
}
void set_decimation_factor(const DecimationFactor f) {
decimation_factor = f;
}
buffer_c16_t execute(buffer_c8_t buffer) {
auto decimated = execute_decimation(buffer);
return decimated;
}
private:
std::array<complex16_t, 1024> work_baseband;
const buffer_c16_t work_baseband_buffer {
work_baseband.data(),
work_baseband.size()
};
const buffer_s16_t work_audio_buffer {
(int16_t*)work_baseband.data(),
sizeof(work_baseband) / sizeof(int16_t)
};
//const bool fs_over_4_downconvert = true;
dsp::decimate::TranslateByFSOver4AndDecimateBy2CIC3 translate;
//dsp::decimate::DecimateBy2CIC3 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 };
buffer_c16_t execute_decimation(buffer_c8_t buffer);
};
#endif/*__CHANNEL_DECIMATOR_H__*/