portapack-mayhem/firmware/common/ais_baseband.hpp
2016-08-29 20:47:37 -07:00

48 lines
1.4 KiB
C++

/*
* Copyright (C) 2015 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 __AIS_BASEBAND_H__
#define __AIS_BASEBAND_H__
#include <cstdint>
#include <cstddef>
#include <complex>
#include <array>
#include <bitset>
#include <utility>
namespace baseband {
namespace ais {
// Translate+Rectangular window filter
// sample=38.4k, deviation=2400, symbol=9600
// Length: 4 taps, 1 symbol, 1/4 cycle of sinusoid
// Gain: 1.0 (sinusoid / len(taps))
constexpr std::array<std::complex<float>, 4> square_taps_38k4_1t_p { {
{ 0.25000000f, 0.00000000f }, { 0.23096988f, 0.09567086f },
{ 0.17677670f, 0.17677670f }, { 0.09567086f, 0.23096988f },
} };
} /* namespace ais */
} /* namespace baseband */
#endif/*__AIS_BASEBAND_H__*/