mirror of
https://github.com/portapack-mayhem/mayhem-firmware.git
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56 lines
2.1 KiB
C++
56 lines
2.1 KiB
C++
/*
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* Copyright (C) 2015 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 __AIS_BASEBAND_H__
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#define __AIS_BASEBAND_H__
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#include <cstdint>
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#include <cstddef>
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#include <complex>
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#include <array>
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#include <bitset>
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#include <utility>
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namespace baseband {
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namespace ais {
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// RRC length should be about 4 x the symbol length (4T) to do a good job of
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// cleaning up ISI.
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// Translate+RRC filter
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// sample=38.4k, deviation=2400, b=0.5, symbol=9600
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// Length: 16 taps, 4 symbols, 1 cycles of sinusoid
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constexpr std::array<std::complex<float>, 16> rrc_taps_38k4_4t_p { {
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{ 1.0619794019e-02f, 0.0000000000e+00f }, { 3.5758705854e-03f, 1.4811740938e-03f },
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{ -1.3274742629e-02f, -1.3274742629e-02f }, { -1.5018657262e-02f, -3.6258246051e-02f },
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{ 0.0000000000e+00f, -2.6549484581e-02f }, { -1.5018657262e-02f, 3.6258246051e-02f },
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{ -1.0237997393e-01f, 1.0237997393e-01f }, { -2.2527985355e-01f, 9.3313970669e-02f },
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{ -2.8440842032e-01f, 0.0000000000e+00f }, { -2.2527985355e-01f, -9.3313970669e-02f },
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{ -1.0237997393e-01f, -1.0237997393e-01f }, { -1.5018657262e-02f, -3.6258246051e-02f },
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{ 0.0000000000e+00f, 2.6549484581e-02f }, { -1.5018657262e-02f, 3.6258246051e-02f },
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{ -1.3274742629e-02f, 1.3274742629e-02f }, { 3.5758705854e-03f, -1.4811740938e-03f },
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} };
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} /* namespace ais */
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} /* namespace baseband */
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#endif/*__AIS_BASEBAND_H__*/
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