58 lines
1.5 KiB
C++
58 lines
1.5 KiB
C++
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/*
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* Copyright (C) 2020 Belousov Oleg
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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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#include "dsp_hilbert.hpp"
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#include "dsp_sos_config.hpp"
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namespace dsp {
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HilbertTransform::HilbertTransform() {
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n = 0;
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sos_i.configure(half_band_lpf_config);
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sos_q.configure(half_band_lpf_config);
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}
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void HilbertTransform::execute(float in, float &out_i, float &out_q) {
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float a = 0, b = 0;
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switch (n) {
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case 0: a = in; b = 0; break;
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case 1: a = 0; b = -in; break;
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case 2: a = -in; b = 0; break;
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case 3: a = 0; b = in; break;
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}
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float i = sos_i.execute(a) * 2.0f;
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float q = sos_q.execute(b) * 2.0f;
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switch (n) {
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case 0: out_i = i; out_q = q; break;
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case 1: out_i = -q; out_q = i; break;
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case 2: out_i = -i; out_q = -q; break;
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case 3: out_i = q; out_q = -i; break;
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}
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n = (n + 1) % 4;
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}
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} /* namespace dsp */
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