mirror of
https://github.com/portapack-mayhem/mayhem-firmware.git
synced 2024-12-13 11:44:31 +00:00
58 lines
1.5 KiB
C++
58 lines
1.5 KiB
C++
/*
|
|
* Copyright (C) 2020 Belousov Oleg
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#include "dsp_hilbert.hpp"
|
|
#include "dsp_sos_config.hpp"
|
|
|
|
namespace dsp {
|
|
|
|
HilbertTransform::HilbertTransform() {
|
|
n = 0;
|
|
|
|
sos_i.configure(half_band_lpf_config);
|
|
sos_q.configure(half_band_lpf_config);
|
|
}
|
|
|
|
void HilbertTransform::execute(float in, float &out_i, float &out_q) {
|
|
float a = 0, b = 0;
|
|
|
|
switch (n) {
|
|
case 0: a = in; b = 0; break;
|
|
case 1: a = 0; b = -in; break;
|
|
case 2: a = -in; b = 0; break;
|
|
case 3: a = 0; b = in; break;
|
|
}
|
|
|
|
float i = sos_i.execute(a) * 2.0f;
|
|
float q = sos_q.execute(b) * 2.0f;
|
|
|
|
switch (n) {
|
|
case 0: out_i = i; out_q = q; break;
|
|
case 1: out_i = -q; out_q = i; break;
|
|
case 2: out_i = -i; out_q = -q; break;
|
|
case 3: out_i = q; out_q = -i; break;
|
|
}
|
|
|
|
n = (n + 1) % 4;
|
|
}
|
|
|
|
} /* namespace dsp */
|