mirror of
https://github.com/portapack-mayhem/mayhem-firmware.git
synced 2024-12-15 04:28:10 +00:00
67 lines
1.6 KiB
C++
67 lines
1.6 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 __DSP_DEMODULATE_H__
|
|
#define __DSP_DEMODULATE_H__
|
|
|
|
#include "dsp_types.hpp"
|
|
|
|
namespace dsp {
|
|
namespace demodulate {
|
|
|
|
class AM {
|
|
public:
|
|
buffer_s16_t execute(
|
|
buffer_c16_t src,
|
|
buffer_s16_t dst
|
|
);
|
|
};
|
|
|
|
class FM {
|
|
public:
|
|
/*
|
|
* angle: -pi to pi. output range: -32768 to 32767.
|
|
* Maximum delta-theta (output of atan2) at maximum deviation frequency:
|
|
* delta_theta_max = 2 * pi * deviation / sampling_rate
|
|
*/
|
|
constexpr FM(
|
|
const float sampling_rate,
|
|
const float deviation_hz
|
|
) : z_ { 0 },
|
|
k { static_cast<float>(32767.0f / (2.0 * pi * deviation_hz / sampling_rate)) }
|
|
{
|
|
}
|
|
|
|
buffer_s16_t execute(
|
|
buffer_c16_t src,
|
|
buffer_s16_t dst
|
|
);
|
|
|
|
private:
|
|
complex16_t::rep_type z_;
|
|
const float k;
|
|
};
|
|
|
|
} /* namespace demodulate */
|
|
} /* namespace dsp */
|
|
|
|
#endif/*__DSP_DEMODULATE_H__*/
|