mirror of
https://github.com/portapack-mayhem/mayhem-firmware.git
synced 2024-12-13 11:44:31 +00:00
138 lines
2.9 KiB
C++
138 lines
2.9 KiB
C++
/*
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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_modulate.hpp"
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#include "sine_table_int8.hpp"
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namespace dsp {
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namespace modulate {
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Modulator::~Modulator() {
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}
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Mode Modulator::get_mode() {
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return mode;
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}
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void Modulator::set_mode(Mode new_mode) {
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mode = new_mode;
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}
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void Modulator::set_over(uint32_t new_over) {
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over = new_over;
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}
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///
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SSB::SSB() : hilbert() {
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mode = Mode::LSB;
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}
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void SSB::execute(const buffer_s16_t& audio, const buffer_c8_t& buffer) {
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int32_t sample = 0;
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int8_t re = 0, im = 0;
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for (size_t counter = 0; counter < buffer.count; counter++) {
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if (counter % 128 == 0) {
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float i = 0.0, q = 0.0;
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sample = audio.p[counter / over] >> 2;
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//switch (mode) {
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//case Mode::LSB:
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hilbert.execute(sample / 32768.0f, i, q);
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//case Mode::USB: hilbert.execute(sample / 32768.0f, q, i);
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//default: break;
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//}
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i *= 64.0f;
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q *= 64.0f;
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switch (mode) {
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case Mode::LSB: re = q; im = i; break;
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case Mode::USB: re = i; im = q; break;
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default: re = 0; im = 0; break;
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}
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//re = q;
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//im = i;
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//break;
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}
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buffer.p[counter] = { re, im };
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}
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}
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///
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FM::FM() {
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mode = Mode::FM;
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}
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void FM::set_fm_delta(uint32_t new_delta) {
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fm_delta = new_delta;
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}
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void FM::execute(const buffer_s16_t& audio, const buffer_c8_t& buffer) {
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int32_t sample = 0;
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int8_t re, im;
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for (size_t counter = 0; counter < buffer.count; counter++) {
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if (counter % over == 0) {
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sample = audio.p[counter / over] >> 8;
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delta = sample * fm_delta;
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}
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phase += delta;
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sphase = phase >> 24;
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re = (sine_table_i8[(sphase + 64) & 255]);
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im = (sine_table_i8[sphase]);
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buffer.p[counter] = { re, im };
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}
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}
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AM::AM() {
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mode = Mode::AM;
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}
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void AM::execute(const buffer_s16_t& audio, const buffer_c8_t& buffer) {
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int32_t sample = 0;
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int8_t re = 0, im = 0;
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float q = 0.0;
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for (size_t counter = 0; counter < buffer.count; counter++) {
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if (counter % 128 == 0) {
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sample = audio.p[counter / over] >> 2;
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}
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q = sample / 32768.0f;
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q *= 64.0f;
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switch (mode) {
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case Mode::AM: re = q + 20; im = q + 20; break;
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case Mode::DSB: re = q; im = q; break;
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default: break;
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}
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buffer.p[counter] = { re, im };
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}
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}
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}
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}
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