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https://github.com/f4exb/sdrangel.git
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108 lines
3.2 KiB
C++
108 lines
3.2 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2016 Edouard Griffiths, F4EXB //
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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 as version 3 of the License, or //
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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 V3 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. If not, see <http://www.gnu.org/licenses/>. //
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///////////////////////////////////////////////////////////////////////////////////
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#include <QtGlobal>
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#include <stdio.h>
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#define _USE_MATH_DEFINES
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#include <math.h>
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#include "dsp/ncof.h"
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#undef M_PI
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#define M_PI 3.14159265358979323846
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Real NCOF::m_table[NCOF::TableSize+1];
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bool NCOF::m_tableInitialized = false;
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float NCOF::m_tableSizeLimit = (float) NCOF::TableSize;
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void NCOF::initTable()
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{
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if(m_tableInitialized) {
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return;
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}
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for(int i = 0; i <= TableSize; i++) {
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m_table[i] = cos((2.0 * M_PI * i) / TableSize);
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}
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m_tableInitialized = true;
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}
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NCOF::NCOF()
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{
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initTable();
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m_phase = 0.0f;
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m_phaseIncrement = 0.0f;
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}
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void NCOF::setFreq(Real freq, Real sampleRate)
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{
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m_phaseIncrement = (freq * TableSize) / sampleRate;
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qDebug("NCOF::setFreq: freq: %f m_phaseIncrement: %f", freq, m_phaseIncrement);
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}
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float NCOF::next()
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{
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int phase = nextPhase();
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return m_table[phase];
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}
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Complex NCOF::nextIQ()
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{
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int phase = nextPhase();
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return Complex(m_table[phase], -m_table[(phase + TableSize / 4) % TableSize]);
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}
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Complex NCOF::nextIQ(float imbalance)
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{
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int phase = nextPhase();
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int phaseQ = imbalance < 0.0 ? phase + (int) (imbalance*TableSize) : phase;
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int phaseI = imbalance < 0.0 ? phase : phase + (int) (imbalance*TableSize);
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return Complex(m_table[phaseI % TableSize], -m_table[(phaseQ + TableSize / 4) % TableSize]);
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}
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Complex NCOF::nextQI()
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{
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int phase = nextPhase();
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return Complex(-m_table[(phase + TableSize / 4) % TableSize], m_table[phase]);
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}
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float NCOF::get()
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{
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return m_table[(int) m_phase];
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}
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Complex NCOF::getIQ()
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{
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return Complex(m_table[(int) m_phase], -m_table[((int) m_phase + TableSize / 4) % TableSize]);
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}
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void NCOF::getIQ(Complex& c)
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{
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c.real(m_table[(int) m_phase]);
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c.imag(-m_table[((int) m_phase + TableSize / 4) % TableSize]);
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}
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Complex NCOF::getQI()
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{
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return Complex(-m_table[((int) m_phase + TableSize / 4) % TableSize], m_table[(int) m_phase]);
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}
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void NCOF::getQI(Complex& c)
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{
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c.imag(m_table[(int) m_phase]);
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c.real(-m_table[((int) m_phase + TableSize / 4) % TableSize]);
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}
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