mirror of
https://github.com/f4exb/sdrangel.git
synced 2024-11-09 01:56:05 -05:00
108 lines
2.9 KiB
C++
108 lines
2.9 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
|
|
// Copyright (C) 2012 maintech GmbH, Otto-Hahn-Str. 15, 97204 Hoechberg, Germany //
|
|
// written by Christian Daniel //
|
|
// //
|
|
// 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 as version 3 of the License, or //
|
|
// //
|
|
// 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 V3 for more details. //
|
|
// //
|
|
// You should have received a copy of the GNU General Public License //
|
|
// along with this program. If not, see <http://www.gnu.org/licenses/>. //
|
|
///////////////////////////////////////////////////////////////////////////////////
|
|
|
|
#include <QtGlobal>
|
|
#include <stdio.h>
|
|
#define _USE_MATH_DEFINES
|
|
#include <math.h>
|
|
#include "dsp/nco.h"
|
|
|
|
#undef M_PI
|
|
#define M_PI 3.14159265358979323846
|
|
|
|
Real NCO::m_table[NCO::TableSize];
|
|
bool NCO::m_tableInitialized = false;
|
|
|
|
void NCO::initTable()
|
|
{
|
|
if(m_tableInitialized)
|
|
return;
|
|
|
|
for(int i = 0; i < TableSize; i++)
|
|
m_table[i] = cos((2.0 * M_PI * i) / TableSize);
|
|
|
|
m_tableInitialized = true;
|
|
}
|
|
|
|
NCO::NCO()
|
|
{
|
|
initTable();
|
|
m_phase = 0;
|
|
}
|
|
|
|
void NCO::setFreq(Real freq, Real sampleRate)
|
|
{
|
|
m_phaseIncrement = (freq * TableSize) / sampleRate;
|
|
qDebug("NCO freq: %f phase inc %d", freq, m_phaseIncrement);
|
|
}
|
|
|
|
float NCO::next()
|
|
{
|
|
nextPhase();
|
|
return m_table[m_phase];
|
|
}
|
|
|
|
Complex NCO::nextIQ()
|
|
{
|
|
nextPhase();
|
|
return Complex(m_table[m_phase], -m_table[(m_phase + TableSize / 4) % TableSize]);
|
|
}
|
|
|
|
Complex NCO::nextQI()
|
|
{
|
|
nextPhase();
|
|
return Complex(-m_table[(m_phase + TableSize / 4) % TableSize], m_table[m_phase]);
|
|
}
|
|
|
|
void NCO::nextIQMul(Real& i, Real& q)
|
|
{
|
|
nextPhase();
|
|
Real x = i;
|
|
Real y = q;
|
|
const Real& u = m_table[m_phase];
|
|
const Real& v = -m_table[(m_phase + TableSize / 4) % TableSize];
|
|
i = x*u - y*v;
|
|
q = x*v + y*u;
|
|
}
|
|
|
|
float NCO::get()
|
|
{
|
|
return m_table[m_phase];
|
|
}
|
|
|
|
Complex NCO::getIQ()
|
|
{
|
|
return Complex(m_table[m_phase], -m_table[(m_phase + TableSize / 4) % TableSize]);
|
|
}
|
|
|
|
void NCO::getIQ(Complex& c)
|
|
{
|
|
c.real(m_table[m_phase]);
|
|
c.imag(-m_table[(m_phase + TableSize / 4) % TableSize]);
|
|
}
|
|
|
|
Complex NCO::getQI()
|
|
{
|
|
return Complex(-m_table[(m_phase + TableSize / 4) % TableSize], m_table[m_phase]);
|
|
}
|
|
|
|
void NCO::getQI(Complex& c)
|
|
{
|
|
c.imag(m_table[m_phase]);
|
|
c.real(-m_table[(m_phase + TableSize / 4) % TableSize]);
|
|
}
|