git clone git://git.osmocom.org/sdrangelove.git

2026-06-03 06:24:48 -04:00 · 2014-05-18 16:52:39 +01:00
commit 7d3bfb26fc
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+///////////////////////////////////////////////////////////////////////////////////
+// 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"
+
+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 phase inc %d", m_phaseIncrement);
+}
+
+float NCO::next()
+{
+	m_phase += m_phaseIncrement;
+	while(m_phase >= TableSize)
+		m_phase -= TableSize;
+	while(m_phase < 0)
+		m_phase += TableSize;
+
+	return m_table[m_phase];
+}
+
+Complex NCO::nextIQ()
+{
+	m_phase += m_phaseIncrement;
+	while(m_phase >= TableSize)
+		m_phase -= TableSize;
+	while(m_phase < 0)
+		m_phase += TableSize;
+
+	return Complex(m_table[m_phase], -m_table[(m_phase + TableSize / 4) % TableSize]);
+}