NCOF Class Reference

#include <ncof.h>

Public Member Functions
	NCOF ()
void	setFreq (Real freq, Real sampleRate)
void	setPhase (Real phase)
int	nextPhase ()
Real	next ()
	Return next real sample. More...
Complex	nextIQ ()
	Return next complex sample. More...
Complex	nextIQ (float imbalance)
	Return next complex sample with an imbalance factor on I. More...
Complex	nextQI ()
	Return next complex sample (reversed) More...
Real	get ()
	Return current real sample (no phase increment) More...
Complex	getIQ ()
	Return current complex sample (no phase increment) More...
void	getIQ (Complex &c)
	Sets to the current complex sample (no phase increment) More...
Complex	getQI ()
	Return current complex sample (no phase increment, reversed) More...
void	getQI (Complex &c)
	Sets to the current complex sample (no phase increment, reversed) More...

Private Types
enum	{ TableSize = (1 << 12) }

Static Private Member Functions
static void	initTable ()

Private Attributes
Real	m_phaseIncrement
Real	m_phase

Static Private Attributes
static Real	m_table [TableSize+1]
static bool	m_tableInitialized = false
static float	m_tableSizeLimit = (float) NCOF::TableSize

Detailed Description

Definition at line 24 of file ncof.h.

Member Enumeration Documentation

anonymous enum

anonymous enum

private

Enumerator
TableSize

Definition at line 26 of file ncof.h.

         {
        TableSize = (1 << 12),
    };

Constructor & Destructor Documentation

NCOF()

NCOF::NCOF

(

)

Definition at line 44 of file ncof.cpp.

References initTable(), m_phase, and m_phaseIncrement.

{
    initTable();
    m_phase = 0.0f;
    m_phaseIncrement = 0.0f;
}

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Member Function Documentation

get()

float NCOF::get

(

)

Return current real sample (no phase increment)

Definition at line 83 of file ncof.cpp.

References m_phase, and m_table.

{
    return m_table[(int) m_phase];
}

getIQ() [1/2]

Complex NCOF::getIQ

(

)

Return current complex sample (no phase increment)

Definition at line 88 of file ncof.cpp.

References m_phase, m_table, and TableSize.

{
    return Complex(m_table[(int) m_phase], -m_table[((int) m_phase + TableSize / 4) % TableSize]);
}

getIQ() [2/2]

void NCOF::getIQ

(

Complex &

c

)

Sets to the current complex sample (no phase increment)

Definition at line 93 of file ncof.cpp.

References m_phase, m_table, and TableSize.

{
    c.real(m_table[(int) m_phase]);
    c.imag(-m_table[((int) m_phase + TableSize / 4) % TableSize]);
}

getQI() [1/2]

Complex NCOF::getQI

(

)

Return current complex sample (no phase increment, reversed)

Definition at line 99 of file ncof.cpp.

References m_phase, m_table, and TableSize.

{
    return Complex(-m_table[((int) m_phase + TableSize / 4) % TableSize], m_table[(int) m_phase]);
}

getQI() [2/2]

void NCOF::getQI

(

Complex &

c

)

Sets to the current complex sample (no phase increment, reversed)

Definition at line 104 of file ncof.cpp.

References m_phase, m_table, and TableSize.

{
    c.imag(m_table[(int) m_phase]);
    c.real(-m_table[((int) m_phase + TableSize / 4) % TableSize]);
}

initTable()

void NCOF::initTable ( )

staticprivate

Definition at line 31 of file ncof.cpp.

References cos(), i, M_PI, m_table, m_tableInitialized, and TableSize.

Referenced by NCOF().

{
    if(m_tableInitialized) {
        return;
    }

    for(int i = 0; i <= TableSize; i++) {
        m_table[i] = cos((2.0 * M_PI * i) / TableSize);
    }

    m_tableInitialized = true;
}

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next()

float NCOF::next

(

)

Return next real sample.

Definition at line 57 of file ncof.cpp.

References m_table, and nextPhase().

Referenced by NFMMod::modulateSample(), TestMIThread::pullAF(), TestSourceThread::pullAF(), WFMMod::pullAF(), AMMod::pullAF(), NFMMod::pullAF(), FreeDVMod::pullAF(), and SSBMod::pullAF().

{
    int phase = nextPhase();
    return m_table[phase];
}

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nextIQ() [1/2]

Complex NCOF::nextIQ

(

)

Return next complex sample.

Definition at line 63 of file ncof.cpp.

References m_table, nextPhase(), and TableSize.

Referenced by SSBDemod::feed(), FreqTracker::feed(), FreeDVDemod::feed(), ChannelAnalyzer::feed(), TestMIThread::generate(), TestSourceThread::generate(), SSBMod::pull(), FreeDVMod::pull(), and SSBMod::pullAF().

{
    int phase = nextPhase();
    return Complex(m_table[phase], -m_table[(phase + TableSize / 4) % TableSize]);
}

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nextIQ() [2/2]

Complex NCOF::nextIQ

(

float

imbalance

)

Return next complex sample with an imbalance factor on I.

Definition at line 69 of file ncof.cpp.

References m_table, nextPhase(), and TableSize.

{
    int phase = nextPhase();
    int phaseQ = imbalance < 0.0 ? phase + (int) (imbalance*TableSize) : phase;
    int phaseI = imbalance < 0.0 ? phase : phase + (int) (imbalance*TableSize);
    return Complex(m_table[phaseI % TableSize], -m_table[(phaseQ + TableSize / 4) % TableSize]);
}

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nextPhase()

int NCOF::nextPhase ( )

inline

Definition at line 44 of file ncof.h.

Referenced by next(), nextIQ(), and nextQI().

    {
        m_phase += m_phaseIncrement;
        while(m_phase >= m_tableSizeLimit) {
            m_phase -= TableSize;
        }
        while(m_phase < 0.0) {
            m_phase += TableSize;
        }
        return (int) m_phase;
    }

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nextQI()

Complex NCOF::nextQI

(

)

Return next complex sample (reversed)

Definition at line 77 of file ncof.cpp.

References m_table, nextPhase(), and TableSize.

Referenced by SSBMod::pullAF().

{
    int phase = nextPhase();
    return Complex(-m_table[(phase + TableSize / 4) % TableSize], m_table[phase]);
}

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setFreq()

void NCOF::setFreq	(	Real	freq,
		Real	sampleRate
	)

Definition at line 51 of file ncof.cpp.

References m_phaseIncrement, and TableSize.

Referenced by AMMod::AMMod(), AMMod::applyAudioSampleRate(), NFMMod::applyAudioSampleRate(), SSBMod::applyAudioSampleRate(), ChannelAnalyzer::applyChannelSettings(), FreqTracker::applyChannelSettings(), WFMMod::applyChannelSettings(), SSBDemod::applyChannelSettings(), FreeDVMod::applyChannelSettings(), SSBMod::applyChannelSettings(), FreeDVDemod::applyChannelSettings(), WFMMod::applySettings(), AMMod::applySettings(), NFMMod::applySettings(), FreeDVMod::applySettings(), SSBMod::applySettings(), FreeDVMod::FreeDVMod(), NFMMod::NFMMod(), TestMIThread::setFrequencyShift(), TestSourceThread::setFrequencyShift(), TestMIThread::setSamplerate(), TestSourceThread::setSamplerate(), TestMIThread::setToneFrequency(), TestSourceThread::setToneFrequency(), SSBMod::SSBMod(), and WFMMod::WFMMod().

{
    m_phaseIncrement = (freq * TableSize) / sampleRate;
    qDebug("NCOF::setFreq: freq: %f m_phaseIncrement: %f", freq, m_phaseIncrement);
}

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setPhase()

void NCOF::setPhase ( Real  phase )

inline

Definition at line 42 of file ncof.h.

Referenced by WFMMod::pullAF(), AMMod::pullAF(), NFMMod::pullAF(), FreeDVMod::pullAF(), and SSBMod::pullAF().

{ m_phase = phase; }

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Member Data Documentation

m_phase

Real NCOF::m_phase

private

Definition at line 36 of file ncof.h.

Referenced by get(), getIQ(), getQI(), and NCOF().

m_phaseIncrement

Real NCOF::m_phaseIncrement

private

Definition at line 35 of file ncof.h.

Referenced by NCOF(), and setFreq().

m_table

Real NCOF::m_table

staticprivate

Definition at line 29 of file ncof.h.

Referenced by get(), getIQ(), getQI(), initTable(), next(), nextIQ(), and nextQI().

m_tableInitialized

bool NCOF::m_tableInitialized = false

staticprivate

Definition at line 30 of file ncof.h.

Referenced by initTable().

m_tableSizeLimit

float NCOF::m_tableSizeLimit = (float) NCOF::TableSize

staticprivate

Definition at line 31 of file ncof.h.

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The documentation for this class was generated from the following files:

• sdrbase/dsp/ncof.h
• sdrbase/dsp/ncof.cpp