IntHalfbandFilterDBFF< AccuType, SampleType, HBFilterOrder > Class Template Reference

#include <inthalfbandfilterdbff.h>

Public Member Functions
	IntHalfbandFilterDBFF ()
bool	workDecimateCenter (FSample *sample)
bool	workInterpolateCenterZeroStuffing (FSample *sampleIn, FSample *SampleOut)
bool	workInterpolateCenter (FSample *sampleIn, FSample *SampleOut)
bool	workDecimateLowerHalf (FSample *sample)
bool	workInterpolateLowerHalf (FSample *sampleIn, FSample *sampleOut)
bool	workInterpolateLowerHalfZeroStuffing (FSample *sampleIn, FSample *sampleOut)
bool	workDecimateUpperHalf (FSample *sample)
bool	workInterpolateUpperHalf (FSample *sampleIn, FSample *sampleOut)
bool	workInterpolateUpperHalfZeroStuffing (FSample *sampleIn, FSample *sampleOut)
void	myDecimate (const FSample *sample1, FSample *sample2)
void	myDecimate (AccuType x1, AccuType y1, AccuType *x2, AccuType *y2)
void	myInterpolateZeroStuffing (FSample *sample1, FSample *sample2)
void	myInterpolate (qint32 *x1, qint32 *y1, qint32 *x2, qint32 *y2)
void	myInterpolateInf (qint32 *x1, qint32 *y1, qint32 *x2, qint32 *y2, qint32 *x3, qint32 *y3, qint32 *x4, qint32 *y4)
void	myInterpolateSup (qint32 *x1, qint32 *y1, qint32 *x2, qint32 *y2, qint32 *x3, qint32 *y3, qint32 *x4, qint32 *y4)

Protected Member Functions
void	storeSampleReal (const Real &sampleI, const Real &sampleQ)
void	storeSampleAccu (AccuType x, AccuType y)
void	advancePointer ()
void	doFIR (FSample *sample)
void	doFIRAccu (AccuType *x, AccuType *y)
void	doInterpolateFIR (FSample *sample)
void	doInterpolateFIR (Real *x, Real *y)

Protected Attributes
SampleType	m_samplesDB [2 *(HBFIRFilterTraits< HBFilterOrder >::hbOrder - 1)][2]
int	m_ptr
int	m_size
int	m_state

Detailed Description

template<typename AccuType, typename SampleType, uint32_t HBFilterOrder>
class IntHalfbandFilterDBFF< AccuType, SampleType, HBFilterOrder >

Definition at line 31 of file inthalfbandfilterdbff.h.

Constructor & Destructor Documentation

IntHalfbandFilterDBFF()

template<typename AccuType , typename SampleType , uint32_t HBFilterOrder>

IntHalfbandFilterDBFF< AccuType, SampleType, HBFilterOrder >::IntHalfbandFilterDBFF

(

)

Definition at line 730 of file inthalfbandfilterdbff.h.

References i.

{
    m_size = HBFIRFilterTraits<HBFilterOrder>::hbOrder - 1;

    for (int i = 0; i < m_size; i++)
    {
        m_samplesDB[i][0] = 0;
        m_samplesDB[i][1] = 0;
    }

    m_ptr = 0;
    m_state = 0;
}

Member Function Documentation

advancePointer()

template<typename AccuType , typename SampleType , uint32_t HBFilterOrder>

void IntHalfbandFilterDBFF< AccuType, SampleType, HBFilterOrder >::advancePointer ( )

inlineprotected

Definition at line 637 of file inthalfbandfilterdbff.h.

    {
        m_ptr = m_ptr + 1 < m_size ? m_ptr + 1: 0;
    }

doFIR()

template<typename AccuType , typename SampleType , uint32_t HBFilterOrder>

void IntHalfbandFilterDBFF< AccuType, SampleType, HBFilterOrder >::doFIR ( FSample *  sample )

inlineprotected

Definition at line 642 of file inthalfbandfilterdbff.h.

References i, FSample::setImag(), and FSample::setReal().

    {
        int a = m_ptr + m_size; // tip pointer
        int b = m_ptr + 1; // tail pointer
        AccuType iAcc = 0;
        AccuType qAcc = 0;

        for (int i = 0; i < HBFIRFilterTraits<HBFilterOrder>::hbOrder / 4; i++)
        {
            iAcc += (m_samplesDB[a][0] + m_samplesDB[b][0]) * HBFIRFilterTraits<HBFilterOrder>::hbCoeffsF[i];
            qAcc += (m_samplesDB[a][1] + m_samplesDB[b][1]) * HBFIRFilterTraits<HBFilterOrder>::hbCoeffsF[i];
            a -= 2;
            b += 2;
        }

        iAcc += m_samplesDB[b-1][0] << (HBFIRFilterTraits<HBFilterOrder>::hbShift - 1);
        qAcc += m_samplesDB[b-1][1] << (HBFIRFilterTraits<HBFilterOrder>::hbShift - 1);

        sample->setReal(iAcc);
        sample->setImag(qAcc);
    }

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doFIRAccu()

template<typename AccuType , typename SampleType , uint32_t HBFilterOrder>

void IntHalfbandFilterDBFF< AccuType, SampleType, HBFilterOrder >::doFIRAccu ( AccuType *  x, AccuType *  y  )

inlineprotected

Definition at line 664 of file inthalfbandfilterdbff.h.

References i.

    {
        int a = m_ptr + m_size; // tip pointer
        int b = m_ptr + 1; // tail pointer
        AccuType iAcc = 0;
        AccuType qAcc = 0;

        for (int i = 0; i < HBFIRFilterTraits<HBFilterOrder>::hbOrder / 4; i++)
        {
            iAcc += (m_samplesDB[a][0] + m_samplesDB[b][0]) * HBFIRFilterTraits<HBFilterOrder>::hbCoeffsF[i];
            qAcc += (m_samplesDB[a][1] + m_samplesDB[b][1]) * HBFIRFilterTraits<HBFilterOrder>::hbCoeffsF[i];
            a -= 2;
            b += 2;
        }

        iAcc += m_samplesDB[b-1][0] / 2.0;
        qAcc += m_samplesDB[b-1][1] / 2.0;

        *x = iAcc; // HB_SHIFT incorrect do not loose the gained bit
        *y = qAcc;
    }

doInterpolateFIR() [1/2]

template<typename AccuType , typename SampleType , uint32_t HBFilterOrder>

void IntHalfbandFilterDBFF< AccuType, SampleType, HBFilterOrder >::doInterpolateFIR ( FSample *  sample )

inlineprotected

Definition at line 686 of file inthalfbandfilterdbff.h.

References i, FSample::setImag(), and FSample::setReal().

    {
        qint16 a = m_ptr;
        qint16 b = m_ptr + (HBFIRFilterTraits<HBFilterOrder>::hbOrder / 2) - 1;

        // go through samples in buffer
        AccuType iAcc = 0;
        AccuType qAcc = 0;

        for (int i = 0; i < HBFIRFilterTraits<HBFilterOrder>::hbOrder / 4; i++)
        {
            iAcc += (m_samplesDB[a][0] + m_samplesDB[b][0]) * HBFIRFilterTraits<HBFilterOrder>::hbCoeffsF[i];
            qAcc += (m_samplesDB[a][1] + m_samplesDB[b][1]) * HBFIRFilterTraits<HBFilterOrder>::hbCoeffsF[i];
            a++;
            b--;
        }

        sample->setReal(iAcc);
        sample->setImag(qAcc);
    }

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doInterpolateFIR() [2/2]

template<typename AccuType , typename SampleType , uint32_t HBFilterOrder>

void IntHalfbandFilterDBFF< AccuType, SampleType, HBFilterOrder >::doInterpolateFIR ( Real *  x, Real *  y  )

inlineprotected

Definition at line 707 of file inthalfbandfilterdbff.h.

References i.

    {
        qint16 a = m_ptr;
        qint16 b = m_ptr + (HBFIRFilterTraits<HBFilterOrder>::hbOrder / 2) - 1;

        // go through samples in buffer
        AccuType iAcc = 0;
        AccuType qAcc = 0;

        for (int i = 0; i < HBFIRFilterTraits<HBFilterOrder>::hbOrder / 4; i++)
        {
            iAcc += (m_samplesDB[a][0] + m_samplesDB[b][0]) * HBFIRFilterTraits<HBFilterOrder>::hbCoeffsF[i];
            qAcc += (m_samplesDB[a][1] + m_samplesDB[b][1]) * HBFIRFilterTraits<HBFilterOrder>::hbCoeffsF[i];
            a++;
            b--;
        }

        *x = iAcc;
        *y = qAcc;
    }

myDecimate() [1/2]

template<typename AccuType , typename SampleType , uint32_t HBFilterOrder>

void IntHalfbandFilterDBFF< AccuType, SampleType, HBFilterOrder >::myDecimate ( const FSample *  sample1, FSample *  sample2  )

inline

Definition at line 527 of file inthalfbandfilterdbff.h.

References FSample::imag(), and FSample::real().

    {
        storeSampleReal((Real) sample1->real(), (Real) sample1->imag());
        advancePointer();

        storeSampleReal((Real) sample2->real(), (Real) sample2->imag());
        doFIR(sample2);
        advancePointer();
    }

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myDecimate() [2/2]

template<typename AccuType , typename SampleType , uint32_t HBFilterOrder>

void IntHalfbandFilterDBFF< AccuType, SampleType, HBFilterOrder >::myDecimate ( AccuType  x1, AccuType  y1, AccuType *  x2, AccuType *  y2  )

inline

Definition at line 537 of file inthalfbandfilterdbff.h.

    {
        storeSampleAccu(x1, y1);
        advancePointer();

        storeSampleAccu(*x2, *y2);
        doFIRAccu(x2, y2);
        advancePointer();
    }

myInterpolate()

template<typename AccuType , typename SampleType , uint32_t HBFilterOrder>

void IntHalfbandFilterDBFF< AccuType, SampleType, HBFilterOrder >::myInterpolate ( qint32 *  x1, qint32 *  y1, qint32 *  x2, qint32 *  y2  )

inline

Optimized upsampler by 2 not calculating FIR with inserted null samples

Definition at line 560 of file inthalfbandfilterdbff.h.

    {
        // insert sample into ring double buffer
        m_samplesDB[m_ptr][0] = *x1;
        m_samplesDB[m_ptr][1] = *y1;
        m_samplesDB[m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder/2][0] = *x1;
        m_samplesDB[m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder/2][1] = *y1;

        // advance pointer
        if (m_ptr < (HBFIRFilterTraits<HBFilterOrder>::hbOrder/2) - 1) {
            m_ptr++;
        } else {
            m_ptr = 0;
        }

        // first output sample calculated with the middle peak
        *x1 = m_samplesDB[m_ptr + (HBFIRFilterTraits<HBFilterOrder>::hbOrder/4) - 1][0];
        *y1 = m_samplesDB[m_ptr + (HBFIRFilterTraits<HBFilterOrder>::hbOrder/4) - 1][1];

        // second sample calculated with the filter
        doInterpolateFIR(x2, y2);
    }

myInterpolateInf()

template<typename AccuType , typename SampleType , uint32_t HBFilterOrder>

void IntHalfbandFilterDBFF< AccuType, SampleType, HBFilterOrder >::myInterpolateInf ( qint32 *  x1, qint32 *  y1, qint32 *  x2, qint32 *  y2, qint32 *  x3, qint32 *  y3, qint32 *  x4, qint32 *  y4  )

inline

Definition at line 583 of file inthalfbandfilterdbff.h.

    {
        myInterpolate(x1, y1, x2, y2);
        myInterpolate(x3, y3, x4, y4);
        // rotation
        qint32 x;
        x = *x1;
        *x1 = *y1;
        *y1 = -x;
        *x2 = -*x2;
        *y2 = -*y2;
        x = *x3;
        *x3 = -*y3;
        *y3 = x;
    }

myInterpolateSup()

template<typename AccuType , typename SampleType , uint32_t HBFilterOrder>

void IntHalfbandFilterDBFF< AccuType, SampleType, HBFilterOrder >::myInterpolateSup ( qint32 *  x1, qint32 *  y1, qint32 *  x2, qint32 *  y2, qint32 *  x3, qint32 *  y3, qint32 *  x4, qint32 *  y4  )

inline

Definition at line 599 of file inthalfbandfilterdbff.h.

    {
        myInterpolate(x1, y1, x2, y2);
        myInterpolate(x3, y3, x4, y4);
        // rotation
        qint32 x;
        x = *x1;
        *x1 = -*y1;
        *y1 = x;
        *x2 = -*x2;
        *y2 = -*y2;
        x = *x3;
        *x3 = *y3;
        *y3 = -x;
    }

myInterpolateZeroStuffing()

template<typename AccuType , typename SampleType , uint32_t HBFilterOrder>

void IntHalfbandFilterDBFF< AccuType, SampleType, HBFilterOrder >::myInterpolateZeroStuffing ( FSample *  sample1, FSample *  sample2  )

inline

Simple zero stuffing and filter

Definition at line 548 of file inthalfbandfilterdbff.h.

References FSample::imag(), and FSample::real().

    {
        storeSampleReal((Real) sample1->real(), (Real) sample1->imag());
        doFIR(sample1);
        advancePointer();

        storeSampleReal((Real) 0, (Real) 0);
        doFIR(sample2);
        advancePointer();
    }

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storeSampleAccu()

template<typename AccuType , typename SampleType , uint32_t HBFilterOrder>

void IntHalfbandFilterDBFF< AccuType, SampleType, HBFilterOrder >::storeSampleAccu ( AccuType  x, AccuType  y  )

inlineprotected

Definition at line 629 of file inthalfbandfilterdbff.h.

    {
        m_samplesDB[m_ptr][0] = x;
        m_samplesDB[m_ptr][1] = y;
        m_samplesDB[m_ptr + m_size][0] = x;
        m_samplesDB[m_ptr + m_size][1] = y;
    }

storeSampleReal()

template<typename AccuType , typename SampleType , uint32_t HBFilterOrder>

void IntHalfbandFilterDBFF< AccuType, SampleType, HBFilterOrder >::storeSampleReal ( const Real &  sampleI, const Real &  sampleQ  )

inlineprotected

Definition at line 621 of file inthalfbandfilterdbff.h.

    {
        m_samplesDB[m_ptr][0] = sampleI;
        m_samplesDB[m_ptr][1] = sampleQ;
        m_samplesDB[m_ptr + m_size][0] = sampleI;
        m_samplesDB[m_ptr + m_size][1] = sampleQ;
    }

workDecimateCenter()

template<typename AccuType , typename SampleType , uint32_t HBFilterOrder>

bool IntHalfbandFilterDBFF< AccuType, SampleType, HBFilterOrder >::workDecimateCenter ( FSample *  sample )

inline

Definition at line 36 of file inthalfbandfilterdbff.h.

References FSample::imag(), and FSample::real().

    {
        // insert sample into ring-buffer
        storeSampleReal((Real) sample->real(), (Real) sample->imag());

        switch(m_state)
        {
            case 0:
                // advance write-pointer
                advancePointer();
                // next state
                m_state = 1;
                // tell caller we don't have a new sample
                return false;

            default:
                // save result
                doFIR(sample);
                // advance write-pointer
                advancePointer();
                // next state
                m_state = 0;

                // tell caller we have a new sample
                return true;
        }
    }

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workDecimateLowerHalf()

template<typename AccuType , typename SampleType , uint32_t HBFilterOrder>

bool IntHalfbandFilterDBFF< AccuType, SampleType, HBFilterOrder >::workDecimateLowerHalf ( FSample *  sample )

inline

Definition at line 130 of file inthalfbandfilterdbff.h.

References FSample::imag(), and FSample::real().

    {
        switch(m_state)
        {
            case 0:
                // insert sample into ring-buffer
                storeSampleReal((Real) -sample->imag(), (Real) sample->real());
                // advance write-pointer
                advancePointer();
                // next state
                m_state = 1;
                // tell caller we don't have a new sample
                return false;

            case 1:
                // insert sample into ring-buffer
                storeSampleReal((Real) -sample->real(), (Real) -sample->imag());
                // save result
                doFIR(sample);
                // advance write-pointer
                advancePointer();
                // next state
                m_state = 2;
                // tell caller we have a new sample
                return true;

            case 2:
                // insert sample into ring-buffer
                storeSampleReal((Real) sample->imag(), (Real) -sample->real());
                // advance write-pointer
                advancePointer();
                // next state
                m_state = 3;
                // tell caller we don't have a new sample
                return false;

            default:
                // insert sample into ring-buffer
                storeSampleReal((Real) sample->real(), (Real) sample->imag());
                // save result
                doFIR(sample);
                // advance write-pointer
                advancePointer();
                // next state
                m_state = 0;
                // tell caller we have a new sample
                return true;
        }
    }

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workDecimateUpperHalf()

template<typename AccuType , typename SampleType , uint32_t HBFilterOrder>

bool IntHalfbandFilterDBFF< AccuType, SampleType, HBFilterOrder >::workDecimateUpperHalf ( FSample *  sample )

inline

Definition at line 329 of file inthalfbandfilterdbff.h.

References FSample::imag(), and FSample::real().

    {
        switch(m_state)
        {
            case 0:
                // insert sample into ring-buffer
                storeSampleReal((Real) sample->imag(), (Real) -sample->real());
                // advance write-pointer
                advancePointer();
                // next state
                m_state = 1;
                // tell caller we don't have a new sample
                return false;

            case 1:
                // insert sample into ring-buffer
                storeSampleReal((Real) -sample->real(), (Real) -sample->imag());
                // save result
                doFIR(sample);
                // advance write-pointer
                advancePointer();
                // next state
                m_state = 2;
                // tell caller we have a new sample
                return true;

            case 2:
                // insert sample into ring-buffer
                storeSampleReal((Real) -sample->imag(), (Real) sample->real());
                // advance write-pointer
                advancePointer();
                // next state
                m_state = 3;
                // tell caller we don't have a new sample
                return false;

            default:
                // insert sample into ring-buffer
                storeSampleReal((Real) sample->real(), (Real) sample->imag());
                // save result
                doFIR(sample);
                // advance write-pointer
                advancePointer();
                // next state
                m_state = 0;
                // tell caller we have a new sample
                return true;
        }
    }

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workInterpolateCenter()

template<typename AccuType , typename SampleType , uint32_t HBFilterOrder>

bool IntHalfbandFilterDBFF< AccuType, SampleType, HBFilterOrder >::workInterpolateCenter ( FSample *  sampleIn, FSample *  SampleOut  )

inline

Optimized upsampler by 2 not calculating FIR with inserted null samples

Definition at line 96 of file inthalfbandfilterdbff.h.

References FSample::imag(), FSample::real(), FSample::setImag(), and FSample::setReal().

    {
        switch(m_state)
        {
        case 0:
            // return the middle peak
            SampleOut->setReal(m_samplesDB[m_ptr + (HBFIRFilterTraits<HBFilterOrder>::hbOrder/4) - 1][0]);
            SampleOut->setImag(m_samplesDB[m_ptr + (HBFIRFilterTraits<HBFilterOrder>::hbOrder/4) - 1][1]);
            m_state = 1;  // next state
            return false; // tell caller we didn't consume the sample

        default:
            // calculate with non null samples
            doInterpolateFIR(SampleOut);

            // insert sample into ring double buffer
            m_samplesDB[m_ptr][0] = sampleIn->real();
            m_samplesDB[m_ptr][1] = sampleIn->imag();
            m_samplesDB[m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder/2][0] = sampleIn->real();
            m_samplesDB[m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder/2][1] = sampleIn->imag();

            // advance pointer
            if (m_ptr < (HBFIRFilterTraits<HBFilterOrder>::hbOrder/2) - 1) {
                m_ptr++;
            } else {
                m_ptr = 0;
            }

            m_state = 0; // next state
            return true; // tell caller we consumed the sample
        }
    }

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workInterpolateCenterZeroStuffing()

template<typename AccuType , typename SampleType , uint32_t HBFilterOrder>

bool IntHalfbandFilterDBFF< AccuType, SampleType, HBFilterOrder >::workInterpolateCenterZeroStuffing ( FSample *  sampleIn, FSample *  SampleOut  )

inline

Definition at line 65 of file inthalfbandfilterdbff.h.

References FSample::imag(), and FSample::real().

    {
        switch(m_state)
        {
            case 0:
                // insert sample into ring-buffer
                storeSampleReal((Real) 0, (Real) 0);
                // save result
                doFIR(SampleOut);
                // advance write-pointer
                advancePointer();
                // next state
                m_state = 1;
                // tell caller we didn't consume the sample
                return false;

            default:
                // insert sample into ring-buffer
                storeSampleReal((Real) sampleIn->real(), (Real) sampleIn->imag());
                // save result
                doFIR(SampleOut);
                // advance write-pointer
                advancePointer();
                // next state
                m_state = 0;
                // tell caller we consumed the sample
                return true;
        }
    }

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workInterpolateLowerHalf()

template<typename AccuType , typename SampleType , uint32_t HBFilterOrder>

bool IntHalfbandFilterDBFF< AccuType, SampleType, HBFilterOrder >::workInterpolateLowerHalf ( FSample *  sampleIn, FSample *  sampleOut  )

inline

Optimized upsampler by 2 not calculating FIR with inserted null samples

Definition at line 181 of file inthalfbandfilterdbff.h.

References FSample::imag(), FSample::real(), FSample::setImag(), and FSample::setReal().

    {
        FSample s;

        switch(m_state)
        {
        case 0:
            // return the middle peak
            sampleOut->setReal(m_samplesDB[m_ptr + (HBFIRFilterTraits<HBFilterOrder>::hbOrder/4) - 1][1]);  // imag
            sampleOut->setImag(-m_samplesDB[m_ptr + (HBFIRFilterTraits<HBFilterOrder>::hbOrder/4) - 1][0]); // - real
            m_state = 1;  // next state
            return false; // tell caller we didn't consume the sample

        case 1:
            // calculate with non null samples
            doInterpolateFIR(&s);
            sampleOut->setReal(-s.real());
            sampleOut->setImag(-s.imag());

            // insert sample into ring double buffer
            m_samplesDB[m_ptr][0] = sampleIn->real();
            m_samplesDB[m_ptr][1] = sampleIn->imag();
            m_samplesDB[m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder/2][0] = sampleIn->real();
            m_samplesDB[m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder/2][1] = sampleIn->imag();

            // advance pointer
            if (m_ptr < (HBFIRFilterTraits<HBFilterOrder>::hbOrder/2) - 1) {
                m_ptr++;
            } else {
                m_ptr = 0;
            }

            m_state = 2; // next state
            return true; // tell caller we consumed the sample

        case 2:
            // return the middle peak
            sampleOut->setReal(-m_samplesDB[m_ptr + (HBFIRFilterTraits<HBFilterOrder>::hbOrder/4) - 1][1]);  // - imag
            sampleOut->setImag(m_samplesDB[m_ptr + (HBFIRFilterTraits<HBFilterOrder>::hbOrder/4) - 1][0]); // real
            m_state = 3;  // next state
            return false; // tell caller we didn't consume the sample

        default:
            // calculate with non null samples
            doInterpolateFIR(&s);
            sampleOut->setReal(s.real());
            sampleOut->setImag(s.imag());

            // insert sample into ring double buffer
            m_samplesDB[m_ptr][0] = sampleIn->real();
            m_samplesDB[m_ptr][1] = sampleIn->imag();
            m_samplesDB[m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder/2][0] = sampleIn->real();
            m_samplesDB[m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder/2][1] = sampleIn->imag();

            // advance pointer
            if (m_ptr < (HBFIRFilterTraits<HBFilterOrder>::hbOrder/2) - 1) {
                m_ptr++;
            } else {
                m_ptr = 0;
            }

            m_state = 0; // next state
            return true; // tell caller we consumed the sample
        }
    }

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workInterpolateLowerHalfZeroStuffing()

template<typename AccuType , typename SampleType , uint32_t HBFilterOrder>

bool IntHalfbandFilterDBFF< AccuType, SampleType, HBFilterOrder >::workInterpolateLowerHalfZeroStuffing ( FSample *  sampleIn, FSample *  sampleOut  )

inline

Definition at line 248 of file inthalfbandfilterdbff.h.

References FSample::imag(), FSample::real(), FSample::setImag(), and FSample::setReal().

    {
        FSample s;

        switch(m_state)
        {
        case 0:
            // insert sample into ring-buffer
            storeSampleReal((Real) 0, (Real) 0);

            // save result
            doFIR(&s);
            sampleOut->setReal(s.imag());
            sampleOut->setImag(-s.real());

            // advance write-pointer
            advancePointer();

            // next state
            m_state = 1;

            // tell caller we didn't consume the sample
            return false;

        case 1:
            // insert sample into ring-buffer
            storeSampleReal((Real) sampleIn->real(), (Real) sampleIn->imag());

            // save result
            doFIR(&s);
            sampleOut->setReal(-s.real());
            sampleOut->setImag(-s.imag());

            // advance write-pointer
            advancePointer();

            // next state
            m_state = 2;

            // tell caller we consumed the sample
            return true;

        case 2:
            // insert sample into ring-buffer
            storeSampleReal((Real) 0, (Real) 0);

            // save result
            doFIR(&s);
            sampleOut->setReal(-s.imag());
            sampleOut->setImag(s.real());

            // advance write-pointer
            advancePointer();

            // next state
            m_state = 3;

            // tell caller we didn't consume the sample
            return false;

        default:
            // insert sample into ring-buffer
            storeSampleReal((Real) sampleIn->real(), (Real) sampleIn->imag());

            // save result
            doFIR(&s);
            sampleOut->setReal(s.real());
            sampleOut->setImag(s.imag());

            // advance write-pointer
            advancePointer();

            // next state
            m_state = 0;

            // tell caller we consumed the sample
            return true;
        }
    }

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workInterpolateUpperHalf()

template<typename AccuType , typename SampleType , uint32_t HBFilterOrder>

bool IntHalfbandFilterDBFF< AccuType, SampleType, HBFilterOrder >::workInterpolateUpperHalf ( FSample *  sampleIn, FSample *  sampleOut  )

inline

Optimized upsampler by 2 not calculating FIR with inserted null samples

Definition at line 380 of file inthalfbandfilterdbff.h.

References FSample::imag(), FSample::real(), FSample::setImag(), and FSample::setReal().

    {
        FSample s;

        switch(m_state)
        {
        case 0:
            // return the middle peak
            sampleOut->setReal(-m_samplesDB[m_ptr + (HBFIRFilterTraits<HBFilterOrder>::hbOrder/4) - 1][1]); // - imag
            sampleOut->setImag(m_samplesDB[m_ptr + (HBFIRFilterTraits<HBFilterOrder>::hbOrder/4) - 1][0]); // + real
            m_state = 1;  // next state
            return false; // tell caller we didn't consume the sample

        case 1:
            // calculate with non null samples
            doInterpolateFIR(&s);
            sampleOut->setReal(-s.real());
            sampleOut->setImag(-s.imag());

            // insert sample into ring double buffer
            m_samplesDB[m_ptr][0] = sampleIn->real();
            m_samplesDB[m_ptr][1] = sampleIn->imag();
            m_samplesDB[m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder/2][0] = sampleIn->real();
            m_samplesDB[m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder/2][1] = sampleIn->imag();

            // advance pointer
            if (m_ptr < (HBFIRFilterTraits<HBFilterOrder>::hbOrder/2) - 1) {
                m_ptr++;
            } else {
                m_ptr = 0;
            }

            m_state = 2; // next state
            return true; // tell caller we consumed the sample

        case 2:
            // return the middle peak
            sampleOut->setReal(m_samplesDB[m_ptr + (HBFIRFilterTraits<HBFilterOrder>::hbOrder/4) - 1][1]);  // + imag
            sampleOut->setImag(-m_samplesDB[m_ptr + (HBFIRFilterTraits<HBFilterOrder>::hbOrder/4) - 1][0]);   // - real
            m_state = 3;  // next state
            return false; // tell caller we didn't consume the sample

        default:
            // calculate with non null samples
            doInterpolateFIR(&s);
            sampleOut->setReal(s.real());
            sampleOut->setImag(s.imag());

            // insert sample into ring double buffer
            m_samplesDB[m_ptr][0] = sampleIn->real();
            m_samplesDB[m_ptr][1] = sampleIn->imag();
            m_samplesDB[m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder/2][0] = sampleIn->real();
            m_samplesDB[m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder/2][1] = sampleIn->imag();

            // advance pointer
            if (m_ptr < (HBFIRFilterTraits<HBFilterOrder>::hbOrder/2) - 1) {
                m_ptr++;
            } else {
                m_ptr = 0;
            }

            m_state = 0; // next state
            return true; // tell caller we consumed the sample
        }
    }

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workInterpolateUpperHalfZeroStuffing()

template<typename AccuType , typename SampleType , uint32_t HBFilterOrder>

bool IntHalfbandFilterDBFF< AccuType, SampleType, HBFilterOrder >::workInterpolateUpperHalfZeroStuffing ( FSample *  sampleIn, FSample *  sampleOut  )

inline

Definition at line 447 of file inthalfbandfilterdbff.h.

References FSample::imag(), FSample::real(), FSample::setImag(), and FSample::setReal().

    {
        FSample s;

        switch(m_state)
        {
        case 0:
            // insert sample into ring-buffer
            storeSampleReal((Real) 0, (Real) 0);

            // save result
            doFIR(&s);
            sampleOut->setReal(-s.imag());
            sampleOut->setImag(s.real());

            // advance write-pointer
            advancePointer();

            // next state
            m_state = 1;

            // tell caller we didn't consume the sample
            return false;

        case 1:
            // insert sample into ring-buffer
            storeSampleReal((Real) sampleIn->real(), (Real) sampleIn->imag());

            // save result
            doFIR(&s);
            sampleOut->setReal(-s.real());
            sampleOut->setImag(-s.imag());

            // advance write-pointer
            advancePointer();

            // next state
            m_state = 2;

            // tell caller we consumed the sample
            return true;

        case 2:
            // insert sample into ring-buffer
            storeSampleReal((Real) 0, (Real) 0);

            // save result
            doFIR(&s);
            sampleOut->setReal(s.imag());
            sampleOut->setImag(-s.real());

            // advance write-pointer
            advancePointer();

            // next state
            m_state = 3;

            // tell caller we didn't consume the sample
            return false;

        default:
            // insert sample into ring-buffer
            storeSampleReal((Real) sampleIn->real(), (Real) sampleIn->imag());

            // save result
            doFIR(&s);
            sampleOut->setReal(s.real());
            sampleOut->setImag(s.imag());

            // advance write-pointer
            advancePointer();

            // next state
            m_state = 0;

            // tell caller we consumed the sample
            return true;
        }
    }

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Member Data Documentation

m_ptr

template<typename AccuType , typename SampleType , uint32_t HBFilterOrder>

int IntHalfbandFilterDBFF< AccuType, SampleType, HBFilterOrder >::m_ptr

protected

Definition at line 617 of file inthalfbandfilterdbff.h.

m_samplesDB

template<typename AccuType , typename SampleType , uint32_t HBFilterOrder>

SampleType IntHalfbandFilterDBFF< AccuType, SampleType, HBFilterOrder >::m_samplesDB[2 *(HBFIRFilterTraits< HBFilterOrder >::hbOrder - 1)][2]

protected

Definition at line 616 of file inthalfbandfilterdbff.h.

m_size

template<typename AccuType , typename SampleType , uint32_t HBFilterOrder>

int IntHalfbandFilterDBFF< AccuType, SampleType, HBFilterOrder >::m_size

protected

Definition at line 618 of file inthalfbandfilterdbff.h.

m_state

template<typename AccuType , typename SampleType , uint32_t HBFilterOrder>

int IntHalfbandFilterDBFF< AccuType, SampleType, HBFilterOrder >::m_state

protected

Definition at line 619 of file inthalfbandfilterdbff.h.

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

• sdrbase/dsp/inthalfbandfilterdbff.h