IntHalfbandFilter< AccuType, HBFilterOrder > Class Template Reference

#include <inthalfbandfilter.h>

Public Member Functions
	IntHalfbandFilter ()
bool	workDecimateCenter (Sample *sample)
bool	workInterpolateCenterZeroStuffing (Sample *sampleIn, Sample *SampleOut)
bool	workInterpolateCenter (Sample *sampleIn, Sample *SampleOut)
bool	workDecimateLowerHalf (Sample *sample)
bool	workInterpolateLowerHalfZeroStuffing (Sample *sampleIn, Sample *sampleOut)
bool	workInterpolateLowerHalf (Sample *sampleIn, Sample *sampleOut)
bool	workDecimateUpperHalf (Sample *sample)
bool	workInterpolateUpperHalfZeroStuffing (Sample *sampleIn, Sample *sampleOut)
bool	workInterpolateUpperHalf (Sample *sampleIn, Sample *sampleOut)
void	myDecimate (const Sample *sample1, Sample *sample2)
void	myDecimate (qint32 x1, qint32 y1, qint32 *x2, qint32 *y2)
void	myInterpolateZeroStuffing (Sample *sample1, Sample *sample2)
void	myInterpolateZeroStuffing (qint32 *x1, qint32 *y1, qint32 *x2, qint32 *y2)
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	doFIR (Sample *sample)
void	doInterpolateFIR (Sample *sample)
void	doInterpolateFIR (qint32 *x, qint32 *y)
void	doFIR (qint32 *x, qint32 *y)

Protected Attributes
AccuType	m_samples [HBFIRFilterTraits< HBFilterOrder >::hbOrder+1][2]
qint16	m_ptr
int	m_state

Detailed Description

template<typename AccuType, uint32_t HBFilterOrder>
class IntHalfbandFilter< AccuType, HBFilterOrder >

Definition at line 28 of file inthalfbandfilter.h.

Constructor & Destructor Documentation

IntHalfbandFilter()

template<typename AccuType, uint32_t HBFilterOrder>

IntHalfbandFilter< AccuType, HBFilterOrder >::IntHalfbandFilter ( )

inline

Definition at line 30 of file inthalfbandfilter.h.

                        :
        m_ptr(0),
        m_state(0)
    {
        for (int i = 0; i < HBFIRFilterTraits<HBFilterOrder>::hbOrder + 1; i++)
        {
            m_samples[i][0] = 0;
            m_samples[i][1] = 0;
        }
    }

Member Function Documentation

doFIR() [1/2]

template<typename AccuType, uint32_t HBFilterOrder>

void IntHalfbandFilter< AccuType, HBFilterOrder >::doFIR ( Sample *  sample )

inlineprotected

Definition at line 788 of file inthalfbandfilter.h.

    {
        // init read-pointer
        int a = HBFIRFilterTraits<HBFilterOrder>::hbMod[m_ptr + 2 + 1]; // 0 + 1
        int b = HBFIRFilterTraits<HBFilterOrder>::hbMod[m_ptr + 2 - 2]; //-1 - 1

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

        for (int i = 0; i < HBFIRFilterTraits<HBFilterOrder>::hbOrder / 4; i++)
        {
            // do multiply-accumulate
            //qint32 iTmp = m_samples[a][0] + m_samples[b][0]; // Valgrind optim
            //qint32 qTmp = m_samples[a][1] + m_samples[b][1]; // Valgrind optim
            iAcc += (m_samples[a][0] + m_samples[b][0]) * HBFIRFilterTraits<HBFilterOrder>::hbCoeffs[i];
            qAcc += (m_samples[a][1] + m_samples[b][1]) * HBFIRFilterTraits<HBFilterOrder>::hbCoeffs[i];

            // update read-pointer
            a = HBFIRFilterTraits<HBFilterOrder>::hbMod[a + 2 + 2];
            b = HBFIRFilterTraits<HBFilterOrder>::hbMod[b + 2 - 2];
        }

        a = HBFIRFilterTraits<HBFilterOrder>::hbMod[a + 2 - 1];

        iAcc += ((qint32)m_samples[a][0] + 1) << (HBFIRFilterTraits<HBFilterOrder>::hbShift - 1);
        qAcc += ((qint32)m_samples[a][1] + 1) << (HBFIRFilterTraits<HBFilterOrder>::hbShift - 1);

        sample->setReal(iAcc >> (HBFIRFilterTraits<HBFilterOrder>::hbShift -1));
        sample->setImag(qAcc >> (HBFIRFilterTraits<HBFilterOrder>::hbShift -1));
    }

doFIR() [2/2]

template<typename AccuType, uint32_t HBFilterOrder>

void IntHalfbandFilter< AccuType, HBFilterOrder >::doFIR ( qint32 *  x, qint32 *  y  )

inlineprotected

Definition at line 862 of file inthalfbandfilter.h.

    {
        // Coefficents. This is a sinc function:
        // Half of the half of coefficients are stored because:
        // - half of the coefficients are 0
        // - there is a symmertry around the central 0.5 coefficient (not stored either)
        // There are actually order+1 coefficients

        // init read-pointer
        int a = HBFIRFilterTraits<HBFilterOrder>::hbMod[m_ptr + 2 + 1]; // 0 + 1
        int b = HBFIRFilterTraits<HBFilterOrder>::hbMod[m_ptr + 2 - 2]; //-1 - 1

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

        for (int i = 0; i < HBFIRFilterTraits<HBFilterOrder>::hbOrder / 4; i++)
        {
            // do multiply-accumulate
            //qint32 iTmp = m_samples[a][0] + m_samples[b][0]; // Valgrind optim
            //qint32 qTmp = m_samples[a][1] + m_samples[b][1]; // Valgrind optim
            iAcc += (m_samples[a][0] + m_samples[b][0]) * HBFIRFilterTraits<HBFilterOrder>::hbCoeffs[i];
            qAcc += (m_samples[a][1] + m_samples[b][1]) * HBFIRFilterTraits<HBFilterOrder>::hbCoeffs[i];

            // update read-pointer
            a = HBFIRFilterTraits<HBFilterOrder>::hbMod[a + 2 + 2];
            b = HBFIRFilterTraits<HBFilterOrder>::hbMod[b + 2 - 2];
        }

        a = HBFIRFilterTraits<HBFilterOrder>::hbMod[a + 2 - 1];

        iAcc += ((qint32)m_samples[a][0] + 1) << (HBFIRFilterTraits<HBFilterOrder>::hbShift - 1);
        qAcc += ((qint32)m_samples[a][1] + 1) << (HBFIRFilterTraits<HBFilterOrder>::hbShift - 1);

        *x = iAcc >> (HBFIRFilterTraits<HBFilterOrder>::hbShift -1); // HB_SHIFT incorrect do not loose the gained bit
        *y = qAcc >> (HBFIRFilterTraits<HBFilterOrder>::hbShift -1);
    }

doInterpolateFIR() [1/2]

template<typename AccuType, uint32_t HBFilterOrder>

void IntHalfbandFilter< AccuType, HBFilterOrder >::doInterpolateFIR ( Sample *  sample )

inlineprotected

Definition at line 820 of file inthalfbandfilter.h.

    {
        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_samples[a][0] + m_samples[b][0]) * HBFIRFilterTraits<HBFilterOrder>::hbCoeffs[i];
            qAcc += (m_samples[a][1] + m_samples[b][1]) * HBFIRFilterTraits<HBFilterOrder>::hbCoeffs[i];
            a++;
            b--;
        }

        sample->setReal(iAcc >> (HBFIRFilterTraits<HBFilterOrder>::hbShift -1));
        sample->setImag(qAcc >> (HBFIRFilterTraits<HBFilterOrder>::hbShift -1));
    }

doInterpolateFIR() [2/2]

template<typename AccuType, uint32_t HBFilterOrder>

void IntHalfbandFilter< AccuType, HBFilterOrder >::doInterpolateFIR ( qint32 *  x, qint32 *  y  )

inlineprotected

Definition at line 841 of file inthalfbandfilter.h.

    {
        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_samples[a][0] + m_samples[b][0]) * HBFIRFilterTraits<HBFilterOrder>::hbCoeffs[i];
            qAcc += (m_samples[a][1] + m_samples[b][1]) * HBFIRFilterTraits<HBFilterOrder>::hbCoeffs[i];
            a++;
            b--;
        }

        *x = iAcc >> (HBFIRFilterTraits<HBFilterOrder>::hbShift -1);
        *y = qAcc >> (HBFIRFilterTraits<HBFilterOrder>::hbShift -1);
    }

myDecimate() [1/2]

template<typename AccuType, uint32_t HBFilterOrder>

void IntHalfbandFilter< AccuType, HBFilterOrder >::myDecimate ( const Sample *  sample1, Sample *  sample2  )

inline

Definition at line 663 of file inthalfbandfilter.h.

    {
        m_samples[m_ptr][0] = sample1->real();
        m_samples[m_ptr][1] = sample1->imag();
        m_ptr = HBFIRFilterTraits<HBFilterOrder>::hbMod[m_ptr + 2 - 1];

        m_samples[m_ptr][0] = sample2->real();
        m_samples[m_ptr][1] = sample2->imag();

        doFIR(sample2);

        m_ptr = HBFIRFilterTraits<HBFilterOrder>::hbMod[m_ptr + 2 - 1];
    }

myDecimate() [2/2]

template<typename AccuType, uint32_t HBFilterOrder>

void IntHalfbandFilter< AccuType, HBFilterOrder >::myDecimate ( qint32  x1, qint32  y1, qint32 *  x2, qint32 *  y2  )

inline

Definition at line 677 of file inthalfbandfilter.h.

    {
        m_samples[m_ptr][0] = x1;
        m_samples[m_ptr][1] = y1;
        m_ptr = HBFIRFilterTraits<HBFilterOrder>::hbMod[m_ptr + 2 - 1];

        m_samples[m_ptr][0] = *x2;
        m_samples[m_ptr][1] = *y2;

        doFIR(x2, y2);

        m_ptr = HBFIRFilterTraits<HBFilterOrder>::hbMod[m_ptr + 2 - 1];
    }

myInterpolate()

template<typename AccuType, uint32_t HBFilterOrder>

void IntHalfbandFilter< AccuType, 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 728 of file inthalfbandfilter.h.

    {
        // insert sample into ring double buffer
        m_samples[m_ptr][0] = *x1;
        m_samples[m_ptr][1] = *y1;
        m_samples[m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder/2][0] = *x1;
        m_samples[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_samples[m_ptr + (HBFIRFilterTraits<HBFilterOrder>::hbOrder/4) - 1][0];
        *y1 = m_samples[m_ptr + (HBFIRFilterTraits<HBFilterOrder>::hbOrder/4) - 1][1];

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

myInterpolateInf()

template<typename AccuType, uint32_t HBFilterOrder>

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

inline

Definition at line 751 of file inthalfbandfilter.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, uint32_t HBFilterOrder>

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

inline

Definition at line 767 of file inthalfbandfilter.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() [1/2]

template<typename AccuType, uint32_t HBFilterOrder>

void IntHalfbandFilter< AccuType, HBFilterOrder >::myInterpolateZeroStuffing ( Sample *  sample1, Sample *  sample2  )

inline

Simple zero stuffing and filter

Definition at line 692 of file inthalfbandfilter.h.

    {
        m_samples[m_ptr][0] = sample1->real();
        m_samples[m_ptr][1] = sample1->imag();

        doFIR(sample1);

        m_ptr = HBFIRFilterTraits<HBFilterOrder>::hbMod[m_ptr + 2 - 1];

        m_samples[m_ptr][0] = 0;
        m_samples[m_ptr][1] = 0;

        doFIR(sample2);

        m_ptr = HBFIRFilterTraits<HBFilterOrder>::hbMod[m_ptr + 2 - 1];
    }

myInterpolateZeroStuffing() [2/2]

template<typename AccuType, uint32_t HBFilterOrder>

void IntHalfbandFilter< AccuType, HBFilterOrder >::myInterpolateZeroStuffing ( qint32 *  x1, qint32 *  y1, qint32 *  x2, qint32 *  y2  )

inline

Simple zero stuffing and filter

Definition at line 710 of file inthalfbandfilter.h.

    {
        m_samples[m_ptr][0] = *x1;
        m_samples[m_ptr][1] = *y1;

        doFIR(x1, y1);

        m_ptr = HBFIRFilterTraits<HBFilterOrder>::hbMod[m_ptr + 2 - 1];

        m_samples[m_ptr][0] = 0;
        m_samples[m_ptr][1] = 0;

        doFIR(x2, y2);

        m_ptr = HBFIRFilterTraits<HBFilterOrder>::hbMod[m_ptr + 2 - 1];
    }

workDecimateCenter()

template<typename AccuType, uint32_t HBFilterOrder>

bool IntHalfbandFilter< AccuType, HBFilterOrder >::workDecimateCenter ( Sample *  sample )

inline

Definition at line 42 of file inthalfbandfilter.h.

    {
        // insert sample into ring-buffer
        m_samples[m_ptr][0] = sample->real();
        m_samples[m_ptr][1] = sample->imag();

        switch(m_state)
        {
            case 0:
                // advance write-pointer
                m_ptr = (m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder) % (HBFIRFilterTraits<HBFilterOrder>::hbOrder + 1);

                // next state
                m_state = 1;

                // tell caller we don't have a new sample
                return false;

            default:
                // save result
                doFIR(sample);

                // advance write-pointer
                m_ptr = (m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder) % (HBFIRFilterTraits<HBFilterOrder>::hbOrder + 1);

                // next state
                m_state = 0;

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

workDecimateLowerHalf()

template<typename AccuType, uint32_t HBFilterOrder>

bool IntHalfbandFilter< AccuType, HBFilterOrder >::workDecimateLowerHalf ( Sample *  sample )

inline

Definition at line 222 of file inthalfbandfilter.h.

    {
        switch(m_state)
        {
            case 0:
                // insert sample into ring-buffer
                m_samples[m_ptr][0] = -sample->imag();
                m_samples[m_ptr][1] = sample->real();

                // advance write-pointer
                m_ptr = (m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder) % (HBFIRFilterTraits<HBFilterOrder>::hbOrder + 1);

                // next state
                m_state = 1;

                // tell caller we don't have a new sample
                return false;

            case 1:
                // insert sample into ring-buffer
                m_samples[m_ptr][0] = -sample->real();
                m_samples[m_ptr][1] = -sample->imag();

                // save result
                doFIR(sample);

                // advance write-pointer
                m_ptr = (m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder) % (HBFIRFilterTraits<HBFilterOrder>::hbOrder + 1);

                // next state
                m_state = 2;

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

            case 2:
                // insert sample into ring-buffer
                m_samples[m_ptr][0] = sample->imag();
                m_samples[m_ptr][1] = -sample->real();

                // advance write-pointer
                m_ptr = (m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder) % (HBFIRFilterTraits<HBFilterOrder>::hbOrder + 1);

                // next state
                m_state = 3;

                // tell caller we don't have a new sample
                return false;

            default:
                // insert sample into ring-buffer
                m_samples[m_ptr][0] = sample->real();
                m_samples[m_ptr][1] = sample->imag();

                // save result
                doFIR(sample);

                // advance write-pointer
                m_ptr = (m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder) % (HBFIRFilterTraits<HBFilterOrder>::hbOrder + 1);

                // next state
                m_state = 0;

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

workDecimateUpperHalf()

template<typename AccuType, uint32_t HBFilterOrder>

bool IntHalfbandFilter< AccuType, HBFilterOrder >::workDecimateUpperHalf ( Sample *  sample )

inline

Definition at line 443 of file inthalfbandfilter.h.

    {
        switch(m_state)
        {
            case 0:
                // insert sample into ring-buffer
                m_samples[m_ptr][0] = sample->imag();
                m_samples[m_ptr][1] = -sample->real();

                // advance write-pointer
                m_ptr = (m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder) % (HBFIRFilterTraits<HBFilterOrder>::hbOrder + 1);

                // next state
                m_state = 1;

                // tell caller we don't have a new sample
                return false;

            case 1:
                // insert sample into ring-buffer
                m_samples[m_ptr][0] = -sample->real();
                m_samples[m_ptr][1] = -sample->imag();

                // save result
                doFIR(sample);

                // advance write-pointer
                m_ptr = (m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder) % (HBFIRFilterTraits<HBFilterOrder>::hbOrder + 1);

                // next state
                m_state = 2;

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

            case 2:
                // insert sample into ring-buffer
                m_samples[m_ptr][0] = -sample->imag();
                m_samples[m_ptr][1] = sample->real();

                // advance write-pointer
                m_ptr = (m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder) % (HBFIRFilterTraits<HBFilterOrder>::hbOrder + 1);

                // next state
                m_state = 3;

                // tell caller we don't have a new sample
                return false;

            default:
                // insert sample into ring-buffer
                m_samples[m_ptr][0] = sample->real();
                m_samples[m_ptr][1] = sample->imag();

                // save result
                doFIR(sample);

                // advance write-pointer
                m_ptr = (m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder) % (HBFIRFilterTraits<HBFilterOrder>::hbOrder + 1);

                // next state
                m_state = 0;

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

workInterpolateCenter()

template<typename AccuType, uint32_t HBFilterOrder>

bool IntHalfbandFilter< AccuType, HBFilterOrder >::workInterpolateCenter ( Sample *  sampleIn, Sample *  SampleOut  )

inline

Optimized upsampler by 2 not calculating FIR with inserted null samples

Definition at line 117 of file inthalfbandfilter.h.

    {
        switch(m_state)
        {
        case 0:
            // return the middle peak
            SampleOut->setReal(m_samples[m_ptr + (HBFIRFilterTraits<HBFilterOrder>::hbOrder/4) - 1][0]);
            SampleOut->setImag(m_samples[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_samples[m_ptr][0] = sampleIn->real();
            m_samples[m_ptr][1] = sampleIn->imag();
            m_samples[m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder/2][0] = sampleIn->real();
            m_samples[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
        }
    }

workInterpolateCenterZeroStuffing()

template<typename AccuType, uint32_t HBFilterOrder>

bool IntHalfbandFilter< AccuType, HBFilterOrder >::workInterpolateCenterZeroStuffing ( Sample *  sampleIn, Sample *  SampleOut  )

inline

Definition at line 76 of file inthalfbandfilter.h.

    {
        switch(m_state)
        {
            case 0:
                // insert sample into ring-buffer
                m_samples[m_ptr][0] = 0;
                m_samples[m_ptr][1] = 0;

                // save result
                doFIR(SampleOut);

                // advance write-pointer
                m_ptr = (m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder) % (HBFIRFilterTraits<HBFilterOrder>::hbOrder + 1);

                // next state
                m_state = 1;

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

            default:
                // insert sample into ring-buffer
                m_samples[m_ptr][0] = sampleIn->real();
                m_samples[m_ptr][1] = sampleIn->imag();

                // save result
                doFIR(SampleOut);

                // advance write-pointer
                m_ptr = (m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder) % (HBFIRFilterTraits<HBFilterOrder>::hbOrder + 1);

                // next state
                m_state = 0;

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

workInterpolateLowerHalf()

template<typename AccuType, uint32_t HBFilterOrder>

bool IntHalfbandFilter< AccuType, HBFilterOrder >::workInterpolateLowerHalf ( Sample *  sampleIn, Sample *  sampleOut  )

inline

Optimized upsampler by 2 not calculating FIR with inserted null samples

Definition at line 376 of file inthalfbandfilter.h.

    {
        Sample s;

        switch(m_state)
        {
        case 0:
            // return the middle peak
            sampleOut->setReal(m_samples[m_ptr + (HBFIRFilterTraits<HBFilterOrder>::hbOrder/4) - 1][1]);  // imag
            sampleOut->setImag(-m_samples[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_samples[m_ptr][0] = sampleIn->real();
            m_samples[m_ptr][1] = sampleIn->imag();
            m_samples[m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder/2][0] = sampleIn->real();
            m_samples[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_samples[m_ptr + (HBFIRFilterTraits<HBFilterOrder>::hbOrder/4) - 1][1]);  // - imag
            sampleOut->setImag(m_samples[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_samples[m_ptr][0] = sampleIn->real();
            m_samples[m_ptr][1] = sampleIn->imag();
            m_samples[m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder/2][0] = sampleIn->real();
            m_samples[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
        }
    }

workInterpolateLowerHalfZeroStuffing()

template<typename AccuType, uint32_t HBFilterOrder>

bool IntHalfbandFilter< AccuType, HBFilterOrder >::workInterpolateLowerHalfZeroStuffing ( Sample *  sampleIn, Sample *  sampleOut  )

inline

Definition at line 291 of file inthalfbandfilter.h.

    {
        Sample s;

        switch(m_state)
        {
        case 0:
            // insert sample into ring-buffer
            m_samples[m_ptr][0] = 0;
            m_samples[m_ptr][1] = 0;

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

            // advance write-pointer
            m_ptr = (m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder) % (HBFIRFilterTraits<HBFilterOrder>::hbOrder + 1);

            // next state
            m_state = 1;

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

        case 1:
            // insert sample into ring-buffer
            m_samples[m_ptr][0] = sampleIn->real();
            m_samples[m_ptr][1] = sampleIn->imag();

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

            // advance write-pointer
            m_ptr = (m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder) % (HBFIRFilterTraits<HBFilterOrder>::hbOrder + 1);

            // next state
            m_state = 2;

            // tell caller we consumed the sample
            return true;

        case 2:
            // insert sample into ring-buffer
            m_samples[m_ptr][0] = 0;
            m_samples[m_ptr][1] = 0;

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

            // advance write-pointer
            m_ptr = (m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder) % (HBFIRFilterTraits<HBFilterOrder>::hbOrder + 1);

            // next state
            m_state = 3;

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

        default:
            // insert sample into ring-buffer
            m_samples[m_ptr][0] = sampleIn->real();
            m_samples[m_ptr][1] = sampleIn->imag();

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

            // advance write-pointer
            m_ptr = (m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder) % (HBFIRFilterTraits<HBFilterOrder>::hbOrder + 1);

            // next state
            m_state = 0;

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

workInterpolateUpperHalf()

template<typename AccuType, uint32_t HBFilterOrder>

bool IntHalfbandFilter< AccuType, HBFilterOrder >::workInterpolateUpperHalf ( Sample *  sampleIn, Sample *  sampleOut  )

inline

Optimized upsampler by 2 not calculating FIR with inserted null samples

Definition at line 597 of file inthalfbandfilter.h.

    {
        Sample s;

        switch(m_state)
        {
        case 0:
            // return the middle peak
            sampleOut->setReal(-m_samples[m_ptr + (HBFIRFilterTraits<HBFilterOrder>::hbOrder/4) - 1][1]); // - imag
            sampleOut->setImag(m_samples[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_samples[m_ptr][0] = sampleIn->real();
            m_samples[m_ptr][1] = sampleIn->imag();
            m_samples[m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder/2][0] = sampleIn->real();
            m_samples[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_samples[m_ptr + (HBFIRFilterTraits<HBFilterOrder>::hbOrder/4) - 1][1]);  // + imag
            sampleOut->setImag(-m_samples[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_samples[m_ptr][0] = sampleIn->real();
            m_samples[m_ptr][1] = sampleIn->imag();
            m_samples[m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder/2][0] = sampleIn->real();
            m_samples[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
        }
    }

workInterpolateUpperHalfZeroStuffing()

template<typename AccuType, uint32_t HBFilterOrder>

bool IntHalfbandFilter< AccuType, HBFilterOrder >::workInterpolateUpperHalfZeroStuffing ( Sample *  sampleIn, Sample *  sampleOut  )

inline

Definition at line 512 of file inthalfbandfilter.h.

    {
        Sample s;

        switch(m_state)
        {
        case 0:
            // insert sample into ring-buffer
            m_samples[m_ptr][0] = 0;
            m_samples[m_ptr][1] = 0;

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

            // advance write-pointer
            m_ptr = (m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder) % (HBFIRFilterTraits<HBFilterOrder>::hbOrder + 1);

            // next state
            m_state = 1;

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

        case 1:
            // insert sample into ring-buffer
            m_samples[m_ptr][0] = sampleIn->real();
            m_samples[m_ptr][1] = sampleIn->imag();

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

            // advance write-pointer
            m_ptr = (m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder) % (HBFIRFilterTraits<HBFilterOrder>::hbOrder + 1);

            // next state
            m_state = 2;

            // tell caller we consumed the sample
            return true;

        case 2:
            // insert sample into ring-buffer
            m_samples[m_ptr][0] = 0;
            m_samples[m_ptr][1] = 0;

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

            // advance write-pointer
            m_ptr = (m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder) % (HBFIRFilterTraits<HBFilterOrder>::hbOrder + 1);

            // next state
            m_state = 3;

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

        default:
            // insert sample into ring-buffer
            m_samples[m_ptr][0] = sampleIn->real();
            m_samples[m_ptr][1] = sampleIn->imag();

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

            // advance write-pointer
            m_ptr = (m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder) % (HBFIRFilterTraits<HBFilterOrder>::hbOrder + 1);

            // next state
            m_state = 0;

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

Member Data Documentation

m_ptr

template<typename AccuType, uint32_t HBFilterOrder>

qint16 IntHalfbandFilter< AccuType, HBFilterOrder >::m_ptr

protected

Definition at line 785 of file inthalfbandfilter.h.

m_samples

template<typename AccuType, uint32_t HBFilterOrder>

AccuType IntHalfbandFilter< AccuType, HBFilterOrder >::m_samples[HBFIRFilterTraits< HBFilterOrder >::hbOrder+1][2]

protected

Definition at line 784 of file inthalfbandfilter.h.

m_state

template<typename AccuType, uint32_t HBFilterOrder>

int IntHalfbandFilter< AccuType, HBFilterOrder >::m_state

protected

Definition at line 786 of file inthalfbandfilter.h.

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

• sdrbase/dsp/inthalfbandfilter.h