IntHalfbandFilterDBF< AccuType, SampleType, HBFilterOrder > Class Template Reference

#include <inthalfbandfilterdbf.h>

Public Member Functions
	IntHalfbandFilterDBF ()
void	myDecimate (AccuType x1, AccuType y1, AccuType *x2, AccuType *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	storeSample (AccuType x, AccuType y)
void	advancePointer ()
void	doFIR (AccuType *x, AccuType *y)
void	doInterpolateFIR (qint32 *x, qint32 *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 IntHalfbandFilterDBF< AccuType, SampleType, HBFilterOrder >

Definition at line 31 of file inthalfbandfilterdbf.h.

Constructor & Destructor Documentation

IntHalfbandFilterDBF()

template<typename AccuType , typename SampleType , uint32_t HBFilterOrder>

IntHalfbandFilterDBF< AccuType, SampleType, HBFilterOrder >::IntHalfbandFilterDBF

(

)

Definition at line 165 of file inthalfbandfilterdbf.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 IntHalfbandFilterDBF< AccuType, SampleType, HBFilterOrder >::advancePointer ( )

inlineprotected

Definition at line 115 of file inthalfbandfilterdbf.h.

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

doFIR()

template<typename AccuType , typename SampleType , uint32_t HBFilterOrder>

void IntHalfbandFilterDBF< AccuType, SampleType, HBFilterOrder >::doFIR ( AccuType *  x, AccuType *  y  )

inlineprotected

Definition at line 120 of file inthalfbandfilterdbf.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()

template<typename AccuType , typename SampleType , uint32_t HBFilterOrder>

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

inlineprotected

Definition at line 142 of file inthalfbandfilterdbf.h.

References i, and SDR_RX_SCALED.

    {
        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 * SDR_RX_SCALED;
        *y = qAcc * SDR_RX_SCALED;
    }

myDecimate()

template<typename AccuType , typename SampleType , uint32_t HBFilterOrder>

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

inline

Definition at line 35 of file inthalfbandfilterdbf.h.

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

        storeSample(*x2, *y2);
        doFIR(x2, y2);
        advancePointer();
    }

myInterpolate()

template<typename AccuType , typename SampleType , uint32_t HBFilterOrder>

void IntHalfbandFilterDBF< 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 46 of file inthalfbandfilterdbf.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 IntHalfbandFilterDBF< AccuType, SampleType, HBFilterOrder >::myInterpolateInf ( qint32 *  x1, qint32 *  y1, qint32 *  x2, qint32 *  y2, qint32 *  x3, qint32 *  y3, qint32 *  x4, qint32 *  y4  )

inline

Definition at line 69 of file inthalfbandfilterdbf.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 IntHalfbandFilterDBF< AccuType, SampleType, HBFilterOrder >::myInterpolateSup ( qint32 *  x1, qint32 *  y1, qint32 *  x2, qint32 *  y2, qint32 *  x3, qint32 *  y3, qint32 *  x4, qint32 *  y4  )

inline

Definition at line 85 of file inthalfbandfilterdbf.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;
    }

storeSample()

template<typename AccuType , typename SampleType , uint32_t HBFilterOrder>

void IntHalfbandFilterDBF< AccuType, SampleType, HBFilterOrder >::storeSample ( AccuType  x, AccuType  y  )

inlineprotected

Definition at line 107 of file inthalfbandfilterdbf.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;
    }

Member Data Documentation

m_ptr

template<typename AccuType , typename SampleType , uint32_t HBFilterOrder>

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

protected

Definition at line 103 of file inthalfbandfilterdbf.h.

m_samplesDB

template<typename AccuType , typename SampleType , uint32_t HBFilterOrder>

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

protected

Definition at line 102 of file inthalfbandfilterdbf.h.

m_size

template<typename AccuType , typename SampleType , uint32_t HBFilterOrder>

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

protected

Definition at line 104 of file inthalfbandfilterdbf.h.

m_state

template<typename AccuType , typename SampleType , uint32_t HBFilterOrder>

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

protected

Definition at line 105 of file inthalfbandfilterdbf.h.

---

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

• sdrbase/dsp/inthalfbandfilterdbf.h