IntHalfbandFilterEOF< HBFilterOrder > Class Template Reference

#include <inthalfbandfiltereof.h>

Public Member Functions
	IntHalfbandFilterEOF ()
bool	workDecimateCenter (float *x, float *y)
void	myDecimate (float x1, float y1, float *x2, float *y2)
void	myInterpolateZeroStuffing (float *x1, float *y1, float *x2, float *y2)
void	myInterpolate (float *x1, float *y1, float *x2, float *y2)
void	myInterpolateInf (float *x1, float *y1, float *x2, float *y2, float *x3, float *y3, float *x4, float *y4)
void	myInterpolateSup (float *x1, float *y1, float *x2, float *y2, float *x3, float *y3, float *x4, float *y4)

Protected Member Functions
void	storeSample (float x, float y)
void	advancePointer ()
void	doFIR (float *x, float *y)
void	doInterpolateFIR (float *x, float *y)

Protected Attributes
float	m_even [2][HBFIRFilterTraits< HBFilterOrder >::hbOrder]
float	m_odd [2][HBFIRFilterTraits< HBFilterOrder >::hbOrder]
float	m_samples [HBFIRFilterTraits< HBFilterOrder >::hbOrder][2]
int	m_ptr
int	m_size
int	m_state

Detailed Description

template<uint32_t HBFilterOrder>
class IntHalfbandFilterEOF< HBFilterOrder >

Definition at line 33 of file inthalfbandfiltereof.h.

Constructor & Destructor Documentation

IntHalfbandFilterEOF()

template<uint32_t HBFilterOrder>

IntHalfbandFilterEOF< HBFilterOrder >::IntHalfbandFilterEOF

(

)

Definition at line 237 of file inthalfbandfiltereof.h.

{
    m_size = HBFIRFilterTraits<HBFilterOrder>::hbOrder/2;

    for (int i = 0; i < 2*m_size; i++)
    {
        m_even[0][i] = 0.0f;
        m_even[1][i] = 0.0f;
        m_odd[0][i] = 0.0f;
        m_odd[1][i] = 0.0f;
        m_samples[i][0] = 0.0f;
        m_samples[i][1] = 0.0f;
    }

    m_ptr = 0;
    m_state = 0;
}

Member Function Documentation

advancePointer()

template<uint32_t HBFilterOrder>

void IntHalfbandFilterEOF< HBFilterOrder >::advancePointer ( )

inlineprotected

Definition at line 169 of file inthalfbandfiltereof.h.

Referenced by IntHalfbandFilterEOF< DECIMATORS_IF_FILTER_ORDER >::myDecimate(), IntHalfbandFilterEOF< DECIMATORS_IF_FILTER_ORDER >::myInterpolateZeroStuffing(), and IntHalfbandFilterEOF< DECIMATORS_IF_FILTER_ORDER >::workDecimateCenter().

    {
        m_ptr = m_ptr + 1 < 2*m_size ? m_ptr + 1: 0;
    }

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doFIR()

template<uint32_t HBFilterOrder>

void IntHalfbandFilterEOF< HBFilterOrder >::doFIR ( float *  x, float *  y  )

inlineprotected

Definition at line 174 of file inthalfbandfiltereof.h.

Referenced by IntHalfbandFilterEOF< DECIMATORS_IF_FILTER_ORDER >::myDecimate(), IntHalfbandFilterEOF< DECIMATORS_IF_FILTER_ORDER >::myInterpolateZeroStuffing(), and IntHalfbandFilterEOF< DECIMATORS_IF_FILTER_ORDER >::workDecimateCenter().

    {
        float iAcc = 0;
        float qAcc = 0;

        int a = m_ptr/2 + m_size; // tip pointer
        int b = m_ptr/2 + 1; // tail pointer

        for (int i = 0; i < HBFIRFilterTraits<HBFilterOrder>::hbOrder / 4; i++)
        {
            if ((m_ptr % 2) == 0)
            {
                iAcc += (m_even[0][a] + m_even[0][b]) * HBFIRFilterTraits<HBFilterOrder>::hbCoeffsF[i];
                qAcc += (m_even[1][a] + m_even[1][b]) * HBFIRFilterTraits<HBFilterOrder>::hbCoeffsF[i];
            }
            else
            {
                iAcc += (m_odd[0][a] + m_odd[0][b]) * HBFIRFilterTraits<HBFilterOrder>::hbCoeffsF[i];
                qAcc += (m_odd[1][a] + m_odd[1][b]) * HBFIRFilterTraits<HBFilterOrder>::hbCoeffsF[i];
            }

            a -= 1;
            b += 1;
        }

        if ((m_ptr % 2) == 0)
        {
            iAcc += m_odd[0][m_ptr/2 + m_size/2] * 0.5f;
            qAcc += m_odd[1][m_ptr/2 + m_size/2] * 0.5f;
        }
        else
        {
            iAcc += m_even[0][m_ptr/2 + m_size/2 + 1] * 0.5f;
            qAcc += m_even[1][m_ptr/2 + m_size/2 + 1] * 0.5f;
        }

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

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doInterpolateFIR()

template<uint32_t HBFilterOrder>

void IntHalfbandFilterEOF< HBFilterOrder >::doInterpolateFIR ( float *  x, float *  y  )

inlineprotected

Definition at line 214 of file inthalfbandfiltereof.h.

Referenced by IntHalfbandFilterEOF< DECIMATORS_IF_FILTER_ORDER >::myInterpolate().

    {
        qint32 iAcc = 0;
        qint32 qAcc = 0;

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

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

        *x = iAcc * SDR_RX_SCALED;
        *y = qAcc * SDR_RX_SCALED;
    }

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myDecimate()

template<uint32_t HBFilterOrder>

void IntHalfbandFilterEOF< HBFilterOrder >::myDecimate ( float  x1, float  y1, float *  x2, float *  y2  )

inline

Definition at line 64 of file inthalfbandfiltereof.h.

Referenced by DecimatorsFF::decimate16_cen(), DecimatorsFI::decimate16_cen(), DecimatorsFI::decimate16_inf(), DecimatorsFF::decimate16_inf(), DecimatorsFF::decimate16_sup(), DecimatorsFI::decimate16_sup(), DecimatorsFF::decimate2_cen(), DecimatorsFI::decimate2_cen(), DecimatorsFF::decimate32_cen(), DecimatorsFI::decimate32_cen(), DecimatorsFI::decimate32_inf(), DecimatorsFF::decimate32_inf(), DecimatorsFI::decimate32_sup(), DecimatorsFF::decimate32_sup(), DecimatorsFF::decimate4_cen(), DecimatorsFI::decimate4_cen(), DecimatorsFI::decimate64_cen(), DecimatorsFF::decimate64_cen(), DecimatorsFF::decimate64_inf(), DecimatorsFI::decimate64_inf(), DecimatorsFI::decimate64_sup(), DecimatorsFF::decimate64_sup(), DecimatorsFI::decimate8_cen(), DecimatorsFF::decimate8_cen(), DecimatorsFI::decimate8_inf(), DecimatorsFF::decimate8_inf(), DecimatorsFI::decimate8_sup(), and DecimatorsFF::decimate8_sup().

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

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

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myInterpolate()

template<uint32_t HBFilterOrder>

void IntHalfbandFilterEOF< HBFilterOrder >::myInterpolate ( float *  x1, float *  y1, float *  x2, float *  y2  )

inline

Optimized upsampler by 2 not calculating FIR with inserted null samples

Definition at line 87 of file inthalfbandfiltereof.h.

Referenced by IntHalfbandFilterEOF< DECIMATORS_IF_FILTER_ORDER >::myInterpolateInf(), and IntHalfbandFilterEOF< DECIMATORS_IF_FILTER_ORDER >::myInterpolateSup().

    {
        // 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);
    }

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myInterpolateInf()

template<uint32_t HBFilterOrder>

void IntHalfbandFilterEOF< HBFilterOrder >::myInterpolateInf ( float *  x1, float *  y1, float *  x2, float *  y2, float *  x3, float *  y3, float *  x4, float *  y4  )

inline

Definition at line 110 of file inthalfbandfiltereof.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<uint32_t HBFilterOrder>

void IntHalfbandFilterEOF< HBFilterOrder >::myInterpolateSup ( float *  x1, float *  y1, float *  x2, float *  y2, float *  x3, float *  y3, float *  x4, float *  y4  )

inline

Definition at line 126 of file inthalfbandfiltereof.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<uint32_t HBFilterOrder>

void IntHalfbandFilterEOF< HBFilterOrder >::myInterpolateZeroStuffing ( float *  x1, float *  y1, float *  x2, float *  y2  )

inline

Simple zero stuffing and filter

Definition at line 75 of file inthalfbandfiltereof.h.

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

        storeSample(0, 0);
        doFIR(x2, y2);
        advancePointer();
    }

storeSample()

template<uint32_t HBFilterOrder>

void IntHalfbandFilterEOF< HBFilterOrder >::storeSample ( float  x, float  y  )

inlineprotected

Definition at line 151 of file inthalfbandfiltereof.h.

Referenced by IntHalfbandFilterEOF< DECIMATORS_IF_FILTER_ORDER >::myDecimate(), IntHalfbandFilterEOF< DECIMATORS_IF_FILTER_ORDER >::myInterpolateZeroStuffing(), and IntHalfbandFilterEOF< DECIMATORS_IF_FILTER_ORDER >::workDecimateCenter().

    {
        if ((m_ptr % 2) == 0)
        {
            m_even[0][m_ptr/2] = x;
            m_even[1][m_ptr/2] = y;
            m_even[0][m_ptr/2 + m_size] = x;
            m_even[1][m_ptr/2 + m_size] = y;
        }
        else
        {
            m_odd[0][m_ptr/2] = x;
            m_odd[1][m_ptr/2] = y;
            m_odd[0][m_ptr/2 + m_size] = x;
            m_odd[1][m_ptr/2 + m_size] = y;
        }
    }

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workDecimateCenter()

template<uint32_t HBFilterOrder>

bool IntHalfbandFilterEOF< HBFilterOrder >::workDecimateCenter ( float *  x, float *  y  )

inline

Definition at line 37 of file inthalfbandfiltereof.h.

    {
        // insert sample into ring-buffer
        storeSample(*x, *y);

        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(x, y);
                // advance write-pointer
                advancePointer();
                // next state
                m_state = 0;
                // tell caller we have a new sample
                return true;
        }
    }

Member Data Documentation

m_even

template<uint32_t HBFilterOrder>

float IntHalfbandFilterEOF< HBFilterOrder >::m_even[2][HBFIRFilterTraits< HBFilterOrder >::hbOrder]

protected

Definition at line 143 of file inthalfbandfiltereof.h.

Referenced by IntHalfbandFilterEOF< DECIMATORS_IF_FILTER_ORDER >::IntHalfbandFilterEOF().

m_odd

template<uint32_t HBFilterOrder>

float IntHalfbandFilterEOF< HBFilterOrder >::m_odd[2][HBFIRFilterTraits< HBFilterOrder >::hbOrder]

protected

Definition at line 144 of file inthalfbandfiltereof.h.

Referenced by IntHalfbandFilterEOF< DECIMATORS_IF_FILTER_ORDER >::IntHalfbandFilterEOF().

m_ptr

template<uint32_t HBFilterOrder>

int IntHalfbandFilterEOF< HBFilterOrder >::m_ptr

protected

Definition at line 147 of file inthalfbandfiltereof.h.

Referenced by IntHalfbandFilterEOF< DECIMATORS_IF_FILTER_ORDER >::doInterpolateFIR(), IntHalfbandFilterEOF< DECIMATORS_IF_FILTER_ORDER >::IntHalfbandFilterEOF(), and IntHalfbandFilterEOF< DECIMATORS_IF_FILTER_ORDER >::myInterpolate().

m_samples

template<uint32_t HBFilterOrder>

float IntHalfbandFilterEOF< HBFilterOrder >::m_samples[HBFIRFilterTraits< HBFilterOrder >::hbOrder][2]

protected

Definition at line 145 of file inthalfbandfiltereof.h.

Referenced by IntHalfbandFilterEOF< DECIMATORS_IF_FILTER_ORDER >::IntHalfbandFilterEOF(), and IntHalfbandFilterEOF< DECIMATORS_IF_FILTER_ORDER >::myInterpolate().

m_size

template<uint32_t HBFilterOrder>

int IntHalfbandFilterEOF< HBFilterOrder >::m_size

protected

Definition at line 148 of file inthalfbandfiltereof.h.

Referenced by IntHalfbandFilterEOF< DECIMATORS_IF_FILTER_ORDER >::doFIR(), IntHalfbandFilterEOF< DECIMATORS_IF_FILTER_ORDER >::IntHalfbandFilterEOF(), and IntHalfbandFilterEOF< DECIMATORS_IF_FILTER_ORDER >::storeSample().

m_state

template<uint32_t HBFilterOrder>

int IntHalfbandFilterEOF< HBFilterOrder >::m_state

protected

Definition at line 149 of file inthalfbandfiltereof.h.

Referenced by IntHalfbandFilterEOF< DECIMATORS_IF_FILTER_ORDER >::IntHalfbandFilterEOF(), and IntHalfbandFilterEOF< DECIMATORS_IF_FILTER_ORDER >::workDecimateCenter().

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

• sdrbase/dsp/inthalfbandfiltereof.h