HBFilterChainConverter Class Reference

#include <hbfilterchainconverter.h>

Static Public Member Functions
static double	convertToIndexes (unsigned int log2, unsigned int chainHash, std::vector< unsigned int > &chainIndexes)
static double	convertToString (unsigned int log2, unsigned int chainHash, QString &chainString)
static double	getShiftFactor (unsigned int log2, unsigned int chainHash)

Detailed Description

Definition at line 27 of file hbfilterchainconverter.h.

Member Function Documentation

convertToIndexes()

double HBFilterChainConverter::convertToIndexes ( unsigned int  log2, unsigned int  chainHash, std::vector< unsigned int > &  chainIndexes  )

static

Definition at line 22 of file hbfilterchainconverter.cpp.

References i.

Referenced by DownChannelizer::applySetting(), and UpChannelizer::applySetting().

{
    chainIndexes.clear();

    if (log2 == 0) {
        return 0.0;
    }

    unsigned int s = 1;
    unsigned int u = chainHash;

    for (unsigned int i = 0; i < log2; i++) {
        s *= 3;
    }

    u %= s; // scale
    unsigned int ix = log2;
    double shift = 0.0;
    double shift_stage = 1.0 / (1<<(log2+1));

    // base3 conversion
    do
    {
        int r = u % 3;
        chainIndexes.push_back(r);
        shift += (r-1)*shift_stage;
        shift_stage *= 2;
        u /= 3;
        ix--;
    } while (u);

    // continue shift with leading zeroes. ix has the number of leading zeroes.
    for (unsigned int i = 0; i < ix; i++)
    {
        chainIndexes.push_back(0);
        shift -= shift_stage;
        shift_stage *= 2;
    }

    return shift;
}

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convertToString()

double HBFilterChainConverter::convertToString ( unsigned int  log2, unsigned int  chainHash, QString &  chainString  )

static

Definition at line 64 of file hbfilterchainconverter.cpp.

References i.

Referenced by LocalSinkGUI::applyPosition(), LocalSourceGUI::applyPosition(), RemoteSinkGUI::applyPosition(), and FileSourceGUI::applyPosition().

{
    if (log2 == 0)
    {
        chainString = "C";
        return 0.0;
    }

    unsigned int s = 1;
    unsigned int u = chainHash;
    chainString = "";

    for (unsigned int i = 0; i < log2; i++) {
        s *= 3;
    }

    u %= s; // scale
    unsigned int ix = log2;
    double shift = 0.0;
    double shift_stage = 1.0 / (1<<(log2+1));

    // base3 conversion
    do
    {
        int r = u % 3;

        if (r == 0) {
            chainString = "L" + chainString;
        } else if (r == 1) {
            chainString = "C" + chainString;
        } else if (r == 2) {
            chainString = "H" + chainString;
        }

        shift += (r-1)*shift_stage;
        shift_stage *= 2;
        u /= 3;
        ix--;
    } while (u);

    // continue shift with leading zeroes. ix has the number of leading zeroes.
    for (unsigned int i = 0; i < ix; i++)
    {
        chainString = "L" + chainString;
        shift -= shift_stage;
        shift_stage *= 2;
    }

    return shift;
}

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getShiftFactor()

double HBFilterChainConverter::getShiftFactor ( unsigned int  log2, unsigned int  chainHash  )

static

Definition at line 115 of file hbfilterchainconverter.cpp.

References i.

Referenced by LocalSink::calculateFrequencyOffset(), LocalSource::calculateFrequencyOffset(), RemoteSink::calculateFrequencyOffset(), and FileSource::calculateFrequencyOffset().

{
    if (log2 == 0)
    {
        return 0.0;
    }

    unsigned int s = 1;
    unsigned int u = chainHash;

    for (unsigned int i = 0; i < log2; i++) {
        s *= 3;
    }

    u %= s; // scale
    unsigned int ix = log2;
    double shift = 0.0;
    double shift_stage = 1.0 / (1<<(log2+1));

    // base3 conversion
    do
    {
        int r = u % 3;
        shift += (r-1)*shift_stage;
        shift_stage *= 2;
        u /= 3;
        ix--;
    } while (u);

    // continue shift with leading zeroes. ix has the number of leading zeroes.
    for (unsigned int i = 0; i < ix; i++)
    {
        shift -= shift_stage;
        shift_stage *= 2;
    }

    return shift;
}

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

• sdrbase/dsp/hbfilterchainconverter.h
• sdrbase/dsp/hbfilterchainconverter.cpp