QM-DSP

qm-dsp 1.8

DecimatorB carries out a fast downsample by a power-of-two factor. More...

#include <DecimatorB.h>

Public Member Functions
void	process (const double src, double dst)

void	process (const float src, float dst)

	DecimatorB (int inLength, int decFactor)
	Construct a DecimatorB to operate on input blocks of length inLength, with decimation factor decFactor. More...

virtual	~DecimatorB ()

int	getFactor () const

Private Member Functions
void	deInitialise ()

void	initialise (int inLength, int decFactor)

void	doAntiAlias (const double src, double dst, int length, int filteridx)

void	doProcess ()

Private Attributes
int	m_inputLength

int	m_outputLength

int	m_decFactor

std::vector< std::vector< double > >	m_o

double	m_a [7]

double	m_b [7]

double *	m_aaBuffer

double *	m_tmpBuffer

Detailed Description

DecimatorB carries out a fast downsample by a power-of-two factor.

It only knows how to decimate by a factor of 2, and will use repeated decimation for higher factors. A Butterworth filter of order 6 is used for the lowpass filter.

Definition at line 25 of file DecimatorB.h.

Constructor & Destructor Documentation

DecimatorB::DecimatorB	(	int	inLength,
		int	decFactor
	)

Construct a DecimatorB to operate on input blocks of length inLength, with decimation factor decFactor.

inLength should be a multiple of decFactor. Output blocks will be of length inLength / decFactor.

decFactor must be a power of two.

Definition at line 23 of file DecimatorB.cpp.

References initialise(), m_aaBuffer, m_decFactor, m_inputLength, m_outputLength, and m_tmpBuffer.

DecimatorB::~DecimatorB ( )

virtual

Definition at line 34 of file DecimatorB.cpp.

References deInitialise().

Member Function Documentation

void DecimatorB::process	(	const double *	src,
		double *	dst
	)

Definition at line 131 of file DecimatorB.cpp.

References doProcess(), m_decFactor, m_inputLength, m_outputLength, and m_tmpBuffer.

void DecimatorB::process	(	const float *	src,
		float *	dst
	)

Definition at line 146 of file DecimatorB.cpp.

References doProcess(), m_decFactor, m_inputLength, m_outputLength, and m_tmpBuffer.

int DecimatorB::getFactor ( ) const

inline

Definition at line 42 of file DecimatorB.h.

References deInitialise(), doAntiAlias(), doProcess(), initialise(), and m_decFactor.

void DecimatorB::deInitialise ( )

private

Definition at line 84 of file DecimatorB.cpp.

References m_aaBuffer, and m_tmpBuffer.

Referenced by getFactor(), and ~DecimatorB().

void DecimatorB::initialise	(	int	inLength,
		int	decFactor
	)

private

Definition at line 39 of file DecimatorB.cpp.

References MathUtilities::isPowerOfTwo(), m_a, m_aaBuffer, m_b, m_decFactor, m_inputLength, m_o, m_outputLength, and m_tmpBuffer.

Referenced by DecimatorB(), and getFactor().

void DecimatorB::doAntiAlias	(	const double *	src,
		double *	dst,
		int	length,
		int	filteridx
	)

private

Definition at line 90 of file DecimatorB.cpp.

References m_a, m_b, and m_o.

Referenced by doProcess(), and getFactor().

void DecimatorB::doProcess ( )

private

Definition at line 111 of file DecimatorB.cpp.

References doAntiAlias(), m_aaBuffer, m_decFactor, m_inputLength, and m_tmpBuffer.

Referenced by getFactor(), and process().

Member Data Documentation

int DecimatorB::m_inputLength

private

Definition at line 50 of file DecimatorB.h.

Referenced by DecimatorB(), doProcess(), initialise(), and process().

int DecimatorB::m_outputLength

private

Definition at line 51 of file DecimatorB.h.

Referenced by DecimatorB(), initialise(), and process().

int DecimatorB::m_decFactor

private

Definition at line 52 of file DecimatorB.h.

Referenced by DecimatorB(), doProcess(), getFactor(), initialise(), and process().

std::vector<std::vector<double> > DecimatorB::m_o

private

Definition at line 54 of file DecimatorB.h.

Referenced by doAntiAlias(), and initialise().

double DecimatorB::m_a[7]

private

Definition at line 56 of file DecimatorB.h.

Referenced by doAntiAlias(), and initialise().

double DecimatorB::m_b[7]

private

Definition at line 57 of file DecimatorB.h.

Referenced by doAntiAlias(), and initialise().

double* DecimatorB::m_aaBuffer

private

Definition at line 59 of file DecimatorB.h.

Referenced by DecimatorB(), deInitialise(), doProcess(), and initialise().

double* DecimatorB::m_tmpBuffer

private

Definition at line 60 of file DecimatorB.h.

Referenced by DecimatorB(), deInitialise(), doProcess(), initialise(), and process().

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