DecimatorB Class Reference

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.
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::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::~DecimatorB ( )

virtual

Definition at line 34 of file DecimatorB.cpp.

References deInitialise().

Member Function Documentation

process() [1/2]

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

Definition at line 132 of file DecimatorB.cpp.

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

process() [2/2]

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

Definition at line 147 of file DecimatorB.cpp.

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

getFactor()

int DecimatorB::getFactor ( ) const

inline

Definition at line 42 of file DecimatorB.h.

References m_decFactor.

deInitialise()

void DecimatorB::deInitialise ( )

private

Definition at line 84 of file DecimatorB.cpp.

References m_aaBuffer, and m_tmpBuffer.

Referenced by ~DecimatorB().

initialise()

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().

doAntiAlias()

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().

doProcess()

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 process(), and process().

Member Data Documentation

m_inputLength

int DecimatorB::m_inputLength

private

Definition at line 50 of file DecimatorB.h.

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

m_outputLength

int DecimatorB::m_outputLength

private

Definition at line 51 of file DecimatorB.h.

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

m_decFactor

int DecimatorB::m_decFactor

private

Definition at line 52 of file DecimatorB.h.

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

m_o

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

private

Definition at line 54 of file DecimatorB.h.

Referenced by doAntiAlias(), and initialise().

m_a

double DecimatorB::m_a[7]

private

Definition at line 56 of file DecimatorB.h.

Referenced by doAntiAlias(), and initialise().

m_b

double DecimatorB::m_b[7]

private

Definition at line 57 of file DecimatorB.h.

Referenced by doAntiAlias(), and initialise().

m_aaBuffer

double* DecimatorB::m_aaBuffer

private

Definition at line 59 of file DecimatorB.h.

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

m_tmpBuffer

double* DecimatorB::m_tmpBuffer

private

Definition at line 60 of file DecimatorB.h.

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

---

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

• DecimatorB.h
• DecimatorB.cpp