Decimator Class Reference

#include <Decimator.h>

Public Member Functions
	Decimator (unsigned int inLength, unsigned int decFactor)
virtual	~Decimator ()
void	process (const double *src, double *dst)
void	process (const float *src, float *dst)
int	getFactor () const
void	resetFilter ()

Static Public Member Functions
static int	getHighestSupportedFactor ()

Private Member Functions
void	deInitialise ()
void	initialise (unsigned int inLength, unsigned int decFactor)
void	doAntiAlias (const double *src, double *dst, unsigned int length)
void	doAntiAlias (const float *src, double *dst, unsigned int length)

Private Attributes
unsigned int	m_inputLength
unsigned int	m_outputLength
unsigned int	m_decFactor
double	Input
double	Output
double	o1
double	o2
double	o3
double	o4
double	o5
double	o6
double	o7
double	a [9]
double	b [9]
double *	decBuffer

Detailed Description

Decimator carries out a fast downsample by a power-of-two factor. Only a limited number of factors are supported, from two to whatever getHighestSupportedFactor() returns. This is much faster than Resampler but has a worse signal-noise ratio.

Definition at line 24 of file Decimator.h.

Constructor & Destructor Documentation

Decimator()

Decimator::Decimator	(	unsigned int	inLength,
		unsigned int	decFactor
	)

Construct a Decimator 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. The highest supported factor is obtained through getHighestSupportedFactor(); for higher factors, you will need to chain more than one decimator.

~Decimator()

virtual Decimator::~Decimator ( )

virtual

Member Function Documentation

deInitialise()

void Decimator::deInitialise ( )

private

doAntiAlias() [1/2]

void Decimator::doAntiAlias ( const double *  src, double *  dst, unsigned int  length  )

private

doAntiAlias() [2/2]

void Decimator::doAntiAlias ( const float *  src, double *  dst, unsigned int  length  )

private

getFactor()

int Decimator::getFactor ( ) const

inline

Definition at line 56 of file Decimator.h.

getHighestSupportedFactor()

static int Decimator::getHighestSupportedFactor ( )

inlinestatic

Definition at line 57 of file Decimator.h.

initialise()

void Decimator::initialise ( unsigned int  inLength, unsigned int  decFactor  )

private

process() [1/2]

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

Process inLength samples (as supplied to constructor) from src and write inLength / decFactor samples to dst. Note that src and dst may be the same or overlap (an intermediate buffer is used).

process() [2/2]

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

Process inLength samples (as supplied to constructor) from src and write inLength / decFactor samples to dst. Note that src and dst may be the same or overlap (an intermediate buffer is used).

resetFilter()

void Decimator::resetFilter

(

)

Member Data Documentation

a

double Decimator::a[9]

private

Definition at line 76 of file Decimator.h.

b

double Decimator::b[9]

private

Definition at line 77 of file Decimator.h.

decBuffer

double* Decimator::decBuffer

private

Definition at line 79 of file Decimator.h.

Input

double Decimator::Input

private

Definition at line 71 of file Decimator.h.

m_decFactor

unsigned int Decimator::m_decFactor

private

Definition at line 69 of file Decimator.h.

m_inputLength

unsigned int Decimator::m_inputLength

private

Definition at line 67 of file Decimator.h.

m_outputLength

unsigned int Decimator::m_outputLength

private

Definition at line 68 of file Decimator.h.

o1

double Decimator::o1

private

Definition at line 74 of file Decimator.h.

o2

double Decimator::o2

private

Definition at line 74 of file Decimator.h.

o3

double Decimator::o3

private

Definition at line 74 of file Decimator.h.

o4

double Decimator::o4

private

Definition at line 74 of file Decimator.h.

o5

double Decimator::o5

private

Definition at line 74 of file Decimator.h.

o6

double Decimator::o6

private

Definition at line 74 of file Decimator.h.

o7

double Decimator::o7

private

Definition at line 74 of file Decimator.h.

Output

double Decimator::Output

private

Definition at line 72 of file Decimator.h.

---

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

• Decimator.h