r8b::CDSPFracDelayFilterBank Class Reference

Sinc function-based fractional delay filter bank class. More...

#include <CDSPFracInterpolator.h>

Inheritance diagram for r8b::CDSPFracDelayFilterBank:

Public Member Functions
	CDSPFracDelayFilterBank (const int aFilterFracs, const int aElementSize, const int aInterpPoints, const double aReqAtten, const bool aIsThird)
int	getFilterFracs () const
int	getFilterLen () const
const double &	operator[] (const int i) const
void	unref ()

Static Public Member Functions
static void	roundReqAtten (double &att, const bool aIsThird)

Friends
class	CDSPFracDelayFilterBankCache

Detailed Description

Sinc function-based fractional delay filter bank class.

Class implements storage and initialization of a bank of sinc-based fractional delay filters, expressed as 0th, 1st, 2nd or 3rd order polynomial interpolation coefficients. The filters are windowed by the "Kaiser" power-raised window function.

Constructor & Destructor Documentation

CDSPFracDelayFilterBank()

r8b::CDSPFracDelayFilterBank::CDSPFracDelayFilterBank	(	const int	aFilterFracs,
		const int	aElementSize,
		const int	aInterpPoints,
		const double	aReqAtten,
		const bool	aIsThird
	)

Constructor.

Parameters

aFilterFracs	The number of fractional delay positions to sample, -1 - use default.
aElementSize	The size of each filter's tap, in "double" values. This parameter corresponds to the complexity of interpolation. 4 should be set for 3rd order, 3 for 2nd order, 2 for linear interpolation, 1 for whole-numbered stepping.
aInterpPoints	The number of points the interpolation is based on. This value should not be confused with the ElementSize. Set to 2 for linear or no interpolation.
aReqAtten	Required filter attentuation.
aIsThird	"True" if one-third filter is required.

Member Function Documentation

getFilterFracs()

int r8b::CDSPFracDelayFilterBank::getFilterFracs

(

)

const

Returns

The number of fractional positions sampled by the bank.

getFilterLen()

int r8b::CDSPFracDelayFilterBank::getFilterLen

(

)

const

Returns

The length of the filter, in samples (taps). Always an even number, not less than 6.

operator[]()

const double & r8b::CDSPFracDelayFilterBank::operator[]

(

const int

i

)

const

Parameters

i	Filter index, in the range 0 to FilterFracs, inclusive.

Returns

Reference to the filter.

roundReqAtten()

static void r8b::CDSPFracDelayFilterBank::roundReqAtten ( double &  att, const bool  aIsThird  )

static

Function "rounds" the specified attenuation to the nearest effective value.

Parameters

[in,out]	att	Required filter attentuation. Will be rounded to the nearest value.
	aIsThird	"True" if one-third filter is required.

unref()

void r8b::CDSPFracDelayFilterBank::unref

(

)

This function should be called when the filter bank obtained via the filter bank cache is no longer needed.