avir::CDSPPeakedCosineLPF Class Reference

#include <avir.h>

Public Member Functions
	CDSPPeakedCosineLPF (const double aLen2, const double aFreq2, const double aAlpha)
template<class T >
void	generateLPF (T *op, const double DCGain)

Public Attributes
int	FilterLen
int	fl2

Detailed Description

Low-pass filter windowed by Peaked Cosine window function.

This class implements calculation of linear-phase symmetric-odd FIR low-pass filter windowed by the Peaked Cosine window function, for image processing applications.

Constructor & Destructor Documentation

avir::CDSPPeakedCosineLPF::CDSPPeakedCosineLPF	(	const double	aLen2,
		const double	aFreq2,
		const double	aAlpha
	)

Constructor initalizes *this object.

Parameters

aLen2	Half-length (non-truncated) of low-pass filter, in samples (taps).
aFreq2	Low-pass filter's corner frequency [0; pi].
aAlpha	Peaked Cosine window function Alpha parameter.

Member Function Documentation

template<class T >

void avir::CDSPPeakedCosineLPF::generateLPF	(	T *	op,
		const double	DCGain
	)

Function generates a linear-phase low-pass filter windowed by Peaked Cosine window function.

Parameters

[out]	op	Output buffer, length = FilterLen (fl2 * 2 + 1).
	DCGain	Required gain at DC. The resulting filter will be normalized to achieve this DC gain. If non-positive, no automatic normalization will be performed.

Member Data Documentation

int avir::CDSPPeakedCosineLPF::FilterLen

Filter's length in samples (taps).

int avir::CDSPPeakedCosineLPF::fl2

Half filter's length, excluding the peak value. This value can be also used as filter's latency in samples (taps).