avir::CDSPPeakedCosineLPF Class Reference

Low-pass filter windowed by Peaked Cosine window function. More...

#include <avir.h>

Public Member Functions
	CDSPPeakedCosineLPF (const double aLen2, const double aFreq2, const double aAlpha)
	Initalizes this object.
template<typename T>
void	generateLPF (T *op, const double DCGain)
	Generates a linear-phase low-pass filter windowed by Peaked Cosine window function.

Public Attributes
int	FilterLen
	Filter's length in samples (taps).
int	fl2
	Half filter's length, excluding the peak value. This value can be also used as filter's latency in samples (taps).

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

CDSPPeakedCosineLPF()

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

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

generateLPF()

template<typename T>

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

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

Parameters

[out]	op	Output buffer, length equals 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.

Template Parameters

T	Filter coefficients' type.