csl::Butter Class Reference

#include <Filters.h>

Inheritance diagram for csl::Butter:

List of all members.

Public Member Functions
	Butter ()
	Butter (ButterworthType type, float cutoff)
	Butter (ButterworthType type, float center, float bandwidth)
	Butter (UnitGenerator &in, ButterworthType type, float cutoff)
	Butter (UnitGenerator &in, ButterworthType type, UnitGenerator &cutoff)
	Butter (UnitGenerator &in, ButterworthType type, float center, float bandwidth)
	Butter (UnitGenerator &in, ButterworthType type, UnitGenerator &center, UnitGenerator &bandwidth)
void	setupCoeffs ()
Protected Attributes
int	mFilterType

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Detailed Description

Butterworth IIR (2nd order recursive) filter. This operates upon a buffer of frames of amplitude samples by applying the following equation y(n) = a0*x(n) + a1*x(n-1) + a2*x(n-2) - b1*y(n-1) - b2*y(n-2) where x is an amplitude sample. It has constructors that can calculate the coefficients from a given cutoff frequency.

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Constructor & Destructor Documentation

Butter::Butter

(

)

Butterworth IIR (2nd order recursive) filter. This operates upon a buffer of frames of amplitude samples by applying the following equation y(n) = a0*x(n) + a1*x(n-1) + a2*x(n-2) - b1*y(n-1) - b2*y(n-2) where x is an amplitude sample. It has constructors that can calculate the coefficients from a given cutoff frequency.

Butter::Butter	(	ButterworthType	type,
		float	cutoff
	)

References csl::Filter::clear(), mFilterType, csl::FrequencyAmount::setAmount(), csl::FrequencyAmount::setFrequency(), and setupCoeffs().

Butter::Butter	(	ButterworthType	type,
		float	center,
		float	bandwidth
	)

References csl::Filter::clear(), mFilterType, csl::FrequencyAmount::setAmount(), csl::FrequencyAmount::setFrequency(), and setupCoeffs().

Butter::Butter	(	UnitGenerator &	in,
		ButterworthType	type,
		float	cutoff
	)

References csl::Filter::clear(), mFilterType, csl::FrequencyAmount::setAmount(), csl::FrequencyAmount::setFrequency(), and setupCoeffs().

Butter::Butter	(	UnitGenerator &	in,
		ButterworthType	type,
		UnitGenerator &	cutoff
	)

References csl::Filter::clear(), mFilterType, csl::FrequencyAmount::setAmount(), csl::FrequencyAmount::setFrequency(), and setupCoeffs().

Butter::Butter	(	UnitGenerator &	in,
		ButterworthType	type,
		float	center,
		float	bandwidth
	)

References csl::Filter::clear(), mFilterType, csl::FrequencyAmount::setAmount(), csl::FrequencyAmount::setFrequency(), and setupCoeffs().

Butter::Butter	(	UnitGenerator &	in,
		ButterworthType	type,
		UnitGenerator &	center,
		UnitGenerator &	bandwidth
	)

References csl::Filter::clear(), mFilterType, csl::FrequencyAmount::setAmount(), csl::FrequencyAmount::setFrequency(), and setupCoeffs().

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Member Function Documentation

void Butter::setupCoeffs

(

)

[virtual]

Reimplemented from csl::Filter.

References BW_BAND_PASS, BW_BAND_STOP, BW_HIGH_PASS, BW_LOW_PASS, CSL_FILTER_AMOUNT, CSL_FILTER_FREQUENCY, CSL_PI, CSL_SQRT_TWO, csl::Filter::mACoeff, csl::Filter::mBCoeff, mFilterType, csl::UnitGenerator::mFrameRate, and csl::Controllable::mInputs.

Referenced by Butter().

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Member Data Documentation

int csl::Butter::mFilterType [protected]

Referenced by Butter(), and setupCoeffs().

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

• CSL/Processors/Filters.h
• CSL/Processors/Filters.cpp