Iir::Biquad Class Reference

Inheritance diagram for Iir::Biquad:

Public Member Functions
complex_t	response (double normalizedFrequency) const
std::vector< PoleZeroPair >	getPoleZeros () const
double	getA0 () const
double	getA1 () const
double	getA2 () const
double	getB0 () const
double	getB1 () const
double	getB2 () const
template<class StateType>
double	filter (double s, StateType &state) const
void	setCoefficients (double a0, double a1, double a2, double b0, double b1, double b2)
void	setOnePole (complex_t pole, complex_t zero)
void	setTwoPole (complex_t pole1, complex_t zero1, complex_t pole2, complex_t zero2)
void	setPoleZeroPair (const PoleZeroPair &pair)
void	setIdentity ()
void	applyScale (double scale)

Member Function Documentation

applyScale()

void Iir::Biquad::applyScale

(

double

scale

)

Performs scaling operation on the FIR coefficients

Parameters

scale

Mulitplies the coefficients b0,b1,b2 with the scaling factor scale.

filter()

template<class StateType>

double Iir::Biquad::filter ( double s, StateType & state ) const

inline

Filter a sample with the coefficients provided here and the State provided as an argument.

Parameters

s	The sample to be filtered.
state	The Delay lines (instance of a state from State.h)

Returns

The filtered sample.

getA0()

double Iir::Biquad::getA0 ( ) const

inline

Returns 1st IIR coefficient (usually one)

getA1()

double Iir::Biquad::getA1 ( ) const

inline

Returns 2nd IIR coefficient

getA2()

double Iir::Biquad::getA2 ( ) const

inline

Returns 3rd IIR coefficient

getB0()

double Iir::Biquad::getB0 ( ) const

inline

Returns 1st FIR coefficient

getB1()

double Iir::Biquad::getB1 ( ) const

inline

Returns 2nd FIR coefficient

getB2()

double Iir::Biquad::getB2 ( ) const

inline

Returns 3rd FIR coefficient

getPoleZeros()

std::vector< PoleZeroPair > Iir::Biquad::getPoleZeros

(

)

const

Returns the pole / zero Pairs as a vector.

response()

complex_t Iir::Biquad::response

(

double

normalizedFrequency

)

const

Calculate filter response at the given normalized frequency and return the complex response.

Gets the frequency response of the Biquad

Parameters

normalizedFrequency

Normalised frequency (0 to 0.5)

setCoefficients()

void Iir::Biquad::setCoefficients	(	double	a0,
		double	a1,
		double	a2,
		double	b0,
		double	b1,
		double	b2 )

Sets all coefficients

Parameters

a0	1st IIR coefficient
a1	2nd IIR coefficient
a2	3rd IIR coefficient
b0	1st FIR coefficient
b1	2nd FIR coefficient
b2	3rd FIR coefficient

setIdentity()

void Iir::Biquad::setIdentity

(

)

Sets the coefficiens as pass through. (b0=1,a0=1, rest zero)

setOnePole()

void Iir::Biquad::setOnePole	(	complex_t	pole,
		complex_t	zero )

Sets one (real) pole and zero. Throws exception if imaginary components.

setPoleZeroPair()

void Iir::Biquad::setPoleZeroPair ( const PoleZeroPair & pair )

inline

Sets a complex conjugate pair

setTwoPole()

void Iir::Biquad::setTwoPole	(	complex_t	pole1,
		complex_t	zero1,
		complex_t	pole2,
		complex_t	zero2 )

Sets two poles/zoes as a pair. Needs to be complex conjugate.

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

• iir/Biquad.h
• iir/Biquad.cpp