IIR filters

Collaboration diagram for IIR filters:

Classes
class	SPUC::cutboost< Numeric, Coeff >
	IIR structure that can cut or boost signals at a programmed frequency. More...
class	SPUC::iir< Numeric, Coeff >
	Tempate Class for iir filter. More...
class	SPUC::iir_1st< Numeric, Coeff >
	Template Class for 1st Order iir filter. More...
class	SPUC::iir_2nd< Numeric, Coeff >
	Template for 2nd Order IIR filter. More...
class	SPUC::iir_allpass1< Numeric, Coeff >
	Template Class for IIR Filter using 2 1st order sections. More...
class	SPUC::iir_allpass1_cascade< Numeric, Coeff >
	Template Class for iir filter consisting of 1st order allpass sections. More...
class	SPUC::iir_allpass1_halfband< Numeric, Coeff >
	Template Class for Allpass halfband IIR Filter. More...
class	SPUC::iir_allpass2< Numeric, Coeff >
	Template Class for IIR filter using sum of 2nd Order Allpass sections. More...
class	SPUC::iir_coeff
	Class for iir filter design. More...
class	SPUC::iir_comb< Numeric, Coeff >
	Template for IIR comb type filter with programmable delay and gain. More...
class	SPUC::iir_delay_allpass1< Numeric, Coeff >
	Template Class for IIR filter consisting of 2 1st Order Allpass sections. More...
class	SPUC::iir_df< Numeric, Coeff >
	Template Class for Modeling a Direct Form IIR. More...
class	SPUC::iir_exp1< Numeric, Coeff >
	Template Class for 1st Order lowpass iir filter. More...
class	SPUC::iir_hpf< Numeric, Coeff >
	Template Class for 1st Order high pass IIR filter from S-domain transformation. More...
class	SPUC::iir_hpf1< Numeric, Coeff >
	Template Class for 1st Order High-pass iir filter. More...
class	SPUC::iir_lpf< Numeric, Coeff >
class	SPUC::iir_lpf1< Numeric, Coeff >
	Template Class for 1st Order lowpass iir filter. More...
class	SPUC::iir_shelf< Numeric, Coeff >
class	SPUC::notch_allpass< Numeric, Coeff >
	IIR notch filter based on 2nd order allpass structure. More...
class	SPUC::notch_iir< Numeric, Coeff >
	IIR notch filter based on 2nd order biquad. More...
Functions
void	SPUC::butterworth_allpass (smart_array< float_type > &a0, smart_array< float_type > &a1, int L)
	Calculate Allpass coefficients for halfband bireciprocal wave filter.
void	SPUC::butterworth_iir (iir_coeff &filt, float_type fcd, float_type amax)
	Calculate coefficients for IIR assuming butterworth frequency response.
void	SPUC::chebyshev_iir (iir_coeff &cheb, float_type fcd, float_type ripple)
	Calculate coefficients for IIR assuming chebyshev frequency response.
void	SPUC::elliptic_allpass (smart_array< float_type > a0, smart_array< float_type > a1, float_type fp, int L)
	Calculate Allpass coefficients for halfband bireciprocal wave filter.
void	SPUC::elliptic_iir (iir_coeff &filt, float_type fcd, float_type fstop, float_type stopattn, float_type ripple)
	Calculate coefficients for IIR assuming elliptic frequency response.

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Function Documentation

void SPUC::butterworth_allpass	(	smart_array< float_type > &	a0,
		smart_array< float_type > &	a1,
		int	L
	)

Calculate Allpass coefficients for halfband bireciprocal wave filter.

assuming butterworth frequency response

Author:

Tony Kirke

Tony Kirke, Copyright(c) 2001

void SPUC::butterworth_iir	(	iir_coeff &	filt,
		float_type	fcd,
		float_type	amax = 3.0
	)

Calculate coefficients for IIR assuming butterworth frequency response.

Constructor, fcd = cut-off (1=sampling rate) ord = Filter order amax = attenuation at cut-off

void SPUC::chebyshev_iir	(	iir_coeff &	cheb,
		float_type	fcd,
		float_type	ripple = 3.0
	)

Calculate coefficients for IIR assuming chebyshev frequency response.

fcd = cut-off (1=sampling rate) ord = Filter order ripple = passband ripple in dB

void SPUC::elliptic_allpass	(	smart_array< float_type >	a0,
		smart_array< float_type >	a1,
		float_type	fp,
		int	L
	)

Calculate Allpass coefficients for halfband bireciprocal wave filter.

assuming elliptic frequency response

Author:

Tony Kirke

Tony Kirke, Copyright(c) 2001

void SPUC::elliptic_iir	(	iir_coeff &	filt,
		float_type	fcd,
		float_type	fstop,
		float_type	stopattn,
		float_type	ripple
	)

Calculate coefficients for IIR assuming elliptic frequency response.

Author:

Tony Kirke, Copyright(c) 2001

Tony Kirke

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