dsp::biquad_d1 Struct Reference

#include <biquad.h>

Inheritance diagram for dsp::biquad_d1:

Public Member Functions
	biquad_d1 ()
	Constructor (initializes state to all zeros).
double	process (double in)
	direct I form with four state variables
double	process_zeroin ()
	direct I form with zero input
double	process_lp (double in)
	simplified version for lowpass case with two zeros at -1
double	process_hp (double in)
	simplified version for highpass case with two zeros at 1
void	sanitize ()
	Sanitize (set to 0 if potentially denormal) filter state.
void	reset ()
	Reset state variables.
bool	empty () const
Public Member Functions inherited from dsp::biquad_coeffs
	biquad_coeffs ()
void	set_null ()
void	set_lp_rbj (float fc, float q, float sr, float gain=1.0)
void	set_lp_zoelzer (float fc, float q, float odsr, float gain=1.0)
void	set_hp_rbj (float fc, float q, float esr, float gain=1.0)
void	set_hp_rbj_optimized (float fc, float q, float esr, float gain=1.0)
void	set_bp_rbj (double fc, double q, double esr, double gain=1.0)
void	set_br_rbj (double fc, double q, double esr, double gain=1.0)
void	set_allpass (float freq, float pole_r, float sr)
void	set_bilinear (double aa0, double aa1, double aa2, double ab0, double ab1, double ab2)
	set digital filter parameters based on given analog filter parameters
void	set_bilinear_direct (double aa0, double aa1, double aa2, double ab1, double ab2)
	set digital filter parameters directly
void	set_peakeq_rbj (double freq, double q, double peak, double sr)
void	set_lowshelf_rbj (float freq, float q, float peak, float sr)
void	set_highshelf_rbj (float freq, float q, float peak, float sr)
void	copy_coeffs (const biquad_coeffs &src)
	copy coefficients from another biquad
float	freq_gain (float freq, float sr) const
cfloat	h_z (const cfloat &z) const

Public Attributes
double	x1
	input[n-1]
double	x2
	input[n-2]
double	y1
	output[n-1]
double	y2
	output[n-2]
Public Attributes inherited from dsp::biquad_coeffs
double	a0
double	a1
double	a2
double	b1
double	b2

Additional Inherited Members
Public Types inherited from dsp::biquad_coeffs
typedef std::complex< double >	cfloat
Static Public Member Functions inherited from dsp::biquad_coeffs
static double	prewarp (float freq, float sr)
	prewarping for bilinear transform, maps given digital frequency to analog counterpart for analog filter design
static double	unwarp (float omega, float sr)
	convert analog angular frequency value to digital
static double	unwarpf (float t, float sr)
	convert analog filter time constant to digital counterpart

Detailed Description

Two-pole two-zero filter, for floating point values. Uses "traditional" Direct I form (separate FIR and IIR halves). don't use this for integers because it won't work

Constructor & Destructor Documentation

biquad_d1()

dsp::biquad_d1::biquad_d1 ( )

inline

Constructor (initializes state to all zeros).

Member Function Documentation

empty()

bool dsp::biquad_d1::empty ( ) const

inline

process()

double dsp::biquad_d1::process ( double in )

inline

direct I form with four state variables

process_hp()

double dsp::biquad_d1::process_hp ( double in )

inline

simplified version for highpass case with two zeros at 1

process_lp()

double dsp::biquad_d1::process_lp ( double in )

inline

simplified version for lowpass case with two zeros at -1

process_zeroin()

double dsp::biquad_d1::process_zeroin ( )

inline

direct I form with zero input

reset()

void dsp::biquad_d1::reset ( )

inline

Reset state variables.

sanitize()

void dsp::biquad_d1::sanitize ( )

inline

Sanitize (set to 0 if potentially denormal) filter state.

Member Data Documentation

x1

double dsp::biquad_d1::x1

input[n-1]

x2

double dsp::biquad_d1::x2

input[n-2]

y1

double dsp::biquad_d1::y1

output[n-1]

y2

double dsp::biquad_d1::y2

output[n-2]

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The documentation for this struct was generated from the following file:

• /home/runner/work/lmms-fork/lmms-fork/plugins/LadspaEffect/calf/veal/src/calf/biquad.h