Two poles filter

Typedefs
typedef struct SDTTwoPoles	SDTTwoPoles
	Opaque data structure for a two poles filter object.
typedef struct SDTTwoPoles	SDTTwoPoles
	Opaque data structure for a two poles filter object.

Functions
SDTTwoPoles *	SDTTwoPoles_new ()
	Object constructor. More...
void	SDTTwoPoles_free (SDTTwoPoles *x)
	Object destructor. More...
void	SDTTwoPoles_lowpass (SDTTwoPoles *x, double fc)
	Puts the filter in lowpass mode, at the given cutoff frequency. More...
void	SDTTwoPoles_highpass (SDTTwoPoles *x, double fc)
	Puts the filter in highpass mode, at the given cutoff frequency. More...
void	SDTTwoPoles_resonant (SDTTwoPoles *x, double fc, double q)
	Puts the filter in resonant bandpass mode, at the given center frequency and Q. More...
double	SDTTwoPoles_dsp (SDTTwoPoles *x, double in)
	Signal processing routine. Call this function at sample rate to compute the filtered signal. More...

Detailed Description

Two poles filter, configurable as lowpass, highpass or resonant bandpass.

Function Documentation

double SDTTwoPoles_dsp	(	SDTTwoPoles *	x,
		double	in
	)

Signal processing routine. Call this function at sample rate to compute the filtered signal.

Parameters

[in]

in

Input sample

Returns

Output sample

void SDTTwoPoles_free

(

SDTTwoPoles *

x

)

Object destructor.

Parameters

[in]

x

Pointer to the instance to destroy

void SDTTwoPoles_highpass	(	SDTTwoPoles *	x,
		double	fc
	)

Puts the filter in highpass mode, at the given cutoff frequency.

Parameters

[in]

fc

Cutoff frequency, in Hz

void SDTTwoPoles_lowpass	(	SDTTwoPoles *	x,
		double	fc
	)

Puts the filter in lowpass mode, at the given cutoff frequency.

Parameters

[in]

fc

Cutoff frequency, in Hz

SDTTwoPoles * SDTTwoPoles_new

(

)

Object constructor.

Returns

Pointer to the new instance

void SDTTwoPoles_resonant	(	SDTTwoPoles *	x,
		double	fc,
		double	q
	)

Puts the filter in resonant bandpass mode, at the given center frequency and Q.

Parameters

[in]	fc	Center frequency, in Hz
[in]	q	Q factor, in 1/octave