biquad.h File Reference

Second order Infinite Impulse Response filter. More...

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Typedefs
typedef _aubio_biquad_t	aubio_biquad_t
	biquad filter object
Functions
void	aubio_biquad_do (aubio_biquad_t *b, fvec_t *in)
	filter input vector
void	aubio_biquad_do_filtfilt (aubio_biquad_t *b, fvec_t *in, fvec_t *tmp)
	filter input vector forward and backward
aubio_biquad_t *	new_aubio_biquad (lsmp_t b1, lsmp_t b2, lsmp_t b3, lsmp_t a2, lsmp_t a3)
	create new biquad filter
void	del_aubio_biquad (aubio_biquad_t *b)
	delete biquad filter

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Detailed Description

Second order Infinite Impulse Response filter.

This file implements a normalised biquad filter (second order IIR):

The filtfilt version runs the filter twice, forward and backward, to compensate the phase shifting of the forward operation.

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Function Documentation

void aubio_biquad_do	(	aubio_biquad_t *	b,
		fvec_t *	in
	)

filter input vector

Parameters:

	b	biquad object as returned by new_aubio_biquad
	in	input vector to filter

void aubio_biquad_do_filtfilt	(	aubio_biquad_t *	b,
		fvec_t *	in,
		fvec_t *	tmp
	)

filter input vector forward and backward

Parameters:

	b	biquad object as returned by new_aubio_biquad
	in	input vector to filter
	tmp	memory space to use for computation

void del_aubio_biquad

(

aubio_biquad_t *

b

)

delete biquad filter

Parameters:

b

biquad object to delete

aubio_biquad_t* new_aubio_biquad	(	lsmp_t	b1,
		lsmp_t	b2,
		lsmp_t	b3,
		lsmp_t	a2,
		lsmp_t	a3
	)

create new biquad filter

Parameters:

	b1	forward filter coefficient
	b2	forward filter coefficient
	b3	forward filter coefficient
	a2	feedback filter coefficient
	a3	feedback filter coefficient

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