filter.h File Reference

Infinite Impulse Response filter. More...

This graph shows which files directly or indirectly include this file:

Go to the source code of this file.

Typedefs
typedef _aubio_filter_t	aubio_filter_t
	IIR filter object.
Functions
void	aubio_filter_do (aubio_filter_t *b, fvec_t *in)
	filter input vector (in-place)
void	aubio_filter_do_outplace (aubio_filter_t *b, fvec_t *in, fvec_t *out)
	filter input vector (out-of-place)
void	aubio_filter_do_filtfilt (aubio_filter_t *b, fvec_t *in, fvec_t *tmp)
	filter input vector forward and backward
aubio_filter_t *	new_aubio_filter (uint_t samplerate, uint_t order)
	create new IIR filter
aubio_filter_t *	new_aubio_adsgn_filter (uint_t samplerate)
	create a new A-design filter
aubio_filter_t *	new_aubio_cdsgn_filter (uint_t samplerate)
	create a new C-design filter
void	del_aubio_filter (aubio_filter_t *f)
	delete a filter object

---

Detailed Description

Infinite Impulse Response filter.

This file implements IIR filters of any order:

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

---

Function Documentation

void aubio_filter_do	(	aubio_filter_t *	b,
		fvec_t *	in
	)

filter input vector (in-place)

Parameters:

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

void aubio_filter_do_filtfilt	(	aubio_filter_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 aubio_filter_do_outplace	(	aubio_filter_t *	b,
		fvec_t *	in,
		fvec_t *	out
	)

filter input vector (out-of-place)

Parameters:

	b	biquad object as returned by new_aubio_biquad
	in	input vector to filter
	out	output vector to store filtered input

void del_aubio_filter

(

aubio_filter_t *

f

)

delete a filter object

Parameters:

f

filter object to delete

aubio_filter_t* new_aubio_adsgn_filter

(

uint_t

samplerate

)

create a new A-design filter

Parameters:

samplerate

sampling-rate of the signal to filter

aubio_filter_t* new_aubio_cdsgn_filter

(

uint_t

samplerate

)

create a new C-design filter

Parameters:

samplerate

sampling-rate of the signal to filter

aubio_filter_t* new_aubio_filter	(	uint_t	samplerate,
		uint_t	order
	)

create new IIR filter

Parameters:

	samplerate	signal sampling rate
	order	order of the filter (number of coefficients)

---