filter.h File Reference

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Macros
#define	LP   0x00010000 /* Low pass */
#define	HP   0x00020000 /* High pass */
#define	BP   0x00040000 /* Band pass */
#define	BS   0x00080000 /* Band stop */
#define	TYPE_MASK   0x000F0000
#define	BOXCAR   0x00000001
#define	TRIANG   0x00000002
#define	HAMMING   0x00000004
#define	HANNING   0x00000008
#define	BLACKMAN   0x00000010
#define	FLATTOP   0x00000011
#define	KAISER   0x00000012
#define	WINDOW_MASK   0x0000001F
#define	FWD   0x00000001 /* Forward indexing of polyphase filter */
#define	REW   0x00000002 /* Reverse indexing of polyphase filter */
#define	ODD   0x00000010 /* Make filter HP */
#define	updateq(n, xi, xq, in)

Functions
_ftype_t	fir (unsigned int n, _ftype_t *w, _ftype_t *x)
_ftype_t *	pfir (unsigned int n, unsigned int k, unsigned int xi, _ftype_t **w, _ftype_t **x, _ftype_t *y, unsigned int s)
int	updateq (unsigned int n, unsigned int xi, _ftype_t *xq, _ftype_t *in)
int	updatepq (unsigned int n, unsigned int k, unsigned int xi, _ftype_t **xq, _ftype_t *in, unsigned int s)
int	design_fir (unsigned int n, _ftype_t *w, _ftype_t *fc, unsigned int flags, _ftype_t opt)
int	design_pfir (unsigned int n, unsigned int k, _ftype_t *w, _ftype_t **pw, _ftype_t g, unsigned int flags)
void	prewarp (_ftype_t *a, _ftype_t fc, _ftype_t fs)
void	bilinear (_ftype_t *a, _ftype_t *b, _ftype_t *k, _ftype_t fs, _ftype_t *coef)
int	szxform (const _ftype_t *a, const _ftype_t *b, _ftype_t Q, _ftype_t fc, _ftype_t fs, _ftype_t *k, _ftype_t *coef)

Macro Definition Documentation

BLACKMAN

#define BLACKMAN   0x00000010

BOXCAR

#define BOXCAR   0x00000001

BP

#define BP   0x00040000 /* Band pass */

BS

#define BS   0x00080000 /* Band stop */

FLATTOP

#define FLATTOP   0x00000011

FWD

#define FWD   0x00000001 /* Forward indexing of polyphase filter */

HAMMING

#define HAMMING   0x00000004

HANNING

#define HANNING   0x00000008

HP

#define HP   0x00020000 /* High pass */

KAISER

#define KAISER   0x00000012

LP

#define LP   0x00010000 /* Low pass */

ODD

#define ODD   0x00000010 /* Make filter HP */

REW

#define REW   0x00000002 /* Reverse indexing of polyphase filter */

TRIANG

#define TRIANG   0x00000002

TYPE_MASK

#define TYPE_MASK   0x000F0000

updateq

#define updateq	(		n,
			xi,
			xq,
			in
	)

Value:

  xq[xi]=(xq)[(xi)+(n)]=*(in);\
  xi=(++(xi))&((n)-1);

WINDOW_MASK

#define WINDOW_MASK   0x0000001F

Function Documentation

bilinear()

void bilinear	(	_ftype_t *	a,
		_ftype_t *	b,
		_ftype_t *	k,
		_ftype_t	fs,
		_ftype_t *	coef
	)

design_fir()

int design_fir	(	unsigned int	n,
		_ftype_t *	w,
		_ftype_t *	fc,
		unsigned int	flags,
		_ftype_t	opt
	)

design_pfir()

int design_pfir	(	unsigned int	n,
		unsigned int	k,
		_ftype_t *	w,
		_ftype_t **	pw,
		_ftype_t	g,
		unsigned int	flags
	)

fir()

_ftype_t fir	(	unsigned int	n,
		_ftype_t *	w,
		_ftype_t *	x
	)

pfir()

_ftype_t* pfir	(	unsigned int	n,
		unsigned int	k,
		unsigned int	xi,
		_ftype_t **	w,
		_ftype_t **	x,
		_ftype_t *	y,
		unsigned int	s
	)

prewarp()

void prewarp	(	_ftype_t *	a,
		_ftype_t	fc,
		_ftype_t	fs
	)

szxform()

int szxform	(	const _ftype_t *	a,
		const _ftype_t *	b,
		_ftype_t	Q,
		_ftype_t	fc,
		_ftype_t	fs,
		_ftype_t *	k,
		_ftype_t *	coef
	)

updatepq()

int updatepq	(	unsigned int	n,
		unsigned int	k,
		unsigned int	xi,
		_ftype_t **	xq,
		_ftype_t *	in,
		unsigned int	s
	)

updateq()

int updateq	(	unsigned int	n,
		unsigned int	xi,
		_ftype_t *	xq,
		_ftype_t *	in
	)