dct.h File Reference

Discrete Cosine Transform. More...

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Typedefs
typedef struct _aubio_dct_t	aubio_dct_t
	DCT object.

Functions
aubio_dct_t *	new_aubio_dct (uint_t size)
	create new DCT computation object
void	aubio_dct_do (aubio_dct_t *s, const fvec_t *input, fvec_t *dct_output)
	compute forward DCT
void	aubio_dct_rdo (aubio_dct_t *s, const fvec_t *input, fvec_t *idct_output)
	compute backward DCT
void	del_aubio_dct (aubio_dct_t *s)
	delete DCT object

Detailed Description

Discrete Cosine Transform.

Functions aubio_dct_do() and aubio_dct_rdo() are equivalent to MATLAB/Octave dct() and idct() functions, as well as scipy.fftpack.dct(x, norm='ortho') and scipy.fftpack.idct(x, norm='ortho')

Definition in file dct.h.

Typedef Documentation

aubio_dct_t

typedef struct _aubio_dct_t aubio_dct_t

DCT object.

This object computes forward and backward DCT type 2 with orthonormal scaling.

Examples

spectral/test-dct.c.

Definition at line 46 of file dct.h.

Function Documentation

aubio_dct_do()

void aubio_dct_do	(	aubio_dct_t *	s,
		const fvec_t *	input,
		fvec_t *	dct_output )

compute forward DCT

Parameters

s	dct object as returned by new_aubio_dct
input	input signal
dct_output	transformed input array

Examples

spectral/test-dct.c.

References aubio_dct_do().

Referenced by aubio_dct_do().

aubio_dct_rdo()

void aubio_dct_rdo	(	aubio_dct_t *	s,
		const fvec_t *	input,
		fvec_t *	idct_output )

compute backward DCT

Parameters

s	dct object as returned by new_aubio_dct
input	input signal
idct_output	transformed input array

Examples

spectral/test-dct.c.

References aubio_dct_rdo().

Referenced by aubio_dct_rdo().

del_aubio_dct()

void del_aubio_dct

(

aubio_dct_t *

s

)

delete DCT object

Parameters

s	dct object as returned by new_aubio_dct

Examples

spectral/test-dct.c.

References del_aubio_dct().

Referenced by del_aubio_dct().

new_aubio_dct()

aubio_dct_t * new_aubio_dct

(

uint_t

size

)

create new DCT computation object

Parameters

size	length of the DCT

Examples

spectral/test-dct.c.

References new_aubio_dct().

Referenced by new_aubio_dct().