Phase vocoder object. More...

Typedefs
typedef struct _aubio_pvoc_t	aubio_pvoc_t
	phasevocoder object

Functions
aubio_pvoc_t *	new_aubio_pvoc (uint_t win_s, uint_t hop_s)
	create phase vocoder object
void	del_aubio_pvoc (aubio_pvoc_t *pv)
	delete phase vocoder object
void	aubio_pvoc_do (aubio_pvoc_t pv, const fvec_t in, cvec_t *fftgrain)
	compute spectral frame
void	aubio_pvoc_rdo (aubio_pvoc_t pv, cvec_t fftgrain, fvec_t *out)
	compute signal from spectral frame
uint_t	aubio_pvoc_get_win (aubio_pvoc_t *pv)
	get window size
uint_t	aubio_pvoc_get_hop (aubio_pvoc_t *pv)
	get hop size
uint_t	aubio_pvoc_set_window (aubio_pvoc_t pv, const char_t window_type)
	set window type

Detailed Description

Phase vocoder object.

This object implements a phase vocoder. The spectral frames are computed using a HanningZ window and a swapped version of the signal to simplify the phase relationships across frames. The window sizes and overlap are specified at creation time.

Definition in file phasevoc.h.

Typedef Documentation

◆ aubio_pvoc_t

typedef struct _aubio_pvoc_t aubio_pvoc_t

phasevocoder object

Examples: spectral/test-mfcc.c, spectral/test-phasevoc.c, and spectral/test-tss.c.

Definition at line 42 of file phasevoc.h.

Function Documentation

◆ aubio_pvoc_do()

void aubio_pvoc_do	(	aubio_pvoc_t *	pv,
		const fvec_t *	in,
		cvec_t *	fftgrain )

compute spectral frame

This function accepts an input vector of size [hop_s]. The analysis buffer is rotated and filled with the new data. After windowing of this signal window, the Fourier transform is computed and returned in fftgrain as two vectors, magnitude and phase.

Parameters

pv	phase vocoder object as returned by new_aubio_pvoc
in	new input signal (hop_s long)
fftgrain	output spectral frame

Examples: spectral/test-mfcc.c, spectral/test-phasevoc.c, and spectral/test-tss.c.

References aubio_pvoc_do().

Referenced by aubio_pvoc_do().

◆ aubio_pvoc_get_hop()

uint_t aubio_pvoc_get_hop ( aubio_pvoc_t * pv )

get hop size

Parameters

pv	phase vocoder to get the hop size from

Examples: spectral/test-phasevoc.c.

References aubio_pvoc_get_hop().

Referenced by aubio_pvoc_get_hop().

◆ aubio_pvoc_get_win()

uint_t aubio_pvoc_get_win ( aubio_pvoc_t * pv )

get window size

Parameters

pv	phase vocoder to get the window size from

Examples: spectral/test-phasevoc.c.

References aubio_pvoc_get_win().

Referenced by aubio_pvoc_get_win().

◆ aubio_pvoc_rdo()

void aubio_pvoc_rdo	(	aubio_pvoc_t *	pv,
		cvec_t *	fftgrain,
		fvec_t *	out )

compute signal from spectral frame

This function takes an input spectral frame fftgrain of size [buf_s] and computes its inverse Fourier transform. Overlap-add synthesis is then computed using the previously synthetised frames, and the output stored in out.

Parameters