Phase vocoder object. More...
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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 More... | |
void | del_aubio_pvoc (aubio_pvoc_t *pv) |
delete phase vocoder object More... | |
void | aubio_pvoc_do (aubio_pvoc_t *pv, fvec_t *in, cvec_t *fftgrain) |
compute spectral frame More... | |
void | aubio_pvoc_rdo (aubio_pvoc_t *pv, cvec_t *fftgrain, fvec_t *out) |
compute signal from spectral frame More... | |
uint_t | aubio_pvoc_get_win (aubio_pvoc_t *pv) |
get window size More... | |
uint_t | aubio_pvoc_get_hop (aubio_pvoc_t *pv) |
get hop size More... | |
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.
void aubio_pvoc_do | ( | aubio_pvoc_t * | pv, |
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.
pv | phase vocoder object as returned by new_aubio_pvoc |
in | new input signal (hop_s long) |
fftgrain | output spectral frame |
uint_t aubio_pvoc_get_hop | ( | aubio_pvoc_t * | pv | ) |
get hop size
pv | phase vocoder to get the hop size from |
uint_t aubio_pvoc_get_win | ( | aubio_pvoc_t * | pv | ) |
get window size
pv | phase vocoder to get the window size from |
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.
pv | phase vocoder object as returned by new_aubio_pvoc |
fftgrain | input spectral frame |
out | output signal (hop_s long) |
void del_aubio_pvoc | ( | aubio_pvoc_t * | pv | ) |
delete phase vocoder object
pv | phase vocoder object as returned by new_aubio_pvoc |
aubio_pvoc_t* new_aubio_pvoc | ( | uint_t | win_s, |
uint_t | hop_s | ||
) |
create phase vocoder object
win_s | size of analysis buffer (and length the FFT transform) |
hop_s | step size between two consecutive analysis |